| abstract |
Implantable biomedical sensor device for measuring in vivo the presence and/or concentration of physiological substances, such as the concentration of glucose, in the human or animal body. A miniaturized electronic responder (3) arranged in a housing (2) of biocompatible material is exchanging binary coded information with a transmitter/receiver (20) and is provided with electrical connections, passing through the wall of the housing, which constitute an active electrode (10), a counter-electrode (8) and preferably, also a reference electrode (9) outside the housing. The active electrode (10) comprises a membrane (13) with hollow fibres extending transversely to the surface of the membrane and whose internal walls are coated with a conductive polymer containing a redox enzyme. One end of the hollow fibres is in electrical contact with a processing device (28) which converts the signals supplied by the active electrode to binary signals. |