Electrode consisting of at least three elements useful for a HF surgical instrument

Claim 1

Apparatus for performing electrosurgical procedures on the body of a patient, comprising: a high frequency electrosurgical generator; an active electrode coupled to said high frequency electrosurgical generator and adapted to make contact with a first portion of the body of said patient; a neutral electrode including at least three electrode elements arranged on a common flexible carrier, said carrier including a link on a portion of its periphery on which connecting wires are run coupling said electrode elements to said high frequency electrosurgical generator, said electrode elements being adapted to make secure surface contact with a portion of the body of said patient which is remote from said first portion of said body; and a safety monitor circuit coupled to said neutral electrode via said carrier link for using the electrode elements of said neutral electrode as sensors for monitoring the sufficiency of surface contact between said electrode elements and the body of said patient, wherein: for improving the operation of said neutral electrode as a sensor for said safety monitor circuit, at least a portion of each of said electrode elements has a uniformly-curved circumferential edge, said electrode elements are arranged so as to be symmetrically disposed with respect to an axis of symmetry of said carrier which extends perpendicularly from approximately the center of said carrier, and said electrode elements have equal surface areas and are arranged on said carrier so as to be displaced with respect to one another in a circumferential direction.