US20060047275A1 - Electrical generator and system - Google Patents
Electrical generator and system Download PDFInfo
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- US20060047275A1 US20060047275A1 US11/258,916 US25891605A US2006047275A1 US 20060047275 A1 US20060047275 A1 US 20060047275A1 US 25891605 A US25891605 A US 25891605A US 2006047275 A1 US2006047275 A1 US 2006047275A1
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- 230000015271 coagulation Effects 0.000 claims description 46
- 238000005345 coagulation Methods 0.000 claims description 46
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- 238000009834 vaporization Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 11
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- 230000000694 effects Effects 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
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- 238000011477 surgical intervention Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
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- A61B18/14—Probes or electrodes therefor
- A61B2018/1467—Probes or electrodes therefor using more than two electrodes on a single probe
Definitions
- This invention relates to an electrosurgical generator, and to an electrosurgical system comprising a generator and an electrosurgical instrument with two or more treatment electrodes.
- electrosurgical generator and to an electrosurgical system comprising a generator and an electrosurgical instrument with two or more treatment electrodes.
- Such systems are commonly used for the cutting and/or coagulation of tissue in surgical intervention, most commonly in “keyhole” or minimally invasive surgery, but also in laparoscopic or “open” surgery.
- an electrosurgical system including a generator system for generating radio frequency (RF) power, and an electrosurgical instrument including at least three electrodes, the generator system comprising one or more sources of RF output power, and a controller operable to control the generator system such that it is capable of delivering a first cutting RF waveform to the electrosurgical instrument or a second coagulating RF waveform to the electrosurgical instrument, and, in a combined mode, to deliver both first and second RF waveforms, the system also including means for feeding the waveform to the three or more electrodes such that, in the combined mode, the cutting RF waveforms is delivered between a first pair of the three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes.
- RF radio frequency
- the “combined mode” of the generator can be provided in different ways.
- the generator system comprises a single source of radio frequency power, and, in the combined mode, the controller is operable to cause the generator system to alternate constantly between delivering the first cutting RF waveform and the second coagulating RF waveform.
- This is the more traditional “blended” signal of U.S. Pat. Nos. 6,416,509 and U.S. Pat. No. 3,885,569.
- the generator system comprises at least first and second sources of radio frequency power, operating at different frequencies, the first source of radio frequency power being adapted to deliver the first cutting RF waveform, and the second source of radio frequency power being adapted to deliver the second coagulating RPF waveform, and, in the combined mode, the controller is operable to cause the generator system to deliver both the first and second RF waveforms simultaneously.
- the controller is operable to cause the generator system to deliver both the first and second RF waveforms simultaneously.
- the means for connecting the waveform conveniently comprises a switching circuit for varying the connections between the source and the three or more electrodes such that, in the combined mode, a first part of the combined signal that is the cutting RF waveform is delivered between a first pair of the three or more electrodes, and a second part of the combined signal that is the coagulating RF waveform is delivered between a second pair of the three or more electrodes.
- the switching circuit of the generator is such that, in the combined mode, the connections between the power supply and the electrodes are switched such that the first part of the blend signal is delivered between the first and second electrodes, and the second part of the blend signal is delivered between the second and third electrodes.
- there is a common electrode which is used in both the cutting and coagulation operations, but it is equally feasible to have completely different pairs of electrodes for each function.
- the switching circuit comprises first and second input connections, first second and third output connections, and an electronic switch connected between the first and second output connections, and being adapted to open and close in order to connect the first and second output connections periodically one to the other.
- the electronic switch conveniently opens and closes at a frequency of between 5 and 100 Hz.
- the second and third output connections are preferably connected one to the other via a capacitor, typically one having a value of between 1 and 10 nF.
- the switching circuit is conveniently housed in the electrosurgical instrument, although it can alternatively be housed in the electrosurgical generator.
- the controller within the generator is adapted to determine the timing of the changes between the first and second parts of the combined signal, and the switching circuit is synchronised to operate in response thereto, so as to deliver the first and second parts of the combined signal respectively to the first and second pairs of electrodes.
- the switching circuit is adapted to determine the timing of the changes between the first and second parts of the combined signal, and the controller is adapted to operate in response thereto.
- means for connecting the waveform conveniently comprises one or more output stages arranged such that the cutting RF waveform from the first RF source is delivered between a first pair of the three or more electrodes, and the coagulating waveform from the second RF source is delivered between a second pair of the three or more electrodes.
- first and second sources are “hard wired” to deliver their respective waveforms to different output connections, and hence to different pairs of electrodes.
- the invention further resides in an electrosurgical system including a generator system for generating RF power, and an electrosurgical instrument including at least three electrodes, the generator system comprising at least one RF output stage, means for supplying power to the at least one output stage, and a controller operable to limit the radio frequency output voltage developed by the at least one output stage to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a combined mode, to deliver waveforms limited to both first and second threshold values
- the electrosurgical system also including means for coupling the waveform to the three or more electrodes such that, in the combined mode, a waveform limited to the first threshold value for cutting or vaporisation is delivered between a first pair of the three or more electrodes, and a waveform limited to the second threshold value for coagulation is delivered between a second pair of the three or more electrodes.
- the invention further resides in an electrosurgical generator for supplying RF power to an electrosurgical instrument, the generator comprising at least one RF output stage, three more output connections for the delivery of RF power to the electrosurgical instrument, means for supplying power to the at least one output stage, a controller operable to limit the RF output voltage developed by the at least one output stage to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a combined mode, to deliver waveforms limited to both first and second threshold values, and means for feeding the waveforms to the three or more output connections such that, in the combined mode, the waveform that is limited to the first threshold value for cutting or vaporisation is delivered between a first pair of the three or more output connections, and the waveform that is limited to the second threshold value for coagulation is delivered between a second pair of the three or more output connections.
- the invention further resides in an electrosurgical system including a generator for generating RF power, and an electrosurgical instrument including at least two electrodes, the generator comprising a RF output stage having two or more output connections, each in electrical connection with a respective one of the at least two electrodes, a power supply coupled to the output stage for supplying power to the output stage, a controller operable to limit the RF output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation.
- the electrosurgical system of U.S. Pat. No. 6,416,509 is such that the frequency of the blended signal can be pre-set to match the type of electrode intended for use.
- the blend ratio i.e. the ratio of that part of the blended signal that is a cutting or vaporisation signal, as compared with that part which is a coagulation signal
- the adjustment means is carried by the electrosurgical instrument, but the adjustment means can also conceivably be mounted on the generator.
- FIG. 1 is a schematic diagram of an electrosurgical system in accordance with the present invention
- FIG. 2 is a block diagram of the generator of FIG. 1 ,
- FIG. 3 is a schematic perspective view of an electrosurgical instrument used as a part of the system of FIG. 1 ,
- FIG. 4 is a schematic diagram of a switching circuit used in the system of FIG. 1 .
- FIGS. 5A and 5B are circuit diagrams of two electronic switching devices for the switching circuit of FIG. 4 .
- FIG. 6 is a schematic diagram of an alternative embodiment of switching circuit which can be used in the system of FIG. 1 .
- FIG. 7 is a block diagram of a generator in accordance with FIG. 2 , incorporating a switching circuit in accordance with FIG. 4 ,
- FIGS. 8A to 8 C are diagrams illustrating techniques for adjusting a blend switching ratio, FIGS. 8A and 8C being circuit diagrams of alternative ratio adjusting devices and FIG. 8B being a waveform diagram illustrating the operation of the device of FIG. 8A ,
- FIG. 9 is a block diagram of an alternative embodiment of generator system in accordance with the present invention.
- FIG. 10 is a block diagram of a further alternative system in accordance with the invention.
- FIGS. 11A and 11B are yet further alternative systems for feeding cut and coagulation outputs automatically to different respective electrode pairs.
- a generator 10 has an output socket 10 S providing a radio frequency (RF) output for an instrument 12 via a connection cord 14 .
- Activation of the generator may be performed from the instrument 12 via a connection in cord 14 or by means of a footswitch unit 16 , as shown, connected to the rear of the generator by a footswitch connection cord 18 .
- footswitch unit 16 has two footswitches 16 A and 16 B for selecting a coagulation mode and a cutting mode of the generator respectively.
- the generator front panel has push buttons 20 and 22 for respectively setting coagulation and cutting power levels, which are indicated in a display 24 .
- Push buttons 26 are provided as an alternative means for selection between coagulation and cutting modes.
- the generator comprises a radio frequency (RF) power oscillator 60 having a pair of output lines 60 C for coupling to the instrument 12 .
- the instrument 12 is shown in FIG. 2 in the form of an electrical load 64 .
- Power is supplied to the oscillator 60 by a switched mode power supply 66 .
- the RF oscillator 60 operates at about 400 kHz, with any frequency from 300 kHz upwards into the HF range being feasible.
- the switched mode power supply typically operates at a frequency in the range of from 25 to 50 kHz.
- a voltage threshold detector 68 having a first output 68 A coupled to the switched mode power supply 16 and a second output 68 B coupled to an “on” time control circuit 70 .
- a microprocessor controller 72 coupled to the operator controls and display (shown in FIG. 1 ) is connected to a control input 66 A of the power supply 66 for adjusting the generator output power by supply voltage variation and to a threshold-set input 68 C of the voltage threshold detector 68 for setting peak RF output voltage limits.
- the microprocessor controller 72 causes power to be applied to the switched mode power supply 66 when electrosurgical power is demanded by the surgeon operating an activation switch arrangement which may be provided on a hand-piece or footswitch (see FIG. 1 ).
- a constant output voltage threshold is set independently on the supply voltage via input 68 C according to control settings on the front panel of the generator (see FIG. 1 ).
- the threshold is set at a desiccation threshold value between 150 volts and 200 volts.
- the threshold is set to a value in the range of from 250 or 300 volts to 600 volts. These voltage values are peak values.
- Their being peak values means that for desiccation at least it is preferable to have an output RF waveform of low crest factor to give maximum power before the voltage is clamped at the values given. Typically a crest factor of 1.5 or less is achieved.
- the voltage output set via input 68 C is constantly alternated between the value for desiccation or coagulation and the value for cutting or vaporisation, to form a blended signal.
- the status of the control input 601 of the RF oscillator 60 (which is connected to the “on” time control circuit 70 ) is “on”, such that the power switching device which forms the oscillating element of the oscillator 60 is switched on for a maximum conduction period during each oscillation cycle.
- the power delivered to the load 64 depends partly on the supply voltage applied to the RF oscillator 60 from the switched mode power supply 66 and partly on the load impedance 64 .
- the voltage threshold for a desiccation output is set to cause trigger signals to be sent to the “on” time control circuit 70 and to the switched mode power supply 66 when the voltage threshold is reached.
- the “on” time control circuit 70 has the effect of virtually instantaneously reducing the “on” time of the RF oscillator-switching device. Simultaneously, the switched mode power supply is disabled so that the voltage supplied to oscillator 60 begins to fall.
- the operation of the generator in this way is described in detail in our European Patent Application No. 0754437, the disclosure of which is hereby incorporated by way of reference.
- FIG. 3 shows one possible design for the electrosurgical instrument 12 .
- the instrument 12 comprises an instrument shaft 5 at the distal end of which is an electrode assembly shown generally at 8 .
- the electrode assembly 8 comprises a central cutting electrode 2 disposed between two larger coagulation electrodes 3 and 40 .
- Insulating layer 4 separates the cutting electrode 2 from the first coagulating electrode 3
- an insulating layer 41 separates the cutting electrode 2 from the second coagulation electrode 40 .
- the cutting electrode 2 protrudes slightly beyond the two coagulating electrodes.
- the generator When the user intends the instrument to cut tissue, the generator applies a cutting RF signal between the cutting electrode 2 and one or both of the two coagulating electrodes 3 and 40 . Conversely, when the user intends the instrument to coagulate tissue, the generator applies a coagulating RF signal between the two coagulating electrodes 3 and 40 .
- the application of the blended RF signal will be described with reference to the switching circuit shown in FIG. 4 .
- FIG. 4 shows a switching circuit shown generally at 45 and comprising input connections 46 and 47 connected respectively to the two output lines 60 C of the generator 10 .
- Switching circuit 45 has three output connections 48 , 49 and 50 .
- Output connection 48 is connected to the cutting electrode 2 in the device of FIG. 3 .
- Output connections 49 and 50 are respectively connected to the coagulating electrodes 3 and 40 in the device of FIG. 3 .
- An electronic switch device 51 is connected between output connections 48 and 49 .
- the switch 51 is capable of rapidly making and breaking the connection between the output lines 48 and 49 .
- a capacitor 53 is connected between the output connections 49 and 50 , the capacitor typically having a value of between 1 and 10 nF.
- the generator supplies alternating bursts of the RF cutting and coagulating signals to the input connections 46 and 47 .
- the switch device 51 operates synchronised with the alternating RF signals such that when that part of the signal containing the cutting signal is received, the switch device is open such that there is open circuit between the output connections 48 and 49 .
- the cutting RF signal is supplied between cutting electrode 2 and coagulating electrode 40 , via output connections 48 and 50 respectively.
- the switching device 51 is closed such that output connections 48 and 49 are in electrical communication one with the other.
- the signal is supplied between the two coagulation electrodes 3 and 40 , via output connections 49 and 50 , with the capacitor 53 providing a potential difference therebetween.
- Switching device 51 mav comprise an AC opto-relay such as the optically coupled dual FET arrangement shown in FIG. 5A .
- Another switching device providing isolation between control circuitry and the output lines is the combination of an AC bridge and a single MOSFET switch controlled via an isolating driver, a shown in FIG. 5B .
- the above description is based upon the generator 10 controlling the blended mode signal, and the switching device 51 opening and closing synchronously therewith. However, this does not have to be the case and the switching device can control the generator in order to determine the changeover between the cutting and coagulation RF signals.
- the switching device 51 opens again, the generator ceases to be current limited, and the signal once again rapidly reverts to being a cutting RF signal. In this way, the opening and closing of the switching device 51 toggles the generator between its cutting and coagulating modes, producing the blended signal which is supplied to the electrodes of the instrument 12 .
- FIG. 6 shows an alternative embodiment of switching circuit, which can be employed if the generator 10 is not a current limited generator, or if it is desired not to use the current limiting features of the generator.
- the switching circuit of FIG. 6 is almost identical to that of FIG. 4 , the main difference being the addition of an additional capacitor 52 in series with the input connection 46 .
- the capacitor 52 typically has a value one half of that of capacitor 53 , such that the voltage delivered across output connections 49 and 50 is divided down to a level typically used for coagulation without reducing the power output of the generator 10 . In this way a cutting RF signal is delivered between output connections 48 and 50 when the switching device 51 is open, and a coagulating RF signal is delivered between output connections 49 and 50 when the switching device is closed.
- Switching circuit 45 can be provided within the electrosurgical instrument 12 , or within the output stage of the generator 10 as shown in FIG. 7 . Wherever the switching circuit 45 is located, the switching device can be provided with an adjustment device 55 , (as shown in FIG. 6 ) operable by the user of the system in order to adjust the timing of the switching device. By operating the adjustment device 55 , the user is able to alter the ratio between that part of the blended RF signal which is a cutting signal, and that part which is a coagulating signal. Whether the adjustment device 55 is located on the instrument 12 or the generator 10 , the user of the system can vary the signal so as to increase or decrease the coagulating component of the blended signal with respect to the cutting component. and vice versa. This gives considerable flexibility to the electrosurgical system in terms of its use as a simultaneous cutting and coagulation device, with user-operable control of how much coagulation is provided.
- the switching device 51 of the alternative switching circuit of FIG. 6 may be as shown in FIG. 5A or FIG. 5B , the driving signal being obtained from a source associated with the switching device itself or from control circuitry within the generator which controls other generator functions.
- FIG. 8A An example of a circuit in which a blended mode signal is generated by elements associated with the switching device and has a variable mark-to-space ratio is shown in FIG. 8A .
- the output of a triangular wave generator 56 is compared in a comparator 57 with a user-adjustable reference voltage to produce a square wave of the switching device 51 ( FIG. 6 ).
- FIG. 8C Another circuit generating an adjustable blended mode switching device control signal is shown in FIG. 8C .
- a user-operable potentiometer 58 is coupled with a timer circuit 59 using a 555 i.c.
- FIG. 9 shows an alternative generator system in which two RF source circuits 74 and 74 ′′ are employed.
- Source circuit 74 comprises RF oscillator 60 and its associated power supply and control elements.
- the source circuit is as described with reference to FIG. 2 , and like elements are given the same reference numerals as in FIG. 2 .
- the second source circuit 74 ′′ comprises a second RF oscillator 60 ′′, along with a second controller 72 ′′, power supply 66 ′′, voltage threshold detector 68 ′′ and on time control circuit 70 ′′.
- FIG. 9 shows the source circuit 74 ′′ as having its own dedicated version of each of these units, although it is feasible that certain of them (such as the power supply 66 ′′ and controller 72 ′′) could be shared with the source circuit 74 .
- the voltage threshold detector 68 is set such that the output connections 60 C from source circuit 74 provide an output power signal having a cutting RF waveform, while the voltage threshold detector 68 ′′ is set such that the output connections 60 C′′ from source circuit 74 ′′ provide an output power signal having a coagulating RF waveform.
- the second oscillator 60 ′′ operates at a different frequency from that of oscillator 60 .
- a common output stage 73 is provided for both source circuits 74 and 74 ′′ .
- Output connections 60 C from source circuit 74 are connected to input connections 46 and 47 of the output stage 73
- output connections 60 C′′ from source circuit 74 ′′ are connected to input connections 46 ′′ and 47 ′′ of the output stage respectively.
- input connections 47 and 47 ′′ are both connected to output connection 49
- input connection 46 is connected to output connection 48
- input connection 46 ′′ to output connection 50 The result of this arrangement is that the cutting RF signal from source circuit 74 is delivered between output connections 48 and 49 and hence to one pair of electrodes on the electrosurgical instrument 12 .
- the coagulating RF signal from source circuit 74 ′′ is delivered betVeen output connections 49 and 50 and hence to a different pair of electrodes of the instrument 12 .
- the electrosurgical instrument 12 is able simultaneously to cut and coagulate tissue by virtue of the two different frequency signals.
- the advantage is that the cutting signal and the coagulating signal, whether they be applied simultaneously or in an alternating blended signal, are delivered to different pairs of electrodes of the electrosurgical instrument.
- the design of these electrodes can therefore be optimised, depending on whether they are intended to cut or coagulate tissue.
- two RF power oscillators 60 - 1 and 60 - 2 are powered from a common power supply 62 and are controlled by a common controller 72 to produce on respective output lines 60 C an RF power signal suitable for cutting and an RF power signal suitable for coagulation.
- These signals may be fed to a switching circuit 63 for selecting the power signal from one oscillator 60 - 1 or the other oscillator 60 - 2 according to inputs from, for instance, foot switches, the selected power signal being transmitted on output connections 80 , 81 .
- the switch is operated repeatedly at a predetermined rate to produce a blended output power signal across connections 80 , 81 .
- the power oscillators 60 - 1 , 60 - 2 are operated at different frequencies, and the respective cut and coagulation signals are fed to the required electrodes by feeding the power signal on output connections 80 , 81 to tuned circuits 82 - 1 and 82 - 2 tuned to the different frequencies.
- the outputs of the tuned circuits are coupled via electrode lines 48 , 49 and 50 to the respective electrodes of the electrosurgical instrument. In this way, the cutting signal from oscillator 60 - 1 is fed to a cutting electrode 48 and a common electrode 49 , whereas the coagulation signal from oscillator 60 - 2 is fed to a coagulation electrode 50 and the common electrode 49 .
- connection between the electrosurgical generator and the electrosurgical instrument is typically provided by output connections 80 and 81 , but the apportionment of circuit blocks between the generator and the instrument may be varied.
- FIGS. 11A and 11B Further embodiments are shown in FIGS. 11A and 11B . Like the embodiment of FIG. 9 , these embodiments dispense with the need for a signal routing switch or switching circuit.
- each tuned circuit has a series-resonant inductor-capacitor pair 84 and a parallel-resonant inductor-capacitor pair 86 , the latter being transformer coupled to output connections 46 and 47 on the one hand and 46 ′′ and 47 ′′ on the other hand.
- each tuned circuit has two inputs, one of which is connected to a generator output connection 80 and the other of which is connected to a generator output connection 81 .
- the generator has an output stage comprising RF switches arranged in two oppositely acting push-pull pairs 90 A, 90 B and 91 A, 91 B.
- these switches comprise power MOSFETS.
- Each switch 90 A, 90 B, 91 A, 91 B is connected to driver inputs 92 , 93 , as shown, which receive an RF drive signal which, for producing on the output connections 80 , 81 an output having a cut waveform is at one RF frequency, and for producing a coagulation output on the output connections 80 , 81 , has a different RF frequency, these frequencies being, respectively, the resonant frequency of, the resonant combinations 84 , 86 of the first tuned circuit 82 - 1 and, the resonant frequency of the corresponding resonant combinations of the other tuned circuit 82 - 2 .
- the RF switches 90 A, 90 B, 91 A and 91 B of the generator output stage may be driven according to, for instance, a footswitch control to produce a cut output or a coagulation output.
- a blended output may be produced in which the RF frequency alternates constantly between the two resonant frequencies of the tuned output circuits.
- FIG. 11B is a modification of that of FIG. 11A , in which the generator output stage has a single push-pull pair of RF switches 90 A, 90 B and in which the tuned circuits each have one input connected to the junction between the switches 90 A, 90 B and the other input connected to ground.
Abstract
An electrosurgical system includes a generator for generating radio frequency power, and an electrosurgical instrument including at least three electrodes and. The generator includes a radio frequency output stage having at least a pair of RF output lines, and a power supply coupled to the output stage for supplying power to the output stage. A controller is operable to limit the radio frequency output voltage developed across the output lines to at least a first predetermined threshold value to produce a cutting RF waveform, and a second threshold value to produce a coagulating RF waveform. In a combined mode, the controller delivers both cutting and coagulating waveforms, either simultaneously or by alternating constantly between the first and second threshold values to form a blended signal. The system also includes means for feeding the waveform to the three or more electrodes such that the cutting RF waveform is delivered between a first pair of the electrodes, and the coagulating waveform is delivered between a second pair of the electrodes.
Description
- This is a continuation-in-part of U.S. application Ser. No. 10/228,284 filed Aug. 27, 2002 which claims the benefit of U.S. provisional application Ser. No. 60/314,650, filed Aug. 27, 2001, the entire contents of both being incorporated herein by reference.
- This invention relates to an electrosurgical generator, and to an electrosurgical system comprising a generator and an electrosurgical instrument with two or more treatment electrodes. Such systems are commonly used for the cutting and/or coagulation of tissue in surgical intervention, most commonly in “keyhole” or minimally invasive surgery, but also in laparoscopic or “open” surgery.
- It is known to provide electrosurgical generators which provide different radio frequency signals for cutting and coagulation, and also to provide a blended signal in which the generator rapidly alternates between the signals for cutting and coagulation. Our U.S. Pat. No. 6,416,509 and also U.S. Pat. No. 3,885,569 to Judson describe blended signals of this type.
- The present invention provides an improvement to this type of electrosurgical system, in that the cutting and coagulation waveforms are delivered to different electrodes of the electrosurgical instrument. Accordingly, there is provided an electrosurgical system including a generator system for generating radio frequency (RF) power, and an electrosurgical instrument including at least three electrodes, the generator system comprising one or more sources of RF output power, and a controller operable to control the generator system such that it is capable of delivering a first cutting RF waveform to the electrosurgical instrument or a second coagulating RF waveform to the electrosurgical instrument, and, in a combined mode, to deliver both first and second RF waveforms, the system also including means for feeding the waveform to the three or more electrodes such that, in the combined mode, the cutting RF waveforms is delivered between a first pair of the three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes.
- Our pending European patent application EP 02255826.6 describes an electrosurgical system in which the operator can select between a cutting signal and a coagulation signal. When the cutting signal is selected, it is supplied to one pair of electrosurgical electrodes, and when the coagulation signal is selected it is supplied to a different pair of electrosurgical electrodes. The present invention is an improvement to this system, in that it also provides a combined mode of operation, but with the different components of the combined signal being supplied to different sets of electrosurgical electrodes.
- The “combined mode” of the generator can be provided in different ways. In one arrangement, the generator system comprises a single source of radio frequency power, and, in the combined mode, the controller is operable to cause the generator system to alternate constantly between delivering the first cutting RF waveform and the second coagulating RF waveform. This is the more traditional “blended” signal of U.S. Pat. Nos. 6,416,509 and U.S. Pat. No. 3,885,569. Alternatively, the generator system comprises at least first and second sources of radio frequency power, operating at different frequencies, the first source of radio frequency power being adapted to deliver the first cutting RF waveform, and the second source of radio frequency power being adapted to deliver the second coagulating RPF waveform, and, in the combined mode, the controller is operable to cause the generator system to deliver both the first and second RF waveforms simultaneously. This is a different arrangement in which the output of two RF sources is supplied to the instrument simultaneously. Both arrangements have the effect, however, of supplying both cutting and coagulating RF signals to the electrosurgical instrument while the instrument is in use.
- Where the alternating blended signal is employed, the means for connecting the waveform conveniently comprises a switching circuit for varying the connections between the source and the three or more electrodes such that, in the combined mode, a first part of the combined signal that is the cutting RF waveform is delivered between a first pair of the three or more electrodes, and a second part of the combined signal that is the coagulating RF waveform is delivered between a second pair of the three or more electrodes.
- In a convenient arrangement, the switching circuit of the generator is such that, in the combined mode, the connections between the power supply and the electrodes are switched such that the first part of the blend signal is delivered between the first and second electrodes, and the second part of the blend signal is delivered between the second and third electrodes. In this arrangement, there is a common electrode which is used in both the cutting and coagulation operations, but it is equally feasible to have completely different pairs of electrodes for each function.
- Preferably, the switching circuit comprises first and second input connections, first second and third output connections, and an electronic switch connected between the first and second output connections, and being adapted to open and close in order to connect the first and second output connections periodically one to the other. The electronic switch conveniently opens and closes at a frequency of between 5 and 100 Hz. In this arrangement, the second and third output connections are preferably connected one to the other via a capacitor, typically one having a value of between 1 and 10 nF. The switching circuit is conveniently housed in the electrosurgical instrument, although it can alternatively be housed in the electrosurgical generator.
- Conveniently, the controller within the generator is adapted to determine the timing of the changes between the first and second parts of the combined signal, and the switching circuit is synchronised to operate in response thereto, so as to deliver the first and second parts of the combined signal respectively to the first and second pairs of electrodes. Alternatively, the switching circuit is adapted to determine the timing of the changes between the first and second parts of the combined signal, and the controller is adapted to operate in response thereto.
- Where the combined signal is provided by first and second RF sources acting simultaneously, means for connecting the waveform conveniently comprises one or more output stages arranged such that the cutting RF waveform from the first RF source is delivered between a first pair of the three or more electrodes, and the coagulating waveform from the second RF source is delivered between a second pair of the three or more electrodes. In this way the first and second sources are “hard wired” to deliver their respective waveforms to different output connections, and hence to different pairs of electrodes. Thus the need for active switching of the connections using a switching circuit is avoided, but the power requirements needed for the operation of two RF sources may make this construction unsuitable for some arrangements, such as those in which the generator system is housed within the handpiece of the electrosurgical instrument.
- The invention further resides in an electrosurgical system including a generator system for generating RF power, and an electrosurgical instrument including at least three electrodes, the generator system comprising at least one RF output stage, means for supplying power to the at least one output stage, and a controller operable to limit the radio frequency output voltage developed by the at least one output stage to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a combined mode, to deliver waveforms limited to both first and second threshold values, the electrosurgical system also including means for coupling the waveform to the three or more electrodes such that, in the combined mode, a waveform limited to the first threshold value for cutting or vaporisation is delivered between a first pair of the three or more electrodes, and a waveform limited to the second threshold value for coagulation is delivered between a second pair of the three or more electrodes.
- The invention further resides in an electrosurgical generator for supplying RF power to an electrosurgical instrument, the generator comprising at least one RF output stage, three more output connections for the delivery of RF power to the electrosurgical instrument, means for supplying power to the at least one output stage, a controller operable to limit the RF output voltage developed by the at least one output stage to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a combined mode, to deliver waveforms limited to both first and second threshold values, and means for feeding the waveforms to the three or more output connections such that, in the combined mode, the waveform that is limited to the first threshold value for cutting or vaporisation is delivered between a first pair of the three or more output connections, and the waveform that is limited to the second threshold value for coagulation is delivered between a second pair of the three or more output connections.
- The invention further resides in an electrosurgical system including a generator for generating RF power, and an electrosurgical instrument including at least two electrodes, the generator comprising a RF output stage having two or more output connections, each in electrical connection with a respective one of the at least two electrodes, a power supply coupled to the output stage for supplying power to the output stage, a controller operable to limit the RF output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation.
- The electrosurgical system of U.S. Pat. No. 6,416,509 is such that the frequency of the blended signal can be pre-set to match the type of electrode intended for use. There is nothing in U.S. Pat. No. 6,416,509 to suggest that the blend ratio (i.e. the ratio of that part of the blended signal that is a cutting or vaporisation signal, as compared with that part which is a coagulation signal) can be pre-set, let alone easily adjusted by the user of the system. Preferably the adjustment means is carried by the electrosurgical instrument, but the adjustment means can also conceivably be mounted on the generator.
- The invention will be further described below, by way of example only, with reference to the accompanying drawings.
- In the drawings:
-
FIG. 1 is a schematic diagram of an electrosurgical system in accordance with the present invention, -
FIG. 2 is a block diagram of the generator ofFIG. 1 , -
FIG. 3 is a schematic perspective view of an electrosurgical instrument used as a part of the system ofFIG. 1 , -
FIG. 4 is a schematic diagram of a switching circuit used in the system ofFIG. 1 , -
FIGS. 5A and 5B are circuit diagrams of two electronic switching devices for the switching circuit ofFIG. 4 , -
FIG. 6 is a schematic diagram of an alternative embodiment of switching circuit which can be used in the system ofFIG. 1 , -
FIG. 7 is a block diagram of a generator in accordance withFIG. 2 , incorporating a switching circuit in accordance withFIG. 4 , -
FIGS. 8A to 8C are diagrams illustrating techniques for adjusting a blend switching ratio,FIGS. 8A and 8C being circuit diagrams of alternative ratio adjusting devices andFIG. 8B being a waveform diagram illustrating the operation of the device ofFIG. 8A , -
FIG. 9 is a block diagram of an alternative embodiment of generator system in accordance with the present invention, -
FIG. 10 is a block diagram of a further alternative system in accordance with the invention, and -
FIGS. 11A and 11B are yet further alternative systems for feeding cut and coagulation outputs automatically to different respective electrode pairs. - Referring to
FIG. 1 , agenerator 10 has anoutput socket 10S providing a radio frequency (RF) output for aninstrument 12 via aconnection cord 14. Activation of the generator may be performed from theinstrument 12 via a connection incord 14 or by means of afootswitch unit 16, as shown, connected to the rear of the generator by afootswitch connection cord 18. In the illustratedembodiment footswitch unit 16 has twofootswitches push buttons display 24. Pushbuttons 26 are provided as an alternative means for selection between coagulation and cutting modes. - Referring to
FIG. 2 , the generator comprises a radio frequency (RF)power oscillator 60 having a pair ofoutput lines 60C for coupling to theinstrument 12. Theinstrument 12 is shown inFIG. 2 in the form of anelectrical load 64. Power is supplied to theoscillator 60 by a switchedmode power supply 66. In the preferred embodiment, theRF oscillator 60 operates at about 400 kHz, with any frequency from 300 kHz upwards into the HF range being feasible. The switched mode power supply typically operates at a frequency in the range of from 25 to 50 kHz. Coupled across theoutput lines 60C is avoltage threshold detector 68 having afirst output 68A coupled to the switchedmode power supply 16 and asecond output 68B coupled to an “on”time control circuit 70. Amicroprocessor controller 72 coupled to the operator controls and display (shown inFIG. 1 ) is connected to acontrol input 66A of thepower supply 66 for adjusting the generator output power by supply voltage variation and to a threshold-setinput 68C of thevoltage threshold detector 68 for setting peak RF output voltage limits. - In operation, the
microprocessor controller 72 causes power to be applied to the switchedmode power supply 66 when electrosurgical power is demanded by the surgeon operating an activation switch arrangement which may be provided on a hand-piece or footswitch (seeFIG. 1 ). A constant output voltage threshold is set independently on the supply voltage viainput 68C according to control settings on the front panel of the generator (seeFIG. 1 ). Typically, for desiccation or coagulation the threshold is set at a desiccation threshold value between 150 volts and 200 volts. When a cutting or vaporisation output is required the threshold is set to a value in the range of from 250 or 300 volts to 600 volts. These voltage values are peak values. Their being peak values means that for desiccation at least it is preferable to have an output RF waveform of low crest factor to give maximum power before the voltage is clamped at the values given. Typically a crest factor of 1.5 or less is achieved. When a combined mode output is required, the voltage output set viainput 68C is constantly alternated between the value for desiccation or coagulation and the value for cutting or vaporisation, to form a blended signal. - When the generator is first activated, the status of the
control input 601 of the RF oscillator 60 (which is connected to the “on” time control circuit 70) is “on”, such that the power switching device which forms the oscillating element of theoscillator 60 is switched on for a maximum conduction period during each oscillation cycle. The power delivered to theload 64 depends partly on the supply voltage applied to theRF oscillator 60 from the switchedmode power supply 66 and partly on theload impedance 64. The voltage threshold for a desiccation output is set to cause trigger signals to be sent to the “on”time control circuit 70 and to the switchedmode power supply 66 when the voltage threshold is reached. The “on”time control circuit 70 has the effect of virtually instantaneously reducing the “on” time of the RF oscillator-switching device. Simultaneously, the switched mode power supply is disabled so that the voltage supplied tooscillator 60 begins to fall. The operation of the generator in this way is described in detail in our European Patent Application No. 0754437, the disclosure of which is hereby incorporated by way of reference. -
FIG. 3 shows one possible design for theelectrosurgical instrument 12. Theinstrument 12 comprises aninstrument shaft 5 at the distal end of which is an electrode assembly shown generally at 8. Theelectrode assembly 8 comprises acentral cutting electrode 2 disposed between twolarger coagulation electrodes layer 4 separates the cuttingelectrode 2 from thefirst coagulating electrode 3, while an insulatinglayer 41 separates the cuttingelectrode 2 from thesecond coagulation electrode 40. The cuttingelectrode 2 protrudes slightly beyond the two coagulating electrodes. - When the user intends the instrument to cut tissue, the generator applies a cutting RF signal between the cutting
electrode 2 and one or both of the two coagulatingelectrodes electrodes FIG. 4 . -
FIG. 4 shows a switching circuit shown generally at 45 and comprisinginput connections output lines 60C of thegenerator 10.Switching circuit 45 has threeoutput connections Output connection 48 is connected to the cuttingelectrode 2 in the device ofFIG. 3 .Output connections electrodes FIG. 3 . Anelectronic switch device 51 is connected betweenoutput connections switch 51 is capable of rapidly making and breaking the connection between theoutput lines capacitor 53 is connected between theoutput connections - When the user actuates the
footswitches instrument 12 in the blended mode, the generator supplies alternating bursts of the RF cutting and coagulating signals to theinput connections switch device 51 operates synchronised with the alternating RF signals such that when that part of the signal containing the cutting signal is received, the switch device is open such that there is open circuit between theoutput connections electrode 2 and coagulatingelectrode 40, viaoutput connections input connections device 51 is closed such thatoutput connections coagulation electrodes output connections capacitor 53 providing a potential difference therebetween. -
Switching device 51 mav comprise an AC opto-relay such as the optically coupled dual FET arrangement shown inFIG. 5A . Another switching device providing isolation between control circuitry and the output lines is the combination of an AC bridge and a single MOSFET switch controlled via an isolating driver, a shown inFIG. 5B . - The above description is based upon the
generator 10 controlling the blended mode signal, and theswitching device 51 opening and closing synchronously therewith. However, this does not have to be the case and the switching device can control the generator in order to determine the changeover between the cutting and coagulation RF signals. - Consider the switching
circuit 45 as shown inFIG. 4 . When theswitching device 51 is in its open condition, the cutting signal is supplied acrossoutput connections switching device 51 closes, the cutting signal is initially supplied between theoutput connections capacitor 53. This causes the current delivered by the generator to rise rapidly such that the current limiting circuitry within the generator operates to reduce the power being delivered, such that the signal rapidly converts to an RF signal typical for coagulation. The effect of the current limiting circuitry within the generator is that the closing of theswitching device 51 causes the signal being delivered to be transformed, almost instantaneously, from a cutting signal to a coagulating signal. Conversely, when theswitching device 51 opens again, the generator ceases to be current limited, and the signal once again rapidly reverts to being a cutting RF signal. In this way, the opening and closing of theswitching device 51 toggles the generator between its cutting and coagulating modes, producing the blended signal which is supplied to the electrodes of theinstrument 12. -
FIG. 6 shows an alternative embodiment of switching circuit, which can be employed if thegenerator 10 is not a current limited generator, or if it is desired not to use the current limiting features of the generator. The switching circuit ofFIG. 6 is almost identical to that ofFIG. 4 , the main difference being the addition of anadditional capacitor 52 in series with theinput connection 46. Thecapacitor 52 typically has a value one half of that ofcapacitor 53, such that the voltage delivered acrossoutput connections generator 10. In this way a cutting RF signal is delivered betweenoutput connections switching device 51 is open, and a coagulating RF signal is delivered betweenoutput connections -
Switching circuit 45 can be provided within theelectrosurgical instrument 12, or within the output stage of thegenerator 10 as shown inFIG. 7 . Wherever the switchingcircuit 45 is located, the switching device can be provided with anadjustment device 55, (as shown inFIG. 6 ) operable by the user of the system in order to adjust the timing of the switching device. By operating theadjustment device 55, the user is able to alter the ratio between that part of the blended RF signal which is a cutting signal, and that part which is a coagulating signal. Whether theadjustment device 55 is located on theinstrument 12 or thegenerator 10, the user of the system can vary the signal so as to increase or decrease the coagulating component of the blended signal with respect to the cutting component. and vice versa. This gives considerable flexibility to the electrosurgical system in terms of its use as a simultaneous cutting and coagulation device, with user-operable control of how much coagulation is provided. - As in the arrangement described above in
FIG. 4 , the switchingdevice 51 of the alternative switching circuit ofFIG. 6 may be as shown inFIG. 5A orFIG. 5B , the driving signal being obtained from a source associated with the switching device itself or from control circuitry within the generator which controls other generator functions. - Various circuits for implementing the
adjustment device 55 will be apparent to those skilled in the art. An example of a circuit in which a blended mode signal is generated by elements associated with the switching device and has a variable mark-to-space ratio is shown inFIG. 8A . In this case, the output of atriangular wave generator 56 is compared in acomparator 57 with a user-adjustable reference voltage to produce a square wave of the switching device 51 (FIG. 6 ). Another circuit generating an adjustable blended mode switching device control signal is shown inFIG. 8C . Here, a user-operable potentiometer 58 is coupled with atimer circuit 59 using a 555 i.c. -
FIG. 9 shows an alternative generator system in which twoRF source circuits Source circuit 74 comprisesRF oscillator 60 and its associated power supply and control elements. The source circuit is as described with reference toFIG. 2 , and like elements are given the same reference numerals as inFIG. 2 . Thesecond source circuit 74″ comprises asecond RF oscillator 60″, along with asecond controller 72″,power supply 66″,voltage threshold detector 68″ and ontime control circuit 70″.FIG. 9 shows thesource circuit 74″ as having its own dedicated version of each of these units, although it is feasible that certain of them (such as thepower supply 66″ andcontroller 72″) could be shared with thesource circuit 74. Thevoltage threshold detector 68 is set such that theoutput connections 60C fromsource circuit 74 provide an output power signal having a cutting RF waveform, while thevoltage threshold detector 68″ is set such that theoutput connections 60C″ fromsource circuit 74″ provide an output power signal having a coagulating RF waveform. Thesecond oscillator 60″ operates at a different frequency from that ofoscillator 60. - A
common output stage 73 is provided for bothsource circuits Output connections 60C fromsource circuit 74 are connected to inputconnections output stage 73, whileoutput connections 60C″ fromsource circuit 74″ are connected to inputconnections 46″ and 47″ of the output stage respectively. Within theoutput stage 73,input connections output connection 49, whileinput connection 46 is connected tooutput connection 48, andinput connection 46″ tooutput connection 50. The result of this arrangement is that the cutting RF signal fromsource circuit 74 is delivered betweenoutput connections electrosurgical instrument 12. Simultaneously, the coagulating RF signal fromsource circuit 74″ is deliveredbetVeen output connections instrument 12. Thus theelectrosurgical instrument 12 is able simultaneously to cut and coagulate tissue by virtue of the two different frequency signals. As before, the advantage is that the cutting signal and the coagulating signal, whether they be applied simultaneously or in an alternating blended signal, are delivered to different pairs of electrodes of the electrosurgical instrument. The design of these electrodes can therefore be optimised, depending on whether they are intended to cut or coagulate tissue. - Referring to
FIG. 10 , in an further alternative generator and instrument combination, two RF power oscillators 60-1 and 60-2 are powered from acommon power supply 62 and are controlled by acommon controller 72 to produce onrespective output lines 60C an RF power signal suitable for cutting and an RF power signal suitable for coagulation. These signals may be fed to aswitching circuit 63 for selecting the power signal from one oscillator 60-1 or the other oscillator 60-2 according to inputs from, for instance, foot switches, the selected power signal being transmitted onoutput connections connections output connections electrode lines electrode 48 and acommon electrode 49, whereas the coagulation signal from oscillator 60-2 is fed to acoagulation electrode 50 and thecommon electrode 49. - In the embodiment shown in
FIG. 10 , the connection between the electrosurgical generator and the electrosurgical instrument is typically provided byoutput connections - Further embodiments are shown in
FIGS. 11A and 11B . Like the embodiment ofFIG. 9 , these embodiments dispense with the need for a signal routing switch or switching circuit. - Referring to
FIG. 11 , there are provided two tuned circuits 82-1 and 82-2 (as inFIG. 10 ), tuned to different frequencies. Each has a series-resonant inductor-capacitor pair 84 and a parallel-resonant inductor-capacitor pair 86, the latter being transformer coupled tooutput connections FIG. 10 , each tuned circuit has two inputs, one of which is connected to agenerator output connection 80 and the other of which is connected to agenerator output connection 81. In this embodiment, the generator has an output stage comprising RF switches arranged in two oppositely acting push-pull pairs switch output connections output connections resonant combinations - The embodiment of
FIG. 11B is a modification of that ofFIG. 11A , in which the generator output stage has a single push-pull pair of RF switches 90A, 90B and in which the tuned circuits each have one input connected to the junction between theswitches
Claims (10)
1.-20. (canceled)
21. An electrosurgical system including a generator for generating radio frequency power, and an electrosurgical instrument including at least two electrodes, the generator comprising:
(i) a radio frequency output stage having two or more output connections, each in electrical connection with a respective one of the at least two electrodes,
(ii) a power supply coupled to the output stage for supplying power to the output stage,
(iii) a controller operable to limit the radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and
(iv) adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation.
22. The electrosurgical system according to claim 21 wherein the adjustment means is carried by the electrosurgical instrument.
23. The electrosurgical system according to claim 21 wherein the adjustment means is mounted on the generator.
24. An electrosurgical system including a generator for generating radio frequency power and an electrosurgical instrument including at least two electrodes, the generator comprising:
a radio frequency output stage having a plurality of output connections, each output connections being in electrical connection with a respective one of the at least two electrodes,
a power supply coupled to the output stage for supplying radio frequency power to the output stage,
a controller operable to limit the radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and
a switching circuit comprising:
three or more output connections,
a switching device for feeding the radio frequency output voltage to the three or more output connections, such that, in the blend mode, the cutting RF waveforms is delivered between a first pair of the three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes, and
an adjustment device for adjusting the timing of the switching device to alter the ratio between a first part of the blended RF signal that is a cutting signal and a second part of the blended RF signal that is a coagulating signal.
25. The electrosurgical system according to claim 24 , wherein the adjustment device is operable by a user of the system.
26. The electrosurgical system according to claim 24 , wherein the three or more output connections are comprised of a first output connection connected to a cutting electrode of the electrosurgical instrument and second and third output connections connected to coagulation electrodes of the electrosurgical instrument, and wherein the switching device is connected between the first and second output connections so that the radio frequency cutting signal is supplied between cutting electrode and one of the coagulating electrodes when the switching device is open, and so that the radio frequency coagulating voltage is supplied between the two coagulation electrodes when the switching device is closed.
27. An electrosurgical system including a generator for generating radio frequency power and an electrosurgical instrument including a cutting g electrode and first and second coagulation electrodes, the generator comprising:
an output stage having first, second and third output connections, the first output connection being connected to the cutting electrode of the electrosurgical instrument, and the second and third output connections being connected to the first and second coagulation electrodes of the electrosurgical instrument,
a power supply coupled to the output stage for supplying radio frequency power to the output stage,
a controller operable to limit radio frequency output voltage developed across the output connections to a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values, and
a switching device for supplying the radio frequency cutting signal between the cutting electrode and one of the coagulating electrodes when the switching device is in a first state, and for supplying the radio frequency coagulating voltage between the two coagulation electrodes when the switching device is in a second state, and
an adjustment device for adjusting the timing of the switching device to alter the ratio between a first part of the blended RF signal that is a cutting signal and a second part of the blended RF signal that is a coagulating signal.
28. The electrosurgical system according to claim 27 , wherein, in the first state, the switching device is open, and, in the second state, the switching device is closed.
29. An electrosurgical system including a generator for generating radio frequency power, and an electrosurgical instrument including three or more electrodes, the generator comprising:
means for supplying radio frequency power,
means for outputting the radio frequency output power, the output means having a plurality of output connections, each in electrical connection with a respective one of the three or more electrodes,
means for limiting radio frequency output voltage developed across the output connections to at least a first predetermined threshold value for cutting or vaporisation and a second threshold value for coagulation and, in a blend mode, to alternate constantly between the first and second threshold values,
switching means for delivering the radio frequency output voltage to the plurality of output connections, such that, in the blend mode, the cutting RF waveforms is delivered between a first pair of the plurality of three or more electrodes, and the coagulating RF waveform is delivered between a second pair of the electrodes, and
adjustment means, operable by a user of the electrosurgical system, for varying the ratio of the blend mode so as to vary the part of the blend signal that is limited to the first threshold value for cutting or vaporisation, as compared with the part of the blend signal that is limited to the second threshold value for coagulation.
Priority Applications (1)
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US11/258,916 US20060047275A1 (en) | 2001-08-27 | 2005-10-27 | Electrical generator and system |
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US31465001P | 2001-08-27 | 2001-08-27 | |
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GB0212162A GB0212162D0 (en) | 2002-05-27 | 2002-05-27 | Electrosurgical system |
US10/228,284 US6984231B2 (en) | 2001-08-27 | 2002-08-27 | Electrosurgical system |
US10/378,676 US6966907B2 (en) | 2001-08-27 | 2003-03-05 | Electrosurgical generator and system |
US11/258,916 US20060047275A1 (en) | 2001-08-27 | 2005-10-27 | Electrical generator and system |
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US10/378,676 Division US6966907B2 (en) | 2001-08-27 | 2003-03-05 | Electrosurgical generator and system |
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Also Published As
Publication number | Publication date |
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US7491199B2 (en) | 2009-02-17 |
US6966907B2 (en) | 2005-11-22 |
US20030163124A1 (en) | 2003-08-28 |
US20070173809A1 (en) | 2007-07-26 |
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