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System and method for determining remaining battery life for an implantable medical device

  • US 20030065366A1
  • Filed: 10/02/2001
  • Published: 04/03/2003
  • Est. Priority Date: 10/02/2001
  • Status: Active Grant
First Claim
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1. In an implantable medical device (IMD) that is powered by a battery exhibiting a characteristic voltage drop at any given current drain from a beginning-of-life battery voltage to an elective replacement indicator battery voltage, the IMD imposing a quiescent current drain on the battery and periodically imposes an episodic current drain on the battery in an energy consuming incident including one or more of delivery of a therapy through a therapy delivery channel or monitoring a physiologic condition through a monitoring channel, the quiescent and episodic current drain consuming battery energy that cumulatively causes battery voltage to drop, a method of estimating the remaining life of the battery until battery voltage drops to the elective replacement indicator battery voltage comprising the steps of:

  • periodically measuring battery voltage and averaging a plurality of battery voltage measurements to derive an average measured battery voltage;

    estimating the estimated past current drain of the IMD comprising an average of the sum of the quiescent current drain and the episodic current drain; and

    determining the estimated remaining longevity from the measured voltage and the estimated past current drain.

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