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Method for monitoring end of life for battery

  • US 6,654,640 B2
  • Filed: 03/06/2002
  • Issued: 11/25/2003
  • Est. Priority Date: 09/15/1997
  • Status: Expired due to Fees
First Claim
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1. A pacemaker, including:

  • a battery power terminal for a pacemaker battery;

    a pacing supply storage (PSS) capacitor electrically connected to the battery power terminal;

    pacemaker control circuitry electrically connected to the battery power terminal and the PSS capacitor for controlling current flow from the battery power terminal to the PSS capacitor to charge the PSS capacitor; and

    charge time measurement (CTM) control circuitry electrically connected to the pacemaker control circuitry and adapted to;

    access a predetermined set of charge time measurement set-up parameters and a predetermined elective replacement time (ERT) charge time limit determined from a battery resistance ERT target that corresponds to a battery charge depletion target;

    determine a rate of charge storage in the PSS capacitor using the predetermined set of charge time measurement set-up parameters;

    compare the determined rate of charge storage in the PSS capacitor to the predetermined ERT charge time limit for the predetermined set of charge time measurement set-up parameters; and

    declare an ERT based on a number of comparisons between the determined rate of charge storage in the PSS capacitor and the ERT charge time limit, wherein the predetermined set of charge time measurement set-up parameters to be accessed by the CTM control circuitry include;

    a physician-programmed final voltage (VF) to end a charge time measurement for determining the rate of charge storage in the PSS capacitor; and

    an initial reference voltage (VI) to begin the charge time measurement for determining the rate of charge storage in the PSS capacitor, and wherein the pacemaker control circuitry includes a sensing and pacing control block to select a voltage level (Vd) to which the PSS capacitor is discharged prior to beginning the time measurement for determining the rate of charge storage in the PSS capacitor, Vd being less than VI.

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