referring to fig1 - 3 , wherein a self - operated mini therapeutic device for venous thrombus prophylaxis in accordance with one aspect of the present invention is shown , which comprises : an air cushion 4 has a non - elastic outer layer 13 adhered with a flexible inner liner , the air cushion 4 is interiorly formed with air passage , it can be a single air passage , double air passages or multiple passages , the air passages are parallel with each other , or formed in the shape of “ z ”. the width of the respective air passages is approximately 50 - 300 mm , on the surface of the air passages is evenly provided with tiny magnets . the magnetic field strength of each tiny magnet is approximately 2 - 120 t . the longitudinal and the lateral distances between each adjoining magnets are approximately 10 - 30 mm . an inflating and extracting mechanism includes a diverting valve 6 , a mini air pump 8 , a baroceptor 9 and a relief valve 10 which are connected to a multi - way connector 7 via pipes 5 . the max input pressure of the inflating and extracting mechanism is approximately 20 - 300 mmhg . a passage 1 or 3 is connected to the diverting valve 6 , with the pipes 5 the diverting valve 6 is connected to the mini air pump 8 , the baroceptor 9 and the relief valve 10 via the multi - way connector 7 . a control circuit 11 is used to control the mini air pump 8 , the baroceptor 9 , the relief valve 10 and the diverting valve 6 . the control circuit 11 is provided with power source and switch 12 . when the pressure of the air in the air passages 1 or 3 inflated by the mini air pump 8 reaches a desired value , the baroceptor 9 will send signals to the control circuit 11 , then the control circuit 11 will accordingly control the diverting valve 6 so as to make the mini air pump 8 inflate another air passage . in case that the air cushion 4 is provided with two air passages , the diverting valve 6 can work as a relief valve . if the air cushion 4 is provided with more than two air passages , the air passages can be additionally equipped with the relief valve 10 , which is under the control of the control circuit 11 to relieve or maintain the air pressure in the respective air passages . the pressure reduction of the air passages 1 or 2 or other respective air passages can be fulfilled through natural leakage after a period of inflation . the control circuit 11 includes an oscillator comprised of a set of programming switches and a general purpose integral circuit , a nand gate and an output circuit . the control circuit 11 can use program to control the speed of the air inflation / extraction , the sequence of inflation / extraction of the respective air passages , and the working period of the self - operated mini therapeutic device for venous thrombus prophylaxis . to prolong the service life of battery , a detector for detecting the movements of limbs and trunk ( muscular movements ) can be used to signal to stop the self - operated mini therapeutic device for venous thrombus prophylaxis whenever the user is walking or doing other activities . to make it more adaptive to physiological requirements , the self - operated mini therapeutic device for venous thrombus prophylaxis can be additionally equipped with a monitoring equipment which serves to monitor pulses and blood pressure , and the detected data and parameters can be inputted to the control circuit as a basis for the mini therapeutic device to decide the mode of operations . fig4 is an operation block diagram of the self - operated mini therapeutic device for venous thrombus prophylaxis in accordance with one aspect of the present invention . fig5 is a circuit diagram of the self - operated mini therapeutic device for venous thrombus prophylaxis in accordance with one aspect of the present invention , wherein the control circuit comprises dc power supply of 2 . 5 - 6v , oscillating circuit , amplifier circuit , programmer , kinesthetic receptor and switch . a control circuit consisting of a 555 ic , a set of programmable switches ( k 1 , k 2 , k 3 , . . . . ki ), nand gate and output is used to drive the load rl , the load rl can be mini air pump or relay ( with the relay to drive the mini pump ). when the switch k is closed , the output end of the ic is at high electric level , and a current - limiting resistor r 4 and an inverter 1 are used to trigger the input end of a nand 2 of the ic 1 . at this moment , if pressure is not at a predetermined level , position p is at high electric level , thereby the output end t of the control circuit is in fully conducted state , such that the load rl is in operating state . after a period of operation of the load rl , the pressure will reach the predetermined level , the position p is at a low electric level , the output end t of the control circuit is in a cut - off state , and thus the load rl will stop . power resource vcc can be dry battery . with this optimized electrical circuit , the work time of the battery can be prolonged up to several weeks . according to real needs , period of inflation / extraction cycle can be changed from once per minute to once per 10 - 20 minutes with the change of the resistance of the programmable switches . in operation , with the mini air pump , the pressure in the air passages can reach a level that is high enough to increase the venous blood return . through proper adjustment or improvement of the electric circuit , the max pressure can be adjusted . the control circuit of the present invention employs a controllable multi - way diverting valve to realize faster air extraction and flexible multiple - passage air extraction . the air pressure in the air passages can be maintained for a period of time according to needs . the operation of the self - operated mini therapeutic device for venous thrombus prophylaxis in accordance with the present invention is further explained in fig6 . the power is turned on at time of 18 , and the programmable switches in fig5 are used to adjust the frequency . during the first period 17 , the mini air pump 8 inflates the respective air passages for a first time 20 until the baroceptor 9 detects a predetermined max pressure ( at the end of the time 20 ), the circuit starts to count time , that means a first lag phase 14 is started . the diverting valve 6 and the relief valve 10 operate in a coordinate manner during the first lag phase 14 , so as to relieve or maintain the air pressure in the respective air passages . time count stops at the moment the first lag phase 14 is terminated , then starts a second period 19 , the mini air pump 8 operates for a second time 15 . in the second period 19 , under the control of programmable circuit , the mini air pump 8 starts to choicely inflate the air passages which are selected by the diverting valve 6 until all the air passages in the air cushion 4 to be inflated have been inflated , such that an inflation cycle is finished , and then the next inflation cycle starts until the power is off . the maintenance or relief of the air pressure in the respective air passages can be achieved by the coordination between the relief valve 10 and the diverting valve 6 that is controlled by the programmable circuit . an extreme condition is that with a predetermined program , all the respective air passages in the air cushion are inflated to a predetermined pressure and then the air passages are released in turn , that is to say , with a more complicated programmable circuit or microprocessor , the inflation speed , the time delay of pressure - release or the periodical change between the air inflation and release can be adjusted synchronously or respectively according to their corresponding time functions . therefore the self - operated mini therapeutic device for venous thrombus prophylaxis in accordance with the present invention is not only conductive to specific treatment but also helpful to the service life of the battery . as shown in fig7 , wherein the air cushion 4 is attached to a user &# 39 ; s shank 23 and fixed with a nylon buckle 21 , the air passages 1 or 3 are connected to a control box 22 for air path and circuit . the diverting valve 6 , the inflating and extracting mechanism and the circuit for controlling them are enclosed in the control box 22 . a rotary knob is defined on the control box 22 , when the power is turned on , the mini air pump 8 in the control box 22 will inflate or extract the respective air passages , so as to massage the shrank with wave pressure , meanwhile a magnet 2 in the air cushion also will have effect on the shrank . referring to fig8 , wherein the air cushion in accordance with another embodiment of the present invention is disposed in the user &# 39 ; s shoe 24 at a position corresponding to the sole and the side of the foot . the mini air pump 8 and the control box 22 can be positioned on the front uppers of the shoe and connected to the air passages 1 via the pipe 5 . referring to fig9 , wherein the air cushion with multiple air passages in accordance with another embodiment of the present invention is fixed to pants . in this embodiment , the air passages 1 are respectively located at the positions of the buttock , the thigh and the shank . in consideration of limitation of the position and the power capacity , wherein the air cushion at the positions of the buttock , the left thigh and shank , and the right thigh and shank are connected to three air paths via three pipes 5 and controlled by the control box 22 . obviously , if pneumatic component parameter can meet the desired power requirements , they can be combined together , the arrangements of the air paths and the magnets include but are not limited to the positions as shown in figures . in real operation , the user only needs to fasten the nylon buckle 21 to desired parts of the body and turn the power on , and then the self - operated mini therapeutic device for venous thrombus prophylaxis works immediately . while we have shown and described various embodiments in accordance with the present invention , it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention .
a self - operated mini therapeutic device for venous thrombus prophylaxis , including plural “ z ” shape air passages and plural magnets defined in an air cushion , a mouth of the respective air passages connected to diverting valve via pipes , the diverting valve connected to an inflating and extracting mechanism via the pipes , so as to form air paths for inflation and extraction of the respective air passages in the air cushion , a control circuit employed to control the diverting valve . the self - operated mini therapeutic device can use pressure wave and magnetic stimulation to prevent and treat venous thrombus .