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Implantable medical device and power source depletion control therefor

  • US 4,390,020 A
  • Filed: 02/17/1983
  • Issued: 06/28/1983
  • Est. Priority Date: 02/17/1983
  • Status: Expired due to Term
First Claim
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1. A programmable medical device having programmable means responsive to externally applied programming signals for programming the operation of the medical device in one of a plurality of operating modes and operating rates comprising:

  • a depletable power source for powering said medical device;

    power source energy detecting means coupled to said power source for providing a first end-of-life signal at a first depletion level and a second end-of-life signal at a second depletion level lower than said first depletion level;

    first rate and mode switching means coupled to said programmable means and said detecting means and responsive to an externally applied testing signal for operating said medical device in a first predetermined mode and at the programmed rate when neither a first nor a second end-of-life signal is present;

    second rate and mode switching means coupled to said programmable means and said detecting means and responsive to said testing signal for operating said medical device in the first predetermined mode and at a first predetermined rate when said first end-of-life signal is present; and

    third rate and mode switching means coupled to said programmable means and said detecting means and responsive to said testing signal for operating said medical device in a second predetermined mode and rate when said second end-of-life signal is present.

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