particular embodiments of the present disclosure are described hereinbelow with reference to the accompanying drawings ; however , it is to be understood that the disclosed embodiments are merely exemplary of the disclosure and may be embodied in various forms . well - known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail . therefore , specific structural and functional details disclosed herein are not to be interpreted as limiting , but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure . like reference numerals may refer to similar or identical elements throughout the description of the figures . as shown in the drawings and described throughout the following description , as is traditional when referring to relative positioning on a surgical instrument , the term “ proximal ” refers to the end of the apparatus which is closer to the user and the term “ distal ” refers to the end of the apparatus which is further away from the user . electromagnetic energy is generally classified by increasing energy or decreasing wavelength into radio waves , microwaves , infrared , visible light , ultraviolet , x - rays and gamma - rays . as used herein , the term “ microwave ” generally refers to electromagnetic waves in the frequency range of 300 megahertz ( mhz ) ( 3 × 10 8 cycles / second ) to 300 gigahertz ( ghz ) ( 3 × 10 11 cycles / second ). as used herein , the term “ rf ” generally refers to electromagnetic waves having a lower frequency than microwaves . fig2 - 3 show an electrosurgical pencil constructed in accordance with an embodiment of the present disclosure is shown generally as 100 . electrosurgical pencil 100 includes an elongated housing 102 configured and adapted to support a blade receptacle 104 at a distal end 103 thereof which , in turn , receives a replaceable electrocautery end effector 106 in the form of a loop and / or blade therein . electrocautery blade 106 is understood to include a planar blade , a loop , a needle and the like . a distal end portion 108 of blade 106 extends distally from receptacle 104 while a proximal end portion of blade 106 is retained within distal end 103 of housing 102 . electrocautery blade 106 may be fabricated from a conductive type material , such as , for example , stainless steel , or is coated with an electrically conductive material . the electrosurgical pencil also includes a power board “ p ”, a wireless communication board “ w ”, and a controller board “ c ”. as shown , electrosurgical pencil 100 is coupled to a return pad “ r ” via a cable 112 . cable 112 includes a transmission wire which electrically interconnects return pad “ r ” with return port 111 of electrosurgical pencil 100 . alternatively , the return pad “ r ” can be connected to the generator “ g ”. for the purposes herein , the terms “ switch ” or “ switches ” includes electrical actuators , mechanical actuators , electro - mechanical actuators ( rotatable actuators , pivotable actuators , toggle - like actuators , buttons , etc .) or optical actuators . electrosurgical pencil 100 includes at least one activation switch , e . g ., three activation switches 124 a - 124 c , each of which are supported on an outer surface 107 of housing 102 . each activation switch 124 a - 124 c is operatively connected to a respective switch 126 a - 126 c which , in turn , controls the transmission of rf electrical energy supplied from a power board “ p ” and an electrosurgical generator “ g ” to electrosurgical blade 106 . more particularly , switches 126 a - 126 c are electrically coupled to control loop 116 and are configured to close and / or complete control loop 116 , which causes the controller board “ c ” to send an instruction to the wireless communication board “ w ”. the wireless communication board “ w ” sends a wireless signal using antenna 140 to the electrosurgical generator “ g ” to generate an rf energy field 200 . the rf energy field 200 causes a current to flow though an inductor 150 connected to power board “ p ”. as the current flows through inductor 150 , energy is transmitted to electrocautery blade 106 to perform surgical operation . in an alternative embodiment , the rf energy field 200 can be continuously in an “ on ” mode by selecting a switch on the electrosurgical device 100 or on the electrosurgical generator “ g ”. additionally , switches 124 a - 124 c can be used to supply energy in an operational mode selected by the user without sending information to the electrosurgical generator “ g ”, where the power board “ p ” conditions the rf signal from inductor 150 into the selected operational mode . the operational mode can be cut , ablate , coagulate , or seal depending on the surgical instrument being employed . electrosurgical pencil 100 further includes one or more intensity controllers 128 a and / or 128 b , each of which are slidingly supported in guide channels 130 a , 130 b , respectively , which are formed in outer surface 107 of housing 102 . each intensity controller 128 a and 128 b is a slide - like potentiometer . each intensity controller 128 a and 128 b and respective guide channel 130 a and 130 b may be provided with a series of cooperating discreet or detented positions defining a series of positions to allow easy selection of output intensity from a minimum amount to a maximum amount . the series of cooperating discreet or detented positions also provide the surgeon with a degree of tactile feedback . one of the series of positions for intensity controllers 128 a , 128 b may be an “ off ” position ( i . e ., no level of electrical or rf energy is being transmitted ). intensity controllers 128 a and 128 b are configured and adapted to adjust one of the power parameters ( e . g ., rf energy field , voltage , power and / or current intensity ) and / or the power verses impedance curve shape to affect the perceived output intensity . as shown in fig3 , electrosurgical pencil 100 may include a controller board “ c ”, a wireless communication board “ w ”, and a power board “ p ” within housing 102 . controller board “ c ” receives inputs from the various switches , intensity controller , nubs , potentiometers or the like that may be disposed in housing 102 and outputs a signal to wireless communication board “ w ” that , in turn , sends a wireless signal though antenna 140 to the generator “ g ” to generate rf energy field 200 from a generator side inductor 160 connected to a power source 430 . an inductor 150 is connected to a power board “ p ”, and the rf energy field 200 induces a current to flow through inductor 150 . the power board “ p ” then sends an energy signal to electrosurgical blade 106 . the type of energy signal sent to the electrosurgical blade 106 may be controlled through the controller board “ c ” using switches 124 a - 124 c and / or 128 a - 128 b . alternatively , the electrosurgical pencil 100 may include a rechargeable battery ( not shown ). the battery may be recharged when rf field 200 induces a current to flow through inductor 150 . the battery then supplies the energy signal through the power board “ p ” to the electrosurgical blade 106 . in another embodiment , the electrosurgical pencil 100 may include a capacitor ( not shown ). the capacitor may be charged when rf field 200 induces a current to flow through inductor 150 . the capacitor then supplies the energy signal through the power board “ p ” to the electrosurgical blade 106 . for example , the capacitor may take 20 seconds to charge and provide a 20 second burst of electrical energy to the power board “ p ” to supply to the electrosurgical blade 106 . [ please give a size range of capacitor that may be possible to use ] fig4 discloses a schematic of a wireless rf system 400 to power an electrosurgical device 100 or 510 ( see fig2 and 5 a , respectively ). an electrosurgical device 405 , such as electrosurgical device 100 or 510 , includes a control interface 450 , inductive power circuitry 440 , an inductor 150 , wireless communication circuitry 460 , and / or a device electrode or seal plate 470 . a generator “ g ” includes at least an inductor 160 connected to a power source 430 . the inductor 160 may be a single inductor with an inductance between about xx and xx [ please give a range for the inductance ]. alternatively , inductor 160 may be two or more inductors connected in series or parallel . the inductor 160 generates an rf energy field 200 . [ what is the formula for calculating size of rf energy field and what is the size range of the rf energy field ] the rf energy field 200 causes a current to flow through inductor 150 . the inductor 150 is connected to inductive power circuitry 440 , where the inductive power circuitry filters and / or conditions the rf signal . the rf signal may be conditioned based on the selected mode . the rf signal is then sent to the electrode 106 ( see fig2 ) or seal plate 528 ( see fig5 a ) of the device . the control interface 450 is an interface between an operator and the device 405 . the control interface 450 includes one or more switches , such as switches 124 a - 124 c , that allow the operator to select the mode for operating the device 405 . the control interface 450 is connected to the wireless communication circuitry 460 . the wireless communication circuitry 460 relays the mode selected from the control interface 450 over the wireless communication field 410 to data port 420 in the generator “ g ”. the generator “ g ” then operates in the mode selected by the operator . the mode may be continuously on , selectably on , cut , seal , ablate , or coagulate . for example , the generator “ g ” may provide a rf field 200 with a pulsed waveform , when the surgeon is sealing tissue with the device 10 . alternatively , the generator “ g ” generates the rf field 200 , and the power circuitry 440 conditions an rf signal from the inductor 150 into a pulsed waveform for sealing tissue . the wireless communication board 460 replaces the signal wires needed in the prior art to communicate with the generator “ g ”. the wireless communication circuitry 460 may include a battery ( not shown ) to allow the wireless communication circuitry to send a signal to the generator “ g ” before the generator “ g ” generates the rf field 200 that induces power in the inductive power circuitry 440 . with reference to fig5 a and 5b , an illustrative embodiment of a wireless electrosurgical apparatus , e . g ., a bipolar forceps 510 ( forceps 510 ) is shown . forceps 510 is wirelessly connected to electrosurgical generator “ g ” through rf field 200 for performing an electrosurgical procedure . the electrosurgical procedure may include sealing , cutting , cauterizing coagulating , desiccating , and fulgurating tissue all of which may employ rf energy . the electrosurgical generator “ g ” may be configured for monopolar and / or bipolar modes of operation and may include or be in operative communication with a system ( not shown ) that may include one or more processors in operative communication with one or more control modules that are executable on the processor . the control module ( not explicitly shown ) may be configured to instruct one or more modules to transmit electrosurgical energy , which may be in the form of a wave or signal / pulse to the forceps 10 . forceps 510 is shown configured for use with various electrosurgical procedures and generally includes a housing 520 , a rotating assembly 580 and a trigger assembly 570 . for a more detailed description of the rotating assembly 80 , trigger assembly 570 , reference is made to commonly - owned u . s . patent application ser . no . 11 / 595 , 194 filed on nov . 9 , 2006 , now u . s . patent publication no . 2007 / 0173814 . with continued reference to fig5 a and 5b , forceps 510 includes a shaft 512 that has a distal end 514 configured to mechanically engage an end effector assembly 590 operably associated with the forceps 510 and a proximal end 516 that mechanically engages the housing 520 . in the drawings and in the descriptions that follow , the term “ proximal ,” as is traditional , will refer to the end of the forceps 510 which is closer to the user , while the term “ distal ” will refer to the end that is farther from the user . handle assembly 530 includes a fixed handle 550 and movable handle 540 . in one particular embodiment , fixed handle 550 is integrally associated with housing 520 and handle 540 is movable relative to fixed handle 550 for effecting movement of one or more components , e . g ., a drive wire 533 , operably associated with a drive assembly 534 ( fig5 b ) via one or more suitable mechanical interfaces , e . g ., a linkage interface , gear interface , or combination thereof . drive assembly 534 is in operative communication with handle assembly 530 ( see fig5 a and 5b ) for imparting movement of one or both of a pair of jaw members 525 , 535 of end effector assembly 590 . the drive assembly 534 may include a compression spring ( not shown ) or a drive wire 533 to facilitate closing the jaw members 525 and 535 . drive wire 533 is configured such that proximal movement thereof causes the movable jaw member , e . g ., jaw member 535 , and operative components associated therewith , e . g ., a seal plate 528 , to “ flex ” or “ bend ” inwardly substantially across a length thereof toward the non - movable jaw member , e . g ., jaw member 525 . with this purpose in mind , drive rod or wire 533 may be made from any suitable material and is proportioned to translate within the shaft 512 . in the illustrated embodiments , drive wire 533 extends through the shaft 512 past the distal end 514 , see fig5 a for example . fig6 is a flow diagram of process 600 for operating a device , such as 100 or 510 , within a wireless rf system . the process 600 starts at step 605 , with an operator pressing a switch , such as 124 a - 124 c or 570 , on the handheld device 100 or 510 to select a mode of operation at step 610 . an instruction specifying the mode of operation is sent to the generator “ g ” from the wireless communication board “ w ” to generate the rf energy field 200 according to the specified mode of operation at step 620 . the generator “ g ” generates the rf field at step 630 using inductor 160 . the rf field 200 induces , in step 640 , a current to flow across inductor 150 . the power board “ p ” conditions the rf signal produced from inductor 150 based on the requested operational mode at step 645 . the power board “ p ” then supplies the rf signal to the electrode , seal plate , or other end effector assembly at step 650 . when the operator completes the procedure , the operator depresses the switch , such as 124 a - 124 c or 570 , on the hand held device at step 660 . the process ends at step 680 , when the generator “ g ” receives and executes an instruction sent from the wireless communication board “ w ” instructing the generator “ g ” to stop generating the rf field 200 at step 670 . while several embodiments of the disclosure have been shown in the drawings , it is not intended that the disclosure be limited thereto , as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise . therefore , the above description should not be construed as limiting , but merely as exemplifications of particular embodiments . those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto .
a system and method for wirelessly powering an electrosurgical device using a generator to generate a radio frequency energy field . a switch on the electrosurgical device sends a wireless signal to the generator , where the generator allows a current to pass through an inductive coil to generate the rf energy field . the rf energy field induces a current to flow across an inductive coil within the electrosurgical device . the current flow is then processed through a rf conditioning circuit and outputted to the end effector assembly of the device .