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Cardiac pacemaker upper rate limit control

  • US 6,119,040 A
  • Filed: 06/29/1998
  • Issued: 09/12/2000
  • Est. Priority Date: 06/29/1998
  • Status: Expired due to Term
First Claim
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1. A rate adaptive cardiac pacemaker, implantable in a patient, comprising:

  • apparatus comprising a first sensor operative to sense a non-physiological parameter of the condition of the patient and to provide a first electric signal representative of the non-physiological parameter;

    apparatus comprising a second sensor operative to sense a physiological parameter of the condition of the patient and to provide a second electric signal representative of the physiological parameter;

    a pacing pulse signal generator;

    electrodes that receive the pacing pulse signals from the pulse generator and apply them to the heart of the patient for stimulating the heart;

    short term averaging circuitry that receives physiological signals representative of successive measures of physiological signals and averages them over a short term;

    long term averaging circuitry that receives physiological signals representative of successive measures of physiological signals and averages them over a term longer than said short term; and

    calculating circuitry that determines the ratio of the average of the measures of physiological signals over the short term to the average of the measures of physiological signals over the long term to produce a result that represents the rate of change of the physiological signals;

    apparatus comprising control circuitry that produces command signals that command the pulse generator to provide pacing pulse signals, that determines the rate of the pacing pulse signals so commanded based on information received from the first electric sensor signal, and that so determines the rate of the pacing pulse signals subject to upper rate limits selected based on information received from the calculating circuitry.

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