CA2512904A1 - An electrosurgical generator - Google Patents

An electrosurgical generator Download PDF

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Publication number
CA2512904A1
CA2512904A1 CA002512904A CA2512904A CA2512904A1 CA 2512904 A1 CA2512904 A1 CA 2512904A1 CA 002512904 A CA002512904 A CA 002512904A CA 2512904 A CA2512904 A CA 2512904A CA 2512904 A1 CA2512904 A1 CA 2512904A1
Authority
CA
Canada
Prior art keywords
output
power
generator according
generator
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002512904A
Other languages
French (fr)
Other versions
CA2512904C (en
Inventor
Colin Charles Owen Goble
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gyrus Medical Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0300508A external-priority patent/GB0300508D0/en
Priority claimed from GB0317728A external-priority patent/GB0317728D0/en
Application filed by Individual filed Critical Individual
Publication of CA2512904A1 publication Critical patent/CA2512904A1/en
Application granted granted Critical
Publication of CA2512904C publication Critical patent/CA2512904C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • 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
    • A61B18/14—Probes or electrodes therefor
    • A61B18/149—Probes or electrodes therefor bow shaped or with rotatable body at cantilever end, e.g. for resectoscopes, or coagulating rollers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00666—Sensing and controlling the application of energy using a threshold value
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00684—Sensing and controlling the application of energy using lookup tables
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00696—Controlled or regulated parameters
    • A61B2018/00702—Power or energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00696—Controlled or regulated parameters
    • A61B2018/00702—Power or energy
    • A61B2018/00708—Power or energy switching the power on or off
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00779—Power or energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • 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
    • A61B2018/1213—Generators therefor creating an arc

Abstract

An electrosurgical generator for supplying RF power to an electrosurgical instrument for cutting or vaporising tissue has an RF output stage (42) with an RF power bridge (Q1, Q2, Q3, Q4), a pair of output lines (74) and a serie s- resonant output network (48). The output impedance of the output stage (42) at the output lines (74) is less than 200/.sqroot.P ohms, where P is the maximu m continuous RF output power of the generator. The generator offers improved cutting and vaporising performance, especially in relation to the reliabilit y with which an arc can be struck when presented with an initial low impedance load. Overloading of the output stage is prevented by rapidly operating protection circuitry responsive to a predetermined electrical condition such as a substantial short-circuit across the output lines. In the preferred embodiment, the output stage is capable of maintaining output pulses at leas t 1kW peak by supplying the power bridge from a large reservoir capacitor (60) . Pulsing is dynamically variable in response to load conditions by controllin g the maximum energy per pulse in response to the reservoir capacitor voltage.

Claims (16)

1. An electrosurgical generator for supplying radio frequency (RF) power to an electrosurgical instrument for cutting or vaporising tissue, wherein the generator comprises an RF output stage having:
at least one RF power device, at least one pair of output lines for delivering RF power to the instrument, and a series-resonant output network coupled between the RF power device and the said pair of output lines, wherein the output impedance of the output stage at the output lines is less than 200/.sqroot.P ohms, where P is the maximum continuous RF output power of the generator in watts, and wherein the generator further comprises protection circuitry responsive to a predetermined electrical condition indicative of an output current overload substantially to interrupt the RF power supplied to the output network.
2. A generator according to claim 1, further comprising protection circuitry responsive to application of a short circuit across the output lines, and wherein the series-resonant output network is such that the rate of rise of the output current at the output lines when the short circuit is applied is less than (.sqroot.P)/4 amps per microsecond.
3. A generator according to claim 1, further comprising protection circuitry responsive to application of a short circuit across the output lines, and wherein the protection circuitry is responsive to the said short circuit sufficiently quickly to disable the RF power device before the current passing therethrough rises to a rated maximum current as a result of the short circuit.
4, A generator according to claim 3, wherein the power device is disabled in response to the application of the short circuit to the output lines, the disabling occurring in a time period corresponding to less than 3 RF cycles of the delivered RF
power.
5. A generator according to any preceding claim, wherein the predetermined electrical condition is indicative of an instantaneous current in the output stage exceeding a predetermined level, and wherein the speed of response of the protection circuitry is such that the said condition is detected within the RF cycle during which the instantaneous current exceeds the said level.
6. A generator according to any preceding claim, including:
a power supply stage coupled to the RF output stage, the power supply including a charge-storing element for supplying power to the power device or devices and a voltage-sensing circuit arranged to sense the voltage supplied to the RF
output stage by the charge-storing element; and a pulsing circuit coupled to the voltage sensing circuit for pulsing the or each power device, the arrangement of the voltage sensing and pulsing circuits being such that the timing of the pulses is controlled in response to the sensed voltage.
7. A generator according to claim 6, wherein the voltage sensing circuit and the pulsing circuit are arranged to terminate individual pulses of RF energy delivered by the RF power device or devices when the sensed voltage falls below a predetermined level.
8. A generator according to claim 7, wherein the predetermined level is set such that the pulse termination occurs when the voltage falls by a predetermined percentage value of between 5 percent and 20 percent.
9. A generator according to claim 6 or claim 7, wherein the predetermined level is set such that pulse termination occurs when the peak RF voltage delivered at the output lines has fallen to a value of between 25V and 100V below its starting value for the respective pulse.
10. A generator according to any of claims 6 to 9, wherein the power supply and pulsing circuit are arranged to generate a pulsed RF output signal at the output terminals, which signal has a peak current of at least 1A, a simultaneous peak voltage of at least 300 V, a modulation rate of between 5Hz and 2kHz, and a pulse length of between 100µs and 5ms.
11. A generator according to claim 10, wherein the pulse length is between 0.5ms and 5ms.
12. A generator according to claim 10 or claim 11, wherein the pulse duty cycle is between 1% and 20%.
13. A generator according to any of claims 10 to 12, wherein the power supply and pulsing circuit are arranged to generate a pulsed RF output signal at the output terminals, which signal has a peak voltage of at least 300 V thoughout the entire pulse length.
14. A generator according to any of claim 10 to 13, wherein the power supply and the pulsing circuit are arranged to generate, in an initial period, a pulsed r.f.
output signal at the output terminals, which signal has a peak current of at least 1A, a simultaneous peak voltage of at least 300V, a modulation rate of between 5Hz and 2kHz, and a pulse length of between 100µs and 5ms, and, in a subsequent period, to generate a constant power r.f. output signal at the output terminals.
15. An electrosurgical generator according to any preceding claim, wherein the generator is for supplying radio frequency (RF) power to an electrosurgical instrument for cutting or vaporising tissue in wet field electrosurgery, and wherein the output impedance of the output stake at the output lines is less than 10 ohms.
16. An electrosurgical generator according to any of claims 1 to 14, wherein the generator is for supplying radio frequency (RF) power to an electrosurgical instrument for cutting or vaporising tissue in dry field electrosurgery, and wherein the output impedance of the output stage at the output lines is less than 50 ohms.
CA2512904A 2003-01-09 2003-12-19 An electrosurgical generator Expired - Lifetime CA2512904C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB0300508A GB0300508D0 (en) 2003-01-09 2003-01-09 An electrosurgical generator
GB0300508.9 2003-01-09
GB0317728A GB0317728D0 (en) 2003-07-29 2003-07-29 An electrosurgical generator
GB0317728.4 2003-07-29
PCT/GB2003/005585 WO2004062516A1 (en) 2003-01-09 2003-12-19 An electrosurgical generator

Publications (2)

Publication Number Publication Date
CA2512904A1 true CA2512904A1 (en) 2004-07-29
CA2512904C CA2512904C (en) 2011-06-14

Family

ID=32715165

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2512904A Expired - Lifetime CA2512904C (en) 2003-01-09 2003-12-19 An electrosurgical generator

Country Status (10)

Country Link
US (2) US7211081B2 (en)
EP (2) EP1581128B1 (en)
JP (1) JP4463113B2 (en)
CN (1) CN1323649C (en)
AT (1) ATE363236T1 (en)
AU (1) AU2003290301B2 (en)
CA (1) CA2512904C (en)
DE (1) DE60314184T2 (en)
ES (1) ES2286487T3 (en)
WO (1) WO2004062516A1 (en)

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