Implantable battery powered apparatus

摘要

The medical implant unit has several cells (1,2) connected in series. A first voltage tapping is provided, for the application of a first potential at the free anode of the battery and a second voltage tapping for the application of a second potential at the free cathode. The electrical user (6) for the supply with the entire voltage drop across the battery is connected respectively electrically conducting with the first and second voltage tappings. A third voltage tapping at the battery series circuit, is provided for the application of a reference potential and for supplying the measuring system (7) with a symmetrical voltage supply. A measurement circuit is provided at its measuring inputs connected with the first and the second voltage tappings, electrically conducting, for measuring the total battery voltage. It has a level converter and/or an adder. The measuring system (7) has a threshold value element (5) connected at the output of the measuring circuit (4), with at least one threshold value, for producing a battery condition signal. The circuit (4) and the threshold value element respectively have an input for a reference point, which is electrically connected with the third voltage tapping (3). The circuit (4) and the element (5), for the supply with a voltage symmetrical to the third voltage tapping are connected respectively with 1st and 2nd tappings.