04200105 is referenced by 133 patents and cites 6 patents.

The invention described herein is a safety circuit for preventing burns to a patient during an electrosurgical operation. In the preferred embodiment, the safety circuit includes a pair of monitors for sensing an imbalance between current flowing to a patient from a radio-frequency generator and current returning to the radio-frequency generator from the patient. When such an imbalance occurs as a result of a stray current path to ground from the patient, an alarm is actuated. In addition, a first alternate current path between chassis ground and the radio-frequency generator and a second alternate current path between system ground and chassis ground are included. A monitor in each alternate current path is designed to actuate an alarm upon detecting a predetermined flow of current. Not only do the monitors provide back-up for each other, but the first alternate path holds near ground potential a dispersive electrode which contacts the patient. Preferably, circuitry is also included for minimizing radio-frequency leakage from the lead carrying current to the patient.

Title
Electrosurgical safety circuit
Application Number
5/909866
Publication Number
4200105
Application Date
May 26, 1978
Publication Date
April 29, 1980
Inventor
Donald I Gonser
York
PA, US
Agent
John H Moore
Assignee
Dentsply Research & Development
DE, US
IPC
A61N 3/02
A61B 17/36
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