High output electrosurgical unit

Details High output electrosurgical unit High output electrosurgical unit

1984-02-29

1986-02-11

Cohen, Lee S.

Surgery

Truss

Pad

12830317, 331183, 336183, A61B 1739

Patent

active

045693455

ABSTRACT:
An electrosurgical unit including voltage control circuitry which operates to limit the voltage at the electrosurgical electrodes when the unit is not in coagulation mode. The electrosurgical unit includes sensing circuitry for providing a signal representative of the voltage at the electrosurgical electrodes, a mode setting switch or dial for changing between a cut mode setting and a coagulation mode setting, a circuit for producing a mode signal, and an RF power generator responsive to the mode setting switch for providing a cut mode waveform at the electrode outputs when the mode setting switch is in cut mode and a coagulation mode waveform when the mode setting switch is in the coagulation mode setting. A voltage limiting circuit is responsive to the signal from the sensing circuitry and limits the voltage at the outputs when the electrosurgical unit in cut mode. Suppression circuitry responsive to the mode signal prevents the voltage limiting circuitry from operating in coagulation mode. The power generator includes a transformer having primary and secondary windings that are wound concentrically about the same axis and are spaced from each other along the same axis. The transformer has a high ratio of secondary to primary turns.

REFERENCES:
patent: 3594672 (1971-07-01), Frankel
patent: 3658067 (1972-04-01), Bross
patent: 3875945 (1975-04-01), Friedman
patent: 3952748 (1976-04-01), Kaliher et al.
patent: 3964487 (1976-06-01), Judson
patent: 4051855 (1977-10-01), Schneiderman
patent: 4092986 (1978-06-01), Schneiderman
patent: 4126137 (1978-11-01), Archibald
patent: 4281373 (1981-07-01), Mabille
patent: 4301801 (1981-11-01), Schneiderman
patent: 4429694 (1984-02-01), McGreevy

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