Electrosurgical unit with regulated output

Details Electrosurgical unit with regulated output Electrosurgical unit with regulated output

1984-02-29

1986-03-11

Cohen, Lee S.

Surgery

Truss

Pad

12830317, 330 59, 331186, A61B 1739

Patent

active

045748012

ABSTRACT:
An electrosurgical unit having feedforward power regulation. In one embodiment there is an amplifier which produces a pulse modulated electrosurgical output signal. A microprocessor calculates an adjusted pulse width (duty cycle) just sufficient to account for the power changes due to voltage fluctuations. The microprocessor controls the pulse width of the gate voltage of a power transistor in the amplifier to regulate the amplifier output. In another embodiment the supply voltage is fed into the base drive circuitry of an amplifier power transistor through the photo-resistor side of an optoisolator. The lamp brightness of the optoisolator and thus the gain of the base drive circuitry is adjusted by the amplifier power level control. The nonlinearity of the optoisolator complements the nonlinearity of the amplifier so that the net gain in the amplifier drive at any power setting is just sufficient to account for the voltage fluctuation.

REFERENCES:
patent: 3471700 (1969-10-01), Presti
patent: 3801800 (1974-04-01), Newton
patent: 3812858 (1974-05-01), Oringer
patent: 3875945 (1975-04-01), Friedman
patent: 3923063 (1975-12-01), Andrews et al.
patent: 3963030 (1976-06-01), Newton
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patent: 4024467 (1977-05-01), Andrews et al.
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patent: 4092986 (1978-06-01), Schneiderman
patent: 4126137 (1978-11-01), Archibald
patent: 4191188 (1980-03-01), Belt
patent: 4343310 (1982-08-01), DuBose et al.
patent: 4438766 (1984-03-01), Bowers

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