According to the invention, the long-term biocompatibility of the implant of an implantable device for the recording of intracranial pressures using a pressure measuring device cooperating with a sensor for a telemetric measured value transmission may be guaranteed, whereby the pressure measuring device is a microchip, said microchip is housed in a rigid housing and the pressure transmission from the outside to the inside is achieved by means of a thin biocompatible membrane, the pressure-dependent movement of which acts on the pressure measuring device via a transmission means.