|Publication number||US3601126 A|
|Publication date||Aug 24, 1971|
|Filing date||Jan 8, 1969|
|Priority date||Jan 8, 1969|
|Publication number||US 3601126 A, US 3601126A, US-A-3601126, US3601126 A, US3601126A|
|Inventors||Estes Jerry R|
|Original Assignee||Electro Medical Systems Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (267), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent  Inventor Jerry R. Estes Boulder, Colo. 2: Appl. No. 789,716  Filed Jan. 8, 1969  Patented Aug. 24, 1971  Assignee Elects-o Medical Systems, Inc.
 HIGH FREQUENCY ELECTROSURGICAL APPARATUS 5 Claims, 6 Drawing Figs.
 US. Cl 128/301, 128/417  lnL Cl. A6111 17/36  Field of Search CUTTl N6 SWlTCH a ELECTRO SURGICA L  References Cited UNITED STATES PATENTS 3,478,744 11/1969 Leiter 123/303. 14
FOREIGN PATENTS 1,178,528 9/1964 Germany l28/303.l7 1,139,927 11/1962 Germany l28/303.l3
Primary ExaminerL W. Trapp Attomey Philip G. Hilbert ABSTRACT: Electrosurgical apparatus including electrodes powered by high frequency electric current, wherein the amplitude of the current flowing through the circuit is monitored and compared with a reference amplitude so that the current source can be regulated to transmit power of a desired amplitude. Further, the waveform of the current can be selectively switched from a sinusoidal waveform to a pulsed waveform. Also, there is provided an indifferent or return electrode whose conductivity controls the operation of the power source.
DEVICE g INDIFFERENT ELECTRODE COAGULATlNG SWITCH I 5a -ON/OFF l b I SWITCH 2 6 l T 668} l GAIN CONTROL AMF'LlFlER g9 SQUARE LAW DETECTOR DIFFERENCE AMPLIFIER g s HIGH FREQUENCY ELECTROSURGICAL APPARATUS BACKGROUND OF THE INVENTION This invention pertains to electrosurgical apparatus and more particularly, to such apparatus which is powered by high frequency current for cutting tissue, coagulating blood vessels and fulguration of growths.
Known electrosurgical apparatus generates a high frequency electric current which is fed to an active electrode. An indifferent electrode is placed in contact with the patient to supply a return path for the current. When the active electrode is applied to tissue of the patient at the operating site, a circuit is closed and the high frequency power emitted by the active electrode generates heat at the site. The resultant heat implements the desired operative procedure.
The amplitude of the current flowing between the electrodes is a function of the electrical resistance of the tissue current path between the electrodes. If the current generator is set to transmit a current of a given amplitude, such amplitude will be effectively related to a given load resistance. If the resistance decreases, the current amplitude increases; and vice versa.
During an operation, the impedance of the tissue changes as the active electrode moves through different types of tissue. Accordingly, a selected initial setting of the current generator at the start of an operation may not produce the desired current conditions as the operation proceeds.
It is a general object of this invention to provide electrosurgical apparatus wherein the power delivered to the active electrode as the same engages the tissue, is maintained at a constant desired level during the entire operational procedure.
Another object of this invention is to provide in apparatus of the character described, means for monitoring the am plitude of the power flow to the electrodes of the apparatus and controlling the output of the high frequency generator to maintain a desired or selected power amplitude.
Essentially, the electrosurgical apparatus of the instant invention comprises a pair of electrodes applicable to biological tissue; the electrodes being powered from a high frequency generator operative to controllably vary the power amplitude. The apparatus further includes reference means to establish a desired power amplitude in respect to the operating current passing through the biological tissue; together with means for sensing the amplitude of the power passing through the tissue and control means for comparing the amplitudes of the desired and actual power; the control means being responsive to such amplitude comparison to regulate the operation of the generator so that the generator will transmit power having an amplitude substantially equal to the desired power amplitude.
It is known in the art that different operative procedures require differing high frequency current waveforms. Thus, a cutting operation calls for a continuous wave or sinusoidal radio frequency oscillation of the current; whereas a coagulating procedure requires an oscillating current of the type pro vided by a spark gap oscillator. Such a spark gap oscillator generates a spectrum of frequencies between 0.5 mHz. and 1.5 ml-lz. This noise spectrum is distinguished by high voltage spikes with low average power values. Such a signal when impressed by way of the electrode on tissue, has a drying effeet which leads to a coagulating action in respect to such tissue, with very little tissue separation or cutting.
It is believed that any waveform which spreads the signal over a reasonable frequency spectrum, will produce the same effect.
Accordingly, the instant invention comprises a high frequency current generator which can be selectively controlled to operate in a continuous wave mode or a pulsed wave mode with the amplitudes of the signals being held at predetermined values.
In electrosurgical procedures the input current is applied to the tissue by way of an active electrode of very small cross section so as to obtain high current densities at the operation site.
These high current densities provide the desired heating effects. However the return or indifferent electrode must be in contact over a substantial area of the tissue so that the return current has a low density, which prevents burning or scarring of the tissue in contact with the indifferent electrode.
If for any reason, the indifferent electrode or its connection to the current source is broken or faulty, the low current density is not achieved and the tissue at the situs where the high frequency currents leave, will be burned or scarred.
With the apparatus of the instant invention, the conductive state of the indifferent electrode and its connection to the current generator is monitored and the generator made inoperative when the conductive state falls below a given value. I
In known electrosurgical apparatus, the indifferent electrode takes the form of a stainless steel plate which is placed under the patient and a conductive fluid is spread thereover to increase the contact area. Such an electrode must be sterilized before each use thereof and must be prewet with conductive fluid. This procedure may lead to omissions and inexact applications of fluid.
In the apparatus of the instant invention there is provided an inexpensive, prepackaged disposable indifferent electrode which is presterilized and prewet with conductive fluid. Such an electrode facilitates monitoring its conductive state and thus avoids tissue burns or scars.
Other objects of this invention will in part be obvious and in part hereinafter pointed out.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for electrosurgical apparatus embodying the invention;
FIG. 2 is a top plan view of the indifferent electrode, forming part of the apparatus;
FIG. 3 is a sectional view taken on the line 3-3 of FIG. 2;
FIG. 4 is an enlarged, partial sectional view of a portion of said electrode;
FIG. 5 is a top plan view showing a connector for the electrode of FIG. 2;
FIG. 6 is a sectional view taken on the line 645 of FIG. 5.
DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in the drawings, and particularly FIG. 1, electrosurgical apparatus embodying the invention is indicated at 10, for operative application to selected tissue portions of a patient indicated at 12. The apparatus 10 comprises a high frequency current generating system including an RF. oscillator 14 which drives a gain controlled power amplifier 16. The power amplifier 16 is coupled via step-up transformer 18 and coupling capacitors 20, 22 to active electrode 24 and an indifferent electrode 100, respectively.
During normal operation, when on/off switch 28 is in its closed position, the output of oscillator 14 is amplified by power amplifier 16 and transformer 18 to provide a alternating current which flows via capacitor 20 and active electrode 24 to the selected tissue area in contact therewith. The current passes through the body of patient 12 to the indifferent electrode where it is returned via lead 30 and capacitor 22 to transformer 18.
The power output in the form of the square of the amplitude of the alternating current must be set at a selected, desired level and maintained at such level for the desired operating procedure. Such desired levels are attained by adjusting one of the two calibrated power level setting potentiometers 32, 34. The operation of the respective potentiometers 32, 34 will be hereinafter described.
It is assumed that a voltage indicating the desired square law power amplitude level is present on lead 36 which feeds one input of difference amplifier 38. The other input of difference amplifier 38 is a voltage on lead 40 from square-law detector 42. The inputs of detector 42 are connected to a winding 44 of a magnetic core toroid 46 through which passes lead 30 connecting indifferent electrode 100 to capacitor 22. The combination of lead 30, toroid 46 and winding 44 provides in effect a transformer acting as a current sensor.
As the alternating current flows through lead 30, it will induce an alternating current in winding 44 which is detected in detector 42 to thereby generate a DC voltage having an amplitude proportional to the square of the AC current in lead 30. Difference amplifier 38 compares the DC voltage on line 40 with the DC voltage on line 36 and transmits a signal on line 48 to gain control amplifier 50 which amplifies the signal and transmits the same by lead 52 to a gain control terminal of power amplifier 16.
The relationship of the signals is such that if the amplitude of the current in lead 30 is greater than the desired amplitude as represented by the DC voltage on line 36, the signal on line 52 has a value to decrease the gain of amplifier 16. A similar effect occurs in the opposite direction when the actual current amplitude is less than the desired amplitude. Thus, amplifier 16 and the elements connected to its output comprise a servo system with the current sensor, square law detector, difference amplifier and gain control amplifier being the feedback loop; the signal on line 52 being the error signal and the signal on line 36 being the reference signal.
When the indicated surgical procedure involves a cutting operation, cutting switch 54 is closed to energize relay 56 which causes transfer contact 56A to connect potentiometer 32 to lead 36, and transfer contact 56B to connect with fixed contact 56C. In this case, oscillator 14 transmits a continuous wave of AC signal, as will be hereinafter described, and lead 36 transmits a DC voltage related to the desired amplitude of the alternating current for the cutting operation.
When a coagulating action is desired, switch 58 is closed, switch 54 being open, to energize relay 60 causing its transfer contact 60A to connect with fixed contact 608; transfer contact 56A of relay 56 now connects lead 36 to potentiometer 34. in this case, oscillator 14 emits packets of alternating current, as later described, and lead 36 transmits a DC voltage related to the desired amplitude of the alternating current for a coagulating operation.
The indifferent electrode 100 requires an electrolyte to pro vide good conductive contact with patient 12. When the quantity of electrolyte falls below a certain level, poor contact results and the patient may sufier from burns. Accordingly, the electrolyte is monitored as to quantity and the oscillator 14 is rendered inoperative when the quantity falls below a given value.
To this end, a series circuit is established between voltage source V, lead 62, a terminal 102 of electrode 100, the electrolyte in the electrode, another terminal 104 of the electrode lead 64, switch 28, the coil of relay 66 and ground. If sufficient dectrolyte is present when switch 28 is closed, relay 66 is energized, closing contact set 66A which supplies operating pow .1" o oscillator 14, and opening contact set 66B which breaks the series circuit from voltage source V via contact set 668 and neon bulb 68 and ground to deenergize bulb 68.
If the electrolyte is insufficient, relay 66 is not energized and oscillator 14 is made inoperative, while bulb 68 is energized to direct attention to the insufficiency of electrolyte in electrode 100.
The R.F. oscillator 14 comprises transistor T1 and transformer 70 whose primary winding is connected between the collector of the transistor and ground. The output winding of the transformer is connected to a voltage source V and the input of power amplifier 16. The feedback winding of the transformer has one end connected to the base of the transistor, the other end being connected to transfer contact 56B, and a center tap being connected to relay contact 60A. The emitter of the transistor T1 is connected via contact set 66A to operating voltage source V. A timing capacitor 72 connects the emitter to junction 74 which is connected to fixed contact 56C. Resistor 76 connects junction 74 to ground while resistor 78 connects junction 74 to contact 608.
When relay 66 is energized, an operating voltage is applied to the transistor T1 by virtue of the closing of contact set 66A.
Now, if relay 56 is energized, the feedback winding of transformer 70 is connected to the emitter of the transistor via capacitor 72 and the oscillator 14 operates in the continuous wave mode with a frequency determined by the constants of the transformer, the capacitor 72 and the load on the transformer. The frequency may thus be set at l mHz. However, when relay 60 is energized the center tap of transformer 70 is connected to junction 74. Now, as capacitor 72 charges via resistor 76, the oscillator is turned ofi until the base-emitter junction of the transistor is forward biased. At that time the oscillator oscillates at 1 mHz. for a period of time determined by the time required for capacitor 72 to discharge via resistor 78 to a value which again back biases the base-emitter junction. By a suitable choice of values for resistor 78 it is possible to cause the oscillator to block at a kHz. rate.
The power amplifier 16 is conventional in form and whose gain is controlled by shifting its operating voltage which is supplied by line 52. Gain control amplifier 50, difference amplifier 38 and square-law detector 42 are known devices. Active electrode 24 takes the form of known electrosurgical probes regularly used in the art.
The indifferent electrode 100 is shown in detail in FIGS. 2 4; the same comprising a conductive base member which may take the form of a sheet of plastic such as polyvinyl chloride (PVC) whose top surface is metallized as by depositing aluminum or the like thereon by known techniques. Tabs 112, 114 are affixed to the bottom surface of member 110 at the opposite ends thereof, in the form of adhesive tapes, for affixing the electrode to patient 12.
A porous sheet 116 of flexible spongy material such as sponge rubber, latex or polyurethane foam, or the like, is fixed to the top metallized surface of member 110 by an appropriate adhesive. The porous sheet 116 is impregnated with nontoxic electrolyte such as a saturated saline solution. The solution is preferably rendered somewhat viscous by adding gelatine thereto, to thereby reduce the evaporation of the same.
A protective plastic film bag 118 encloses the electrode 100 including the saturated sheet 116 and the exposed adhesive surfaces of tabs 112, 114. Bag 118 provides a leakproof container for the electrolyte contained in sheet 116, while the same is in storage. When electrode 100 is to be used, no additional electrolyte need be added to sheet 116. Also, bag 118 serves as a germproof shield for its contents and need be sterilized but once when the same is filled. The bag protects the adhesive areas of the tabs 112, 114 until ready for use in applying the electrode in place.
At the time of use of electrode 100, the bag 1 18 is opened to expose sheet 116 and tabs 112, 114. The top of sheet 116 is placed against the patient and held in place by adhesive tabs- 112, l 14. A terminal connector is clipped to the electrode.
A terminal connector 120 for attachment to electrode 100, is shown in FIGS. 5, 6. Connector 120 comprises a pair of plates 122, 124 which are hingedly interconnected by ear portions extending toward each other at the side edges thereof, as at 126, 128. Plates 122, 124 are formed of Nylon or the like to be resistant to sterilizing temperatures. A spring biases the forward jawlike portions of plates 122, 124 toward each other.
A pair of stainless steel terminal blocks 102, 104 are suitably affixed to the underside of top plate 122 and signal leads 62, 64 are respectively connected to said blocks. To clip the connector 120 to electrode 100, the rear portions of plates 122, 124 are pinched together to open the jaw portions to receive the edge portion of electrode 100 therebetween. The terminal blocks 102, 104 will then embed themselves in the porous sheet 116 to make good contact therewith. Terminal blocks 102, 104 are electrically interconnected only when sheet 116 is saturated with electrolyte and a measurement of the conductivity between the terminal blocks will determine the presence or absence of electrolyte.
The on/off switch 28 may be of the conventional foot pedal operated type. Alternatively such switch may be finger operated and mounted on the active electrode 24. Also the switch may be of the reed type which has a magnet to operate the same. Obviously, the foot operated and finger operated switches may be connected in parallel to afford a maximum of convenience in operation.
1. High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising first and second electrodes, each of said electrodes being adapted for electrically contacting tissue whereby an electric current path is established between said electrodes via said tissue, means for generating a high frequency electric current having a controllably varying amplitude, means for connecting said generating means to said electrodes, reference means for establishing a desired amplitude for the current passing through the tissue, sensing means for sensing the amplitude of the actual current passing through the tissue, and control means responsive to said reference means and said sensing means for controlling said generating means to generate a high frequency electric current having an amplitude substantially equal to said desired amplitude.
2. Apparatus as in claim 1 wherein said generating means includes means for selectively operating said generating means to operate in a first mode to generate a continuous alternating current, or in a second mode to generate timespaced packets of alternating current.
3. Apparatus as in claim 2 wherein said reference means comprises means for establishing a first desired amplitude for electric current related to said continuous alternating current generated by said generating means and a second desired amplitude for electric current related to said time-spaced packets of alternating current generated by said generating means, and
further comprising selection means for simultaneously controlling the mode of operation of said generating means and controlling which desired amplitude of electric current is received by said control means for controlling said generating means.
4. The apparatus of claim 1 wherein said first electrode is an active electrode and said second electrode is an indifferent electrode, and means for rendering said generating means inoperative when an open circuit exists in the electrical circuit including the tissue, said indifferent electrode and said generating means.
5. High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising: a controllably operable generating means for generating a high frequency electric current; an active electrode adapted to be applied to tissue at the situs of the operation; an indifferent electrode for contact with tissue at the situs of the operation, said indifferent electrode comprising a sheet of porous material, adhesive means connected to said sheet of material for removably affixing said indifferent electrode to tissue, and a pair of spaced electrical terminals in contact with said porous material; circuit means for connecting said active electrode and said terminals of said indifferent electrode to said generating means; and control means for rendering said generating means inoperative when the conductivity in a circuit including the tissue, said indifferent electrode and said circuit means connecting said indifferent electrode to said generating means is less than a given value.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3478744 *||Dec 30, 1964||Nov 18, 1969||Leiter Harry||Surgical apparatus|
|DE1139927B *||Jan 3, 1961||Nov 22, 1962||Friedrich Laber||Hochfrequenz-Chirurgiegeraet|
|DE1178528B *||Dec 14, 1962||Sep 24, 1964||Parisienne D Expl Des Etabliss||Elektrochirurgisches Geraet zur diathermischen Koagulation|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3804096 *||Nov 30, 1972||Apr 16, 1974||Dentsply Int Inc||Electrosurgical device|
|US3826245 *||Feb 9, 1973||Jul 30, 1974||Statham Instrument Inc||Electrodes employing disposable electropods for cardiac instruments|
|US3885569 *||Nov 21, 1972||May 27, 1975||Birtcher Corp||Electrosurgical unit|
|US3897787 *||Dec 27, 1973||Aug 5, 1975||Olympus Optical Co||Power source device for an electric surgical knife|
|US3913583 *||Jun 3, 1974||Oct 21, 1975||Sybron Corp||Control circuit for electrosurgical units|
|US3923063 *||Jul 15, 1974||Dec 2, 1975||Sybron Corp||Pulse control circuit for electrosurgical units|
|US3946738 *||Oct 24, 1974||Mar 30, 1976||Newton David W||Leakage current cancelling circuit for use with electrosurgical instrument|
|US3961623 *||Jan 17, 1975||Jun 8, 1976||Medical Research Laboratories, Inc.||Method of using a disposable electrode pad|
|US3963030 *||Nov 1, 1974||Jun 15, 1976||Valleylab, Inc.||Signal generating device and method for producing coagulation electrosurgical current|
|US3964487 *||Dec 9, 1974||Jun 22, 1976||The Birtcher Corporation||Uncomplicated load-adapting electrosurgical cutting generator|
|US3987796 *||Jul 2, 1975||Oct 26, 1976||Dentsply Research & Development Corporation||Electrosurgical device|
|US4016882 *||Mar 5, 1975||Apr 12, 1977||Cavitron Corporation||Neurosonic aspirator and method|
|US4051855 *||Feb 6, 1976||Oct 4, 1977||Ipco Hospital Supply Corporation, Whaledent International Division||Electrosurgical unit|
|US4102341 *||Dec 16, 1976||Jul 25, 1978||Olympus Optical Co., Ltd.||Electric knife device|
|US4114622 *||Jun 1, 1976||Sep 19, 1978||Dentsply Research And Development Corporation||Electrosurgical device|
|US4114623 *||Jul 29, 1976||Sep 19, 1978||Karl Storz Endoscopy-America, Inc.||Cutting and coagulation apparatus for surgery|
|US4121590 *||Mar 14, 1977||Oct 24, 1978||Dentsply Research And Development Corporation||System for monitoring integrity of a patient return circuit|
|US4122854 *||Aug 14, 1974||Oct 31, 1978||Matburn (Holdings) Limited||Electrosurgical apparatus|
|US4123673 *||Mar 14, 1977||Oct 31, 1978||Dentsply Research And Development Corporation||Control circuit for an electrical device|
|US4126137 *||Jan 21, 1977||Nov 21, 1978||Minnesota Mining And Manufacturing Company||Electrosurgical unit|
|US4164214 *||Jul 25, 1977||Aug 14, 1979||The Regents Of The University Of California||Method and apparatus for measuring the sensitivity of teeth|
|US4184492 *||May 30, 1978||Jan 22, 1980||Karl Storz Endoscopy-America, Inc.||Safety circuitry for high frequency cutting and coagulating devices|
|US4188927 *||Jan 12, 1978||Feb 19, 1980||Valleylab, Inc.||Multiple source electrosurgical generator|
|US4209018 *||May 30, 1978||Jun 24, 1980||Karl Fastenmeier||Tissue coagulation apparatus and method|
|US4303073 *||Jan 17, 1980||Dec 1, 1981||Medical Plastics, Inc.||Electrosurgery safety monitor|
|US4343308 *||Jun 9, 1980||Aug 10, 1982||Gross Robert D||Surgical ground detector|
|US4494541 *||Nov 2, 1981||Jan 22, 1985||Medical Plastics, Inc.||Electrosurgery safety monitor|
|US4651280 *||Dec 11, 1985||Mar 17, 1987||Chang Sien S||Electrosurgical control system using tissue conductivity|
|US4658819 *||Sep 13, 1983||Apr 21, 1987||Valleylab, Inc.||Electrosurgical generator|
|US4687004 *||Nov 30, 1977||Aug 18, 1987||Zenex Corporation||Dual element electrical connector|
|US4722761 *||Mar 28, 1986||Feb 2, 1988||Baxter Travenol Laboratories, Inc.||Method of making a medical electrode|
|US4727874 *||Sep 10, 1984||Mar 1, 1988||C. R. Bard, Inc.||Electrosurgical generator with high-frequency pulse width modulated feedback power control|
|US4769519 *||Jan 14, 1987||Sep 6, 1988||Metcal, Inc.||Ferromagnetic element with temperature regulation|
|US4818954 *||Feb 6, 1987||Apr 4, 1989||Karl Storz Endoscopy-America, Inc.||High-frequency generator with automatic power-control for high-frequency surgery|
|US4969885 *||Feb 7, 1990||Nov 13, 1990||Erbe Elektromedizin Gmbh||High frequency surgery device for cutting and/or coagulating biologic tissue|
|US5160317 *||Jan 3, 1991||Nov 3, 1992||Costin John A||Computer controlled smart phacoemulsification method and apparatus|
|US5279547 *||Dec 20, 1991||Jan 18, 1994||Alcon Surgical Inc.||Computer controlled smart phacoemulsification method and apparatus|
|US5417687 *||Apr 30, 1993||May 23, 1995||Medical Scientific, Inc.||Bipolar electrosurgical trocar|
|US5422567 *||Dec 27, 1993||Jun 6, 1995||Valleylab Inc.||High frequency power measurement|
|US5423809 *||Aug 30, 1993||Jun 13, 1995||Valleylab Inc.||Electrosurgical control for a trocar|
|US5437662 *||Feb 17, 1994||Aug 1, 1995||American Cardiac Ablation Co., Inc.||Fluid cooled electrosurgical cauterization system|
|US5484434 *||Dec 6, 1993||Jan 16, 1996||New Dimensions In Medicine, Inc.||Electrosurgical scalpel|
|US5498261 *||Dec 20, 1991||Mar 12, 1996||Advanced Cardiovascular Systems, Inc.||Thermal angioplasty system|
|US5520633 *||Nov 8, 1993||May 28, 1996||Costin; John A.||Computer controlled smart phacoemulsification method and apparatus|
|US5540681 *||Jan 10, 1994||Jul 30, 1996||Medtronic Cardiorhythm||Method and system for radiofrequency ablation of tissue|
|US5573533 *||Apr 10, 1992||Nov 12, 1996||Medtronic Cardiorhythm||Method and system for radiofrequency ablation of cardiac tissue|
|US5584830 *||Mar 30, 1994||Dec 17, 1996||Medtronic Cardiorhythm||Method and system for radiofrequency ablation of cardiac tissue|
|US5658279 *||Mar 21, 1995||Aug 19, 1997||Medical Scientific, Inc.||Bipolar electrosurgical trocar|
|US5688269 *||Mar 30, 1993||Nov 18, 1997||Electroscope, Inc.||Electrosurgical apparatus for laparoscopic and like procedures|
|US5713896 *||May 10, 1995||Feb 3, 1998||Medical Scientific, Inc.||Impedance feedback electrosurgical system|
|US5769841 *||Jun 13, 1995||Jun 23, 1998||Electroscope, Inc.||Electrosurgical apparatus for laparoscopic and like procedures|
|US5772659 *||Sep 26, 1995||Jun 30, 1998||Valleylab Inc.||Electrosurgical generator power control circuit and method|
|US5944715 *||Nov 25, 1996||Aug 31, 1999||Gyrus Medical Limited||Electrosurgical instrument|
|US5976128 *||Jun 13, 1997||Nov 2, 1999||Gebrueder Berchtold Gmbh & Co.||Electrosurgical high frequency generator|
|US6004319 *||Jun 20, 1996||Dec 21, 1999||Gyrus Medical Limited||Electrosurgical instrument|
|US6007532 *||Aug 29, 1997||Dec 28, 1999||3M Innovative Properties Company||Method and apparatus for detecting loss of contact of biomedical electrodes with patient skin|
|US6013076 *||Oct 25, 1996||Jan 11, 2000||Gyrus Medical Limited||Electrosurgical instrument|
|US6015406 *||Aug 21, 1996||Jan 18, 2000||Gyrus Medical Limited||Electrosurgical instrument|
|US6027501 *||Jun 20, 1998||Feb 22, 2000||Gyrus Medical Limited||Electrosurgical instrument|
|US6056746 *||Mar 27, 1998||May 2, 2000||Gyrus Medical Limited||Electrosurgical instrument|
|US6090106 *||Mar 26, 1998||Jul 18, 2000||Gyrus Medical Limited||Electrosurgical instrument|
|US6093186 *||Dec 18, 1997||Jul 25, 2000||Gyrus Medical Limited||Electrosurgical generator and system|
|US6174308||May 26, 1999||Jan 16, 2001||Gyrus Medical Limited||Electrosurgical instrument|
|US6210405||Jun 17, 1997||Apr 3, 2001||Gyrus Medical Limited||Under water treatment|
|US6234178||May 27, 1999||May 22, 2001||Gyrus Medical Limited||Electrosurgical instrument|
|US6251106||May 21, 1998||Jun 26, 2001||Sherwood Services Ag||Electrosurgical generator power control circuit and method|
|US6261286||Oct 16, 1998||Jul 17, 2001||Gyrus Medical Limited||Electrosurgical generator and system|
|US6277114||Mar 18, 1999||Aug 21, 2001||Gyrus Medical Limited||Electrode assembly for an electrosurical instrument|
|US6293942||May 2, 1996||Sep 25, 2001||Gyrus Medical Limited||Electrosurgical generator method|
|US6306134||Oct 16, 1998||Oct 23, 2001||Gyrus Medical Limited||Electrosurgical generator and system|
|US6364877||Oct 16, 1998||Apr 2, 2002||Gyrus Medical Limited||Electrosurgical generator and system|
|US6416509||Mar 26, 1998||Jul 9, 2002||Gyrus Medical Limited||Electrosurgical generator and system|
|US6482202||Jan 10, 2001||Nov 19, 2002||Gyrus Medical Limited||Under water treatment|
|US6565561||Apr 3, 2000||May 20, 2003||Cyrus Medical Limited||Electrosurgical instrument|
|US6780180||Mar 8, 2000||Aug 24, 2004||Gyrus Medical Limited||Electrosurgical instrument|
|US6790206 *||Jan 31, 2002||Sep 14, 2004||Scimed Life Systems, Inc.||Compensation for power variation along patient cables|
|US7044948||Dec 4, 2003||May 16, 2006||Sherwood Services Ag||Circuit for controlling arc energy from an electrosurgical generator|
|US7131860||Nov 20, 2003||Nov 7, 2006||Sherwood Services Ag||Connector systems for electrosurgical generator|
|US7137980||May 1, 2003||Nov 21, 2006||Sherwood Services Ag||Method and system for controlling output of RF medical generator|
|US7169145 *||Nov 21, 2003||Jan 30, 2007||Megadyne Medical Products, Inc.||Tuned return electrode with matching inductor|
|US7255694||Dec 4, 2003||Aug 14, 2007||Sherwood Services Ag||Variable output crest factor electrosurgical generator|
|US7300435||Nov 21, 2003||Nov 27, 2007||Sherwood Services Ag||Automatic control system for an electrosurgical generator|
|US7303557||Dec 27, 2004||Dec 4, 2007||Sherwood Services Ag||Vessel sealing system|
|US7316682 *||Dec 17, 2002||Jan 8, 2008||Aaron Medical Industries, Inc.||Electrosurgical device to generate a plasma stream|
|US7364577||Jul 24, 2003||Apr 29, 2008||Sherwood Services Ag||Vessel sealing system|
|US7396336||Oct 27, 2004||Jul 8, 2008||Sherwood Services Ag||Switched resonant ultrasonic power amplifier system|
|US7416437||Aug 23, 2006||Aug 26, 2008||Sherwood Services Ag||Connector systems for electrosurgical generator|
|US7422589||Aug 12, 2005||Sep 9, 2008||Encision, Inc.||System and method for performing an electrosurgical procedure|
|US7443175||Jul 14, 2006||Oct 28, 2008||Covidien Ag||Surgical testing instrument and system|
|US7465302||Aug 12, 2005||Dec 16, 2008||Encision, Inc.||System and method for performing an electrosurgical procedure|
|US7513896||Jan 24, 2006||Apr 7, 2009||Covidien Ag||Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling|
|US7572242||Aug 19, 2005||Aug 11, 2009||Alcon, Inc.||Method of operating an ultrasound handpiece|
|US7625388||Dec 1, 2009||Alcon, Inc.||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US7628786||May 16, 2005||Dec 8, 2009||Covidien Ag||Universal foot switch contact port|
|US7637907||Sep 19, 2006||Dec 29, 2009||Covidien Ag||System and method for return electrode monitoring|
|US7645255||Jan 12, 2010||Alcon, Inc.||Method of controlling a surgical system based on irrigation flow|
|US7645256||Jan 12, 2010||Alcon, Inc.||Ultrasound handpiece|
|US7648499||Mar 21, 2006||Jan 19, 2010||Covidien Ag||System and method for generating radio frequency energy|
|US7651490||Jan 26, 2010||Alcon, Inc.||Ultrasonic handpiece|
|US7651492||Jan 26, 2010||Covidien Ag||Arc based adaptive control system for an electrosurgical unit|
|US7651493||Jan 26, 2010||Covidien Ag||System and method for controlling electrosurgical snares|
|US7713202||Jul 26, 2005||May 11, 2010||Alcon, Inc.||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US7722601||Apr 30, 2004||May 25, 2010||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US7727193||Jul 26, 2005||Jun 1, 2010||Alcon, Inc.||Method of controlling a surgical system based on a rate of change of an operating parameter|
|US7731717||Aug 8, 2006||Jun 8, 2010||Covidien Ag||System and method for controlling RF output during tissue sealing|
|US7749217||May 6, 2003||Jul 6, 2010||Covidien Ag||Method and system for optically detecting blood and controlling a generator during electrosurgery|
|US7758538||Jul 26, 2005||Jul 20, 2010||Alcon, Inc.||Method of controlling a surgical system based on irrigation flow|
|US7766693||Aug 3, 2010||Covidien Ag||Connector systems for electrosurgical generator|
|US7766905||Aug 3, 2010||Covidien Ag||Method and system for continuity testing of medical electrodes|
|US7780662||Aug 24, 2010||Covidien Ag||Vessel sealing system using capacitive RF dielectric heating|
|US7789880 *||Sep 7, 2010||Jacques Hamou||Device for resection and/or ablation of organic tissue by means of high-frequency current|
|US7794457||Sep 28, 2006||Sep 14, 2010||Covidien Ag||Transformer for RF voltage sensing|
|US7804308||Sep 28, 2010||Covidien Ag||Surgical testing instrument and system|
|US7811255||Oct 12, 2010||Alcon, Inc.||Method of controlling a surgical system based on a rate of change of an operating parameter|
|US7822470||Oct 9, 2002||Oct 26, 2010||Osypka Medical Gmbh||Method for determining the left-ventricular ejection time TLVE of a heart of a subject|
|US7824400||Mar 3, 2006||Nov 2, 2010||Covidien Ag||Circuit for controlling arc energy from an electrosurgical generator|
|US7834484||Nov 16, 2010||Tyco Healthcare Group Lp||Connection cable and method for activating a voltage-controlled generator|
|US7837680||Nov 23, 2010||Megadyne Medical Products, Inc.||Tuned return electrode with matching inductor|
|US7871410 *||Oct 28, 2003||Jan 18, 2011||Cathrx Ltd||System for, and method of, heating a biological site in a patient's body|
|US7901400||Mar 8, 2011||Covidien Ag||Method and system for controlling output of RF medical generator|
|US7904141||Mar 22, 2006||Mar 8, 2011||Osypka Medical Gmbh||System and apparatus for determining the left-ventricular ejection time TLVE of a heart of a subject|
|US7927328||Jan 24, 2007||Apr 19, 2011||Covidien Ag||System and method for closed loop monitoring of monopolar electrosurgical apparatus|
|US7947039||Dec 12, 2005||May 24, 2011||Covidien Ag||Laparoscopic apparatus for performing electrosurgical procedures|
|US7972328||Jan 24, 2007||Jul 5, 2011||Covidien Ag||System and method for tissue sealing|
|US7972332||Jul 5, 2011||Covidien Ag||System and method for controlling electrosurgical snares|
|US8007494||Aug 30, 2011||Encision, Inc.||Device and method to prevent surgical burns|
|US8012150||Apr 30, 2004||Sep 6, 2011||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US8025660||Sep 27, 2011||Covidien Ag||Universal foot switch contact port|
|US8034049||Aug 8, 2006||Oct 11, 2011||Covidien Ag||System and method for measuring initial tissue impedance|
|US8048020||Nov 1, 2011||Alcon, Inc.||Method of controlling a surgical system based on irrigation flow|
|US8070711||Dec 9, 2009||Dec 6, 2011||Alcon Research, Ltd.||Thermal management algorithm for phacoemulsification system|
|US8080008||Dec 20, 2011||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US8096961||Jun 27, 2008||Jan 17, 2012||Covidien Ag||Switched resonant ultrasonic power amplifier system|
|US8104956||Oct 23, 2003||Jan 31, 2012||Covidien Ag||Thermocouple measurement circuit|
|US8105323||Oct 24, 2006||Jan 31, 2012||Covidien Ag||Method and system for controlling output of RF medical generator|
|US8113057||Jun 27, 2008||Feb 14, 2012||Covidien Ag||Switched resonant ultrasonic power amplifier system|
|US8147485||Feb 23, 2009||Apr 3, 2012||Covidien Ag||System and method for tissue sealing|
|US8172786||May 8, 2012||Alcon Research, Ltd.||Method of operating an ultrasound handpiece|
|US8187262||Jun 3, 2009||May 29, 2012||Covidien Ag||Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling|
|US8202271||Feb 25, 2009||Jun 19, 2012||Covidien Ag||Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling|
|US8216220||Jul 10, 2012||Tyco Healthcare Group Lp||System and method for transmission of combined data stream|
|US8216223||Jul 10, 2012||Covidien Ag||System and method for tissue sealing|
|US8226639||Jul 24, 2012||Tyco Healthcare Group Lp||System and method for output control of electrosurgical generator|
|US8231615||Jul 31, 2012||Senorx, Inc.||Electrosurgical medical system and method|
|US8231616||Jul 31, 2012||Covidien Ag||Transformer for RF voltage sensing|
|US8241278||Aug 14, 2012||Covidien Ag||Laparoscopic apparatus for performing electrosurgical procedures|
|US8251989||Jun 13, 2007||Aug 28, 2012||Encision, Inc.||Combined bipolar and monopolar electrosurgical instrument and method|
|US8257307||Oct 12, 2009||Sep 4, 2012||Alcon Research, Ltd.||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US8267928||Mar 29, 2011||Sep 18, 2012||Covidien Ag||System and method for closed loop monitoring of monopolar electrosurgical apparatus|
|US8267929||Dec 16, 2011||Sep 18, 2012||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US8287528||Mar 28, 2008||Oct 16, 2012||Covidien Ag||Vessel sealing system|
|US8298223||Oct 30, 2012||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US8298225||Oct 30, 2012||Tyco Healthcare Group Lp||System and method for return electrode monitoring|
|US8303530||Nov 6, 2012||Novartis Ag||Method of operating an ultrasound handpiece|
|US8303580||Apr 5, 2010||Nov 6, 2012||Covidien Ag||Method and system for programming and controlling an electrosurgical generator system|
|US8340756||Dec 25, 2012||Tony Picciano||Electronic stimulation device|
|US8353905||Jun 18, 2012||Jan 15, 2013||Covidien Lp||System and method for transmission of combined data stream|
|US8403851||Mar 26, 2013||Novartis Ag||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US8409190||Nov 14, 2011||Apr 2, 2013||Bovie Medical Corporation||Electrosurgical device to generate a plasma stream|
|US8414605||Jul 8, 2011||Apr 9, 2013||Alcon Research, Ltd.||Vacuum level control of power for phacoemulsification hand piece|
|US8430838||Jan 6, 2010||Apr 30, 2013||Novartis Ag||Method of controlling a surgical system based on irrigation flow|
|US8460284||Jun 11, 2013||Encision, Inc.||Multiple parameter fault detection in electrosurgical instrument shields|
|US8475446||Jul 9, 2012||Jul 2, 2013||Senorx, Inc.||Electrosurgical medical system and method|
|US8475447||Aug 23, 2012||Jul 2, 2013||Covidien Ag||System and method for closed loop monitoring of monopolar electrosurgical apparatus|
|US8485993||Jan 16, 2012||Jul 16, 2013||Covidien Ag||Switched resonant ultrasonic power amplifier system|
|US8486061||Aug 24, 2012||Jul 16, 2013||Covidien Lp||Imaginary impedance process monitoring and intelligent shut-off|
|US8512332||Sep 21, 2007||Aug 20, 2013||Covidien Lp||Real-time arc control in electrosurgical generators|
|US8523812||Sep 3, 2010||Sep 3, 2013||Alcon Research, Ltd.||Method of controlling a surgical system based on a rate of change of an operating parameter|
|US8523855||Aug 23, 2010||Sep 3, 2013||Covidien Ag||Circuit for controlling arc energy from an electrosurgical generator|
|US8556890||Dec 14, 2009||Oct 15, 2013||Covidien Ag||Arc based adaptive control system for an electrosurgical unit|
|US8562538||Mar 7, 2011||Oct 22, 2013||Osypka Medical Gmbh||System for determining the left-ventricular ejection time TLVE of a heart of a subject|
|US8579929||Sep 3, 2010||Nov 12, 2013||Alcon Research, Ltd.||Torsional ultrasound hand piece that eliminates chatter|
|US8623040||Jul 1, 2009||Jan 7, 2014||Alcon Research, Ltd.||Phacoemulsification hook tip|
|US8647340||Jan 4, 2012||Feb 11, 2014||Covidien Ag||Thermocouple measurement system|
|US8652121||Oct 31, 2007||Feb 18, 2014||Senorx, Inc.||Universal medical device control console|
|US8663214||Jan 24, 2007||Mar 4, 2014||Covidien Ag||Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm|
|US8685016||Feb 23, 2009||Apr 1, 2014||Covidien Ag||System and method for tissue sealing|
|US8696650||Jul 24, 2008||Apr 15, 2014||Senorx, Inc.||Universal medical device control console|
|US8734438||Oct 21, 2005||May 27, 2014||Covidien Ag||Circuit and method for reducing stored energy in an electrosurgical generator|
|US8753334||May 10, 2006||Jun 17, 2014||Covidien Ag||System and method for reducing leakage current in an electrosurgical generator|
|US8758336||Oct 13, 2009||Jun 24, 2014||Encision, Inc.||System and method for monitoring electrosurgical systems|
|US8764741||Aug 8, 2007||Jul 1, 2014||Senorx, Inc.||High frequency power source|
|US8771301||Sep 11, 2009||Jul 8, 2014||Alcon Research, Ltd.||Ultrasonic handpiece|
|US8777941||May 10, 2007||Jul 15, 2014||Covidien Lp||Adjustable impedance electrosurgical electrodes|
|US8784357||Sep 15, 2010||Jul 22, 2014||Alcon Research, Ltd.||Phacoemulsification hand piece with two independent transducers|
|US8808161||Oct 23, 2003||Aug 19, 2014||Covidien Ag||Redundant temperature monitoring in electrosurgical systems for safety mitigation|
|US8814894||Sep 11, 2009||Aug 26, 2014||Novartis Ag||Ultrasound handpiece|
|US8876812||Feb 10, 2010||Nov 4, 2014||Megadyne Medical Products, Inc.||Self-limiting electrosurgical return electrode with pressure sore reduction and heating capabilities|
|US8882760||Aug 27, 2008||Nov 11, 2014||Senorx, Inc.||Electrosurgical medical system and method|
|US8966981||Jul 16, 2013||Mar 3, 2015||Covidien Ag||Switched resonant ultrasonic power amplifier system|
|US8974412||Aug 3, 2012||Mar 10, 2015||Novartis Ag||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US9113900||Jan 31, 2012||Aug 25, 2015||Covidien Ag||Method and system for controlling output of RF medical generator|
|US9116179||Nov 1, 2013||Aug 25, 2015||Covidien Lp||System and method for voltage and current sensing|
|US9119624||Oct 8, 2013||Sep 1, 2015||Covidien Ag||ARC based adaptive control system for an electrosurgical unit|
|US9168089||Jan 31, 2012||Oct 27, 2015||Covidien Ag||Method and system for controlling output of RF medical generator|
|US9186200||May 30, 2012||Nov 17, 2015||Covidien Ag||System and method for tissue sealing|
|US9192424||May 31, 2012||Nov 24, 2015||Covidien Lp||AC active load|
|US9233021||Oct 24, 2013||Jan 12, 2016||Alcon Research, Ltd.||Phacoemulsification hook tip|
|US9254165||Mar 6, 2013||Feb 9, 2016||Encision, Inc.||Multiple parameter fault detection in electrosurgical instrument shields|
|US9271790||Aug 20, 2013||Mar 1, 2016||Coviden Lp||Real-time arc control in electrosurgical generators|
|US9282989||Oct 31, 2012||Mar 15, 2016||Novartis Ag||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US9314294||Mar 7, 2013||Apr 19, 2016||Encision, Inc.||Enhanced control systems including flexible shielding and support systems for electrosurgical applications|
|US9366703||Jul 24, 2015||Jun 14, 2016||Covidien Lp||System and method for voltage and current sensing|
|US9387269||Mar 13, 2013||Jul 12, 2016||Bovie Medical Corporation||Cold plasma jet hand sanitizer|
|US9408664||Mar 15, 2013||Aug 9, 2016||Senorx, Inc.||Electrosurgical medical system and method|
|US20030163058 *||Oct 9, 2002||Aug 28, 2003||Osypka Markus J.||Method and apparatus for determining the left-ventricular ejection time TLVE of a heart of a subject|
|US20040116918 *||Dec 17, 2002||Jun 17, 2004||Konesky Gregory A.||Electrosurgical device to generate a plasma stream|
|US20040152996 *||May 23, 2002||Aug 5, 2004||Eberhard Gersing||Transformer-isolated alternating current power supply|
|US20050012414 *||Jul 16, 2004||Jan 20, 2005||Osypka Medical Gmbh||Method and apparatus for isolated transformation of a first voltage into a second voltage for measurement of electrical bioimpedances or bioconductances|
|US20050113817 *||Nov 21, 2003||May 26, 2005||Isaacson James D.||Tuned return electrode with matching inductor|
|US20050209560 *||Feb 28, 2005||Sep 22, 2005||Alcon, Inc.||Method of controlling a surgical system based on a rate of change of an operating parameter|
|US20050209561 *||Apr 5, 2004||Sep 22, 2005||Raphael Gordon||Method of detecting surgical events|
|US20050228425 *||Feb 28, 2005||Oct 13, 2005||Alcon, Inc.||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US20050261628 *||Jul 26, 2005||Nov 24, 2005||Alcon, Inc.||Method of controlling a surgical system based on a rate of change of an operating parameter|
|US20050261715 *||Jul 26, 2005||Nov 24, 2005||Alcon, Inc.||Method of controlling a surgical system based on a load on the cutting tip of a handpiece|
|US20050267504 *||Jul 26, 2005||Dec 1, 2005||Alcon, Inc.||Method of controlling a surgical system based on irrigation flow|
|US20050273091 *||Oct 28, 2003||Dec 8, 2005||Cathrxptyltd||System for, and method of, heating a biological site in a patient's body|
|US20050277869 *||Aug 19, 2005||Dec 15, 2005||Alcon, Inc.||Method of operating an ultrasound handpiece|
|US20060025760 *||May 6, 2003||Feb 2, 2006||Podhajsky Ronald J||Blood detector for controlling anesu and method therefor|
|US20060036180 *||Aug 12, 2004||Feb 16, 2006||Mikhail Boukhny||Ultrasonic handpiece|
|US20060041220 *||Jul 18, 2005||Feb 23, 2006||Alcon, Inc.||Ultrasound handpiece|
|US20060041251 *||Aug 12, 2005||Feb 23, 2006||Odell Roger C||Electrosurgical system and method|
|US20060041252 *||Aug 12, 2005||Feb 23, 2006||Odell Roger C||System and method for monitoring electrosurgical instruments|
|US20060041253 *||Aug 12, 2005||Feb 23, 2006||Newton David W||System and method for performing an electrosurgical procedure|
|US20060167363 *||Mar 22, 2006||Jul 27, 2006||Osypka Medical Gmbh||System and apparatus for determining the left-ventricular ejection time TLVE of a heart of a subject|
|US20070043303 *||Aug 17, 2006||Feb 22, 2007||Osypka Markus J||Method and apparatus for digital demodulation and further processing of signals obtained in the measurement of electrical bioimpedance or bioadmittance in an object|
|US20070049916 *||Sep 29, 2006||Mar 1, 2007||Megadyne Medical Products, Inc.||Tuned return electrode with matching inductor|
|US20070255271 *||Feb 8, 2007||Nov 1, 2007||Senorx, Inc.||High frequency power source|
|US20070282322 *||Aug 8, 2007||Dec 6, 2007||Senorx, Inc.||High frequency power source|
|US20080009855 *||Apr 27, 2007||Jan 10, 2008||Jacques Hamou||Device For Resection And/Or Ablation Of Organic Tissue By Means Of High-Frequency Current|
|US20080030206 *||Jul 14, 2006||Feb 7, 2008||Sherwood Services Ag||Surgical testing instrument and system|
|US20080071263 *||Sep 19, 2006||Mar 20, 2008||Sherwood Services Ag||System and method for return electrode monitoring|
|US20080172076 *||Nov 1, 2006||Jul 17, 2008||Alcon, Inc.||Ultrasound apparatus and method of use|
|US20080281253 *||May 10, 2007||Nov 13, 2008||Injev Valentine P||Method of Operating an Ultrasound Handpiece|
|US20090030405 *||Jul 24, 2008||Jan 29, 2009||Senorx, Inc.||Universal medical device control console|
|US20090039900 *||Oct 17, 2008||Feb 12, 2009||Covidien Ag||Surgical Testing Instrument and System|
|US20090069799 *||Aug 27, 2008||Mar 12, 2009||Senorx, Inc.||Electrosurgical medical system and method|
|US20090076493 *||Aug 27, 2008||Mar 19, 2009||Senorx, Inc.||Electrosurgical medical system and method|
|US20090088737 *||Aug 27, 2008||Apr 2, 2009||Senorx, Inc.||Electrosurgical medical system and method|
|US20090112204 *||Oct 24, 2008||Apr 30, 2009||Encision, Inc.||Multiple Parameter Fault Detection in Electrosurgical Instrument Shields|
|US20090306583 *||Dec 10, 2009||Mikhail Boukhny||Method of Operating An Ultrasound Handpiece|
|US20100004585 *||Sep 11, 2009||Jan 7, 2010||Mikhail Boukhny||Ultrasonic Handpiece|
|US20100036256 *||Feb 11, 2010||Mikhail Boukhny||Offset ultrasonic hand piece|
|US20100036406 *||Oct 12, 2009||Feb 11, 2010||Alcon, Inc.||Method of Controlling a Surgical System Based on a Load on the Cutting Tip of a Handpiece|
|US20100036464 *||Feb 11, 2010||Tony Picciano||Electronic stimulation device|
|US20100094321 *||Oct 10, 2008||Apr 15, 2010||Takayuki Akahoshi||Ultrasound Handpiece|
|US20100114335 *||Oct 31, 2007||May 6, 2010||Senrx, Inc.||Universal medical device control consol|
|US20100130914 *||Jan 6, 2010||May 27, 2010||Alcon, Inc.||Method Of Controlling A Surgical System Based On Irrigation Flow|
|US20100217260 *||Aug 26, 2010||Megadyne Medical Products, Inc.||Self-limiting electrosurgical return electrode with pressure sore reduction and heating capabilities|
|US20100241023 *||Sep 23, 2010||Tyco Healthcare Group Lp||System and Method for Return Electrode Monitoring|
|US20100324581 *||Sep 3, 2010||Dec 23, 2010||Alcon, Inc.||Torsional Ultrasound Hand Piece That Eliminates Chatter|
|US20110015563 *||Jan 20, 2011||Alcon, Inc.||Method Of Controlling A Surgical System Based On A Rate Of Change Of An Operating Parameter|
|US20110071517 *||Sep 22, 2010||Mar 24, 2011||Bovie Medical Corporation||Electrosurgical system to generate a pulsed plasma stream and method thereof|
|US20110137232 *||Dec 9, 2009||Jun 9, 2011||Alcon Research, Ltd.||Thermal Management Algorithm For Phacoemulsification System|
|US20110190601 *||Aug 4, 2011||Osypka Markus J||System for Determining the Left-Ventricular Ejection Time TLVE of a Heart of a Subject|
|US20140114303 *||Dec 31, 2013||Apr 24, 2014||Covidien Lp||Current-fed push-pull converter with passive voltage clamp|
|USRE33644 *||Jul 5, 1990||Jul 23, 1991||Metcal, Inc.||Ferromagnetic element with temperature regulation|
|USRE40388||May 8, 2003||Jun 17, 2008||Covidien Ag||Electrosurgical generator with adaptive power control|
|DE2602517A1 *||Jan 23, 1976||Jul 29, 1976||Dentsply Int Inc||Elektrochirurgische vorrichtung|
|DE3225221A1 *||Jul 6, 1982||Mar 24, 1983||Bard Inc C R||Elektrochirurgischer generator|
|EP0013613A1 *||Jan 7, 1980||Jul 23, 1980||Johnson & Johnson Products Inc.||Electrosurgical grounding pad|
|WO1993013718A1 *||Oct 27, 1992||Jul 22, 1993||Valleylab, Inc.||Electrosurgical control for a trocar|
|WO1994024949A1 *||Apr 29, 1994||Nov 10, 1994||Medical Scientific, Inc.||Impedance feedback electrosurgical system|
|WO1994024951A1 *||Apr 29, 1994||Nov 10, 1994||Medical Scientific, Inc.||Impedance feedback electrosurgical system|
|WO2002094090A2 *||May 23, 2002||Nov 28, 2002||Osypka Medical Gmbh||Transformer-isolated alternating current power supply|
|WO2002094090A3 *||May 23, 2002||Mar 6, 2003||Osypka Medical Gmbh||Transformer-isolated alternating current power supply|
|WO2003092520A1||May 6, 2003||Nov 13, 2003||Sherwood Services Ag||Blood detector for controlling anesu and method therefor|
|U.S. Classification||606/35, 606/38|
|International Classification||A61B18/14, G05F1/12, G05F1/10, A61B18/16|
|Cooperative Classification||A61B18/16, G05F1/12|
|European Classification||G05F1/12, A61B18/16|