Current leakage control for electrosurgical generator

Details Current leakage control for electrosurgical generator Current leakage control for electrosurgical generator

1990-11-16

1992-10-06

Cohen, Lee S.

Surgery

Instruments

Electrical application

A61B 1739

Patent

active

051527626

ABSTRACT:
A current leakage control circuit regulates the output power of an electrosurgical generator to limit the amount of leakage current. The leakage current is monitored with a differential transformer which has the output and return leads of the electrosurgical generator as first and second windings. A third or sense winding produces a control signal whenever the currents in the output and return leads are not equal, thus indicating current leakage. The control signal is compared to a predetermined maximum safe level of leakage current. If this predetermined level is exceeded, a power control feedback loop of the electrosurgical generator reduces the output power to a sufficiently lower level to reduce the leakage current within a maximum acceptable limit.

REFERENCES:
patent: 3683923 (1972-08-01), Anderson
patent: 4094320 (1978-06-01), Newton et al.
patent: 4102341 (1978-07-01), Ikuno et al.
patent: 4437464 (1984-03-01), Crow
patent: 4462369 (1987-05-01), Ensslin
patent: 4727874 (1988-03-01), Bowers et al.

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