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Implantable battery monitoring means and method

  • US 4,345,603 A
  • Filed: 02/19/1980
  • Issued: 08/24/1982
  • Est. Priority Date: 02/19/1980
  • Status: Expired due to Term
First Claim
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1. In combination:

  • an implantable device having a battery contained therein;

    a load means for drawing current from said battery;

    first means for providing a first voltage related to the output voltage of said battery;

    second means for periodically applying said load means to said battery, thereby generating a second voltage related to said loaded battery output voltage;

    comparison means responsive to said first and second voltages for generating an output signal having a predetermined characteristic when said first and second voltages have a predetermined relationship with respect to each other, said output signal being related to the internal impedance of said battery; and

    third means responsive to said output signal for indicating that said predetermined characteristic is present.

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