Patent ID: 7785268

Claim:
Implantable device for determining intracranial pressures, comprising: a rigid housing defining a housing interior; a thin biocompatible membrane closing off at least a portion of the housing interior; and a pressure measuring device arranged in the housing interior, the pressure measuring device being a microchip which comprises a pressure sensor for determining a value of a pressure transfer occurring through the membrane from an outside of the membrane inwards towards the housing interior, wherein: the value of the pressure transfer is telemetrically communicated via the pressure measuring device; a pressure-dependent movement of the membrane acts on the pressure measuring device via a transfer medium, the transfer medium comprises one of air or a special gas, the housing interior is filled with a gas-displacing filler material except for a provided volume of the transfer medium, the rigid housing has a closed fluid chamber which adjoins the membrane on the outside of the membrane and is connected to a supply conduit for fluid, the rigid housing has the shape of a shallow can with an upper measurement chamber receiving the microchip and the transfer medium and a lower region forming the fluid chamber, the membrane divides the housing interior into the measurement chamber and the fluid chamber, the supply conduit for fluid runs substantially perpendicular in relation to a lower boundary wall of the fluid chamber.