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Method and apparatus for calibrating internal measurements of an implanted cardiac pacer

  • US 4,712,179 A
  • Filed: 02/05/1987
  • Issued: 12/08/1987
  • Est. Priority Date: 08/15/1984
  • Status: Expired due to Term
First Claim
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1. A method of calibrating internal measurements obtained through plated resistors formed on an integrated circuit in an implanted cardiac pacer, comprising the steps of:

  • measuring uncorrected values through plated resistors by an internal measurement circuit relative to at least one of battery conditions and pulses from a pacing circuit;

    obtaining correct values during the manufacturing process by a precise external instrument relative to at least one of the battery conditions and the pulses from the pacing circuit;

    comparing the uncorrected values with the correct values in order to provide correction factors;

    storing the correction factors for the uncorrected values in a memory device located within the implant;

    telemetering uncorrected values and the correction factors to an external programmer/receiver;

    computing corrected values in the external programmer/receiver from the telemetered uncorrected values and the telemetered correction factors in order to compensate effectively for the difference between the actual values of the resistors and the precise values of the resistors, so that the necessity of mechanically trimming the resistors to be of precise values after manufacturing is eliminated.

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