Abstract: Disclosed is an adapter assembly for accurately positioning a removable biosensor implanted in the cranium or skull cap. The assembly comprises an outer sleeve member insertable into a hole bored through the skull cap and an inner sleeve member coaxial with the outer sleeve. The sleeve members are constructed so as to permit slidable insertion and removal of the biosensor and to ensure accurate, tilt-free alignment thereof, thus enabling precise, error-free measurement.

Abstract: There has been described a pressure detector that comprises a cylindrical resonator cavity (21) with a front surface made as a diaphragm (23) and an oscillator (29). The frequency of the oscillator signal is a criterion for the pressure acting upon the diaphragm; the oscillator signal is wirelessly radiated (32) and can be processed with an adequate receiver with frequency meter or the like. The current is supplied via a built-in battery (31) or by wireless irradiation. For measuring the intracranial pressure, the pressure detector is implanted in the skull bone (11) by means of a special adapter sleeve (18).