Electric surgical high-frequency instrument

Details Electric surgical high-frequency instrument Electric surgical high-frequency instrument

1990-03-23

1992-07-28

Cohen, Lee S.

Surgery

Instruments

Electrical application

606 39, 606 40, A61B 1739

Patent

active

051337118

ABSTRACT:
This invention relates to an electric surgical HF instrument having an HF urce (12) to which an inactive electrode (18) for tissue contact (17) and an active electrode (16) for surgical treatment can be connected via electrical conductors (15, 15'). The conductor of the active electrode (16) features an antifaradization capacitor (13). A control circuit (20, 21, 22, 23) for sensing a direct current component in the HF circuit is connected to at least one of the electrodes and furnishes an output signal for controlling the HF source (12). The control circuit features a proportional discharge detector circuit (20), the input end of which is connected via connecting leads (19, 19') and conductors (15, 15') to the electrodes (16, 18). The output of the discharge detector circuit (20) is connected to one input of a threshhold switch (22) which controls the HF source (12).

REFERENCES:
patent: 4114623 (1978-09-01), Meinke et al.
patent: 4271837 (1981-06-01), Schuler
patent: 4860745 (1989-08-01), Farin et al.
patent: 4969885 (1990-11-01), Farin

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