Control apparatus for electrosurgical generator power output

Details Control apparatus for electrosurgical generator power output Control apparatus for electrosurgical generator power output

1995-06-06

1997-02-04

Shay, David M.

Surgery

Instruments

Electrical application

606 32, A61H 500

Patent

active

055993443

ABSTRACT:
A power control apparatus for an electrosurgical generator is used for controlling output power from the generator to the tissue or bodily fluids of a patient. The control apparatus rapidly determines the range of impedance of the load on the electrosurgical generator and adjusts the output power accordingly. Output current and output voltage from the electrosurgical generator are monitored and sent to a microprocessor. The microprocessor runs an algorithm that determines the impedance range of the load on the generator. The algorithm uses computational techniques, such as comparisons and bit shifting, that avoid long division and other time-consuming operations. The microprocessor can then adjust a high voltage power supply that effects the radio frequency amplifier stage. A method for controlling the power of the electrosurgical generator, including steps in the algorithm, is also disclosed.

REFERENCES:
patent: 4658819 (1987-04-01), Harris et al.
patent: 4961047 (1990-10-01), Carder
patent: 5370645 (1994-12-01), Klicek et al.
patent: 5403312 (1995-04-01), Yates et al.

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