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

Patents

  1. Advanced Patent Search
Publication numberUS2827056 A
Publication typeGrant
Publication dateMar 18, 1958
Filing dateJun 21, 1955
Priority dateJun 21, 1955
Publication numberUS 2827056 A, US 2827056A, US-A-2827056, US2827056 A, US2827056A
InventorsJohn Degelman
Original AssigneeJohn H Drew, Thomas H Ballantine Jr
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrode discharge control for surgical apparatus
US 2827056 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

Marchl8f1'958 J. DEGELMAN 2,827,056

ELECTRODE DISCHARGE CONTROL FOR SURGICAL APPARATUS Filed June 21, 1955 a {Zoe/wwe/& m e We)! dug];

United States PatentO ELECTRODE DISCHARGE CONTROL FOR SURGICAL APPARATUS John Degelman; HarvanL Massi, assignorof one-half to Thomas-H; Ballantine, Jix, Dedham, and one-half: to John H. Drew, Framingham, Mass.

ApplicationJune 21,1955; SerialjNo. 516,927

Claims. ((31.128-422) This inventionrelates to apparatus for controllingthe discharge'of current from -an electrode into abody which is moreor less conductive. More particularly the-invention relates to apparatus fordischarging highfrequency current to a wound in ahuman' bodyfor the purpose'of cauterizing the wound Heretofore the flow ofcurrent to such an electrode has been controlled by a manual switch on the electrode itself or a foot switch-controlled'by-the operator. Neither controlhas been satisfactory because they both interfere with the work of the operator which is often of a delicate nature as, for example,- inthe case of a surgeon cauterizing a wound; Moreover a switch on the electrode often interferes with the facile operation of the electrode;

Objects of the present invention are-to provide a control which eliminates all manual controls,- which automatically supplies discharge current when: the electrode is' presented to-the body, andwhich requires only a single conductor leading to the'electrode.

According to the present invention the apparatus comprises a work circuit for supplying alternating current to the body when the electrode is presented tothe body, and a control circuit including a source of direct current and control means responsive to the aforesaid sourcefor initiating flow of alternating current to the work circuit when the control circuit is closed, the aforesaid circuits having a common portion including saidbody and electrode, whereby the control circuit is closed by touching the body with the electrode.

In a more specific aspect the apparatus comprises an electronic device having a control electrode which puts the device in non-conducting condition at one potential and in conducting condition at another potential, and a control circuit including the aforesaid body and electrodes for changing the potential of the control electrode from the first to the second of the aforesaid potentials when the discharge electrode is presented to the body, whereby current in the work circuit is initiated when the discharge electrode is presented to the body. Preferably the electronic device comprises a triode or transistor having direct current bias means for normally holding the control electrode at a potential to maintain the device in non-conductive condition. The control circuit should be connected to the work circuit at a point between the source of alternating current and the discharge electrode so that the electrode requires only one conductor. Also the apparatus should have an inductor in the control circuit between the two electrodes and a condenser in the work circuit between the source of alternating current and a point at which the control circuit is connected to the work circuit. Preferably the electronic device is of the type having an output circuit for controlling the supply of current to the work circuit and an input circuit including the aforesaid body and electrode for changing the potential from inoperative to operative when the discharge electrode is presented to the body.

For the purpose of illustration a typical embodiment 2,827,056 Patented Mar. 18 1958 2 of the 'invention is shown-in the accompanying drawings inwhichzthe figure is alcircuitdiagram.

The-particular embodiment illustrated in the drawing comprisesaworkcircuit 12:supplied from any suitable source of alternating current and containing a switch 3; acondenser 4,1 the aforesaid discharge electrode 6 and a support- Tfor theaforesaid body to which the. electrode 6:is tobe presented. While'thessupport 7 may be connectedadirectly to therside 2 of the .work circuit, as illus trated't both the conductor. 2; and the support 7 are grounded; The=switch3 is closed by means of a relay-8 connectedstotthe, plate 9 ofi-a triode 10 comprising acathode 11' and; a grid-: 12,. the..cathode being connected to the; side-2., of; the work circuit. The. grid 12 isbiased by:means-.,-of-a directscurrent source C througha cone ductor 13 and,-two' resistors-1,4 and. 16. Connected acrossithe workcircuit isa. bridge circuit-17 containing induetance 18-, and. capacitance 19,- the conductor 17 being connec ted to 13 intermediate the. inductance. and capacitance. The capacitance 4v prevents the. flow. of direct-current; back tothe source of, alternating current and the-,inductance;1 8- blocks the flow of alternatingcurrent through the control circuit, A high resistance 15 may also, beincluded in conductor 13- asillustrated.

For cauterizing wounds the discharge current may have a. frequency'of: the, order of; one megacycle or more and a'potential-of the order of one thousand volts, in which casethe value-of the resistors, 14 and 16 maybe of the QIder of ten; million ohms. each. The value of C.. should be approximately twicethe voltage required to effectively cut off the flow of plate current in the triode, fo r examplefortyvolts.

Normally no substantial amount ofcurrent flows through the triode becauseof the bias produced by the sourceC However,- when the electrode dis grounded, by contact withv a conducting body resting on the. grounded support 7, the potential drop between plate 9, and cathode 11. is greatly reduced. This results in the energization of relay 8 which closes the switch 3, thereby automatically supplying alternating. current to the electrode 6. v V i From the foregoing itwill be evident that the present invention eliminates manual switches and initiates the flow of discharge current automatically the moment the discharge electrode touches. the patient or other grounded body which is more. or less conducting. It will also be evident that the apparatus requires only a single conductor leading to the discharge electrode, thereby facilitating the use of the electrode. When the body being operated on is a human bodyit may be grounded merely by resting on the grounded support 7 However, in this case the body is preferably rested on a more comfortable support and grounded by means of one or more electrodes held against the body by suitable means.

When operating on a human body, particularly in th region of the brain, it is important not to impart a stimulus, and this is accomplished with the present invention by employing high frequency current in the work circuit and, in'the control circuit, low potential and high resistance so that there is no substantial direct current flow through the body.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

I claim:

1. For discharging current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying current to the electrode, and means for controlling the supply of current to the work circuit, said means comprising an electronic device having a cont ol e ectrod which p the ev e in n-c nduc ing condition at one potential and in conducting condition at another potential and a control circuit including said body and electrodes for changing the potential of said control electrode from the first to the second of said potentials when the discharge electrode is presented to the body, whereby current in the work circuit is initiated when the discharge electrode is presented 'to the body.

2. For discharging current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying current to the electrode, and means for controlling the supply of current to the work circuit, said means comprising an electronic device havmg a control electrode, bias means normally holding the control electrode at a potential to hold said device nonconductive and a control circuit including said body and electrodes for altering the potential of said control electrode when the discharge electrode is presented to the body thereby to cause said device to conduct.

3. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, and means for controlling the supply of current to the work circuit, said means comprising an electronic device having a control electrode which puts the valve in non-conducting condition at one potential and in conducting condition at another potential, direct current bias means normally holding the control electrode at said first potential, and a control circuit including said body and electrodes for changing the potential of said control electrode from the first to the second of said potentials when the discharge electrode is presented to the body, and an inductor in the control circuit between said electrodes.

4. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, and means for controlling the supply of current to the work circuit, said means comprising an electronic device having a control electrode which puts the valve in non-conducting condition at one potential and in conducting condition at another potential, direct current bias means normally holding the control electrode at said first potential, and a control circuit including said body and electrodes for changing the potential of said control electrode from the first to the second of said potentials when the discharge electrode is presented to the body, the control circuit being connected to the work circuit at a point between the source of alternating current and the discharge electrode so that the electrode requires only one conductor, and a condenser in the work circuit between the source of alternating current and said point. 7

5. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, and means for controlling the supply of current to the work circuit, said means comprising an electronic device having a control electrode which puts the device in non-conducting condition at one potential and in conducting condition at another potential, direct current bias means normally holding the control electrode at said first potential, and a control circuit including said body and electrodes for changing the potential of said control electrode from the first to the second of said potentials when the discharge electrode is presented to the body, the control current being connected to the work circuit at a point between the source of alternating current and the discharge electrode so that the electrode requires only one conductor, and an inductor in the control circuit between said electrodes.

6. For discharging current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying current to the electrode, an electronic device having an output circuit for controlling the supply of current to said work circuit and a control electrode having an inoperative potential at which the potential across the output circuit prevents supply of current to the work circuit and an operative potential at which the potential across the output circuit supplies current to the work circuit, and an input circuit including said body and electrodes for changing said inoperative potential to operative potential when the discharge electrode is presented to the body, whereby current in the supply circuit is initiated when the discharge electrode is presented to the body.

7. For discharging current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying current to the electrode, an electronic device having an output circuit for controlling the supply of current to said work circuit and a control electrode having an inoperative potential at which the potential across the output circuit prevents supply of current to the work circuit and an operative potential at which the potential across the output circuit supplies current to the Work circuit, bias means for supplying said potentials, and an input circuit including said body and electrodes for changing said inoperative potential to operative potential when the discharge electrode is presented to the body, whereby current in the supply circuit is initiated when the discharge electrode is presented to the body. a

8. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, an electronic device having an output circuit for controlling the supply of current to said'work circuit and a control electrode having an inoperative potential at which the potential across the output circuit prevents supply of current to the work circuit and an operative potential at which the potential across the output circuit supplies current to the work circuit, direct current bias means for supplying said potentials, and an input circuit including said body and electrodes for changing said inoperative potential to operative potential when the dis charge electrode is presented to the body, and an inductor input circuit between said electrodes.

9. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, an electronic device having an output circuit for controlling the supply of current to said work circuit and a control electrode having an inoperative potential at which the potential across the output circuit prevents supply of current to the work circuit and an operative potential at which the potential across the output circuit supplies current to the work circuit, direct current bias means for supplying said potentials, and an input circuit including said body and electrodes for changing said in operative potential to operative potential when the discharge electrode is presented to the body, the output current being connected to the working circuit at a point between the source of alternating current and the discharge electrode so that the electrode requires only one conductor, and a condenser in the working circuit between the source of alternating current and said point.

10. For discharging alternating current into a human body from a discharge electrode, surgical apparatus comprising a work circuit for supplying the current to the electrode, an electronic device having an output circuit for controlling the supply of current to said work circuit and a control electrode having an inoperative potential V at which the potential across the output circuit prevents supply of current to the work circuit and an operative potential at which the potential across the outputcircuit supplies current to the work circuit, direct current bias means for supplying said potentials, and an input circuit including said body and electrodes for changing said inoperative potential to operative potential when the discharge electrode is presented to the body, the control References Cited in the file of this patent current being connected to the supply circuit at a point UNITED STATES PATENTS between the source of alternating current and the electrode so that the electrode requires only one conductor, 2,251,277 Hart et Aug 51 1941 and an inductor in the control circuit between said 5 2293851 Rogers 1942 dectrodes. 2,379,837 Stahrner July 3, 1945 2,443,232 Fagen June 15, 1948 2,526,597 Winslow Oct. 17, 1950

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2251277 *Jan 24, 1939Aug 5, 1941United Shoe Machinery CorpControl apparatus for electrostatic drying
US2293851 *Mar 3, 1941Aug 25, 1942United Shoe Machinery CorpDiscontinuing treatment in electrostatic fields
US2379837 *Sep 11, 1944Jul 3, 1945Bernhardt StahmerControl system
US2443232 *Nov 15, 1943Jun 15, 1948Stewart Warner CorpElectric fence
US2526597 *Aug 10, 1945Oct 17, 1950Howard Winslow PaulCurrent control system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3110925 *Sep 12, 1961Nov 19, 1963Cincinnati Butchers Supply CoElectric stunner for livestock
US3122776 *Jun 30, 1960Mar 3, 1964Root John JAnimal stunner
US3315678 *Jul 17, 1964Apr 25, 1967Epilatron IncEpilating machine and control circuit
US3359982 *Feb 8, 1965Dec 26, 1967Guiorguiev MethodiSensing control for a surgical needle or instrument
US3642008 *Oct 15, 1969Feb 15, 1972Medical Plastics IncGround electrode and test circuit
US4414979 *Feb 23, 1981Nov 15, 1983Telectronics Pty. Ltd.Monitorable bone growth stimulator
US5496312 *Oct 7, 1993Mar 5, 1996Valleylab Inc.Impedance and temperature generator control
US5514129 *Dec 3, 1993May 7, 1996Valleylab Inc.Automatic bipolar control for an electrosurgical generator
US6210403Oct 7, 1993Apr 3, 2001Sherwood Services AgAutomatic control for energy from an electrosurgical generator
US6402747Feb 13, 2001Jun 11, 2002Sherwood Services AgHandswitch cord and circuit
US7044948Dec 4, 2003May 16, 2006Sherwood Services AgCircuit for controlling arc energy from an electrosurgical generator
US7131860Nov 20, 2003Nov 7, 2006Sherwood Services AgConnector systems for electrosurgical generator
US7137980May 1, 2003Nov 21, 2006Sherwood Services AgMethod and system for controlling output of RF medical generator
US7255694Dec 4, 2003Aug 14, 2007Sherwood Services AgVariable output crest factor electrosurgical generator
US7300435Nov 21, 2003Nov 27, 2007Sherwood Services AgAutomatic control system for an electrosurgical generator
US7303557Dec 27, 2004Dec 4, 2007Sherwood Services AgVessel sealing system
US7364577Jul 24, 2003Apr 29, 2008Sherwood Services AgVessel sealing system
US7396336Oct 27, 2004Jul 8, 2008Sherwood Services AgSwitched resonant ultrasonic power amplifier system
US7416437Aug 23, 2006Aug 26, 2008Sherwood Services AgConnector systems for electrosurgical generator
US7513896Jan 24, 2006Apr 7, 2009Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US7628786May 16, 2005Dec 8, 2009Covidien AgUniversal foot switch contact port
US7637907Sep 19, 2006Dec 29, 2009Covidien AgSystem and method for return electrode monitoring
US7648499Mar 21, 2006Jan 19, 2010Covidien AgSystem and method for generating radio frequency energy
US7651492Apr 24, 2006Jan 26, 2010Covidien AgArc based adaptive control system for an electrosurgical unit
US7651493Mar 3, 2006Jan 26, 2010Covidien AgSystem and method for controlling electrosurgical snares
US7722601Apr 30, 2004May 25, 2010Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US7731717Aug 8, 2006Jun 8, 2010Covidien AgSystem and method for controlling RF output during tissue sealing
US7749217May 6, 2003Jul 6, 2010Covidien AgMethod and system for optically detecting blood and controlling a generator during electrosurgery
US7766693Jun 16, 2008Aug 3, 2010Covidien AgConnector systems for electrosurgical generator
US7766905Feb 4, 2005Aug 3, 2010Covidien AgMethod and system for continuity testing of medical electrodes
US7780662Feb 23, 2005Aug 24, 2010Covidien AgVessel sealing system using capacitive RF dielectric heating
US7794457Sep 28, 2006Sep 14, 2010Covidien AgTransformer for RF voltage sensing
US7824400Mar 3, 2006Nov 2, 2010Covidien AgCircuit for controlling arc energy from an electrosurgical generator
US7834484Jul 16, 2007Nov 16, 2010Tyco Healthcare Group LpConnection cable and method for activating a voltage-controlled generator
US7901400Jan 27, 2005Mar 8, 2011Covidien AgMethod and system for controlling output of RF medical generator
US7927328Jan 24, 2007Apr 19, 2011Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US7947039Dec 12, 2005May 24, 2011Covidien AgLaparoscopic apparatus for performing electrosurgical procedures
US7972328Jan 24, 2007Jul 5, 2011Covidien AgSystem and method for tissue sealing
US7972332Dec 16, 2009Jul 5, 2011Covidien AgSystem and method for controlling electrosurgical snares
US8012150Apr 30, 2004Sep 6, 2011Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US8025660Nov 18, 2009Sep 27, 2011Covidien AgUniversal foot switch contact port
US8034049Aug 8, 2006Oct 11, 2011Covidien AgSystem and method for measuring initial tissue impedance
US8080008Sep 18, 2007Dec 20, 2011Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US8096961Jun 27, 2008Jan 17, 2012Covidien AgSwitched resonant ultrasonic power amplifier system
US8104956Oct 23, 2003Jan 31, 2012Covidien AgThermocouple measurement circuit
US8105323Oct 24, 2006Jan 31, 2012Covidien AgMethod and system for controlling output of RF medical generator
US8113057Jun 27, 2008Feb 14, 2012Covidien AgSwitched resonant ultrasonic power amplifier system
US8147485Feb 23, 2009Apr 3, 2012Covidien AgSystem and method for tissue sealing
US8187262Jun 3, 2009May 29, 2012Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US8202271Feb 25, 2009Jun 19, 2012Covidien AgDual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US8216220Sep 7, 2007Jul 10, 2012Tyco Healthcare Group LpSystem and method for transmission of combined data stream
US8216223Feb 23, 2009Jul 10, 2012Covidien AgSystem and method for tissue sealing
US8226639Jun 10, 2008Jul 24, 2012Tyco Healthcare Group LpSystem and method for output control of electrosurgical generator
US8231616Aug 23, 2010Jul 31, 2012Covidien AgTransformer for RF voltage sensing
US8241278Apr 29, 2011Aug 14, 2012Covidien AgLaparoscopic apparatus for performing electrosurgical procedures
US8267928Mar 29, 2011Sep 18, 2012Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US8267929Dec 16, 2011Sep 18, 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US8287528Mar 28, 2008Oct 16, 2012Covidien AgVessel sealing system
US8298223Apr 5, 2010Oct 30, 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US8303580Apr 5, 2010Nov 6, 2012Covidien AgMethod and system for programming and controlling an electrosurgical generator system
US8353905Jun 18, 2012Jan 15, 2013Covidien LpSystem and method for transmission of combined data stream
US8475447Aug 23, 2012Jul 2, 2013Covidien AgSystem and method for closed loop monitoring of monopolar electrosurgical apparatus
US8485993Jan 16, 2012Jul 16, 2013Covidien AgSwitched resonant ultrasonic power amplifier system
US8486061Aug 24, 2012Jul 16, 2013Covidien LpImaginary impedance process monitoring and intelligent shut-off
US8512332Sep 21, 2007Aug 20, 2013Covidien LpReal-time arc control in electrosurgical generators
US8523855Aug 23, 2010Sep 3, 2013Covidien AgCircuit for controlling arc energy from an electrosurgical generator
US8551088Apr 1, 2009Oct 8, 2013Applied Medical Resources CorporationElectrosurgical system
US8556890Dec 14, 2009Oct 15, 2013Covidien AgArc based adaptive control system for an electrosurgical unit
US8562598Apr 1, 2009Oct 22, 2013Applied Medical Resources CorporationElectrosurgical system
US8568411Mar 31, 2009Oct 29, 2013Applied Medical Resources CorporationElectrosurgical system
US8579894Apr 1, 2009Nov 12, 2013Applied Medical Resources CorporationElectrosurgical system
US8647340Jan 4, 2012Feb 11, 2014Covidien AgThermocouple measurement system
US8663214Jan 24, 2007Mar 4, 2014Covidien AgMethod and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US8685016Feb 23, 2009Apr 1, 2014Covidien AgSystem and method for tissue sealing
US8734438Oct 21, 2005May 27, 2014Covidien AgCircuit and method for reducing stored energy in an electrosurgical generator
US8753334May 10, 2006Jun 17, 2014Covidien AgSystem and method for reducing leakage current in an electrosurgical generator
USRE40388May 8, 2003Jun 17, 2008Covidien AgElectrosurgical generator with adaptive power control
DE1099658B *Apr 29, 1959Feb 16, 1961Siemens Reiniger Werke AgSelbsttaetige Einschaltvorrichtung fuer Hochfrequenzchirurgiegeraete
DE1139927B *Jan 3, 1961Nov 22, 1962Friedrich LaberHochfrequenz-Chirurgiegeraet
DE1146989B *Jul 10, 1959Apr 11, 1963Parisienne D Expl Des EtablissElektrochirurgisches Geraet fuer elektrische Schnitte und zur Elektrokoagulation
DE2540968A1 *Sep 13, 1975Mar 17, 1977Erbe ElektromedizinSchaltung fuer eine bipolare koagulationspinzette
Classifications
U.S. Classification606/4, 361/199, 307/125, 256/10
International ClassificationA61B18/12
Cooperative ClassificationA61B18/1206, A61B18/12, A61B2018/0066
European ClassificationA61B18/12G, A61B18/12