Method and arrangement for determining a power supply state variable in an active medical implant

An arrangement for carrying out a method for determining a power supply state variable for the maintenance state of a battery or a rechargeable battery in a medical implant, wherein the power supply is subjected to a predetermined load, and measurement values of an output voltage thereof are detected at multiple times during at least one time segment of a load phase, and either the measurement values are subjected to a comparison having a respective comparison value, and/or a chronological curve of the output voltage obtained from the measurement values is subjected to a comparison to at least one comparison curve, and wherein the comparison result is considered a characteristic for the power supply state variable, the arrangement comprising:

• a power supply controller for initiating and ending a load phase of a power supply of the implant at a predetermined load;
• a voltage measuring device for measuring measurement values of an output voltage of the power supply;
• a voltage measuring controller for the chronological controlling of the voltage measuring device such that measurement values are detected at predetermined times;
• a comparison memory for storing comparison values of the output voltage and/or a comparison time curve;
• and
• a comparison unit for (a) comparison of the measurement values obtained at certain times to respective comparison values, and/or (b) comparison of a chronological curve composed of the measurement values to the comparison time curve, and for obtaining an initial variable characterizing the comparison result, wherein the initial variable is considered a characteristic for the power supply state variable.