US3923063A - Pulse control circuit for electrosurgical units - Google Patents
Pulse control circuit for electrosurgical units Download PDFInfo
- Publication number
- US3923063A US3923063A US488281A US48828174A US3923063A US 3923063 A US3923063 A US 3923063A US 488281 A US488281 A US 488281A US 48828174 A US48828174 A US 48828174A US 3923063 A US3923063 A US 3923063A
- Authority
- US
- United States
- Prior art keywords
- signal
- control circuit
- duty cycle
- circuit
- threshold
- 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.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims description 2
- 230000015271 coagulation Effects 0.000 abstract description 26
- 238000005345 coagulation Methods 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000523 sample Substances 0.000 description 24
- 238000000034 method Methods 0.000 description 7
- 230000023597 hemostasis Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 210000004204 blood vessel Anatomy 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Images
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
- A61B18/16—Indifferent or passive electrodes for grounding
-
- 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
- A61B2018/00642—Sensing and controlling the application of energy with feedback, i.e. closed loop control
-
- 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
- A61B2018/00726—Duty cycle
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Otolaryngology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
Claims (5)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US488281A US3923063A (en) | 1974-07-15 | 1974-07-15 | Pulse control circuit for electrosurgical units |
US05/582,593 US4024467A (en) | 1974-07-15 | 1975-06-02 | Method for controlling power during electrosurgery |
AU82973/75A AU8297375A (en) | 1974-07-15 | 1975-07-11 | Pulse control circuit and method for electrosurgical units |
JP50085919A JPS5136791A (en) | 1974-07-15 | 1975-07-15 | |
JP50119041A JPS5211683A (en) | 1974-07-15 | 1975-10-03 | Method of controlling pulse modulation output mean power of electric surgical operation device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US488281A US3923063A (en) | 1974-07-15 | 1974-07-15 | Pulse control circuit for electrosurgical units |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/582,593 Division US4024467A (en) | 1974-07-15 | 1975-06-02 | Method for controlling power during electrosurgery |
Publications (1)
Publication Number | Publication Date |
---|---|
US3923063A true US3923063A (en) | 1975-12-02 |
Family
ID=23939087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US488281A Expired - Lifetime US3923063A (en) | 1974-07-15 | 1974-07-15 | Pulse control circuit for electrosurgical units |
Country Status (3)
Country | Link |
---|---|
US (1) | US3923063A (en) |
JP (2) | JPS5136791A (en) |
AU (1) | AU8297375A (en) |
Cited By (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4102341A (en) * | 1975-12-20 | 1978-07-25 | Olympus Optical Co., Ltd. | Electric knife device |
US4116238A (en) * | 1976-08-18 | 1978-09-26 | Midgard Electronics Company, Inc. | High voltage constant current source for iontophoresis |
US4126137A (en) * | 1977-01-21 | 1978-11-21 | Minnesota Mining And Manufacturing Company | Electrosurgical unit |
FR2409487A1 (en) * | 1977-11-17 | 1979-06-15 | Valleylab Inc | APPARATUS AND METHOD FOR MEASURING THE SURFACE OF CONTACT WITH TISSUES OF AN ELECTRODE FOR ELECTROSURGERY AND CRYOSURGERY |
US4188927A (en) * | 1978-01-12 | 1980-02-19 | Valleylab, Inc. | Multiple source electrosurgical generator |
US4210152A (en) * | 1978-05-01 | 1980-07-01 | International Medical Electronics Ltd. | Method and apparatus for measuring and controlling the output power of a shortwave therapy apparatus |
US4271837A (en) * | 1978-01-17 | 1981-06-09 | Aesculap-Werke Aktiengesellschaft Vormals Jetter & Scheerer | Electrosurgical apparatus |
US4303073A (en) * | 1980-01-17 | 1981-12-01 | Medical Plastics, Inc. | Electrosurgery safety monitor |
EP0056235A2 (en) * | 1981-01-14 | 1982-07-21 | Olympus Optical Co., Ltd. | Endoscopic photographing apparatus |
US4345599A (en) * | 1980-03-20 | 1982-08-24 | Mccarrell Stuart G | Tonsil snare |
US4459993A (en) * | 1982-08-20 | 1984-07-17 | Camino Laboratories | Continuity detector for heartbeat rate measuring system |
US4494541A (en) * | 1980-01-17 | 1985-01-22 | Medical Plastics, Inc. | Electrosurgery safety monitor |
US4574801A (en) * | 1984-02-29 | 1986-03-11 | Aspen Laboratories, Inc. | Electrosurgical unit with regulated output |
US4662369A (en) * | 1986-04-04 | 1987-05-05 | Castle Company | Electrosurgical apparatus having a safety circuit |
DE3942998A1 (en) * | 1989-12-27 | 1991-07-04 | Delma Elektro Med App | Electro-surgical HF instrument for contact coagulation - has monitoring circuit evaluating HF voltage at electrodes and delivering switch=off signal |
GB2259453A (en) * | 1991-09-14 | 1993-03-17 | Smiths Industries Plc | Electrosurgery equipment |
WO1996014021A1 (en) * | 1994-10-28 | 1996-05-17 | Chiron Vision Corporation | Bipolar electrosurgical apparatus |
EP0754437A2 (en) † | 1995-06-23 | 1997-01-22 | Gyrus Medical Limited | An electrosurgical generator and system |
US5944715A (en) * | 1996-06-20 | 1999-08-31 | Gyrus Medical Limited | Electrosurgical instrument |
US6004319A (en) * | 1995-06-23 | 1999-12-21 | Gyrus Medical Limited | Electrosurgical instrument |
US6013076A (en) * | 1996-01-09 | 2000-01-11 | Gyrus Medical Limited | Electrosurgical instrument |
US6015406A (en) * | 1996-01-09 | 2000-01-18 | Gyrus Medical Limited | Electrosurgical instrument |
US6027501A (en) * | 1995-06-23 | 2000-02-22 | Gyrus Medical Limited | Electrosurgical instrument |
US6090106A (en) * | 1996-01-09 | 2000-07-18 | Gyrus Medical Limited | Electrosurgical instrument |
US6093186A (en) * | 1996-12-20 | 2000-07-25 | Gyrus Medical Limited | Electrosurgical generator and system |
US6210405B1 (en) | 1996-06-20 | 2001-04-03 | Gyrus Medical Limited | Under water treatment |
US6277114B1 (en) | 1998-04-03 | 2001-08-21 | Gyrus Medical Limited | Electrode assembly for an electrosurical instrument |
US6565561B1 (en) | 1996-06-20 | 2003-05-20 | Cyrus Medical Limited | Electrosurgical instrument |
US6780180B1 (en) | 1995-06-23 | 2004-08-24 | Gyrus Medical Limited | Electrosurgical instrument |
US7044948B2 (en) | 2002-12-10 | 2006-05-16 | Sherwood Services Ag | Circuit for controlling arc energy from an electrosurgical generator |
US7131860B2 (en) | 2003-11-20 | 2006-11-07 | Sherwood Services Ag | Connector systems for electrosurgical generator |
US7137980B2 (en) | 1998-10-23 | 2006-11-21 | Sherwood Services Ag | Method and system for controlling output of RF medical generator |
US7255694B2 (en) | 2002-12-10 | 2007-08-14 | Sherwood Services Ag | Variable output crest factor electrosurgical generator |
US7300435B2 (en) | 2003-11-21 | 2007-11-27 | Sherwood Services Ag | Automatic control system for an electrosurgical generator |
US7303557B2 (en) | 1998-10-23 | 2007-12-04 | Sherwood Services Ag | Vessel sealing system |
US7364577B2 (en) | 2002-02-11 | 2008-04-29 | Sherwood Services Ag | Vessel sealing system |
USRE40388E1 (en) | 1997-04-09 | 2008-06-17 | Covidien Ag | Electrosurgical generator with adaptive power control |
US7396336B2 (en) | 2003-10-30 | 2008-07-08 | Sherwood Services Ag | Switched resonant ultrasonic power amplifier system |
US7473145B2 (en) | 2001-06-01 | 2009-01-06 | Covidien Ag | Return pad cable connector |
US7513896B2 (en) | 2006-01-24 | 2009-04-07 | Covidien Ag | Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling |
US20090198229A1 (en) * | 2008-02-05 | 2009-08-06 | Tyco Healthcare Group Lp | Hybrid Contact Quality Monitoring Return Electrode |
US7628786B2 (en) | 2004-10-13 | 2009-12-08 | Covidien Ag | Universal foot switch contact port |
US7637907B2 (en) | 2006-09-19 | 2009-12-29 | Covidien Ag | System and method for return electrode monitoring |
US7648499B2 (en) | 2006-03-21 | 2010-01-19 | Covidien Ag | System and method for generating radio frequency energy |
US7651492B2 (en) | 2006-04-24 | 2010-01-26 | Covidien Ag | Arc based adaptive control system for an electrosurgical unit |
US7651493B2 (en) | 2006-03-03 | 2010-01-26 | Covidien Ag | System and method for controlling electrosurgical snares |
US7722603B2 (en) | 2006-09-28 | 2010-05-25 | Covidien Ag | Smart return electrode pad |
US7722601B2 (en) | 2003-05-01 | 2010-05-25 | Covidien Ag | Method and system for programming and controlling an electrosurgical generator system |
US7731717B2 (en) | 2006-08-08 | 2010-06-08 | Covidien Ag | System and method for controlling RF output during tissue sealing |
US7736359B2 (en) | 2006-01-12 | 2010-06-15 | Covidien Ag | RF return pad current detection system |
US7749217B2 (en) | 2002-05-06 | 2010-07-06 | Covidien Ag | Method and system for optically detecting blood and controlling a generator during electrosurgery |
US7766905B2 (en) | 2004-02-12 | 2010-08-03 | Covidien Ag | Method and system for continuity testing of medical electrodes |
US7780662B2 (en) | 2004-03-02 | 2010-08-24 | Covidien Ag | Vessel sealing system using capacitive RF dielectric heating |
US7794457B2 (en) * | 2006-09-28 | 2010-09-14 | Covidien Ag | Transformer for RF voltage sensing |
US20100241023A1 (en) * | 2009-03-19 | 2010-09-23 | Tyco Healthcare Group Lp | System and Method for Return Electrode Monitoring |
US20100241116A1 (en) * | 2009-03-17 | 2010-09-23 | Benamou Steffan A | Method and system for adjusting source impedance and maximizing output by RF generator |
US20100256635A1 (en) * | 2009-04-07 | 2010-10-07 | Tyco Healthcare Group Lp | Vessel Sealer and Divider with Blade Deployment Alarm |
US7834484B2 (en) | 2007-07-16 | 2010-11-16 | Tyco Healthcare Group Lp | Connection cable and method for activating a voltage-controlled generator |
US7901400B2 (en) | 1998-10-23 | 2011-03-08 | Covidien Ag | Method and system for controlling output of RF medical generator |
US20110071520A1 (en) * | 2009-09-23 | 2011-03-24 | Tyco Healthcare Group Lp | Methods and Apparatus for Smart Handset Design in Surgical Instruments |
US7927328B2 (en) | 2006-01-24 | 2011-04-19 | Covidien Ag | System and method for closed loop monitoring of monopolar electrosurgical apparatus |
US7927329B2 (en) | 2006-09-28 | 2011-04-19 | Covidien Ag | Temperature sensing return electrode pad |
US7938825B2 (en) | 2002-09-25 | 2011-05-10 | Covidien Ag | Multiple RF return pad contact detection system |
US7947039B2 (en) | 2005-12-12 | 2011-05-24 | Covidien Ag | Laparoscopic apparatus for performing electrosurgical procedures |
US7972328B2 (en) | 2006-01-24 | 2011-07-05 | Covidien Ag | System and method for tissue sealing |
US8021360B2 (en) | 2007-04-03 | 2011-09-20 | Tyco Healthcare Group Lp | System and method for providing even heat distribution and cooling return pads |
US8034049B2 (en) | 2006-08-08 | 2011-10-11 | Covidien Ag | System and method for measuring initial tissue impedance |
US8080007B2 (en) | 2007-05-07 | 2011-12-20 | Tyco Healthcare Group Lp | Capacitive electrosurgical return pad with contact quality monitoring |
US8100898B2 (en) | 2007-08-01 | 2012-01-24 | Tyco Healthcare Group Lp | System and method for return electrode monitoring |
US8104956B2 (en) | 2003-10-23 | 2012-01-31 | Covidien Ag | Thermocouple measurement circuit |
US8147485B2 (en) | 2006-01-24 | 2012-04-03 | Covidien Ag | System and method for tissue sealing |
US8216223B2 (en) | 2006-01-24 | 2012-07-10 | Covidien Ag | System and method for tissue sealing |
US8216220B2 (en) | 2007-09-07 | 2012-07-10 | Tyco Healthcare Group Lp | System and method for transmission of combined data stream |
US8226639B2 (en) | 2008-06-10 | 2012-07-24 | Tyco Healthcare Group Lp | System and method for output control of electrosurgical generator |
US8231614B2 (en) | 2007-05-11 | 2012-07-31 | Tyco Healthcare Group Lp | Temperature monitoring return electrode |
US8388612B2 (en) | 2007-05-11 | 2013-03-05 | Covidien Lp | Temperature monitoring return electrode |
US8486061B2 (en) | 2009-01-12 | 2013-07-16 | Covidien Lp | Imaginary impedance process monitoring and intelligent shut-off |
US20130211398A1 (en) * | 2000-12-28 | 2013-08-15 | Senorx, Inc. | Electrosurgical medical system and method |
US8512332B2 (en) | 2007-09-21 | 2013-08-20 | Covidien Lp | Real-time arc control in electrosurgical generators |
US8636730B2 (en) | 2010-07-12 | 2014-01-28 | Covidien Lp | Polarity control of electrosurgical generator |
US8652125B2 (en) | 2009-09-28 | 2014-02-18 | Covidien Lp | Electrosurgical generator user interface |
US8663214B2 (en) | 2006-01-24 | 2014-03-04 | Covidien Ag | Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm |
US8685016B2 (en) | 2006-01-24 | 2014-04-01 | Covidien Ag | System and method for tissue sealing |
US8734438B2 (en) | 2005-10-21 | 2014-05-27 | Covidien Ag | Circuit and method for reducing stored energy in an electrosurgical generator |
US8753334B2 (en) | 2006-05-10 | 2014-06-17 | Covidien Ag | System and method for reducing leakage current in an electrosurgical generator |
US8777941B2 (en) | 2007-05-10 | 2014-07-15 | Covidien Lp | Adjustable impedance electrosurgical electrodes |
US8777940B2 (en) | 2007-04-03 | 2014-07-15 | Covidien Lp | System and method for providing even heat distribution and cooling return pads |
US8801703B2 (en) | 2007-08-01 | 2014-08-12 | Covidien Lp | System and method for return electrode monitoring |
US8808161B2 (en) | 2003-10-23 | 2014-08-19 | Covidien Ag | Redundant temperature monitoring in electrosurgical systems for safety mitigation |
CN103989519A (en) * | 2013-02-19 | 2014-08-20 | 柯惠有限合伙公司 | Electrosurgical generator and system |
US8821487B2 (en) | 2005-03-31 | 2014-09-02 | Covidien Ag | Temperature regulating patient return electrode and return electrode monitoring system |
US9186200B2 (en) | 2006-01-24 | 2015-11-17 | Covidien Ag | System and method for tissue sealing |
US9265560B2 (en) | 2011-02-25 | 2016-02-23 | Covidien Lp | System and method for detecting and suppressing arc formation during an electrosurgical procedure |
US9474564B2 (en) | 2005-03-31 | 2016-10-25 | Covidien Ag | Method and system for compensating for external impedance of an energy carrying component when controlling an electrosurgical generator |
US9636165B2 (en) | 2013-07-29 | 2017-05-02 | Covidien Lp | Systems and methods for measuring tissue impedance through an electrosurgical cable |
US9750558B2 (en) | 2000-12-28 | 2017-09-05 | Senorx, Inc. | Electrosurgical medical system and method |
US9872719B2 (en) | 2013-07-24 | 2018-01-23 | Covidien Lp | Systems and methods for generating electrosurgical energy using a multistage power converter |
US10912541B2 (en) | 2003-06-03 | 2021-02-09 | Senorx, Inc. | Universal medical device control console |
US11364076B2 (en) | 2019-12-12 | 2022-06-21 | Covidien Lp | Monopolar return pad |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4394408A (en) * | 1982-03-08 | 1983-07-19 | The Continental Group, Inc. | Apparatus and method for applying adhesive to a container edge portion |
US4727874A (en) * | 1984-09-10 | 1988-03-01 | C. R. Bard, Inc. | Electrosurgical generator with high-frequency pulse width modulated feedback power control |
JPS62266050A (en) * | 1986-05-14 | 1987-11-18 | オリンパス光学工業株式会社 | High frequency electric knife apparatus |
JPH0753256B2 (en) * | 1989-02-23 | 1995-06-07 | 住友金属鉱山株式会社 | Coating equipment for cylindrical bodies such as engine pistons |
JPH0349130A (en) * | 1989-07-18 | 1991-03-01 | Matsushita Electron Corp | Formation of scatter preventing film |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3315678A (en) * | 1964-07-17 | 1967-04-25 | Epilatron Inc | Epilating machine and control circuit |
US3601126A (en) * | 1969-01-08 | 1971-08-24 | Electro Medical Systems Inc | High frequency electrosurgical apparatus |
US3675655A (en) * | 1970-02-04 | 1972-07-11 | Electro Medical Systems Inc | Method and apparatus for high frequency electric surgery |
US3812858A (en) * | 1972-10-24 | 1974-05-28 | Sybron Corp | Dental electrosurgical unit |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1005123A (en) * | 1972-03-29 | 1977-02-08 | Weldon R. Sittner | Method and apparatus for high frequency electric surgery |
JPS4959489A (en) * | 1972-10-06 | 1974-06-10 |
-
1974
- 1974-07-15 US US488281A patent/US3923063A/en not_active Expired - Lifetime
-
1975
- 1975-07-11 AU AU82973/75A patent/AU8297375A/en not_active Expired
- 1975-07-15 JP JP50085919A patent/JPS5136791A/ja active Pending
- 1975-10-03 JP JP50119041A patent/JPS5211683A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3315678A (en) * | 1964-07-17 | 1967-04-25 | Epilatron Inc | Epilating machine and control circuit |
US3601126A (en) * | 1969-01-08 | 1971-08-24 | Electro Medical Systems Inc | High frequency electrosurgical apparatus |
US3675655A (en) * | 1970-02-04 | 1972-07-11 | Electro Medical Systems Inc | Method and apparatus for high frequency electric surgery |
US3812858A (en) * | 1972-10-24 | 1974-05-28 | Sybron Corp | Dental electrosurgical unit |
Cited By (177)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4102341A (en) * | 1975-12-20 | 1978-07-25 | Olympus Optical Co., Ltd. | Electric knife device |
US4116238A (en) * | 1976-08-18 | 1978-09-26 | Midgard Electronics Company, Inc. | High voltage constant current source for iontophoresis |
US4126137A (en) * | 1977-01-21 | 1978-11-21 | Minnesota Mining And Manufacturing Company | Electrosurgical unit |
FR2409487A1 (en) * | 1977-11-17 | 1979-06-15 | Valleylab Inc | APPARATUS AND METHOD FOR MEASURING THE SURFACE OF CONTACT WITH TISSUES OF AN ELECTRODE FOR ELECTROSURGERY AND CRYOSURGERY |
US4200104A (en) * | 1977-11-17 | 1980-04-29 | Valleylab, Inc. | Contact area measurement apparatus for use in electrosurgery |
US4188927A (en) * | 1978-01-12 | 1980-02-19 | Valleylab, Inc. | Multiple source electrosurgical generator |
US4271837A (en) * | 1978-01-17 | 1981-06-09 | Aesculap-Werke Aktiengesellschaft Vormals Jetter & Scheerer | Electrosurgical apparatus |
US4210152A (en) * | 1978-05-01 | 1980-07-01 | International Medical Electronics Ltd. | Method and apparatus for measuring and controlling the output power of a shortwave therapy apparatus |
US4303073A (en) * | 1980-01-17 | 1981-12-01 | Medical Plastics, Inc. | Electrosurgery safety monitor |
US4494541A (en) * | 1980-01-17 | 1985-01-22 | Medical Plastics, Inc. | Electrosurgery safety monitor |
US4345599A (en) * | 1980-03-20 | 1982-08-24 | Mccarrell Stuart G | Tonsil snare |
EP0056235A2 (en) * | 1981-01-14 | 1982-07-21 | Olympus Optical Co., Ltd. | Endoscopic photographing apparatus |
EP0056235A3 (en) * | 1981-01-14 | 1982-09-29 | Olympus Optical Co., Ltd. | Endoscopic photographing apparatus |
US4487489A (en) * | 1981-01-14 | 1984-12-11 | Olympus Optical Co., Ltd. | Endoscopic photographing apparatus |
US4459993A (en) * | 1982-08-20 | 1984-07-17 | Camino Laboratories | Continuity detector for heartbeat rate measuring system |
US4574801A (en) * | 1984-02-29 | 1986-03-11 | Aspen Laboratories, Inc. | Electrosurgical unit with regulated output |
US4662369A (en) * | 1986-04-04 | 1987-05-05 | Castle Company | Electrosurgical apparatus having a safety circuit |
DE3942998A1 (en) * | 1989-12-27 | 1991-07-04 | Delma Elektro Med App | Electro-surgical HF instrument for contact coagulation - has monitoring circuit evaluating HF voltage at electrodes and delivering switch=off signal |
DE3942998C2 (en) * | 1989-12-27 | 1998-11-26 | Delma Elektro Med App | High frequency electrosurgical unit |
GB2259453A (en) * | 1991-09-14 | 1993-03-17 | Smiths Industries Plc | Electrosurgery equipment |
EP0533360A1 (en) * | 1991-09-14 | 1993-03-24 | Smiths Industries Public Limited Company | Electrosurgery apparatus |
GB2259453B (en) * | 1991-09-14 | 1995-07-12 | Smiths Industries Plc | Electrosurgery equipment |
US5246439A (en) * | 1991-09-14 | 1993-09-21 | Smiths Industries Public Limited Company | Electrosurgery equipment |
WO1996014021A1 (en) * | 1994-10-28 | 1996-05-17 | Chiron Vision Corporation | Bipolar electrosurgical apparatus |
US6780180B1 (en) | 1995-06-23 | 2004-08-24 | Gyrus Medical Limited | Electrosurgical instrument |
US6261286B1 (en) | 1995-06-23 | 2001-07-17 | Gyrus Medical Limited | Electrosurgical generator and system |
US6004319A (en) * | 1995-06-23 | 1999-12-21 | Gyrus Medical Limited | Electrosurgical instrument |
EP0754437B2 (en) † | 1995-06-23 | 2004-12-22 | Gyrus Medical Limited | An electrosurgical generator and system |
EP0754437A2 (en) † | 1995-06-23 | 1997-01-22 | Gyrus Medical Limited | An electrosurgical generator and system |
US6027501A (en) * | 1995-06-23 | 2000-02-22 | Gyrus Medical Limited | Electrosurgical instrument |
US6056746A (en) * | 1995-06-23 | 2000-05-02 | Gyrus Medical Limited | Electrosurgical instrument |
US6416509B1 (en) | 1995-06-23 | 2002-07-09 | Gyrus Medical Limited | Electrosurgical generator and system |
US6364877B1 (en) | 1995-06-23 | 2002-04-02 | Gyrus Medical Limited | Electrosurgical generator and system |
US6174308B1 (en) | 1995-06-23 | 2001-01-16 | Gyrus Medical Limited | Electrosurgical instrument |
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Also Published As
Publication number | Publication date |
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AU8297375A (en) | 1977-01-13 |
JPS5136791A (en) | 1976-03-27 |
JPS5211683A (en) | 1977-01-28 |
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