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Pacemaker battery impedance test circuit and method of operation

  • US 4,606,350 A
  • Filed: 11/28/1984
  • Issued: 08/19/1986
  • Est. Priority Date: 11/28/1984
  • Status: Expired due to Term
First Claim
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1. A test system for ascertaining the remaining life of the battery of an implantable medical device by determining its internal impedance;

  • said medical device including a battery, circuitry, and means for connecting said battery across said circuitry;

    the test system comprising test capacitor means;

    first switch means for disconnecting said battery from across said circuitry;

    second switch means for connecting said battery across said test capacitor means;

    means for operating both of said first and second switch means simultaneously;

    means for comparing the potential across said test capacitor means with a reference level; and

    means for measuring the time interval required for the potential across said test capacitor means to reach said reference level while said first and second switch means are operated simultaneously.

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