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Method and apparatus for measuring lead impedance in an implantable cardiac rhythm management device

  • US 6,760,624 B2
  • Filed: 12/03/2001
  • Issued: 07/06/2004
  • Est. Priority Date: 12/03/2001
  • Status: Active Grant
First Claim
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1. A method for measuring lead impedance in an implantable cardiac rhythm management device, comprising the steps of:

  • (a) providing an implantable cardiac rhythm management device having a pulse generator with a switching converter type power supply for replenishing energy to a pacing supply capacitor following delivery of a stimulating pulse to cardiac tissue by way of an electrode on a lead coupled to the pulse generator and a microprocessor-based controller coupled in controlling relation to the pulse generator, said microprocessor comprising a counter;

    (b) counting a number of switching cycles required by the switching converter to replenish the energy delivered from the pacing supply capacitor in generating the stimulating pulse in said counter; and

    (c) determining the lead impedance as a function of the number of switching cycles of the switching converter needed to restore the amount of energy delivered from the pacing supply capacitor in generating a preceding stimulating pulse.

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