High frequency-high voltage level electrosurgical unit

Details High frequency-high voltage level electrosurgical unit High frequency-high voltage level electrosurgical unit

1976-01-26

1977-06-21

Michell, Robert W.

Surgery

Truss

Pad

12830317, A61B 1736, A61N 302

Patent

active

040305015

ABSTRACT:
A transistorized electrosurgical unit for selectively providing high fequency, high voltage level, cutting or coagulation currents to electrosurgical patient electrodes and including a plurality of parallel connected power stages actuatable by a control signal to supply power to an output transformer connected to the electrodes, which power stages each include a power transistor biased in a nonsaturated condition and connected in series with a constant current transistor, and a signal source transistor connected to such power transistor to supply a switching signal thereto and to serve as a current flow path whenever current flow through the power transistor is interrupted.

REFERENCES:
patent: 3478744 (1969-11-01), Leiter
patent: 3675655 (1972-07-01), Sittner
patent: 3699967 (1972-10-01), Anderson
patent: 3885569 (1975-05-01), Judson
patent: 3952748 (1976-04-01), Kaliher

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