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Method and apparatus for detecting amplitude loss in cardiac pacing pulses

  • US 5,713,931 A
  • Filed: 09/16/1996
  • Issued: 02/03/1998
  • Est. Priority Date: 09/16/1996
  • Status: Expired due to Term
First Claim
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1. An implantable cardiac stimulation apparatus comprising:

  • an implantable outer casing containinga battery;

    a pulse generator connected to said battery for producing pacing pulses, said pulse generator comprising a tank capacitor charged from said battery and a switch connected to said tank capacitor for controlling delivery of said pacing pulses;

    means for producing a reference voltage;

    a comparator, connected to said tank capacitor and said means for producing a reference voltage, said comparator comparing the voltage amplitude of said pacing pulses with said reference voltage; and

    a detector for indicating the state of said comparator at a selected time;

    a circuit coupled to said switch for enabling said detector as said switch is closed; and

    means for altering production of said pacing pulses by said pulse generator in response to said detector.

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