the first embodiment of the present invention will be described with reference to fig1 to 4 . fig1 is a diagram of a medical treatment device ( medical treatment system ) 1 according to the present embodiment . as illustrated in fig1 , the medical treatment device 1 includes a medical treatment tool ( hand - piece ) 2 . the medical treatment tool 2 has a longitudinal axis c . in this example , a first side in the direction of the longitudinal axis c is on a head side near the head of the medical treatment tool 2 ( a side of an arrow c 1 in fig1 ), and the side opposite to the side near the head is on a base side near the base of the medical treatment tool 2 ( a side of an arrow c 2 in fig1 ). the medical treatment tool 2 is detachably connected to a control device 3 through a cable 5 . the control device 3 is an energy control device , for example , that controls the supply of energy used for treatment to ( treatment energy ) to the medical treatment tool 2 . the medical treatment tool 2 includes a housing 6 including a head and a base . the housing 6 includes a housing body 7 extending along the longitudinal axis c , and a grip ( fixed handle ) 8 extending from the housing body 7 in the direction crossing the longitudinal axis c . a first end of the cable 5 is connected to the base portion of the housing body 7 . a handle ( movable handle ) 11 is rotatably attached to the housing 6 . the handle 11 rotates around an attachment position at which the handle 11 is attached to the housing 6 . this rotation allows the handle 11 to open and close with respect to the grip 8 of the housing 6 ( displaces the handle 11 ). in the present embodiment , the handle 11 is positioned on a head side near the head of the grip 8 so that the handle 11 opens and closes with respect to the grip 8 ( moves from and toward the grip 8 ) in roughly parallel to the longitudinal axis c . a rotating knob 12 is coupled to the head side of the housing body 7 . the rotating knob 12 is rotatable around the longitudinal axis c of the housing 6 . a sheath 13 is coupled to the housing 6 while being inserted from the head side into the rotating knob 12 and housing body 7 . an extension member ( probe ) 15 extends from the inside of the housing body 7 through the inside of the sheath 13 toward the head side . the head of the extension member 15 is provided with a first grasp unit ( treatment probe ) 16 . the extension member 15 is inserted into and penetrates the sheath 13 . the first grasp unit 16 protrudes from the head of the sheath 13 toward the head side . in the present embodiment , the extension member 15 is made of a material having high vibration transferability and thus capable of transferring ultrasonic vibration . a second grasp unit ( jaw ) 17 is rotatably attached to the head of the sheath 13 . the handle 11 opens or closes with respect to the grip 8 . this moves a movable pipe ( not illustrated ) extending between the sheath 13 and the extension member 15 along the longitudinal axis c . this rotates the second grasp unit 17 so that the second grasp unit 17 opens or closes with respect to the first grasp unit 16 . in the present embodiment , the first grasp unit 16 and the second grasp unit 17 form an end effector 18 that treats an object to be treated such as body tissue . the end effector 18 grasps the object to be treated between a pair of the grasp units 16 and 17 so as to treat the object to be treated . fig2 is an explanatory diagram of an electrical connection between the medical treatment tool 2 and the control device 3 , and a path of supply of energy used for treatment to the end effector 18 . as illustrated in fig1 and 2 , a vibration generation unit 21 extends in the housing body 7 along the longitudinal axis c . the vibration generation unit 21 is connected to a base side near the base of the extension member 15 in the housing body 7 . the vibration generation unit 21 is provided with a piezoelectric device ( not illustrated ) that converts electrical energy ( alternating current ) into ultrasonic vibration . the control device 3 includes one or more processors such as an energy source 25 that generates energy for treatment , and a control unit 26 that controls the energy source 25 . the energy source 25 includes , for example , a drive circuit ( not illustrated ) that converts direct current power from a battery or electricity from an outlet into electrical energy used for treatment . the control unit 26 includes , for example , a processor or an integrated circuit including a central processing unit ( cpu ) or an application specific integrated circuit ( asic ), and a storage medium such as a memory so as to control the whole medical treatment device 1 . note that , in the control unit 26 , for example , a processor can work as a level setting unit 27 configured to set a level ( energy level ) on each type of energy output from the energy source 25 , or can work as a measurement unit 28 ( a measurement circuit ) that can measure a predetermined parameter . the level setting unit 27 and measurement unit 28 perform some of processes that , for example , the processor performs . the control device 3 is provided also with an alarm 29 electrically connected to the control unit 26 . the alarm 29 is , for example , a bell that warns by generating a sound , a lamp that warns by producing light , or a display screen that displays warning . in this example , the alarm 29 is not necessarily placed in the control device 3 , and can be placed , for example , in the housing 6 of the medical treatment tool 2 . alternatively , warning can be displayed on the display screen of an endoscope ( not illustrated ) used together with the medical treatment device 1 . first ends of electrical lines 22 a and 22 b are connected to the vibration generation unit 21 . the electrical lines ( energy lines ) 22 a and 22 b extend through the insides of the housing 6 , cable 5 , and control device 3 . second ends of the electrical lines 22 a and 22 b are connected to the energy source 25 . the control by the control unit 26 outputs the electrical energy ( alternating current power ) that is to be converted into ultrasonic vibration from the energy source 25 through the electrical lines 22 a and 22 b , and the electrical energy output through the electrical lines 22 a and 22 b is supplied to the vibration generation unit 21 . the supply of the electrical energy to the vibration generation unit 21 generates ultrasonic vibration . then , the generated ultrasonic vibration is transmitted to the extension member 15 . the ultrasonic vibration is transmitted from the base side to head side of the extension member 15 . subsequently , the ultrasonic vibration is transmitted to the first grasp unit 16 of the end effector 18 . first ends of energy lines 23 a and 23 b are also connected to the energy source 25 . the energy line 23 a extends through the insides of the control device 3 , cable 5 , and housing 6 . a second end of the energy line 23 a is connected to the first grasp unit 16 . the energy line 23 b extends through the insides of the cable 5 , and housing 6 . a second end of the energy line 23 b is connected to the second grasp unit 17 . the control by the control unit 26 outputs high frequency energy ( high frequency electricity ) from the energy source 25 through the energy lines 23 a and 23 b . then , the high frequency energy is supplied through the energy line 23 a to the first grasp unit 16 and through the energy line 23 b to the second grasp unit 17 . the supply of the high frequency energy to the end effector 18 ( the first grasp unit 16 and second grasp unit 17 ) causes the first grasp unit 16 and second grasp unit 17 to function as electrodes of the high frequency energies with different electrical potentials each other . as illustrated in fig1 , operation buttons 31 a and 31 b are attached as operation members to the housing 6 . in the present embodiment , the operation buttons 31 a and 31 b are attached to a surface of a head 32 of the grip 8 , and placed at a portion of the head side of the housing 6 . the operation buttons 31 a and 31 b are placed on the side on which the grip 8 is positioned when the longitudinal axis c is centered , and placed nearer to the longitudinal axis c than a force application unit ( handle finger - put position ) 33 to which operation force is applied by operation for opening or closing the handle 11 with respect to the housing 6 . with each of the operation buttons 31 a and 31 b , operation for causing the medical treatment device 1 to function ( for example , to supply energy to the end effector 18 ) is input . in the present embodiment , the operation buttons 31 a and 31 b are momentary operation members and thus each of the operation buttons 31 a and 31 b is in the on state only while the operation is input ( only while the button is pressed ). thus , when the input of operation ( pressing the button ) is released , the operation buttons 31 a and 31 b is turned into an off state . as illustrated in fig2 , the inside of the housing 6 ( the inside of the grip 8 ) is provided with switches 35 a and 35 b . each of the switches 35 a and 35 b is switched between an opening state and a closing state in accordance with the operating state ( namely , the on state or off state ) input with the operation button ( one of 31 a and 31 b ) corresponding to each of the switches 35 a and 35 b . first ends of the detection signal lines ( first detection signal lines ) 36 a 1 and 36 a 2 are connected to the switch 35 a . the detection signal lines 36 a 1 and 36 a 2 extend through the insides of the housing 6 , cable 5 , and control device 3 . second ends of the detection signal lines 36 a 1 and 36 a 2 are connected to the control unit 26 . the detection signal lines 36 a 1 and 36 a 2 transmit a detection signal ( first detection signal ) indicating whether the switch 35 a opens or closes ( namely , indicating the operating state input with the operation button 31 a ) to the control unit 26 . then , the control unit 26 detects the operating state input with the operation button 31 a ( namely , whether the operation button 31 a is in the on state or the off state ) in accordance with the detection signal transmitted through the detection signal lines 36 a 1 and 36 a 2 . similarly , the switch 35 b is connected to the control unit 26 through the detection signal lines ( first detection signal lines ) 36 b 1 and 36 b 2 so that the detection signal lines 36 b 1 and 36 b 2 transmit a detection signal ( first detection signal ) indicating whether the switch 35 b opens or closes ( namely , the operating state input with the operation button 31 b ) to the control unit 26 . the control unit 26 detects the operating state input with the operation button 31 b ( namely , whether the operation button 31 b is in the on state or the off state ) in accordance with the detection signal transmitted through the detection signal lines 36 b 1 and 36 b 2 . as illustrated in fig1 , the housing 6 is provided with a selection button 41 as a selection member . in the present embodiment , the selection button 41 is placed on the grip 8 and exposed to the outside . the selection button 41 is placed at a portion facing an end of the width direction of the housing 6 ( in the direction perpendicular to the drawing paper of fig1 ) on the external surface of the housing 6 . the selection button 41 is placed nearer to the base side than the operation buttons 31 a and 31 b , and placed nearer to the longitudinal axis c than the force application unit 33 of the handle 11 . in this example , the selection button 41 can be a momentary selection member or can be an alternate selection member . when the selection button 41 is a momentary one , the selection button 41 is in the on state only while operation is input ( only while the selection button 41 is pressed ). on the other hand , when the selection button 41 is an alternate one , inputting operation input with the selection button 41 in the off state ( pressing the selection button 41 ) switches the selection button 41 into the on state . inputting operation input with the selection button 41 in the on state ( pressing the selection button 41 ) switches the selection button 41 into the off state . even when the input of operation ( pressing the selection button 41 ) is released , the selection button 41 is maintained to be in the off state . note that , when the selection button 41 is an alternate one , the housing 6 is provided with a state maintenance mechanism ( not illustrated ) that maintains the selection button 41 in the on state and the selection button 41 in the off state . as illustrated in fig2 , the inside of the housing 6 ( the inside of the grip 8 ) is provided with a switch 42 . the switch 42 is switched between the opening state and the closing state in accordance with the operating state input with the selection button 41 ( namely , whether the selection button 41 is in the on state or the off state ). first ends of the detection signal lines ( second detection signal lines ) 43 a and 43 b are connected to the switch 42 . the detection signal lines 43 a and 43 b extend through the insides of the housing 6 , cable 5 , and control device 3 . second ends of the detection signal lines 43 a and 43 b are connected to the control unit 26 . the detection signal lines 43 a and 43 b transmit a detection signal ( second detection signal ) indicating whether the switch 42 opens or closes ( namely , the operating state input with the selection button 41 ) to the control unit 26 . the control unit 26 detects the operating state input with the selection button 41 ( namely , whether the selection button 41 is in the on state or the off state ) in accordance with the detection signal transmitted through the detection signal lines 43 a and 43 b . note that an exemplary embodiment can be provided with a foot switch 34 as an operation input apparatus ( third input device ). in this example , the foot switch 34 is placed separately from the medical treatment tool 2 ( the housing 6 and end effector 18 ). with the foot switch 34 working as the operation input apparatus , operation for causing the medical treatment device 1 to function is input . the input of operation with the foot switch 34 is detected by the control unit 26 . next , the mechanisms and effects of the medical treatment tool 2 , control device 3 , and medical treatment device 1 according to the present embodiment will be described . fig3 is a flowchart of a process that the control unit 26 ( the control device 3 ) performs in accordance with the operating state input with the operation button ( first operation button ) 31 a . as illustrated in fig3 , while the control device 3 operates , the control unit 26 detects the operating state input with the selection button 41 ( namely , whether the selection button 41 is in the on state or the off state ) in accordance with the detection signal transmitted through the detection signal lines ( second detection signal lines ) 43 a and 43 b ( step s 101 ). when the selection button 41 is in the off state ( step s 101 — yes ), the control unit 26 detects the operating state input with the operation button 31 a in accordance with the detection signal transmitted through the detection signal lines ( first detection signal lines ) 36 a 1 and 36 a 2 , and detects whether the operation button 31 a is switched from the off state to the on state ( step s 102 ). when the operation button 31 a is switched to the on state ( step s 102 — yes ), the control unit 26 detects whether the selection button 41 is maintained to be in the off state ( step s 103 ), and detects whether a given period of time t 0 has elapsed since the operation button 31 a has been switched to the on state ( step s 104 ). in other words , the control unit 26 detects whether the selection button 41 is maintained to be in the off state until a given period of time t 0 has elapsed since the operation button 31 a has been switched to the on state in steps s 103 and s 104 . in this example , the control unit 26 sets the given period of time t 0 , for example , within a range between 0 . 05 and 1 seconds . note that , when the given period of time t 0 has not elapsed since the operation button 31 a has been switched to the on state in step s 104 ( step s 104 — no ), the process goes back to step s 102 . when the selection button 41 is maintained to be in the off state ( step s 103 — yes and s 104 — yes ) during the given period of time t 0 after the operation button 31 a is switched to the on state , the control unit 26 causes the medical treatment device 1 to function in the first mode ( step s 105 ). this causes the medical treatment device 1 to function in the first mode when the given period of time t 0 has elapsed after the operation button 31 a is switched from the off state to the on state while the selection button 41 is in the off state . in other words , the control unit 26 causes the medical treatment device 1 to function in the first mode in accordance with the fact that the operation button 31 a is in the on state when the selection button 41 is in the off state . in the present embodiment , by causing the medical treatment device 1 to function in the first mode , the control unit 26 supplies the electrical energy ( alternating current ) from the energy source 25 to the vibration generation unit 21 so as to transmit the ultrasonic vibration ( the first energy ) generated by the vibration generation unit 21 to the first grasp unit 16 of the end effector 18 . the control unit 26 causes the medical treatment device 1 to function in the first mode ( step s 105 ) as long as the operation button 31 a is maintained to be in the on state ( step s 106 — no ). in such a case , the medical treatment device 1 is maintained to be in the first mode regardless of the operating state input with the operation button ( second operation button ) 31 b . in other words , unless the operation button 31 a is switched from the on state to the off state , the medical treatment device 1 functions in the first mode even if the operation button 31 b is switched from the off state to the on state . when the operation button 31 a is switched from the on state to the off state ( step s 106 — yes ), the control unit 26 stops the output of energy from the energy source 25 ( step s 107 ) and thus the electrical energy is not supplied to the vibration generation unit 21 . the output of energy from the energy source 25 is stopped regardless of the operating state input with the operation button 31 b ( namely , whether the operation button 31 b is in the on state or the off state ). this stops the transmission of the ultrasonic vibration to the end effector 18 and stops the medical treatment device 1 from functioning . when the selection button 41 is switched to the on state ( step s 103 — no ) before the given period of time t 0 has elapsed since the operation button 31 a has been switched to the on state in step s 102 , the control unit 26 causes the alarm 29 to warn an error ( step s 108 ). meanwhile , the control unit 26 maintains the state in which the output of energy from the energy source 25 stops ( step s 109 ). this maintains the state in which the medical treatment device 1 is stopped from functioning . for example , the operator recognizes from the error warning of the alarm 29 that operation is not properly input with the operation button 31 a and the selection button 41 . when the selection button 41 is in the on state in step s 101 ( step s 101 — no ), the control unit 26 detects the operating state input with the operation button 31 a in accordance with the detection signal transmitted through the detection signal lines ( first detection signal lines ) 36 a 1 and 36 a 2 , and detects whether the operation button 31 a is switched from the off state to the on state ( step s 111 ). when the operation button 31 a is maintained to be in the off state ( step s 101 — no or step s 111 — no ), the control unit 26 maintains the state in which the output of energy from the energy source 25 is stopped ( step s 110 ) regardless of the operating state input with the selection button 41 ( in other words , whether the selection button 41 is in the on state or the off state ). this maintains the state in which the medical treatment device 1 is stopped from functioning in the process performed in accordance with the operating state input with the operation button 31 a unless the operation button 31 a is switched to the on state . when the selection button 41 is in the off state and the operation button 31 a is switched to the off state again before the given period of time t 0 has elapsed since the operation button 31 a has been switched to the on state ( step s 104 — no and s 102 — no ), the control unit 26 maintains the state in which the output of energy from the energy source 25 is stopped ( step s 110 ). when the selection button 41 is in the on state and the operation button 31 a is switched from the off state to the on state ( step s 101 — no and step s 111 — yes ), the control unit 26 causes the medical treatment device 1 to function in a second mode different from the first mode ( step s 112 ). thus , when the selection button 41 is in the on state and the operation button 31 a is switched from the off state to the on state , the medical treatment device 1 functions in the second mode . in other words , the control unit 26 causes the medical treatment device 1 to function in the second mode in accordance with the fact that the selection button 41 is in the on state and the operation button 31 a is in the on state . in the present embodiment , by causing the medical treatment device 1 to function in the second mode , the control unit 26 supplies the electrical energy ( alternating current ) from the energy source 25 to the vibration generation unit 21 and transmits the ultrasonic vibration ( first energy ) generated by the vibration generation unit 21 to the first grasp unit 16 of the end effector 18 , and transmits the high frequency energy ( second energy ) different from the ultrasonic vibration to the end effector 18 . as long as the operation button 31 a is maintained to be in the on state ( step s 113 — no ) and the selection button 41 is maintained to be in the on state ( step s 114 — no ), the control unit 26 causes the medical treatment device 1 to function in the second mode ( step s 112 ). in such a case , the medical treatment device 1 is maintained to be in the second mode regardless of the operating state of the operation button ( second operation button ) 31 b . in other words , as long as the operation button 31 a is not switched from the on state to the off state and the selection button 41 is not switched from the on state to the off state , the medical treatment device 1 functions in the second mode even if the operation button 31 b is switched from the off state to the on state . when the operation button 31 a is switched from the on state to the off state ( step s 113 — yes ), or when the selection button 41 is switched from the on state to the off state ( step s 114 — yes ), the control unit 26 stops the output of energy from the energy source 25 ( step s 115 ). this stops the supply of the electrical energy to the vibration generation unit 21 and thus stops the transmission of the ultrasonic vibration to the end effector 18 . this also stops the supply of the high frequency energy to the end effector 18 . in such a case , the output of energy from the energy source 25 is stopped regardless of the operating state input with the operation button 31 b ( in other words , whether the operation button 31 b is in the on state or the off state ). this stops the supply of energy to the end effector 18 , and stops the medical treatment device 1 from functioning . a process that the control unit 26 performs in accordance with the operating state input with the operation button ( second operation button ) 31 b is performed in a similar manner to the process performed in accordance with the operating state on the operation button ( first operation button ) 31 a ( see fig3 ). in other words , when the selection button 41 is in the off state and the operation button 31 b is switched from the off state to the on state , the control unit 26 detects whether the selection button 41 is maintained to be in the off state until the given period of time t 0 has elapsed since the operation button 31 b has been switched to the on state . when the selection button 41 is maintained to be in the off state until the given period of time t 0 has elapsed since the operation button 31 b has been switched to the on state , the control unit 26 causes the medical treatment device 1 to function in a third mode different from the first mode and the second mode . in other words , the control unit 26 causes the medical treatment device 1 to function in the third mode in accordance with the fact the selection button 41 is in the off state and the operation button 31 b is in the on state . in the present embodiment , by causing the medical treatment device 1 to function in the third mode , the control unit 26 supplies the high frequency energy to the end effector 18 . in this example , the high frequency energy is supplied in an appropriate amount , for an appropriate length of time , at an appropriate frequency for solidification . as long as the operation button 31 b is in the on state when the medical treatment device 1 functions in the third mode , the control unit 26 maintains the medical treatment device 1 in the third mode regardless of the operating state input with the operation button 31 a . when the operation button 31 b is switched to the off state , the control unit 26 stops the output of energy from the energy source 25 and stops the medical treatment device 1 from functioning regardless of the operation input with the operation button 31 a ( in other words , whether the operation button 31 a is in the on state or the off state ). when the selection button 41 is in the off state and the operation button 31 b is switched to the on state and the selection button 41 is switched from the off state to the on state before the given period of time t 0 has elapsed since the operation button 31 b has been switched to the on state , the control unit 26 warns an error and maintains the state in which the medical treatment device 1 is stopped from functioning . when the selection button 41 is in the on state and the operation button 31 b is switched from the off state to the on state , the control unit 26 causes the medical treatment device 1 to function in a fourth mode different from the first to third modes . in other words , the control unit 26 causes the medical treatment device 1 to function in the fourth mode in accordance with the fact that the selection button 41 is in the on state and the operation button 31 b is in the on state . in the present embodiment , by causing the medical treatment device 1 to function in the fourth mode , the control unit 26 supplies the same type of high frequency energy as the high frequency energy supplied in the third mode to the end effector 18 in a state in which the high frequency energy is supplied while at least one of the amount of the supplied high frequency energy , the length of time to supply the high frequency energy , and the frequency at which the high frequency energy is supplied is different from that in the third mode . at that time , the high frequency energy is supplied in an appropriate amount , for an appropriate length of time , at an appropriate frequency for sealing of a blood vessel . when the medical treatment device 1 functions in the fourth mode , the control unit 26 maintains the medical treatment device 1 in the fourth mode regardless of the operating state input with the operation button 31 a as long as the operation button 31 b is maintained to be in the on state and the selection button 41 is maintained to be in the on state . when the operation button 31 b is switched to the off state , or the selection button 41 is switched to off state , the control unit 26 stops the output of energy from the energy source 25 and stops the medical treatment device 1 from functioning regardless of the operating state input with the operation button 31 a ( in other words , whether the operation button 31 a is the on state or the off state ). as described above , when the operation button 31 a is in the on state , the detection signal ( the first detection signal ) indicating the operating state input with the operation button 31 a is transmitted through the detection signal lines 36 a 1 and 36 a 2 to the control unit 26 . this enables the control unit 26 to cause the medical treatment device 1 to function in a plurality of modes ( in the first mode or the second mode ). when the operation button 31 a is the on state , the detection signal ( the second detection signal ) indicating the operating state input with the selection button 41 ( whether the selection button 41 is in the on state or the off state ) is transmitted through the detection signal lines 43 a and 43 b to the control unit 26 . then , the control unit 26 selects ( determines ) a mode in which the medical treatment device 1 functions ( the first mode or the second mode ) from the modes in accordance with the transmitted detection signal ( the second detection signal ). similarly , when the operation button 31 b is in the on state , the detection signal ( the first detection signal ) indicating the operating state input with the operation button 31 b is transmitted through the detection signal lines 36 b 1 and 36 b 2 to the control unit 26 . this enables the control unit 26 to cause the medical treatment device 1 to function in a plurality of modes ( the third mode or the fourth mode ). when the operation button 31 b is the on state , the detection signal ( the second detection signal ) indicating the operating state input with the selection button 41 ( whether the selection button 41 is in the on state or the off state ) is transmitted through the detection signal lines 43 a and 43 b to the control unit 26 . then , the control unit 26 selects ( determines ) a mode in which the medical treatment device 1 functions ( the third mode or the fourth mode ) from the modes in accordance with the transmitted detection signal ( the second detection signal ). thus , in the present embodiment , only providing a selection button ( selection member ) 41 enables the control unit 26 to cause the medical treatment device 1 to function in a plurality of modes when each of the operation buttons ( the operation members ) 31 a and 31 b is in the on state by performing the process in accordance with the operating state input with the operation button 31 a illustrated in fig3 , and the process in a similar manner to the process illustrated in fig3 in accordance with the operating state input with the operation button 31 b . this enables the medical treatment device 1 to function in many modes even when the number of the operation buttons 31 a and 31 b is reduced . in the detection of the operating states input with the operation buttons 31 a and 31 b , and the selection button 41 , for example , when the selection button 41 is switched from the off state to the on state before the given period of time t 0 has elapsed since the operation button ( 31 a or 31 b ) has been switched to the on state , it is sometimes difficult to determine whether the operation button ( 31 a or 31 b ) and the selection button 41 are simultaneously in the on state . in the present embodiment , the process in accordance with the operating state input with the operation button 31 a illustrated in fig3 , and the process in a similar manner to the process illustrated in fig3 in accordance with the operating state input with the operation button 31 b are processed . by performing the processes , the control unit 26 warns an error when it is difficult to determine whether the operation button ( 31 a or 31 b ) and the selection button 41 are simultaneously in the on state . this warning effectively prevents the medical treatment device 1 from functioning in a mode that the operator does not intend . to treat an object to be treated using the medical treatment device 1 , the operator holds the housing 6 and the handle 11 and inserts the head of the sheath 13 and the end effector 18 , for example , into an abdominal cavity . the operator opens or closes the handle 11 with respect to the grip 8 while inserting the sheath 13 and the end effector 18 in a body cavity in order to open or close the grasp units 16 and 17 , rotate the rotating knob 12 around the longitudinal axis c in order to adjust the angle of the position of the end effector 18 around the longitudinal axis c . fig4 is a diagram of a state in which the operator holds the housing 6 and the handle 11 . as illustrated in fig4 , for example , when the operator holds the housing 6 and the handle 11 with the operator &# 39 ; s right hand h , the operator puts the grip 8 of the housing 6 between the operator &# 39 ; s thumb f 1 and palm p . the operator puts the operator &# 39 ; s ring finger f 4 and little finger f 5 ( or middle finger f 3 , ring finger f 4 , and little finger f 5 depending on the operator ) on the force application unit 33 of the handle 11 so as to apply operation force on the handle 11 using the operator &# 39 ; s ring finger f 4 and little finger f 5 ( or middle finger f 3 , ring finger f 4 , and little finger f 5 depending on the operator ) in order to close the handle 11 with respect to the grip 8 . the operator uses the operator &# 39 ; s index finger f 2 or middle finger f 3 to rotate the rotating knob 12 and input operation with each of the operation buttons 31 a and 31 b ( press each of the operation buttons 31 a and 31 b ). in the present embodiment , the selection button ( selection member ) 41 is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b on the outer surface of the housing 6 . this placement enables the operator to input operation with the selection button 41 ( to press the selection button 41 ) using the thumb f 1 while grasping the grip 8 between the thumb f 1 and the palm p . thus , the operator can switch the selection button 41 between on state and off state using the thumb f 1 . thus , the operator does not use the operator &# 39 ; s index finger f 2 , middle finger f 3 , ring finger f 4 , and little finger f 5 , which are used for at least one of operations for opening and closing the handle 11 , rotating the rotating knob 12 , and inputting operation with the operation buttons 31 a and 31 b , in order to input operation with the selection button 41 . thus , the operator does not need to change the positions and postures of the operator &# 39 ; s index finger f 2 , middle finger f 3 , ring finger f 4 and little finger f 5 in order to switch the selection button 41 between the on state and the off state in treatment , and does not need also to hold the housing 6 and the handle 11 again with the operator &# 39 ; s right hand h . this secures the operability for opening and closing the handle 11 , rotating the rotating knob 12 , and inputting operation with the operation buttons 31 a and 31 b , and secures also the operability for inputting operation with the selection button 41 . as described above , the present embodiment can provide the medical treatment device ( 1 ) that switches the modes in which the medical treatment device ( 1 ) functions in accordance with the operating state input with the selection member ( 41 ), and secures the operability of the operation members ( 31 a and 31 b ), and the selection member ( 41 ). note that , when the operation button 31 a is in the on state in the first embodiment , the medical treatment device 1 can function in the mode in which ultrasonic vibration is transmitted to the end effector 18 ( the first mode ) and in the mode in which ultrasonic vibration is transmitted and the high frequency energy is also supplied to the end effector 18 ( the second mode ) in accordance with the operating state input with the selection button 41 . however , the mode is not limited to the modes according to the first embodiment . similarly , when the operation button 31 b is in the on state , the medical treatment device 1 can function in the mode in which high frequency energy is supplied to the end effector 18 in an amount appropriate for solidification ( the third mode ) and in the mode in which high frequency energy is supplied to the end effector 18 in an amount appropriate for sealing of a blood vessel ( the fourth mode ) in accordance with the operating state input with the selection button 41 . however , the mode is not limited to the modes according to the first embodiment . fig5 is a diagram ( table ) of patterns of switching of the modes in which the medical treatment device 1 functions in accordance with the operating state input with the selection button 41 . when the operation button 31 a is in the on state in the first embodiment , the medical treatment device 1 functions in a pattern x 1 illustrated in fig5 in accordance with the operating state input with the selection button 41 . when the operation button 31 b is in the on state , the medical treatment device 1 functions in a pattern x 2 illustrated in fig5 in accordance with the operating state input with the selection button 41 . however , in an exemplary variation , the medical treatment device 1 functions in the pattern x 2 when the operation button 31 a is in the on state and the medical treatment device 1 functions in the pattern x 1 when the operation button 31 b is in the on state . in other words , the control unit 26 causes the medical treatment device 1 to function , for example , in one of patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection button 41 . the first embodiment is provided with two operation buttons 31 a and 31 b . however , the number of the operation buttons can be one , or three or more . in other word , at least an operation button ( 31 a or 31 b ) needs being provided . when one operation button is provided , the control unit 26 causes the medical treatment device 1 to function in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection button 41 . hereinafter , each of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 will be described . note that the patterns x 1 and x 2 have already described in the first embodiment , and thus the description will be omitted . in the pattern xa 1 , the medical treatment device 1 functions in a mode in which ultrasonic vibration is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is in the on state . the medical treatment device 1 functions in a mode in which the ultrasonic vibration and heat are transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . in this pattern , the end effector 18 is provided with a heating element ( not illustrated ) so that the electrical energy ( direct current power or alternating current power ) is supplied from the energy source 25 to the heating element . then , the heat generated by the heating element is transmitted to the end effector 18 . in the pattern xa 2 , the medical treatment device 1 functions in a mode in which high frequency energy is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is in the on state . the medical treatment device 1 functions in a mode in which heat is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . in the pattern x 3 , the medical treatment device 1 functions in a mode in which high frequency energy is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is in the on state . the medical treatment device 1 functions in a mode in which ultrasonic vibration is transmitted to the end effector 18 and water is conveyed near the end effector 18 through a water convey path ( not illustrated ) in accordance with the fact the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . in this pattern , a water convey source ( not illustrated ) that supplies water ( liquid ) through the water convey path is provided , and the control unit 26 controls the operation , for example , of a water convey pump of the water convey source . in each mode described in the pattern xa 3 , the function to supply high frequency energy to the end effector 18 is added to the functions of the mode corresponding to the pattern x 3 . alternatively , in the pattern x 4 , the medical treatment device 1 functions in a mode in which ultrasonic vibration is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is in the on state . the medical treatment device 1 functions in a mode in which ultrasonic vibration is transmitted to the end effector 18 and suction is performed from the periphery of the end effector 18 through a suction path ( not illustrated ) in accordance with the fact the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . in this pattern , a suction source ( not illustrated ) that perform suction through the suction path , and the control unit 26 controls the operation , for example , of a suction pump of the suction source . in each mode in the pattern xa 4 , the function to supply high frequency energy to the end effector 18 is added to the functions of the mode corresponding to the pattern x 4 . alternatively , in the pattern x 5 , the medical treatment device 1 functions in a mode in which ultrasonic vibration is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is in the on state . the medical treatment device 1 functions in a mode in which a different type of high frequency energy ( the second energy ) from the ultrasonic vibration ( the first energy ) is transmitted to the end effector 18 in accordance with the fact the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . instead of the supply of high frequency energy in the pattern x 5 , heat is transmitted to the end effector 18 in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern xa 5 . the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in the pattern x 5 is switched to the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern x 6 . the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern x 5 is switched to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in the pattern x 6 . similarly , the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in the pattern xa 5 is switched to the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern xa 6 . the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern xa 5 is switched to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in the pattern xa 6 . high frequency energy is supplied to the end effector 18 in each mode of the pattern x 7 instead of the transmission of ultrasonic vibration in the mode corresponding to the pattern x 3 . similarly , high frequency energy is supplied to the end effector 18 in each mode of the pattern x 8 instead of the transmission of ultrasonic vibration in the mode corresponding to the pattern x 4 . in a mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in the pattern x 9 , the output of energy from the energy source 25 is maintained as long as operation is input with the operation button ( 31 a or 31 b ). in other words , in a mode in which the medical treatment device 1 functions when the selection button 41 is in the off state , the supply of energy to the end effector 18 is maintained as long as the operation button ( 31 a or 31 b ) is maintained to be in the on state . when the mode is switched to a mode in which the medical treatment device 1 functions when the selection button 41 is in the on state , the output of energy is automatically stopped in accordance with the fact that a predetermined period of time t ′ 0 has elapsed since the start of the output of energy from the energy source 25 . in other words , in a mode in which the medical treatment device 1 functions when the selection button 41 is in the on state , the supply of energy to the end effector 18 is stopped when the predetermined period of time t ′ 0 has elapsed since the start of the output of energy even while the operation button ( 31 a or 31 b ) is maintained to be in the on state . even in such a case , however , the output of energy is started in accordance with the fact that the selection button 41 is in the on state and the operation button ( 31 a or 31 b ) is in the on state . note that , when ultrasonic vibration is transmitted as energy to the end effector 18 and the mode is switched to the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state , the output of energy can automatically be stopped in accordance with the fact that a predetermined period of time t ′ 1 has elapsed since the start of a phase locked loop control ( pll control ). an incision is detected based on a sound impedance z in a mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in the pattern xa 9 instead of stopping the output of energy after the predetermined period of time t ′ 0 has elapsed in the pattern x 9 . in this pattern , ultrasonic vibration is transmitted as energy to the end effector 18 so that the object to be treated that is grasped between the grasp units 16 and 17 is sectioned with the ultrasonic vibration . the control unit 26 chronologically detects , in the vibration generation unit 21 , the sound impedance z of the electrical energy ( alternating current power ) supplied to the vibration generation unit 21 . when the sound impedance z exceeds a set threshold zth , it is determined that the incision of the object to be treated is completed . when it is determined that the incision is completed , the control unit 26 notifies the operator of the completion of incision or the output of energy from the energy source 25 is automatically stopped . this prevents the ultrasonic vibration from wearing the end effector 18 after the completion of incision . in the pattern x 10 , the detection of an incision described in the pattern xa 9 is performed both in a mode in which the medical treatment device 1 functions when the selection button 41 is in the off state and in a mode in which the medical treatment device 1 functions when the selection button 41 is in the on state . however , in the pattern x 10 , the threshold zth is set at a high value in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state , and the threshold zth is set at a low value in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in comparison to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state . in the pattern x 11 , energy ( electrical energy ) to be supplied from the energy source 25 to the vibration generation unit 21 at a normal level is output so that ultrasonic vibration is transmitted to the end effector 18 in a mode in which the medical treatment device 1 functions when the selection button 41 is in the off state . the level at which the energy is output is lowered in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in comparison with the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state so that the amplitude of the ultrasonic vibration is reduced in the end effector 18 . in each of the patterns xa 11 to xc 11 , high frequency energy is output at a normal level from the energy source 25 in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state so that the high frequency energy is supplied to the end effector 18 . in each of the patterns xa 11 to xc 11 , the level at which the high frequency energy is output is lowered in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in comparison to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state . this causes the reduction in the high frequency electricity as the pattern xa 11 , or the reduction in the maximum value ( wave height ) of the high frequency voltage as the pattern xb 11 , or the reduction in the maximum value ( wave height ) of the high frequency current as the pattern xc 11 . in contrast to the pattern x 11 , the level at which the high frequency energy is output is increased in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in comparison to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state so that the amplitude of the ultrasonic vibration in the end effector 18 is increased in the pattern x 12 . in contrast to the patterns xa 11 to xc 11 , the level at which the high frequency energy is output is increased in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state in comparison to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state in each of the patterns xa 12 to xc 12 . this causes the increase in the high frequency electricity as the pattern xa 12 , the increase in the maximum value ( wave height ) of the high frequency voltage as the pattern xb 12 , or the increase in the maximum value ( wave height ) of the high frequency current as the pattern xc 12 . in the pattern x 13 , energy ( for example , high frequency energy , or the electrical energy to the vibration generation unit 21 ) is output from the energy source 25 at a level used for treatment in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state ( the first mode ) so that the energy to be used for treatment ( for example , high frequency energy or ultrasonic vibration ) is supplied to the end effector 18 . in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state ( the second mode ), the measurement unit 28 measures a predetermined parameter . when high frequency energy is supplied to the end effector 18 , the predetermined parameter to be measured can be , for example , the phase difference between the high frequency current and the high frequency voltage , the value of the high frequency current , the value of the high frequency voltage , or the chronological variations thereof . when the ultrasonic vibration is transmitted to the end effector 18 , the predetermined parameter to be measured can be , for example , the phase difference between the current and voltage of the electrical energy supplied to the vibration generation unit 21 , the value of current , the value of voltage , or the chronological variations thereof . when high frequency energy is supplied to the end effector 18 , an impedance z ′ of the object to be treated that is grasped between the grasp units 16 and 17 can be measured as the predetermined parameter . when the impedance z ′ of the object to be treated is measured as the predetermined parameter the object to be treated , the high frequency energy is output from the energy source 25 at a lower level than the level used for the treatment and the high frequency energy is supplied to the end effector 18 . in the first exemplary variation , the mode in which the medical treatment device 1 functions is switched as the illustrated pattern x 14 in accordance with the operating state input with the selection button 41 . fig6 is an explanatory diagram of a plurality of modes in which the medical treatment device 1 according to the present exemplary variation can function . as illustrated in fig5 and 6 , in the pattern x 14 , energy ( for example , high frequency energy , or the electrical energy to the vibration generation unit 21 ) is output at a set level from the energy source 25 so that energy used for treatment ( for example , high frequency energy or ultrasonic vibration ) is supplied to the end effector 18 in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state ( the first mode ). in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state ( the second mode ), the process performed by the level setting unit 27 of the control unit 26 changes the set level of the energy output from the energy source 25 . for example , in an exemplary embodiment illustrated in fig6 , ultrasonic vibration is transmitted to the end effector 18 when the mode is switched to a mode in which the medical treatment device 1 functions in accordance with the fact that the selection button 41 is in the off state and the operation button 31 a is in the on state . in this example , the energy source 25 supplies the electrical energy at a set level among the levels y 1 to y 3 of to the vibration generation unit 21 . in a mode in which the medical treatment device 1 functions in accordance with that fact that the selection button 41 is in the on state and the operation button 31 a is the on state , the control unit 26 changes the set level of the electrical energy supplied to the vibration generation unit 21 ( arrow a 1 , a 2 , or a 3 in fig6 ). in this example , only the level of the electrical energy is changed . the electrical energy is not output from the energy source 25 to the vibration generation unit 21 . in the exemplary embodiment illustrated in fig6 , high frequency energy is supplied to the end effector 18 when the mode is switched to the mode in which the medical treatment device 1 functions in accordance with the fact the selection button 41 is in the off state and the operation button 31 b is in the on state . in this example , the energy source 25 supplies the high frequency energy at a set level among the levels y ′ 1 to y ′ 3 to the end effector 18 . in a mode in which the medical treatment device 1 functions in accordance with the fact that the selection button 41 is in the on state and the operation button 31 b is the on state , the control unit 26 changes the set level of the high frequency energy supplied to the end effector ( arrow a ′ 1 , a ′ 2 , or a ′ 3 in fig6 ). in this example , only the set level of the high frequency energy is changed . the high frequency energy is not output from the energy source 25 to the end effector 18 . when the mode is switched in the pattern x 15 in an exemplary variation , energy ( for example , high frequency energy or the electrical energy to the vibration generation unit 21 ) is output at a level used for treatment from the energy source 25 so that the energy used for treatment ( for example , high frequency energy or ultrasonic vibration ) is supplied to the end effector 18 in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state ( the first mode ). the energy is supplied to the end effector 18 in a similar manner to the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state , and the handle 11 is electrically operated and closed in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state ( the second mode ). in this example , the inside of the housing 6 is provided with an electric motor ( not illustrated ) so that electrical energy ( drive electricity ) is supplied from the energy source 25 to the electric motor . this electricity drives the electric motor . driving the electric motor makes driving force act on the handle 11 so that the handle 11 is closed . the process in accordance with the operating state input with the operation button ( 31 a or 31 b ) is not limited to the process illustrated in fig3 and the process performed in a similar manner to fig3 . for example , when the selection button 41 is in the off state and the operation button ( 31 a or 31 b ) is switched to the on state ( step s 101 — yes and s 102 — yes in fig3 ) and the selection button 41 is switched from the off state to the on state before the given period of time t 0 has elapsed since the operation button ( 31 a or 31 b ) has been switched to the on state ( step s 103 — no in fig3 ), an error is warned and a state in which the medical treatment device 1 is stopped from functioning is maintained in the first embodiment . however , when the selection button 41 is switched from the off state to the on state before the given period of time t 0 has elapsed since the operation button ( 31 a or 31 b ) has been switched to the on state , it is determined in an exemplary variation that the operation button ( 31 a or 31 b ) and the selection button 41 are simultaneously in the on state . then , the control unit 26 causes the medical treatment device 1 to function in a mode in which the medical treatment device 1 functions in accordance with the fact that the operation button ( 31 a or 31 b ) and the selection button 41 are simultaneously in the on state ( for example , the second mode ). in an exemplary variation , as long as the control by the control unit 26 maintains the operation button ( 31 a or 31 b ) in the on state , the mode in which the medical treatment device 1 functions is not changed even when the operating state is switched with the selection button 41 ( the selection button 41 is switched between the on state and the off state ). to switch the mode in which the medical treatment device 1 functions in this example , it is necessary to switch the operation button ( 31 a or 31 b ) from the off state to the on state after the operating state input with the selection button 41 is switched while the operation button ( 31 a or 31 b ) is in the off state . in contrast , in another exemplary variation , the control by the control unit 26 switches the operating state input with the selection button 41 ( switches the selection button 41 between the on state and the off state ). this switching changes the mode in which the medical treatment device 1 functions even while the operation button ( 31 a or 31 b ) is in the on state . in the second exemplary variation , the mode in which the medical treatment device 1 functions is switched to the mode as the pattern x 16 illustrated in fig5 in accordance with the operating state input with the selection button 41 . in the pattern x 16 , the medical treatment device 1 operates in accordance with the operation input with the foot switch ( the operation input apparatus ) 34 in the mode in which the medical treatment device 1 functions when the selection button 41 is in the off state ( the first mode ). in other words , when the selection button 41 is in the off state , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 regardless of the operation input with the operation button ( 31 a or 31 b ) ( whether the operation button ( 31 a or 31 b ) is in the on state or the off state ). for example , when operation is input with the foot switch 34 , energy ( for example , high frequency energy , or the electrical energy to the vibration generation unit 21 ) is output from the energy source 25 so that the energy used for treatment ( for example , high frequency energy or ultrasonic vibration ) is supplied to the end effector 18 . on the other hand , in the pattern x 16 , the medical treatment device 1 operates in accordance with the operation input with the operation button ( the operation member ) 31 a or 31 b in the mode in which the medical treatment device 1 functions when the selection button 41 is in the on state ( the second mode ). in other words , when the selection button 41 is in the on state , the medical treatment device 1 operates in accordance with the operation input with the operation button ( 31 a or 31 b ) regardless of the operation input with the foot switch 34 . for example , when operation is input with the operation button 31 a , energy ( for example , high frequency energy , or the electrical energy to the vibration generation unit 21 ) is output from the energy source 25 so that the energy used for treatment ( for example , high frequency energy or ultrasonic vibration ) is supplied to the end effector 18 . fig7 is a diagram of the configuration to detect the operating state input with each of the operation buttons 31 a and 31 b , and the selection button 41 in the present exemplary variation . in the present exemplary variation , the operating state input with the operation button corresponding to each of the switches 35 a and 35 b ( the operation button 31 a or 31 b ) is detected in accordance with whether each of the switches 35 a and 35 b opens or closes , and the operating state input with the selection button 41 is detected in accordance with whether the switch 42 opens or closes . as illustrated in fig7 , in the present exemplary variation , the control unit 26 is connected to the switch 35 a through the detection signal line 45 a , and the control unit 26 is connected to the switch 35 b through the detection signal line 45 b . similarly , the control unit 26 is connected to the switch 42 through the detection signal line 45 c . in the present exemplary variation , the switches 35 a and 42 are electrically arranged in series each other and the switches 35 b and 42 are electrically arranged each other . the detection signal lines 45 a to 45 c are a first detection signal line that transmits a detection signal ( first detection signal ) indicating the operating state input with each of the operation buttons 31 a and 31 b to the control unit 26 , and are a second detection signal line that transmits a detection signal ( second detection signal ) indicating the operating state input with the selection button 41 to the control unit 26 . in the present exemplary variation , when both the operation button 31 a and the selection button 41 are in the on states , both the switches 35 a and 42 are closed and thus the detection current flows through the detection signal lines 45 a and 45 c . the flow of the detection current through the detection signal lines 45 a and 45 c switches the mode to a mode in which the medical treatment device 1 operates in accordance with the operation input with the operation button 31 a and , for example , energy used for treatment is transmitted to the end effector 18 in accordance with the operation input with the operation button 31 a . when the selection button 41 is in the off state , the detection current does not flow through the detection signal lines 45 a and 45 c even when the operation button 31 a is in the on state . thus , when the selection button 41 is in the off state , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 even when the operation button 31 a in the on state . accordingly , when the operation button 31 a and the selection button 41 are momentary ones , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 unless operation is simultaneously input with the operation button 31 a and the selection button 41 ( unless the operation button 31 a and the selection button 41 are simultaneously pressed ) even when the operation is input with the operation button 31 a ( the operation button 31 a is pressed ). in the present exemplary variation , when both the operation button 31 b and the selection button 41 are in the on states , both the switches 35 b and 42 are closed and thus the detection current flows through the detection signal lines 45 b and 45 c . the flow of the detection current through the detection signal lines 45 b and 45 c switches the mode to a mode in which the medical treatment device 1 operates in accordance with the operation input with the operation button 31 b and , for example , energy used for treatment is transmitted to the end effector 18 in accordance with the operation input with the operation button 31 b . when the selection button 41 is in the off state , the detection current does not flow through the detection signal lines 45 b and 45 c even when the operation button 31 b is in the on state . thus , when the selection button 41 is in the off state , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 even when the operation button 31 b is the on state . accordingly , when the operation button 31 b and the selection button 41 are momentary ones , the medical treatment device 1 operates in in accordance with the operation input with the foot switch 34 unless the operation is simultaneously input with the operation button 31 b and the selection button 41 ( unless the operation button 31 b and the selection button 41 are simultaneously pressed ) even when operation is input with the operation button 31 b ( even when the operation button 31 b is pressed ). fig8 is a diagram of the configuration to detect the operating state input with each of the operation buttons 31 a and 31 b in a third exemplary variation . in the present exemplary variation , the operating state input with the operation button corresponding to each of the switches 35 a and 35 b ( the operation button 31 a or 31 b ) is also detected in accordance with whether each of the switches 35 a and 35 b opens or closes . as illustrated in fig8 , in the present exemplary variation , the control unit 26 is connected to the switch 35 a through the detection signal line 46 a , and the control unit 26 is connected to the switch 35 b through the detection signal line 46 b . similarly , the control unit 26 is connected to the switches 35 a and 35 b through the detection signal line 46 c . the detection signal lines ( first detection signal lines ) 46 a to 46 c transmits a detection signal ( first detection signal ) indicating the operating state input with each of the operation buttons 31 a and 31 b to the control unit 26 . in the present exemplary variation , when the operation button 31 a is in the on state and the operation button 31 b is in the off state , the detection current flows through the detection signal lines 46 a and 46 b . when the operation button 31 a is in the off state and the operation button 31 b is in the on state , the detection current flows through the detection signal lines 46 b and 46 c . when both the operation buttons 31 a and 31 b are in the on states , the detection current flows through the detection signal lines 46 a and 46 b . thus , both when the selection button 41 is in the off state and when the selection button 41 is in the on state in the present exemplary variation , the medical treatment device 1 can function in three modes ; a mode in which only the operation button 31 a is in the on state , a mode in which only the operation button 31 b is in the on state , and a mode in which both the operation buttons 31 a and 31 b are in the on states . in other words , both when the selection button 41 is in the off state and when the selection button 41 is in the on state , the medical treatment device 1 can function in a larger number of modes than the number of the operation buttons 31 a and 31 b that are the operation members . in an exemplary embodiment , when the selection button 41 is in the on state and only the operation button 31 a is in the on state , ultrasonic vibration is supplied to the end effector 18 . alternatively , when the selection button 41 is in the on state and only the operation button 31 b is in the on state , high frequency energy is supplied to both the grasp units 16 and 17 of the end effector 18 so that a bipolar treatment by the high frequency energy is performed . alternatively , when the selection button 41 is in the on state and both the operation buttons 31 a and 31 b are in the on states , high frequency energy is supplied to only one of the grasp units 16 and 17 of the end effector 18 so that a mono - polar treatment by the high frequency energy is performed . in the embodiments , when the selection button 41 that is a selection member is an alternate button , the selection button 41 is maintained to be in both the on state and the off state . however , the selection member is not limited to the alternate button . for example , the external surface of the housing 6 is provided with a selection lever 41 a as the selection member in a fourth exemplary variation illustrated in fig9 to 11 . the selection lever 41 a is placed at a portion facing a first end of the housing 6 in the width direction of the housing 6 ( the direction perpendicular to the drawing papers of fig9 and fig1 ) on the external surface of the housing 6 . the external surface of the housing 6 is provided with a concavity 47 in the present exemplary variation so that the selection lever 41 a can rotate around a rotation shaft r 1 in the concavity 47 . the selection lever 41 a can rotate between an off state position ( the position illustrated in fig9 ) and an on state position ( the position illustrated in fig1 ). in the present exemplary variation , the selection lever 41 a is also placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . thus , the thumb f 1 can input operation with the selection lever 41 a ( can rotate the selection button 41 a ) while the grip 8 is grasped between the thumb f 1 and the palm p . the thumb f 1 switches the selection lever 41 a between the on state and the off state . in the present exemplary variation , the external surface of the housing 6 is provided with engagement protrusions 48 a and 48 b in the concavity 47 . an engagement groove 49 , which can be engaged with the engagement protrusions 48 a and 48 b , is formed on the selection lever 41 a . the engagement of the engagement groove 49 with the engagement protrusion 48 a fixes the selection lever 41 a on the off state position with respect to the housing 6 so that the selection lever 41 a that is the selection member is maintained to be in the off state . in other words , the engagement protrusion 48 a and the engagement groove 49 work as a state maintenance mechanism that maintains the selection lever 41 a in the off state . the engagement of the engagement groove 49 with the engagement protrusion 48 b fixes the selection lever 41 a on the on state position with respect to the housing 6 so that the selection lever 41 a that is the selection member is maintained to be in the on state . in other words , the engagement protrusion 48 b and the engagement groove 49 work as a state maintenance mechanism that maintains the selection lever 41 a in the on state . in a fifth exemplary variation illustrated in fig1 to 14 , the external surface of the housing 6 is provided with a selection slider 41 b as the selection member . the selection slider 41 b is placed at a portion facing a side opposite to the side on which the force application unit 33 is placed with respect to the longitudinal axis c ( the upper side of fig1 ) on the external surface of the housing 6 . in the present exemplary variation , the selection slider 41 b can move in the direction along the longitudinal axis c with respect to the housing 6 . moving the selection slider 41 b switches the selection slider 41 b between the off state ( the state illustrated in fig1 ) and the on state ( the state illustrated in fig1 ). in the present exemplary variation , the selection slider 41 b is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . thus , the thumb f 1 can input operation with the selection slider 41 b ( can move the selection slider 41 b ) while the grip 8 is grasped between the thumb f 1 and the palm p . the thumb f 1 switches the selection slider 41 b between the on state and the off state . in the present exemplary variation , the internal surface of the selection slider 41 b is provided with a groove 58 and a pressure unit 59 . as illustrated in fig1 , moving the selection slider 41 b to a position at which the switch 42 is inserted into the groove 58 prevents the selection slider 41 b from pressing the switch 42 . thus , the switch 42 is maintained to be in an opening state and the selection slider 41 b is maintained to be in the off state . in other words , the groove 58 works as a state maintenance mechanism that maintains the selection slider 41 b in the off state . when the selection slider 41 b is moved to a position at which the pressure unit 59 presses the switch 42 , the pressure by the pressure unit 59 maintains the switch 42 in a closing state . this maintains the selection slider 41 b in the on state . in other words , the pressure unit 59 works as a state maintenance mechanism that maintains the selection slider 41 b in the on state . in the embodiments described above , the selection member ( 41 , 41 a , or 41 b ) is placed on the external surface of the housing 6 . however , the placement is not limited to the embodiments . for example , in a sixth exemplary variation illustrated in fig1 , the inside of the housing 6 is provided with a selection switch 41 c including a switch 42 as the selection member . in the present exemplary variation , the selection switch 41 c is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . in the present exemplary variation , the selection switch 41 c is placed on a position at which the handle 11 can press the selection switch 41 c so that the handle 11 opens or closes with respect to the housing 6 . this opening or closing varies the pressure from the handle 11 on the selection switch 41 c . the variation in the pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the on state and the off state ( in other words , the variation switches the operating states input with the selection switch 41 c ). note that switching the operating states input with the selection switch 41 c switches the switch 42 between the opening and closing states . for example , when the selection switch 41 c is a momentary one , closing the handle 11 with respect to the grip 8 causes the handle 11 to press the selection switch 41 c so that the selection switch 41 c is switched to the on state . opening the handle 11 with respect to the grip 8 prevents the handle 11 from having contact with the selection switch 41 c so that the selection switch 41 c is switched to in the off state . in the present exemplary variation , the control unit 26 also causes the medical treatment device 1 to function , for example , in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection switch 41 c . in the present exemplary variation , the selection switch ( the selection member ) 41 c is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b in the housing 6 . thus , opening or closing the handle 11 with respect to the housing 6 can vary the pressure from the handle 11 on the selection switch 41 c . in other words , in the present exemplary variation , opening or closing the handle 11 simultaneously switches the selection switch 41 c between the on state and the off state . in the present exemplary variation , the housing 6 and the handle 11 are held as described in the first embodiment ( see fig4 ). thus , it is unnecessary in the present exemplary variation to change the positions and postures of the operator &# 39 ; s index finger f 2 , middle finger f 3 , ring finger f 4 , and little finger f 5 and to hold the housing 6 and the handle 11 again with the operator &# 39 ; s right hand h during the input of operation with the selection switch 41 c because opening or closing the handle 11 switches the operating states input with the selection switch 41 c . thus , in the present exemplary variation , the operability for opening and closing the handle 11 , rotating the rotating knob 12 , inputting operation with the operation buttons 31 a and 31 b is secured and the operability for inputting operation with the selection switch 41 c is also secured . in a seventh exemplary variation illustrated in fig1 and 17 , opening and closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the off state ( the state illustrated in fig1 ) and the on state ( the state illustrated in fig1 ). in the present exemplary variation , a movable tube 71 extends along the longitudinal axis c in the housing body 7 . the movable tube 71 moves together with a movable pipe ( not illustrated ) along the longitudinal axis c in response to the opening or closing of the handle 11 . a ring - shaped sliding member 72 is placed on the outer peripheral surface of the movable tube 71 . the handle 11 is coupled with the sliding member 72 in the housing body 7 . the sliding member 72 can move along the longitudinal axis c with respect to the movable tube 71 . a tube - shaped elastic member ( coil spring ) 73 is also placed on the outer peripheral surface of the movable tube 71 . a first end ( the head ) of the elastic member 73 is connected to the movable tube 71 and a second end ( the base ) of the elastic member 73 is connected to the sliding member 72 . in the present exemplary variation , closing the handle 11 with respect to the grip 8 when the selection switch 41 c that is the selection member is in the off state moves the movable tube 71 and the movable pipe toward the head side so that the grasp units 16 and 17 are closed . thus , the object to be treated is grasped between the grasp units 16 and 17 so that the object to be treated is compressed . when the object to be treated is compressed to some extent , the motion of the movable tube 71 and the movable pipe stops . further closing the handle 11 from that state moves the sliding member 72 toward the head side with respect to the movable tube 71 . this causes the elastic member 73 to contract . this contraction of the elastic member 73 increases the holding force between the grasp units 16 and 17 . in the present exemplary variation , the elastic member 73 contracts by a predetermined contraction amount ( a predetermined stroke ) or more . this contraction causes the handle 11 to press the selection switch 41 c ( the switch 42 ) and thus the selection switch 41 c is switched from the off state to the on state . thus , even when the handle 11 is closed , the selection switch 41 c is maintained to be in the off state unless the application of operation force in an amount more than or equal to a predetermined amount causes the elastic member 73 to contract by a predetermined contraction amount or more . thus , in the present exemplary variation , the selection switch 41 c is switched to the on state only when the object to be treated is grasped between the grasp units 16 and 17 and the force application unit 33 applies the operation force more than or equal to a predetermined amount of force and the handle 11 is closed . in an eighth exemplary variation illustrated in fig1 and 19 , opening or closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the off state ( the state illustrated in fig1 ) and the on state ( the state illustrated in fig1 ). in the present exemplary variation , the inside of the housing 6 is provided with a stopper 75 . the stopper 75 is fixed with respect to the housing 6 . in the present exemplary variation , closing the handle 11 with respect to the grip 8 when the selection switch 41 c that is the selection member is in the off state causes the handle 11 to have contact with the stopper 75 . further closing the handle 11 from that state causes the handle 11 to warp on the contact position with the stopper 75 as a fulcrum . in the present exemplary variation , the handle 11 warps by a predetermined warping amount or more after the handle 11 comes into contact with the stopper 75 . this warping causes the handle 11 to press the selection switch 41 c ( the switch 42 ), and thus switches the selection switch 41 c from the off state to the on state . thus , even when the handle 11 is closed , the selection switch 41 c is maintained to be in the off state unless the application of operation force in an amount more than or equal to a predetermined amount causes the handle 11 to warp by a predetermined warping amount or more . thus , similarly to the seventh exemplary variation , the selection switch 41 c is switched to the on state only when the object to be treated is grasped between the grasp units 16 and 17 and the force application unit 33 applies the operation force in an amount more than or equal to a predetermined amount and the handle 11 is closed in the present exemplary variation . in a ninth exemplary variation illustrated in fig2 and 21 , opening or closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the off state ( the state illustrated in fig2 ) and the on state ( the state illustrated in fig2 ). in the present exemplary variation , the inside of the housing 6 is provided with an elastic member 76 . the selection switch 41 c is attached on the elastic member 76 . in the present exemplary variation , closing the handle 11 with respect to the grip 8 when the selection switch 41 c that is the selection member is in the off state causes the handle 11 to have contact with the elastic member 76 . further closing the handle 11 from that state causes the elastic member 76 to contract . in the present exemplary variation , when the elastic member 76 contracts by a predetermined contraction amount or more , this contraction causes the handle 11 to press the selection switch 41 c ( the switch 42 ) and thus switches the selection switch 41 c from the off state to the on state . thus , even when the handle 11 is closed , the selection switch 41 c is maintained to be in the off state unless the application of operation force in an amount more than or equal to a predetermined amount causes the elastic member 76 to contract by a predetermined contraction amount or more . thus , similarly to the seventh exemplary variation and the eighth exemplary variation , the selection switch 41 c is switched to the on state only when the object to be treated is grasped between the grasp units 16 and 17 and the force application unit 33 applies the operation force in an amount more than or equal to a predetermined amount and the handle 11 is closed in the present exemplary variation . the tenth exemplary variation illustrated in fig2 and 23 is provided with a selection button 41 and a selection switch 41 c as selection members . in the present exemplary variation , the selection button 41 is provided nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . thus , the thumb f 1 can input operation with the selection button 41 ( can press the selection button 41 ) while the grip 8 is grasped between the thumb f 1 and the palm p . the thumb f 1 switches the selection button 41 between the on state and the off state . in the present exemplary variation , the selection switch 41 c is provided nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . opening or closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in pressure from the handle 11 to the selection switch 41 c switches the selection switch 41 c between the off state and the on state . fig2 is a diagram of the configuration to detect the operating state of each of the operation buttons 31 a and 31 b , the selection button 41 , and the selection switch 41 c in the present exemplary variation . in the present exemplary variation , the operating state input with the operation button corresponding to each of the switches 35 a and 35 b ( the operation button 31 a or 31 b ) is detected in accordance with whether each of the switches 35 a and 35 b opens or closes . furthermore , the operating state input with the selection button 41 is detected in accordance with whether the switch 42 a opens or closes and the operating state input with the selection switch 41 c is detected in accordance with whether the switch 42 b placed on the selection switch 41 c opens or closes in the present exemplary variation . as illustrated in fig2 , in the present exemplary variation , the control unit 26 is connected to the switches 35 a , 35 b , and 42 a through the detection signal line 77 a . the control unit 26 is connected to the switch 35 a through the detection signal line 77 b , and connected to the switch 35 b through the detection signal line 77 b . the control unit 26 is also connected to the switch 42 b through the detection signal line 77 c . in the present exemplary variation , the switches 42 a and 42 b are electrically arranged in series each other . the detection signal lines 77 a to 77 d are a first detection signal line that transmits a detection signal ( a first detection signal ) indicating the operating state input with each of the operation buttons 31 a and 31 b to the control unit 26 , and are a second detection signal line that transmits a detection signal ( a second detection signal ) indicating the operating state input with each of the selection button 41 and the selection switch 41 c to the control unit 26 . in the present exemplary variation , when both the selection button 41 and the selection switch 41 c are in the on states , both the switches 42 a and 42 b are closed so that the detection current flows through the detection signal lines 77 a and 77 d . the flow of the detection current through the detection signal lines 77 a and 77 d switches the mode from the mode in which both the selection buttons 41 and the selection switch 41 c in the off states . thus , even when both the selection button 41 and the selection switch 41 c are in the off states and one of the selection button 41 and the selection switch 41 c is switched to the on state ( even when one of the switch 42 a and 42 b is closed ), the detection current does not flow through the detection signal lines 77 a and 77 d and thus the mode is not switched . for example , in an exemplary embodiment , the mode is switched so that the medical treatment device 1 functions as the pattern x 16 illustrated in fig5 in accordance with the operating state input with each of the selection button 41 and the selection switch 41 c . in this example , when at least one of the selection button 41 and the selection switch 41 c is in the off state , the detection current does not flow through the detection signal lines 77 a and 77 d . thus , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 . for example , even when closing the handle 11 switches the selection switch 41 c to the on state , the medical treatment device 1 operates in accordance with the operation input with the foot switch 34 unless operation is simultaneously input with both the selection button 41 and the selection switch 41 c ( unless both the selection button 41 and the selection switch 41 c are simultaneously pressed ). thus , even when the selection switch 41 c is switched to the on state , the energy used for treatment ( for example , high frequency energy or ultrasonic vibration ) is not supplied to the end effector 18 in accordance with the operation input with the operation button ( 31 a or 31 b ) unless both the selection button 41 and the selection switch 41 c are in the on states . in the present exemplary variation , for example , when closing the handle 11 switches the selection switch 41 c to the on state , and operation is simultaneously input with both the selection button 41 and the selection switch 41 c ( both the selection button 41 and the selection switch 41 c are simultaneously pressed ), the mode is switched to the mode in which the medical treatment device 1 operates in accordance with the operation input with the operation buttons 31 a and 31 b . in the embodiments and variations , the handle 11 is placed on the head side of the grip 8 . however , as an eleventh exemplary variation illustrated in fig2 and 25 , the handle 11 can be placed on the base side of the grip 8 . in the present exemplary variation , the handle 11 also opens and closes in roughly parallel to the longitudinal axis c . the grip 8 includes a grip grasp unit ( grip finger - put position ) 51 . in the present exemplary variation , the operation buttons ( the operation members ) 31 a and 31 b are placed on the surface of the head 32 of the grip 8 and the operation buttons 31 a and 31 b are placed nearer to the longitudinal axis c than the grip grasp unit 51 . thus , the operation buttons 31 a and 31 b are placed at a portion on the head side of the housing 6 . in the present exemplary variation , the grip grasp unit 51 of the grip 8 is provided with a selection button ( the selection member ) 41 . in the present exemplary variation , the selection button 41 is exposed to the outside of the external surface of the housing 6 , and placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . in the present exemplary variation , the control unit 26 causes the medical treatment device 1 to function , for example , in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection button 41 . as illustrated in fig2 , for example , in a state in which an operator holds the housing 6 and the handle 11 with the operator &# 39 ; s right hand h , the operator &# 39 ; s middle finger f 3 , ring finger f 4 and little finger f 5 are put on the grip grasp unit 51 so that the grip 8 of the housing 6 is held . then , the thumb f 1 is put on the force application unit 33 of the handle 11 so that the thumb f 1 applies operation force on the handle 11 to close the handle 11 with respect to the grip 8 . the index finger f 2 performs the operation for rotating the rotating knob 12 and inputting operation with the operation buttons 31 a and 31 b ( pressing the operation buttons 31 a and 31 b ). in the present exemplary variation , the selection button ( the selection member ) 41 is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b on the external surface of the housing 6 , and is positioned on the grip grasp unit 51 . this enables the operator to input operation with the selection button 41 ( to press the selection button 41 ) using any one of the middle finger f 3 , ring finger f 4 , and little finger f 5 put on the grip grasp unit 51 of the grip 8 . the middle finger f 3 , ring finger f 4 , or little finger f 5 switches the selection button 41 between the on state and the off state . thus , the thumb f 1 and index finger f 2 used for at least one of the operations for opening or closing the handle 11 , for rotating the rotating knob 12 , and for inputting operation with the operation buttons 31 a and 31 b are not used for inputting operation with the selection button 41 . thus , it is unnecessary to change the positions and postures of the thumb f 1 and index finger f 2 and to hold the housing 6 and the handle 11 again with the right hand h in order to switch the selection button 41 between the on state and the off state . thus , in the present exemplary variation , the operability for opening or closing the handle 11 , for rotating the rotating knob 12 , and for inputting operation with the operation buttons 31 a and 31 b is secured and the operability for inputting operation with the selection button 41 is also secured . in a twelfth exemplary variation illustrated in fig2 , the base side of the grip 8 is provided with the handle 11 and the base surface 52 of the grip 8 is provided with the selection switch 41 c ( the switch 42 ). in the present exemplary variation , the selection switch 41 c is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b . then , the selection switch 41 c is exposed to the outside of the external surface of the housing 6 . in the present exemplary variation , the selection switch 41 c is placed at a position at which the handle 11 can press the selection switch 41 c so that opening or closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the on state and the off state ( in other words , the operating state input with the selection switch 41 c is switched ). in the present exemplary variation , the control unit 26 causes the medical treatment device 1 to function , for example , in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection switch 41 c . in the present exemplary variation , the selection switch ( the selection member ) 41 c is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b on the housing 6 , and placed on the base surface 52 of the grip 8 . thus , opening or closing the handle 11 with respect to the housing 6 can vary the pressure from the handle 11 on the selection switch 41 c . in other words , in the present exemplary variation , opening or closing the handle 11 immediately switches the selection switch 41 c between the on state and the off state . in the present exemplary variation , the housing 6 and the handle 11 are held as described in the eleventh exemplary variation ( see fig2 ). thus , it is unnecessary to change the positions and postures of the thumb f 1 and index finger f 2 and to hold the housing 6 and the handle 11 again with the right hand h in order to input operation with the selection switch 41 c because opening or closing the handle 11 immediately switches the selection switch 41 c between the on state and the off state . thus , in the present exemplary variation , the operability for opening and closing the handle 11 , for rotating the rotating knob 12 , and for inputting operation with the operation buttons 31 a and 31 b is secured and the operability for inputting operation with the selection switch 41 c is also secured . in the embodiments and variations , the handle 11 opens or closes in roughly parallel to the longitudinal axis c . for example , in a thirteenth exemplary variation as illustrated in fig2 and 28 , the handle 11 can open or close in a direction crossing ( roughly perpendicular to ) the longitudinal axis c . in the present exemplary variation , the housing 6 includes a housing body 7 extending along the longitudinal axis c , and a grip 8 extending from the housing body 7 in a direction crossing the longitudinal axis c . the handle 11 is placed opposite to the grip 8 while the longitudinal axis c is centered . the grip 8 includes a grip grasp unit ( the grip finger - put position ) 55 , and an inclined surface 56 placed nearer to the head side of the grip 8 than the grip grasp unit 55 . the inclined surface 56 faces the head side of the grip 8 . in the present exemplary variation , the operation buttons ( the operation members ) 31 a and 31 b are provided on the inclined surface 56 of the grip 8 . the operation buttons 31 a and 31 b are placed nearer to the head side of the grip 8 than the grip grasp unit 55 . thus , the operation buttons 31 a and 31 b are placed at a portion on the head side of the housing 6 . in the present exemplary variation , the grip grasp unit 55 of the grip 8 is provided with the selection button ( the selection member ) 41 . in the present exemplary variation , the selection button 41 is exposed to the outside of the external surface of the housing 6 and is placed nearer to the base side of the grip 8 than the operation buttons 31 a and 31 b . in the present exemplary variation , the control unit 26 causes the medical treatment device 1 to function , for example , in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state input with the selection button 41 . as illustrated in fig2 , for example , in the state in which the right hand h holds the housing 6 and the handle 11 , the middle finger f 3 , ring finger f 4 , and little finger f 5 are put on the grip grasp unit 55 so that the grip 8 of the housing 6 are held . the thumb f 1 is put on the force application unit 33 of the handle 11 so that the thumb f 1 applies operation force on the handle 11 to close the handle 11 with respect to the grip 8 . the index finger f 2 performs the operation for rotating the rotating knob 12 , or inputting operation with the operation buttons 31 a or 31 b ( pressing operation the operation buttons 31 a or 31 b ). in the present exemplary variation , the selection button ( the selection member ) 41 is placed near to the base side of the housing 6 than the operation buttons 31 a and 31 b on the external surface of the housing 6 , and placed on the grip grasp unit 55 . this enables the operator to input operation with the selection button 41 ( to press the selection button 41 ) using any one of the middle finger f 3 , ring finger f 4 , and little finger f 5 put on the grip grasp unit 55 of the grip 8 . the middle finger f 3 , ring finger f 4 and little finger f 5 switch the selection button 41 between the on state and the off state . thus , the thumb f 1 and index finger f 2 used for at least one of the operations for opening and closing the handle 11 , for rotating the rotating knob 12 , and for inputting operation with the operation buttons 31 a and 31 b are not used for inputting operation with the selection button 41 . thus , it is unnecessary to change the positions and postures of the thumb f 1 and index finger f 2 and to hold the housing 6 and the handle 11 again with the right hand h in order to switch the selection button 41 between the on state and off state in treatment . thus , in the present exemplary variation , the operability for opening and closing the handle 11 , for rotating the rotating knob 12 , and for inputting operation with the operation buttons 31 a and 31 b is secured and the operability for inputting operation with the selection button 41 is also secured . in a fourteenth exemplary variation illustrated in fig2 , the handle 11 opens and closes in a direction crossing ( roughly perpendicular to ) the longitudinal axis c , and a portion 57 facing the handle 11 on the external surface of the housing 6 is provided with the selection switch 41 c ( the switch 42 ). in the present exemplary variation , the selection switch 41 c is placed nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b ( the inclined surface 56 ). the selection switch 41 c is exposed to the outside of the external surface of the housing 6 . in the present exemplary variation , the selection switch 41 c is placed at a position at which the handle 11 can press the selection switch 41 c so that opening or closing the handle 11 with respect to the housing 6 varies the pressure from the handle 11 on the selection switch 41 c . the variation in the pressure from the handle 11 on the selection switch 41 c switches the selection switch 41 c between the on state and the off state ( in other words , the variation switches the operating states input with the selection switch 41 c ). in this exemplary variation , the control unit 26 causes the medical treatment device 1 to function , for example , in one of the patterns x 1 to x 16 , xa 1 to xa 6 , xa 9 , xa 11 to xc 11 , and xa 12 to xc 12 illustrated in fig5 in accordance with the operating state on the selection switch 41 c . in the present exemplary variation , the selection switch ( the selection member ) 41 c is placed near to the base side of the housing 6 than the operation buttons 31 a and 31 b on the housing 6 , and placed at a portion 57 facing the handle 11 on the external surface of the housing 6 . opening or closing the handle 11 with respect to the housing 6 can vary the pressure from the handle 11 on the selection switch 41 c . in other words , in the present exemplary variation , opening or closing the handle 11 immediately switches the selection switch 41 c between the on state and the off state . in the present exemplary variation , the housing 6 and the handle are held as described in the thirteenth exemplary variation ( see fig2 ). thus , because opening or closing the handle 11 immediately switches the selection switch 41 c between the on state and the off state in the present exemplary variation , it is unnecessary to change the positions and postures of the thumb f 1 and index finger f 2 and to hold the housing 6 and the handle 11 again with the right hand h in order to input operation with the selection switch 41 c . accordingly , in the present exemplary variation , the operability for opening and closing the handle 11 , rotating the rotating knob 12 , and inputting the operation buttons 31 a and 31 b is secured and the operability for inputting operation with the selection switch 41 c is also secured . in a fifteenth exemplary variation illustrated in fig3 to 31d , a lever 60 is rotatably attached to the housing 6 . similarly to the first embodiment , the handle 11 is placed nearer to the head side of the housing 6 than the grip 8 in the present exemplary variation . the handle 11 moves in roughly parallel to the longitudinal axis c . similarly to the first embodiment , the housing 6 is provided with the operation buttons ( the operation members ) 31 a and 31 b and the selection button ( the selection member ) 41 . in the present exemplary variation , the lever 60 rotates around a rotation axis r 2 that is roughly parallel to the width direction of the housing 6 ( the direction perpendicular to the drawing paper of fig3 ). the lever 60 rotates between a position at which the lever 60 can press the operation button 31 a ( the position indicated with a solid line in fig3 ) and a position at which the lever 60 can press the operation button 31 b ( the position indicated in a dashed line in fig3 ). note that the rotation axis r 2 of the lever 60 passes through a position nearer to the base side of the housing 6 than the operation buttons 31 a and 31 b and nearer to the head side of the housing 6 than the selection button 41 . the lever 60 includes a lever supporting shaft 61 through which the rotation axis r 2 passes , a first lever extension portion 62 extending from the lever supporting shaft 61 toward the head side of the housing 6 ( the side on which the operation buttons 31 a and 31 b are positioned ), and a second lever extension portion 63 extending from the lever supporting shaft 61 toward the base side of the housing 6 ( the side on which the selection button 41 is positioned ). in order to input operation with the operation button 31 a , rotating the lever 60 moves the first lever extension portion 62 to a position at which the first lever extension portion 62 can have contact with the operation button 31 a . meanwhile , the second lever extension portion 63 is positioned at a position at which the second lever extension portion 63 can have contact with the selection button 41 . in order to input operation with the operation button 31 b , rotating the lever 60 moves the first lever extension portion 62 to a position at which the first lever extension portion 62 can have contact with the operation button 31 b . meanwhile , the second lever extension portion 63 is positioned at a position at which the second lever extension portion 63 can have contact with the selection button 41 . as illustrated in fig3 a , even when the lever 60 is positioned at a position at which the lever 60 can have contact with the operation button ( 31 a or 31 b ) and the selection button 41 , the first lever extension portion 62 does not have contact with the operation button ( 31 a or 31 b ) and the second lever extension portion 63 does not have contact with the selection button 41 unless an external force ( the pressing force from the operator ) acts on the lever 60 . thus , in the state illustrated in fig3 a , operation is not input with the operation button ( 31 a or 31 b ) and the selection button 41 . for example , when the operation button ( 31 a or 31 b ) and the selection button 41 are momentary ones , the operation button ( 31 a or 31 b ) and the selection button 41 are in the off states . as illustrated in fig3 b , when the lever 60 is positioned at a position in which the lever 60 can have contact with the operation button ( 31 a or 31 b ) and the selection button 41 and an external force ( the pressing force from the operator ) acts on the first lever extension portion 62 ( the arrow τ 1 in fig3 b ), the first lever extension portion 62 has contact with the operation button ( 31 a or 31 b ). meanwhile , the second lever extension portion 63 does not have contact with the selection button 41 . thus , in the state illustrated in fig3 b , operation is input with the operation button ( 31 a or 31 b ) while operation is not input with the selection button 41 . thus , for example , when the operation button ( 31 a or 31 b ) and the selection button 41 are momentary ones , the operation button ( 31 a or 31 b ) is in the on state and the selection button 41 is in the off state . on the other hand , when an external force ( the pressing force from the operator ) acts on the second lever extension portion 63 ( the arrow τ 2 in fig3 c ) in a state in which the lever 60 is positioned at a position in which the lever 60 can have contact with the operation button ( 31 a or 31 b ) and the selection button 41 as illustrated in fig3 c , the second lever extension portion 63 has contact with the selection button 41 . meanwhile , the first lever extension portion 62 does not have contact with the operation button ( 31 a or 31 b ). thus , in the state as illustrated in fig3 c , operation is input with the selection button 41 and operation is not input with the operation button ( 31 a or 31 b ). thus , for example , when the operation button ( 31 a or 31 b ) and the selection button 41 are momentary ones , the selection button 41 is in the on state and the operation button selection button 41 is in the off state . when an external force ( the pressing force from the operator ) acts on the lever supporting shaft 61 ( the arrow t 3 in fig3 d ) in a state in which the lever 60 is positioned at a position at which the lever 60 can have contact with the operation button ( 31 a or 31 b ) and the selection button 41 as illustrated in fig3 d , the first lever extension portion 62 has contact with the operation button ( 31 a or 31 b ) and the second lever extension portion 63 has contact with the selection button 41 . thus , in the state illustrated in fig3 d , operation is input with the operation button ( 31 a or 31 b ) and operation is input with the selection button 31 . thus , for example , when the operation button ( 31 a or 31 b ) and the selection button 41 are momentary ones , the operation button ( 31 a or 31 b ) and the selection button 41 are in the on states . as described above , in the present exemplary variation , the provision of the lever 60 can makes it easy to simultaneously input operation with both the operation button ( 31 a or 31 b ) and the selection button 41 . an indicator ( not illustrated ) that indicates to the operator whether the selection member ( 41 , 41 a , 41 b , or 41 c ) is in the on state or the off state can be provided in an exemplary variation . the indicator can be provided on the medical treatment tool 2 ( for example , on the housing 6 ) or on the control device 3 . alternatively , the indicator can be provided separately from the medical treatment tool 2 and the control device 3 . the operation of the indicator is controlled , for example , by the control unit 26 . in an embodiment , the indicator is a light generation member such as an led that generates light when the selection member ( 41 , 41 a , 41 b , or 41 c ) in one of the on state or the off state . in another exemplary embodiment , the indicator is , for example , a protrusion or lever provided on the housing . in this example , the switching of the selection member ( 41 , 41 a , 41 b , or 41 c ) between the on state and the off state varies the protrusion amount of the protrusion or the orientation of the lever . in other words , the shape of the indicator varies . in another exemplary embodiment , a member that changes , for example , the texture when the selection member ( 41 , 41 a , 41 b , or 41 c ) is clicked , the stroke when the selection member ( 41 , 41 a , 41 b , or 41 c ) is switched , or the amount of force necessary to switch the selection member ( 41 , 41 a , 41 b , or 41 c ) is provided as the indicator . in this example , the switching of the selection member ( 41 , 41 a , 41 b , or 41 c ) between the on state and the off state varies the texture , stroke , or the amount of force . in the embodiments and variations , the medical treatment device ( 1 ) is provided with the housing ( 6 ) that includes the base and head and includes the housing body ( 7 ) extending along the longitudinal axis ( c ), the handle ( 11 ) capable of opening and closing with respect to the housing ( 6 ), the end effector ( 18 ) placed nearer to the head side of the medical treatment device ( 1 ) than the housing ( 6 ) and used to treat an object to be treated . a portion on the head side of the housing ( 6 ) is provided with the operation member ( 31 a or 31 b ), a portion nearer to the base side of the housing ( 6 ) than the operation member ( 31 a or 31 b ) is provided with the selection member ( 41 , 41 a , 41 b , 41 c , or 41 and 41 c ). operation for causing the medical treatment device ( 1 ) to function is input with the operation member ( 31 a or 31 b ). the operating state input with selection member ( 41 , 41 a , 41 b , 41 c , or 41 and 41 c ) is switched . the control unit ( 26 ) can cause the medical treatment device ( 1 ) to function in a plurality of modes and the control unit ( 26 ) detects the operating state input with the selection member ( 41 , 41 a , 41 b , 41 c , or 41 and 41 c ). then , the control unit ( 26 ) selects a mode in which the medical treatment device ( 1 ) functions from the modes in accordance with the result of detection of the operating state input with the selection member ( 41 , 41 a , 41 b , 41 c , or 41 and 41 c ). the configurations of the embodiments and variations can properly be changed or partially combined as long as the configuration includes the components described above . the embodiments and variations of the present invention have been described above . needless to say , the present invention is not limited to the embodiments and variations and can variously be changed without departing from the scope of the invention .
a control device having : one or more processors configured to : receive a first signal indicating one of a plurality of inputs of a first type received by a first input device ; receive a second signal indicating one of a plurality of inputs of a second type received by a second input device ; select a selected mode from one or more modes of a respective one or more treatment devices based on a combination of the first signal and the second signal ; and output a control signal for controlling the one or more treatment devices in accordance with the selected mode .