Surgery – Instruments – Electrical application
Patent
1990-03-21
1992-02-11
Cohen, Lee S.
Surgery
Instruments
Electrical application
A61B 1739
Patent
active
050872575
ABSTRACT:
At least one neutral electrodes insulated from each other is separately connected to the current return terminal of a high frequency electro-surgical equipment are applied in electrical contact with the skin of a patient while surgery is performed with the active electrode of the equipment. A low frequency alternating current is passed through the patient's flesh from one neutral electrode to the other to monitor the quality of contact between the neutral electrodes and the patient. The intensity of the intermeittent high frequency current or a corresponding setting of the high frequency surgery equipment is compared with a signal representative of the monitoring current so that warning signals and/or automatic shut-off of the high frequency equipment will occur when and only when the high frequency current for surgical cutting or coagulation is greater than that which is permissible for the electrical transition conductivity present at the time between the respective neutral electrodes and the skin of the patient without risk of thermal damage to the skin at the place the neutral electrode is applied.
REFERENCES:
patent: 3933157 (1976-01-01), Bjurwill et al.
patent: 4657015 (1987-04-01), Irnich
European Search Report No. 89 10 5740.
Farin Gunter
Geiselhart Franz
Klett Johannes
Cohen Lee S.
Erbe Elektromedizin GmbH
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