Adapter assembly for use with a cranial biosensor

Claim 1

An adapter assembly for accurately positioning a removable biosensor in a circular hole bored through the skull, said adapter assembly comprising a tubular element having a radially outwardly extending peripheral flange and a plurality of downwardly depending spring-like legs, said legs formed as outwardly extending cams whereby when the body of the biosensor is slidably inserted in the tubular element the spring-like legs are urged into contact with the skull bone defined by the hole therein and the outwardly extending cams engage the periphery of the skull bone proximate the Dura, a sleeve element having an axial bore therethrough sized to slidably engage the flange of the tubular element and having an inwardly extending peripheral flange bearing on the lower portion of the tubular element and defining an annular space between said inwardly extending peripheral flange and the outwardly extending peripheral flange of the tubular element, and a spring element disposed in said annular space whereby when the tubular element is inserted into the sleeve element and the biosensor is inserted therein, the cams of the spring-like legs are assured of adequate anchorage to the skull bone.