Multipart planar electrode for an HF-surgery device

US5114424A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Uwe Hagen · Forchheim, DE
• Peter Feucht · Teltow, DE

Key dates

• Filing date: Aug 27, 1990
• Grant date: May 19, 1992
• Expiry date: Aug 27, 2010

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B18/16
• WIPO field: Medical technology
• WIPO sector: Instruments

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.