An implantable intracranial pressure (ICP) telemetry transmitter. Data transmission is accomplished by means of a radio frequency (RF) link coupled to a silicon piezoresistive pressure transducer. Electrostatic bonding of this transducer onto a tubular glass support provides long-term stability, stress...http://www.google.co.uk/patents/US4519401?utm_source=gb-gplus-sharePatent US4519401 - Pressure telemetry implant
