Surgery – Instruments – Electrical application
Patent
1990-08-27
1992-05-19
Cohen, Lee S.
Surgery
Instruments
Electrical application
128798, A61B 1739
Patent
active
051144247
ABSTRACT:
A multipart planar electrode, suitable for use as a neutral electrode for an HF surgery device, has four sub-electrodes arranged on one side of a flexible, common carrier. At least three of these sub-electrodes have substantially the same area and at least two of the sub-electrodes have a limiting edge disposed parallel to and adjacent at least a portion of a separate edge of one of the remaining sub-electrodes. This insures that, if one of the sub-electrodes is used as an auxiliary electrode for a symmetry measurement of sub-currents, there will not be equality of the contact area of the electrodes with the patient's skin at the remaining sub-electrodes upon the occurrence of a straight-line release edge in an arbitrary direction. Because such equal areas will not occur, this will be detected by the symmetry measurement and an alarm indicating partial detachment of the electrode can be activated.
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patent: 4448199 (1984-05-01), Schmid
patent: 4619266 (1986-10-01), Hodgson
Feucht Peter
Hagen Uwe
Cohen Lee S.
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