Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3870047 A
Publication typeGrant
Publication date11 Mar 1975
Filing date12 Nov 1973
Priority date12 Nov 1973
Publication numberUS 3870047 A, US 3870047A, US-A-3870047, US3870047 A, US3870047A
InventorsDonald I Gonser
Original AssigneeDentsply Res & Dev
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrosurgical device
US 3870047 A
Abstract
An electrosurgical device in which high frequency electrical energy powers a cutting electrode. Radio frequency energy is set up in a driver coil and a driven coil mounted in a handpiece. The driver coil energizes the driven coil to energize a surgical electrode connected to one end of the driven coil. Connection between the source of radio frequency energy and the driver coil includes a circuit in which condensers and impedances are so connected that, if there is a failure of the condensers, energy is dissipated. Sonic warning signals indicate production of cutting, coagulating, and blended currents.
Images(3)
Previous page
Next page
Description  (OCR text may contain errors)

O United States Patent 1111 3,870,047

Gonser Mar. 11, 1975 [54] ELECTROSURGICAL DEVICE FOREIGN PATENTS OR APPLICATIONS Inventori Donald GMS", Forest Park Ohio 171,157 10/1951 Germany l28/303.l3

[73] Assignee: Dentsply Research and Development Corporation Milford, Del Primary Examzner-Rwhard A. Gaudet Assistant Exammer-Lee S. Cohen [22] Flled? 1973 Attorney, Agent, or Firm-James W. Pearce; Roy F. [21] AppL N02 414,646 Schaeperklaus; J. William Berkstresser [57] ABSTRACT [52] 'g f jig An electrosurgical device in which high frequency [51] l g 3 5 electrical energy powers a cutting electrode. Radio [58] Fleld 0f Searchm 128/30 3 4 j frequency energy is set up in a driver coil and a driven 12880318 303'1 l1 coil mounted in a handpiece. The driver coil energizes the driven coil to energize a surgical electrode con- [56] References C'ted nected to one end of the driven coil Connection be- UNITED STATES PATENTS tween the source of radio frequency energy and the l,805,904 5/1931 Carpenter l28/303.14 driver coil includes a circuit in which condensers and 2,238,834 /19 1 Travers v v 3 /1 E impedances are so connected that, if there is a failure 39391496 5/1963 DFgellfmnm 128/303-14 of the condensers, energy is dissipated. Sonic warning i signals indicate production of cutting, coagulating, v a 30 e a 3,804,096 4/1974 Gonser l28/303.l4 and blended Currents 3,807,404 4/1974 Weissman et al 128603.14 6 Claims, 10 Drawing Figures sum 1 B 3 /IQ la D PATENTED MAR] 1 5 SHEET 2 OF 3 3' v Vila!) 1 ELECTROSURGICAL DEVICE This invention relates to an electrosurgical device. More particularly, this invention relates to a multipurpose electrosurgical device. The device of this invention represents an improvement in the type of device shown in my copending application Ser. No. 310,830, filed Nov. 30, l972, now US. Pat. No. 3,804,096.

An object of this invention is to provide a radio frequency electrosurgical device in which a surgical electrode can be energized by a handpiece coil connected thereto, which handpiece coil, in turn, is energized by a driver coil coupled thereto, the radio frequency energy being supplied through a transmission line from a radio frequency power source.

A further object of this invention is to provide such a device which develops both a cutting current and a coagulating current and which provides a sonic warning signal of one frequency when the cutting current is being produced and a sonic warning signal of a different frequency when the coagulating current is being produced.

A further object of this invention is to provide such a device which also develops a blended current and which provides a sonic warning signal which is a blend of the frequencies when the blended current is being developed.

A further object of this invention is to provide such a device in which radio-frequency electrosurgical current is fed to an electrosurgical instrument through condensers in series between a power source and the instrument, and means is provided between condensers for bleeding on non-radio-frequency current to ground in the event of condenser failure.

Briefly, this invention provides an electrosurgical device including a handpiece in which a first coil and a second coil are wound on a handpiece core. A source of radio-frenquency current of an electrosurgical frequency is coupled to one end of the second coil and an electrode is connected to one end of the first coil. The source of radio-frequency current is coupled to the second coil through series connected condensers, and inductance means is provided between condensers to bleed off non-radio-frequency current to ground in the event of condenser failure. The power source has means for generating cutting current, coagulating current, and blended'current. Sonic warning devices ofdifferent frequencies sound when the cutting and coagulating currents are being generated. A blended sound is produced when a blended current is generated,

The above and other objects and features of the invention will be apparent to those skilled in the art to which this invention pertains from the following detailed description and the drawings in which:

FIG. I is a view in side elevation of an electrosurgical device constructed in accordance with an embodiment of this invention, the device being shown in association with a fragmentary portion of a patient on a fragmentary portion ofa table, the table being shown in section;

FIG. 2 is an enlarged fragmentary view in lengthwise section of the electrosurgical device shown in FIG. 1, Wiring being omitted for clarity;

FIG. 3 is a plan view of a handpiece portion of the electrosurgical device, a case thereof being broken away to reveal interior construction;

FIG. 4 is a view in side elevation of an inner assembly of the handpiece portion;

FIG. 5 is a view in lengthwise section of the handpiece portion shown in FIG. 3, wiring thereof being broken away to reveal structural details;

FIG. 6 is a view in end elevation of a cap of the device;

FIG. 7 is another end elevational view of the cap shown in FIG. 6;

FIG. 8 is a view in section taken on the line 8-8 in FIG. 6;

FIG. 9 is an exploded view of a power cable of the electrosurgical device and end fastener elements thereof; and 9 FIG. 10 is a schematic circuit diagram of the device.

In the following detailed description and the drawings, like reference characters indicate like parts.

In FIG. 1 is shown an electrosurgical device 14 con structed in accordance with an embodiment of this invention. The device 14 includes a handpiece portion 16 and a cable connecting portion 17. The cable connecting portion 17 is mounted on an end of a coaxial cable 18. The handpiece portion 16 is arranged to support a surgical electrode 19. In FIG. 1 the surgical electrode is shown in position to perform a surgical operation on a patient 21. The patient is shown in position on a passive electrode 22 and supported by a table 23 which underlies the passive electrode 22. The passive electrode 22 is provided with a lead 422.

The handpiece portion 16 (FIG. 5) includes a central tubular electromagnetic core 24. A first or driven coil 26 is wound on the core 24. A layer of insulation 27 overlies the first coil, and a second or driver coil 28 is wound on the layer of insulation. A stud 29, which is mounted in a central bore 31 of the core 24, supports a hollow chuck fitting 32. A second stud 33 mounted in the central bore 31 supports a hollow receptacle sleeve fitting 34. A hollow sleeve 36 of dielectric material surrounds the receptacle sleeve fitting 34, the coils 26 and 28, and the chuck fitting 32 with chuck jaws 37 of the fitting 32 extending outwardly thereof. The surgical electrode 19 can be received inside the chuck jaws 37. A cap 39 (FIGS. 3 and 6-8) is threaded on the chuck jaws 37 and can tighten the chuck jaws on the electrode 19. The cap 39 has a central opening 40 through which the electrode 19 projects. One end portion 41 (FIG. 3) of the first coil 26 is attached to the chuck fitting 32 as by soldering so that the end portion 41 of the first coil 26 is electrically connected to the electrode 19.

A cable connector receptacle 42 is mounted in the receptacle sleeve fitting 34. As shown in FIG. 2, the cable connector receptacle 42 includes a central tube 43, which is supported by an insulator sleeve 44. The other end portion 46 of the first coil 26 is attached to the tube 43 as shown in FIG. 3. One end portion 47 of the second coil 28 is soldered to the end portion 46 of the coil 26. The other end portion 48 of the second coil 28 is attached to one side of a capacitor 49. The other side of the capacitor 49 is attached to the receptacle sleeve fitting 34'by solder as indicated at 51.

The cable connector receptacle 42 is provided with a central socket 52 (FIG. 5) which can receive a coaxial cable end assembly 53. The coaxial cable end assembly 53 includes a body 54 (FIGS. 2 and 9), an annular latch member 56, and an annular latch actuator member 57. The body 54 supports annular insulator members 58 and 59 (FIG. 2) inside which is mounted a contact member 61 having a head 62 which can be received inside the central tube 43 in electrical connection therewith. A central lead 63 (FIG. 9) of the coaxial cable 18 can be received inside a socket 64 (FIG. 2) in the contact member 61 with an insulating layer 66 (FIG. 9).of the coaxial cable 18 being received inside a central bore 67 of the body 54. An end portion of an annular conductor 68 of the coaxial cable 18 overlies a stem 69 of the body 54 to form an electrical connection therewith. A sleeve 71, whichsurrounds the cable 18, can be advanced to the position shown in dotdash lines at 71A to hold the annular conductor 68 in position on the stem 69. An outer insulation sleeve 73 forms an outer layer of. the coaxial cable 18 surrounding the annular conductor 68.

The latch member 56 is threaded on the body 54 and includes latch hooks 76 mounted on spring arms 77 which resiliently urge the latch hooks 76 outwardly. The latch actuator 57 is slideably mounted on the latch member 56. The latch actuator 57' includes slots 78 through which the hooks 76 extend. A sleeve 79 (FIG. 2) of insulating material is mounted on the latch actuator member 57. When the assembly 53 is mounted in v the central socket 52, the teeth 76 extend into an annular slot 81 (FIG. 2) in the wall of the socket 52 to lock the assembly 53 in the socket 52. When the insulation sleeve 79 and the latch actuator 57 are moved to the left as shown in FIG. 2, the teeth 76 are urged inwardly to cause release of the teeth 76 from the slot 81 to permit removal of the cable end assembly 53.

' In FIG. is shown schematically the wiring diagram of the device. Alternating current power is supplied by power leads 111 and 112. A power line radio frequency interference filter 113 including condensers 114 and 115 and inductances 116 and 117 greatly attenuates radio frequency feed-back to the power leads. A power line fuse 118 is provided in the lead 111. An interlock switch 119 can be provided in the power lead 111. The interlock switch 119 is closed during operation of the device but can be arranged to open when a casing of the device (not shown) is opened.

Leads 121 and 122 from the power line filter 113 are connected to poles 123 and 124, respectively, of a triple pole double throw on-off switch 126. When the onoff switch 126 is in the position shown (off position), the leads 121 ans 122 are connected to power a primary winding 127 of a transformer 128 to impress a low voltage such as 4 volts on a secondary winding 129 thereof. When the on-off switch 126 is in its other position (on position), the leads 121 and 122,are connected to a primary winding 1291 of a transformer 130 to power the transformer. A panel light 131 is connected in parallel with the primary winding 1291 to indicate that the primary winding 1291 is powered. A thermally activated circuit breaker 1292 in series with the primary winding 1291 protects the transformer 130. A third pole 132 of the switch 126, when in the on position, connects leads 133 and 134 to connect one side of a heater electrode 135 of a tetrode main power amplitier tube 136 to one side of a first secondary winding 137 of the transformer 130, which can be constructed to produce approximately 6 volts AC to the heater electrode 135. A capacitor 2135 is connected between the line 133 and ground to shunt any radio-frequency current from the heater electrode 135. The other side of the first secondary winding 137 is connected to ground as is the opposite side of the heater electrode 135. A fan motor 1371 is also connected in parallel with the primary winding 1291 to drive a fan 1372 which blows air on the tetrode 136 and other components to cool the tetrode and other components. When the on-off switch 126 is swung to its off position, the pole 132 connects the lead 133 to the secondary winding 129 of the transformer 128 so that the heater electrode 135 is heated not only when the on-off switch 126 is in the on position but also when the on-off switch 126 is in the off position. As already pointed out, the secon dary winding 129 of the transformer 128 can be arranged to deliver about four voltsso that the heater electrode 135 is heated but at a lower temperature when the switch 126 is in the off position but is maintained at a sufficient temperature that the device will operate at once when the switch 126 is turned on.

A secondary winding 146 of the transformer 130 supplies a voltage of approximately 2000 volts AC across leads 147 and 148 to a full wave bridge rectifier 149 which supplies 2000 volts direct current across leads 150 and 151. The lead 150 is connected to ground as is a cathode 152 of the tetrode 136. The lead 151 is connected through a plate choke 153 and a para sitic suppressor network 154 to a plate 156 of the tetrode 136 so that 2000 volts DC is impressed between the cathode 152 and the plate 156 of the tetrode 136. A filter condenser 157 smooths out wave form ripple from the rectifier 149. A tapped resistor 159 and a fixed resistor 159A are connected in series across the leads 150 and 151. A lead 158 connected to the tap of the tapped resistor 159 supplies a positive potential through a resistor 161 and a lead 162 to a screen grid of the tetrode 136. A voltage of approximately 380 volts can be taken off at the tap which is maintained on the screen grid. An appropriate resistance 164 bleeds offscreen grid current to ground. A capacitor 166 connected between the screen grid lead 162 and ground removes or shunts out radio frequency from the screen grid. 1

A section 146A of the second secondary winding 146 of the transformer 130 is connected in parallel with a capacitor 1468 to form a tuned circuit tuned to a line input frequency, which can be Hertz, to stabilize the secondary winding voltages to a variation of approximately i1 percent with a change in input voltage of ilO percent impressed on the primary winding 129. Thus, the transformer 130 is a substantially constant voltage transformer stabilizing all the circuitry of the device.

A bias voltage for a control grid 168 of the tetrode 136 is supplied by a third secondary winding 169 of the transformer 130. A first lead 171 from the winding 169 is connected to ground and a second lead 172 from the winding 169 is connected to a rectifier 173. The rectifier 173 supplies a negative potential through a resistance 1741 and an inductance 1742 to a lead 174, which is connected to one end of a first series winding 176 of a transformer 1761. The other end of the winding 176 is connected through a second series winding 1762 of the transformer 1761 to a lead 179 connected to the control grid 168 of the tetrode 136. A condenser 181 which is connected between ground and a junction 1743 smooths out the wave form of the potential from the rectifier 173. A resistance 183 connected in parallel with the condenser 181 serves to discharge the condenser 181 when the device is turned off. The bias voltage can be approximately l volts.

Oscillator circuits 184 and 186 for the device are powered from a fourth secondary winding 187 of the transformer 130. Leads 188, 189 and 190 from the winding 187 are connected through a single pole double throw switch 191 to a full wave bridge rectifier 192 which supplies a DC voltage across leads 193 and 194. When the switch 191 is in the position shown, a voltage of approximately 16 volts is supplied across the leads 193 and 194. When the switch 191 is in nits other position, a voltage of approximately volts is supplied across the leads 193 and 194. A condenser 195 connected across leads 193 and 194 smooths ripple voltage. A resistance 1961 connected across the leads 193 and 194 discharges the condenser 195 when the device is turned off. The lead 193 is connected to ground. The lead 194 is connected to the pole of a single pole double through switch 196. When the switch 196 is in the position shown, the lead 194 is connected through a short lead 197 to the pole of a single pole double throw switch 198. The switches 196 and 198 can be foot operated switches. The switches 196 and 198 are shown in their normal positions. When the switch 196 is turned to its other position, the lead 194 is connected to a lead 199. When the switch 198 is turned to its other position, while the switch 196 remains in the position shown, the lead 194 is connected to lead 200. If the switches 196 and 198 are both turned to their other position, the lead 194 is connected to the lead 199, and it is impossible to connect both the leads 199 and 200 to the lead 194 at the same time. The lead 199 is connected to one side of a potentiometer 201. The other side of the potentiometer 201 is connected to ground through an adjustable resistor 202. In a similar manner, the lead 200 is connected to one side of a potentiometer 203. The other side of the potentiometer 203 is connected to ground through an adjustable resistor 204. Thus, when the switch 196 is advanced to its other position, a selected DC voltage is impressed across the potentiometer 201 and when the switch 198 is advanced to its other position while the switch 196 remains in the position shown, a selected DC voltage is impressed across the potentiometer 203.

A voltage between Zero and the selected voltage is impressed upon a lead 206 connected to the tap of the potentiometer 203 when the switch 198 is in its other position and the switch 196 is in the position shown. The lead 206 is connected through an inductance or choke 207 to the collector of a transistor 208, which is a part of the oscillator circuit 186. The emitter of the transistor 208 is connected to ground. The lead 206 is also connected through resistors 209 and 211 and a rectifier 212 to one side of a tickler coil 213. The rectifier 212 functions to reverse bias the base ofthe transistor 208 and is connected to one side of the tickler coil 213, which is excited by a tank circuit consisting of an inductance 214 and a condenser 216 coupled to the transistor 208 in which continuous oscillation is set up by the tank circuit. The other side of the tickler coil 213 is connected to the base of the transistor 208. The rectifier 212 establishes the reverse bias required by the base of the transistor 208 and is also connected to ground through a condenser 217 which establishes the bias network circuitry. A bias rectifier 2171 is connected between ground and ajunction between the resistors 209 and 211. The tank circuit is connected with the collector of the transistor 208 through a coupling condenser 218. A condenser 219 is connected between the emitter and the collector of the transistor 208 to shunt out radio frequency potentials. A capacitor 777 acts to provide a bypass to ground shunt for attenuating radio frequency feed-back into the line 206 when the oscillating circuit 186 is in operation. The tank circuit can be tuned to oscillate at a rate ofapproximately 1.8 megaHertz. The oscillation is picked up by the transformer winding 1762 and the voltage thereof is multiplied by the transformer winding and impressed by way of the lead 179 on the control grid 168 of the tetrode 136 to provide an amplified output by the tetrode 136 of that frequency. The output of the tetrode 136 is impressed by way ofa lead 220 on an output circuit which is coupled through condenser 221 to a tuned pie network which includes condensers 222 and 225 and inductances 223 and 226. Right-hand ends of the inductances 223 and 226 are connected to ground so that, if there should be failure of the condensers 221 and 222, the direct current output of the tetrode 136 would be drained off to ground without danger to the patient. A take-off lead 224 which is connected between the condenser 222 and the inductance 223 extends to one side of a condenser 225. The other side of the condenser 225 is connected to the central lead 63 of the coaxial cable 18 and through the cable end assembly 53 to one end of the second coil 28. The annular conductor 68 of the coaxial cable 18 is connected to ground. The passive electrode 22 is connected to one side of a condenser 227. The other side of the condenser 227 is connected to ground. Thus, a continuous radio frequency oscillating potential is set up in the first coil 26 and in the electrode 19.

When the switch 198 is moved to its other position and the switch 196 remains in the position shown and a single pole double throw blend switch 2341 is in the off position shown, a continuous oscillation is impressed on the coil 28. When the switch 196 is moved to its other position and while the single pole double throw blend switch 2341 is in the off position shown, the oscillating circuit 184 is energized to produce an interrupted oscillation in the driver coil 28. The oscillating circuit 184 is generally similar to the circuit 186 already described and includes a transistor 237, a tank circuit inductance 238, a tank circuit capacitor 239, and a tickler coil 240 and associated elements. A lead 241, which is connected to the tap of the potentiometer 201, is connected through a choke 242 to the collector of the transistor 237. Moving of the switch 196 to its other position impresses a selected DC voltage across the potentiometer 201 and a DC voltage between zero and the selected voltage is impressed upon the lead 241. The emitter of the transistor 237 is connected to ground. The oscillating circuit 184 is set in operation to deliver an oscillator frequency of approximately 1.8 megaHertz on the control grid of the tetrode 136. The lead 199, which is connected to the high side of the potentiometer 201, is also connected through the pole of the blend switch 2341 to a lead 245, which is connected to base leads of transistors 244 and 246, which form a multivibrator circuit. through resistors 247 and 248, respectively. The collector lead of the transistor 244 is coupled through a condenser 249 to the base of the transistor 246 and the collector of the transistor 246 is coupled through a condenser 251 to the base of the transistor 244. The collectors of the transistors 244 and 246 are connected to the lead 245 through resistors 2511 and 2512, respectively. Emitters of the transistors 244 and 246 are connected to ground. The multivibrator circuit can be arranged to oscillate at a rate of approximately 7,000 Hertz. A lead 252 from the collector of the transistor 244 is connected through a coupling condenser 253 and a rectifier 2531, and a resistor 2532 connected in parallel with the rectifier 2531, to the base of the transistor 237 so that the operation of the oscillating circuit 184 is interrupted at a rate of 7,000 Hertz to put an interrupted oscillating potential on the control grid of the tetrode 136 and to supply an interrupted radio-frequency oscillating potential at the electrode 19. The rectifier 2531 and the resistor 2532 connected in parallel with the rectifier 2531 forms a network which preserves the wave form generated by the multivibrator circuit as it is transmitted to the oscillator circuit 184.

An adjustable capacitor 1765 is connected between the lead 179 and ground and can be adjusted so that it tunes with the transformer secondary coils 176 and 1762 and with the capacitor 2172 so that the grid input is tuned with the plate series tuned circuit 222,223, 225, and 226. Both of these circuits are tuned with the driver input oscillating circuits 184 and 186 at approxi mately 1.8 megaHertz.

When the blend switch 2341 is disposed in its other or on position, moving of the switch 198 to its other position while the switch 196 is in the position shown energizes both of the oscillating circuits 184 and 186.

The oscillating circuit 186 is energized in the same manner as already described. The lead 200, which is connected to the switch 198, is connected through a lead 256, a rectifier 257, the blend switch 2341, the lead 245, and an adjustable resistor 2572 to the lead 199, which is connected to the right hand end of the potentiometer 201. The rectifier 257 prevents unwanted cross feed between the leads 199 and 200. Both the oscillating circuit 184 and the oscillating circuit 186 are set in operation and an output is provided from v the tetrode 136 for energizing the electrode 19 which combines the interrupted oscillation of the circuit 184 with the uninterrupted oscillation of the circuit 186.

The lead 199, which is connected to the high side of the potentiometer 201, is also connected to a sonic signalling device 271, which is constructed to produce a sound signal of a selected frequency, which can be 2,900 Hz. The sonic signalling device 271 is connected to ground through a pole 2721 of an on-off switch 272 and a resistor 273. Similarly, the lead 200, which is connected to the high side of the potentiometer 203, is also connected to a second sonic signalling device 274, which is constructed to produce a sound signal ofa second selected frequency, which can be 4,500 Hz. The sonic signalling device 274 is connected to ground through a pole 2722 of the on-off switch 272 and a resistor 276. The sonic signalling device 271 sounds when the potentiometer 201 is energized to energize the oscillating circuit 184 to produce a sound signal which indicates to the user of the device that the oscillating circuit 184 is operating. The sonic signalling device 274 similarly produces a sound signal when the oscillating circuit 186 is energized to indicate that the oscillating circuit 186 is operating. When both the oscillating circuits 184 and 186 are operating, i.e., when a blended current is being produced, a sound signal is produced which is a blend ofthe selected frequencies. if the user does not want sound signals, the on-off switch'272 can be opened. The size of the resistors 273 and 276 determines the loudness of the sound signals.

When the device-is to be used, an appropriate electrode 19 is mounted in the chuck jaws 37 (FIG. 5). The blend switch 2341 (FIG. 10) is disposed either in its other position at which a blend of interrupted and uniterrupted oscillations is produced, or in the of position shown at which only one of the oscillating circuits 184 and 186 can be used at one time. The output range switch 191 is placed in either the position shown or in its other position. The cable end assembly 53 (FIG. 2) is mounted inside the cable connector receptacle 42. The main on-off switch 126 is turned on, and the electrode 19 is moved to a position adjacent or touching tissues of the patient 21 (FIG. 1) at a point where electrosurgery is to be performed. The appropriate one of the foot operated switches 196 and 198 (FIG. 9) is moved to its other position to provide a radio frequency current flow in the coil 28 which induces a like radio frequency oscillation in the coil 26. As the electrode 19 touches or approaches the body of the patient, an electro-surgical action is provided at theelectrode, and a return electrical path is provided through the ancillary or passive electrode 22.

When the electrosurgical operation is to be an ordinary or usual cutting action, the blend switch 2341 is disposed in the position shown (off position), and the foot operated switch 198 is moved to its other position to set the oscillating circuit 186 in operation and to provide an uninterrupted oscillation. if a coagulating, dessicating, or fulgurating action is desired, the foot operated switch 196 is moved to its other position to cause operation of the oscillating circuit 184 and the multivibrator circuit of the transistors 244 and 246 providing an interrupted oscillation. If a blend of interrupted and uninterrupted oscillations is required, as where very substantial tissue destruction is desired as in some cutting operations, the blend switch 2341 is moved to its other or on position, and the switch 198 is moved to its other position to .cause delivery of a blending of interrupted and uninterrupted oscillations.

The power delivered by the oscillating circuit 184 can be adjusted by movement of the tap of the potentiometer 201. The power delivered by the oscillating circuit 186 can be adjusted by movement of the tap of the potentiometer 203.

The condenser 227 (FIG. 10), through which the passive electrode 22 is coupled to ground, permits passage of radiofrequency current to permit electrosurgical action but limits passage oflower frequency current which might shock the patient. The condenser 49,

through which the driver coil 28 is coupled to ground,

similarly permits passage of radiofrequency current but prevents passage of lower frequency current generated as a sub-harmonic of the radiofrequency current to isolate the coils 28 and 26 from such lower frequency current. The condenser 49 is disposed in the handpiece to isolate the driver coil 28 from the outer conductor 68 of the coaxial cable 18 shield, which is at ground potential.

With the structure of this invention, a number of probe or handpiece elements canbe employed with a single power unit and cable 18, and change of handpiece elements can be rapidly and conveniently effected.

The electrosurgical device described above and illustrated in the drawings is subject to structural modification without departing from the spirit and scope of the appended claims.

Having described my invention, what I claim as new and desire to secure by letters patent is:

1. In an electrosurgical device, the combination of a coaxial cable including a central lead and an outer conductor and means for generating a radio-frequency current of an electrosurgical frequency in the central lead of the coaxial cable, with a handpiece which comprises an elongated core, a first coil and a second coil wound on said core, means for supporting an electrosurgical electrode mounted at one end of the core, socket means mounted on the opposite end of the core, the socket means receiving an end connector portion of the coaxial cable, the socket means having a power contact, the power contact being connected to the cen tral lead of the coaxial cable, means for connecting one end of the first coil to the electrode holder, means for connecting one end of the second coil to the power contact, whereby an electrosurgical current is induced in the electrode, a condenser, and means for coupling the other end of the second coil to the outer conductor through the condenser.

2. A device as in claim 1 wherein the other end of the first coil is connected to the power contact.

3. A device as in claim 1 wherein a dielectric sleeve surrounds the coils and the socket means.

4. In an electrosurgical device, the combination of a coaxial cable including a central lead and an outer conductor and means for generating a radio-frequency current of an electrosurgical frequency in the central lead of the coaxial cable, with a handpiece which comprises an elongated core, a first coil and a second coil wound on said core, means for supporting an electrosurgical electrode mounted at one end of the core, socket means mounted on the opposite end of the'core, the socket means receiving an end connector portion of the coaxial cable, the socket means having a power contact, the power contact being connected to the central lead of the coaxial cable, means for connecting one end of the first coil to the electrode holder, means for connecting one end of the second coil to the power contact, whereby an electrosurgical current is induced in the electrode, and a condenser mounted in the hand piece, the other end of the second coil being coupled to ground through the condenser and the outer conductor of the coaxial cable, the other end of the first coil being connected to the power contact.

5. In an electrosurgical device, the combination of a coaxial cable including a central lead and an outer conductor and means for generating a radio-frequency current of an electrosurgical frequency in the central lead of the coaxial cable, with a handpiece which comprises an elongated core, a first coil and a second coil wound on said core, means for supporting an electrosurgical electrode mounted at one end of the core, socket means mounted on the opposite end of the core, the socket means receiving an end connector portion of the coaxial cable, the socket means having a power contact, means connecting the power contact to the central lead of the coaxial cable, means for connecting one end of the first coil to the electrode holder, means for connecting one end of the second coil to the power contact, whereby an electrosurgical current is induced in the electrode, and a condenser, the socket means including a ground contact connected to the outer conductor of the coaxial cable, and the other end of the second coil being coupled to the ground contact through the condenser.

6. In an electrosurgical device, the combination of a coaxial cable having a central lead and an outer conductor and means for generating a radio-frequency current of an electrosurgical frequency in the central lead of the coaxial cable, with a handpiece which comprises a first coil, a second coil inductively coupled to the first coil, an electrode, means for connecting one end of the first coil to the electrode, means for connecting one end of the second coil to the central lead, and a condenser, the other end of the second coil being coupled to the outer conductor through the condenser, the second coil powering the first coil and the electrode, the outer conductor preventing radio-frequency leakage between the generating means and the handpiece.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1805904 *10 Jul 192919 May 1931Collins Dev CorpElectrotherapeutical device
US2238834 *16 May 194015 Apr 1941Richard Di PippoElectric connector plug
US3089496 *19 Aug 195914 May 1963Code IncControl system for surgical apparatus
US3678446 *2 Jun 197018 Jul 1972Atomic Energy CommissionCoaxial cable connector
US3707149 *16 Oct 197026 Dec 1972Majesco IncElectrosurgery unit and instrument
US3804096 *30 Nov 197216 Apr 1974Dentsply Int IncElectrosurgical device
US3807404 *12 Mar 197330 Apr 1974Whaledent IncProbe unit for electro-surgical device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4183359 *20 Jan 197815 Jan 1980Electro-Kinetic Eng./Mfg., Inc.Epilator
US4196734 *16 Feb 19788 Apr 1980Valleylab, Inc.Combined electrosurgery/cautery system and method
US4431254 *19 Oct 198114 Feb 1984Societe Generale Pour L'industrie Electronique (S.O.G.I.E.)Connector element for an armoured cable with two multico-core conductors
US4492832 *23 Dec 19828 Jan 1985Neomed, IncorporatedHand-controllable switching device for electrosurgical instruments
US4657016 *16 Apr 198514 Apr 1987Garito Jon CElectrosurgical handpiece for blades, needles and forceps
US4800878 *26 Aug 198731 Jan 1989Becton, Dickinson And CompanyElectrosurgical knife with visual alarm
US5626577 *29 Dec 19956 May 1997Harris; George A.Manually extendable electrocautery surgical apparatus
US5630812 *11 Dec 199520 May 1997Ellman; Alan G.Electrosurgical handpiece with locking nose piece
US5647869 *28 Jun 199515 Jul 1997Gyrus Medical LimitedElectrosurgical apparatus
US6027501 *20 Jun 199822 Feb 2000Gyrus Medical LimitedElectrosurgical instrument
US6056746 *27 Mar 19982 May 2000Gyrus Medical LimitedElectrosurgical instrument
US6090106 *26 Mar 199818 Jul 2000Gyrus Medical LimitedElectrosurgical instrument
US6093186 *18 Dec 199725 Jul 2000Gyrus Medical LimitedElectrosurgical generator and system
US6117132 *22 Feb 199912 Sep 2000Ethicon Endo-Surgery, Inc.Inductively coupled electrosurgical trocar
US617430826 May 199916 Jan 2001Gyrus Medical LimitedElectrosurgical instrument
US621040517 Jun 19973 Apr 2001Gyrus Medical LimitedUnder water treatment
US623417827 May 199922 May 2001Gyrus Medical LimitedElectrosurgical instrument
US626128616 Oct 199817 Jul 2001Gyrus Medical LimitedElectrosurgical generator and system
US627711418 Mar 199921 Aug 2001Gyrus Medical LimitedElectrode assembly for an electrosurical instrument
US62939422 May 199625 Sep 2001Gyrus Medical LimitedElectrosurgical generator method
US630613416 Oct 199823 Oct 2001Gyrus Medical LimitedElectrosurgical generator and system
US63582739 Apr 199919 Mar 2002Oratec Inventions, Inc.Soft tissue heating apparatus with independent, cooperative heating sources
US636487716 Oct 19982 Apr 2002Gyrus Medical LimitedElectrosurgical generator and system
US63793505 Oct 199930 Apr 2002Oratec Interventions, Inc.Surgical instrument for ablation and aspiration
US639102816 May 200021 May 2002Oratec Interventions, Inc.Probe with distally orientated concave curve for arthroscopic surgery
US641650926 Mar 19989 Jul 2002Gyrus Medical LimitedElectrosurgical generator and system
US646135725 Jun 19998 Oct 2002Oratec Interventions, Inc.Electrode for electrosurgical ablation of tissue
US648220210 Jan 200119 Nov 2002Gyrus Medical LimitedUnder water treatment
US654426031 Dec 19998 Apr 2003Oratec Interventions, Inc.Method for treating tissue in arthroscopic environment using precooling and apparatus for same
US65655613 Apr 200020 May 2003Cyrus Medical LimitedElectrosurgical instrument
US66452032 Jan 200111 Nov 2003Oratec Interventions, Inc.Surgical instrument with off-axis electrode
US66958398 Feb 200124 Feb 2004Oratec Interventions, Inc.Method and apparatus for treatment of disrupted articular cartilage
US67801808 Mar 200024 Aug 2004Gyrus Medical LimitedElectrosurgical instrument
US693934628 Jun 20026 Sep 2005Oratec Interventions, Inc.Method and apparatus for controlling a temperature-controlled probe
US699794117 Mar 200314 Feb 2006Oratec Interventions, Inc.Method and apparatus for treating annular fissures in intervertebral discs
US70449484 Dec 200316 May 2006Sherwood Services AgCircuit for controlling arc energy from an electrosurgical generator
US713186020 Nov 20037 Nov 2006Sherwood Services AgConnector systems for electrosurgical generator
US71379801 May 200321 Nov 2006Sherwood Services AgMethod and system for controlling output of RF medical generator
US722644723 Jun 20045 Jun 2007Smith & Nephew, Inc.Electrosurgical generator
US72556944 Dec 200314 Aug 2007Sherwood Services AgVariable output crest factor electrosurgical generator
US726768314 Nov 200311 Sep 2007Oratec Interventions, Inc.Method for treating intervertebral discs
US728206114 Nov 200316 Oct 2007Oratec Interventions, Inc.Method of treating intervertebral disc
US730043521 Nov 200327 Nov 2007Sherwood Services AgAutomatic control system for an electrosurgical generator
US730355727 Dec 20044 Dec 2007Sherwood Services AgVessel sealing system
US736457724 Jul 200329 Apr 2008Sherwood Services AgVessel sealing system
US739633627 Oct 20048 Jul 2008Sherwood Services AgSwitched resonant ultrasonic power amplifier system
US740093014 Nov 200315 Jul 2008Oratec Interventions, Inc.Method for treating intervertebral discs
US741643723 Aug 200626 Aug 2008Sherwood Services AgConnector systems for electrosurgical generator
US751389624 Jan 20067 Apr 2009Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US762878616 May 20058 Dec 2009Covidien AgUniversal foot switch contact port
US763790719 Sep 200629 Dec 2009Covidien AgSystem and method for return electrode monitoring
US764712331 Oct 200712 Jan 2010Oratec Interventions, Inc.Method for treating intervertebral discs
US764849921 Mar 200619 Jan 2010Covidien AgSystem and method for generating radio frequency energy
US765149224 Apr 200626 Jan 2010Covidien AgArc based adaptive control system for an electrosurgical unit
US76514933 Mar 200626 Jan 2010Covidien AgSystem and method for controlling electrosurgical snares
US765500322 Jun 20052 Feb 2010Smith & Nephew, Inc.Electrosurgical power control
US7696850 *13 May 200813 Apr 2010Triasx Pty Ltd.Apparatus for applying a load
US772260130 Apr 200425 May 2010Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US77317178 Aug 20068 Jun 2010Covidien AgSystem and method for controlling RF output during tissue sealing
US77492176 May 20036 Jul 2010Covidien AgMethod and system for optically detecting blood and controlling a generator during electrosurgery
US776669316 Jun 20083 Aug 2010Covidien AgConnector systems for electrosurgical generator
US77669054 Feb 20053 Aug 2010Covidien AgMethod and system for continuity testing of medical electrodes
US778066223 Feb 200524 Aug 2010Covidien AgVessel sealing system using capacitive RF dielectric heating
US779445728 Sep 200614 Sep 2010Covidien AgTransformer for RF voltage sensing
US78244003 Mar 20062 Nov 2010Covidien AgCircuit for controlling arc energy from an electrosurgical generator
US783448416 Jul 200716 Nov 2010Tyco Healthcare Group LpConnection cable and method for activating a voltage-controlled generator
US790140027 Jan 20058 Mar 2011Covidien AgMethod and system for controlling output of RF medical generator
US792732824 Jan 200719 Apr 2011Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US794703912 Dec 200524 May 2011Covidien AgLaparoscopic apparatus for performing electrosurgical procedures
US7957815 *29 Sep 20067 Jun 2011Thermage, Inc.Electrode assembly and handpiece with adjustable system impedance, and methods of operating an energy-based medical system to treat tissue
US797232824 Jan 20075 Jul 2011Covidien AgSystem and method for tissue sealing
US797233216 Dec 20095 Jul 2011Covidien AgSystem and method for controlling electrosurgical snares
US801215030 Apr 20046 Sep 2011Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US802566018 Nov 200927 Sep 2011Covidien AgUniversal foot switch contact port
US80340498 Aug 200611 Oct 2011Covidien AgSystem and method for measuring initial tissue impedance
US805267521 Jan 20108 Nov 2011Smith & Nephew, Inc.Electrosurgical power control
US808000818 Sep 200720 Dec 2011Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US809696127 Jun 200817 Jan 2012Covidien AgSwitched resonant ultrasonic power amplifier system
US810495623 Oct 200331 Jan 2012Covidien AgThermocouple measurement circuit
US810532324 Oct 200631 Jan 2012Covidien AgMethod and system for controlling output of RF medical generator
US811305727 Jun 200814 Feb 2012Covidien AgSwitched resonant ultrasonic power amplifier system
US811880810 Mar 200921 Feb 2012Vivant Medical, Inc.Cooled dielectrically buffered microwave dipole antenna
US814748523 Feb 20093 Apr 2012Covidien AgSystem and method for tissue sealing
US81872623 Jun 200929 May 2012Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US818731215 Oct 200729 May 2012Neurotherm, Inc.Method for treating intervertebral disc
US820227125 Feb 200919 Jun 2012Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US82162207 Sep 200710 Jul 2012Tyco Healthcare Group LpSystem and method for transmission of combined data stream
US821622323 Feb 200910 Jul 2012Covidien AgSystem and method for tissue sealing
US822663910 Jun 200824 Jul 2012Tyco Healthcare Group LpSystem and method for output control of electrosurgical generator
US822669715 Oct 200724 Jul 2012Neurotherm, Inc.Method for treating intervertebral disc
US823161623 Aug 201031 Jul 2012Covidien AgTransformer for RF voltage sensing
US824127829 Apr 201114 Aug 2012Covidien AgLaparoscopic apparatus for performing electrosurgical procedures
US826792829 Mar 201118 Sep 2012Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US826792916 Dec 201118 Sep 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US828752828 Mar 200816 Oct 2012Covidien AgVessel sealing system
US82982235 Apr 201030 Oct 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US83035805 Apr 20106 Nov 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US834893423 Sep 20118 Jan 2013Smith & Nephew, Inc.Electrosurgical power control
US835390518 Jun 201215 Jan 2013Covidien LpSystem and method for transmission of combined data stream
US847544723 Aug 20122 Jul 2013Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US848599316 Jan 201216 Jul 2013Covidien AgSwitched resonant ultrasonic power amplifier system
US848606124 Aug 201216 Jul 2013Covidien LpImaginary impedance process monitoring and intelligent shut-off
US851233221 Sep 200720 Aug 2013Covidien LpReal-time arc control in electrosurgical generators
US852385523 Aug 20103 Sep 2013Covidien AgCircuit for controlling arc energy from an electrosurgical generator
US855689014 Dec 200915 Oct 2013Covidien AgArc based adaptive control system for an electrosurgical unit
US86030825 Dec 201210 Dec 2013Smith & Nephew, Inc.Electrosurgical power control
US86473404 Jan 201211 Feb 2014Covidien AgThermocouple measurement system
US866321424 Jan 20074 Mar 2014Covidien AgMethod and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US868501623 Feb 20091 Apr 2014Covidien AgSystem and method for tissue sealing
US873443821 Oct 200527 May 2014Covidien AgCircuit and method for reducing stored energy in an electrosurgical generator
US875333410 May 200617 Jun 2014Covidien AgSystem and method for reducing leakage current in an electrosurgical generator
US877794110 May 200715 Jul 2014Covidien LpAdjustable impedance electrosurgical electrodes
US880816123 Oct 200319 Aug 2014Covidien AgRedundant temperature monitoring in electrosurgical systems for safety mitigation
USRE403888 May 200317 Jun 2008Covidien AgElectrosurgical generator with adaptive power control
DE3612646A1 *15 Apr 198630 Apr 1987Ellman InternationalElectrosurgical handle piece for blades, needles and forceps
DE19504508A1 *11 Feb 199522 Aug 1996Buehler Instr Medizintechnik GElectrode handgrip with incorporated cold light illumination for electrosurgery
Classifications
U.S. Classification606/45, 606/37, 439/578, 606/49
International ClassificationA61B18/12, A61B18/14
Cooperative ClassificationA61B18/12, A61B18/14, A61B18/1206, A61B2018/00178, A61B2018/0066, A61B18/1402
European ClassificationA61B18/12G, A61B18/12, A61B18/14B