Surgery – Truss – Pad
Patent
1978-05-26
1980-04-29
Cohen, Lee S.
Surgery
Truss
Pad
12830317, A61B 1736, A61N 302
Patent
active
042001056
ABSTRACT:
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.
REFERENCES:
patent: 3683923 (1972-08-01), Anderson
patent: 3804096 (1974-04-01), Gonser
patent: 3905373 (1975-09-01), Gonser
patent: 4094320 (1978-06-01), Newton et al.
patent: 4102341 (1978-07-01), Ikuno et al.
Gonser et al., "Design Hazards of Electrosurgical Devices", Med. Inst., vol. 10, No. 2, Mar.-Apr. 1976.
Cohen Lee S.
Dentsply Research & Development Corp.
Moore John H.
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