Leakage current cancelling circuit for use with electrosurgical

Details Leakage current cancelling circuit for use with electrosurgical Leakage current cancelling circuit for use with electrosurgical

1974-10-24

1976-03-30

Frinks, Ronald L.

Surgery

Truss

Pad

12830317, 317 9A, 317 18D, A61B 1736, A61N 300

Patent

active

039467384

ABSTRACT:
Circuitry for cancelling leakage current is disclosed. The leakage cancelling circuit is utilized in conjunction wih the active or patient electrodes of an electrosurgical instrument used in electrosurgery. In electrosurgery, a radio frequency current is passed through a patient between an active electrode and a patient electrode with the active electrode determining the point where surgery is performed and the patient electrode being made surgically inactive by large patient contact area. Current leakage at the electrodes is caused by stray capacity to ground in an isolated system and excessive leakage from the active electrode to ground can cause surgery to be performed without a patient connection while excessive leakage from the patient electrode to ground can cause RF burns to the patient and perhaps to operating room personnel having contact with the patient. In one embodiment, current leakage is cancelled by addition of current to the patient connection in correct phase and magnitude to cancel the existing patient leakage currents, the added current being supplied through circuitry that includes a capacitor in series with the tertiary winding on the output power transformer supplying current to the active and patient electrodes. In a second embodiment, a series LC circuit is placed in parallel with the stray capacitance to cancel the same.

REFERENCES:
patent: 3601126 (1971-08-01), Estes
patent: 3675655 (1972-07-01), Sittner
patent: 3699967 (1972-10-01), Anderson
patent: 3804096 (1974-04-01), Gonser

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