Surgery – Instruments – Electrical application
Patent
1990-01-30
1991-03-19
Cohen, Lee S.
Surgery
Instruments
Electrical application
128798, A61B 1739
Patent
active
050007530
ABSTRACT:
A neutral electrode for a high frequency surgery device has three planar sub-electrodes, which are arranged side by side on a carrier consisting of insulating material. To improve monitoring of the contact of the sub-electrodes with the body of the patient, the two outer sub-electrodes have substantially triangular contact surfaces, with the respective hypotenuses of the triangular contact surfaces proceeding parallel to and spaced from each other, with a central, strip-shaped sub-electrode disposed between the hypotenuses of the outer sub-electrodes. The neutral electrode is intended for use with a monitoring system which will activate an alarm if the neutral electrode becomes detached from the patient to such an extent that the danger of injury to the patient exists. This is accomplished by monitoring a current or currents flowing through the patient between sub-electrodes. The neutral electrode does not have an axis of symmetry along which a detachment of the neutral electrode from the patient could occur which would fail to cause a sufficient impedance change to trigger the alarm in time to avoid injury to the patient.
REFERENCES:
patent: 4770173 (1988-09-01), Feucht et al.
patent: 4807621 (1989-02-01), Hagen et al.
patent: 4841966 (1989-06-01), Hagen et al.
Feucht Peter
Hagen Uwe
Cohen Lee S.
Siemens Aktiengesellschaft
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