The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1992
Filed:
Mar. 23, 1990
Alfred Hagen, Tuttlingen, DE;
Delma elektro- und medizinische Apparatebau Gesellschaft mbH, Tuttlingen, DE;
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).