Electrode for recording bioelectrical properties

Claim 1

An electrode for attaching to the surface of a biological object to record biological properties thereof and comprising: housing means made of an insulating material and having a support surface for supporting said electrode on the surface of said biological object, and an internal cavity with internal walls, said internal cavity communicating exteriorly of said housing means through said supporting surface; a resilient membrane means for providing a resilient force and having outside edges, a central portion and annular undulations, between said central portion and said edges the outside edges of said membrane being fixedly attached to the internal walls of said cavity; a contact member means attached to the central portion of said resilient membrane means and having an initial position of operation in which it is caused to protrude from said support surface under the resilient force provided by said resilient membrane, said contact member means being movable in said internal cavity in a direction substantially perpendicular to said support surface, so that when said electrode is attached to the surface of said biological object, said contact member means moves inwardly of said cavity while being continuously urged to adopt said initial position, and means for connecting said electrode to an external device for recording biological properties.