Surgery – Instruments – Electrical application
Patent
1990-08-23
1993-03-23
Cohen, Lee S.
Surgery
Instruments
Electrical application
606 32, A61B 1739
Patent
active
051960087
ABSTRACT:
A method for monitoring a number of electrode surfaces of an electrode of the type used in an HF surgery device includes the steps, in a first stage of the method, of connecting one of the electrode surfaces to a current source and connecting a measuring unit via a first switch to at least two of the remaining electrode surfaces to be monitored and thereby forming measured values which are to be compared to each other for equality. In a second stage of the method, a different electrode surface is connected to the current source and the measuring unit is connected to different ones of the remaining electrode surfaces, and measured values are again obtained and compared for quality. The electrode surface which served as the auxiliary (i.e., current supplied) electrode in the first stage of the method may serve as one of the monitored electrode surfaces in the second stage. A circuit for practicing the method is also disclosed.
REFERENCES:
patent: 4416276 (1983-11-01), Newton et al.
patent: 4416277 (1983-11-01), Newton et al.
patent: 4754757 (1988-07-01), Feucht
patent: 4770173 (1988-09-01), Feucht et al.
Hagen Uwe
Kuenecke Peter
Cohen Lee S.
Siemens Aktiengesellschaft
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