Electrosurgical safety circuit and method of using same

Details Electrosurgical safety circuit and method of using same Electrosurgical safety circuit and method of using same

1976-09-09

1978-06-13

Howell, Kyle L.

Surgery

Truss

Pad

A61B 1736, A61N 300

Patent

active

040943208

ABSTRACT:
An improved electrosurgical safety circuit where the currents in the active and patient leads are monitored, the monitored currents being respectively rectified and then subtracted from one another. Whenever the active current exceeds the patient or return current by an amount corresponding to a dynamically variable threshold, an appropriate measure is taken such as the sounding of an alarm and/or the de-energization of the electrosurgical generator. The dynamic threshold varies in accordance with the level of the signal applied to the patient and compensates for leakage current through stray capacitance from the active lead to ground.
The patient lead is substantially grounded at radio frequencies through a frequency sensitive network. The frequency sensitive network may include a capacitor, the value of which is such as to provide the foregoing frequency response. Since as small a capacitor as possible must be used to provide a high impedance at low frequencies, and since the radio frequency voltage across the capacitor must be kept low to thereby keep the voltage patient low at radio frequencies, a further network is employed to enable the use of a small capacitor while at the same time decreasing the effective voltage thereacross whereby protection of the patient is enhanced.

REFERENCES:
patent: 3675655 (1972-07-01), Sittner
patent: 3683923 (1972-08-01), Anderson
patent: 3885569 (1975-05-01), Judson
patent: 3897787 (1975-08-01), Ikuno et al.
patent: 3946738 (1976-03-01), Newton et al.

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