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Biomedical method and apparatus for controlling the administration of therapy to a patient in response to changes in physiological demand

  • US 5,190,035 A
  • Filed: 04/17/1986
  • Issued: 03/02/1993
  • Est. Priority Date: 06/18/1981
  • Status: Expired due to Term
First Claim
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1. A cardiac pacer for the therapeutic-stimulation of a heart comprising:

  • lead system means for coupling said pacer to the patient'"'"'s heart;

    measuring means coupled to said lead for inferring the stroke volume of said heart from the measurement of a physiologic parameter and for producing measurement indicative of stroke volume;

    computation and control means coupled to said measuring means for determining a heart rate value in response to said stroke volume measurements wherein said heart rate is defined as the V--V interval;

    means for comparing the value of said stroke volume measurement with the value of a stroke volume set point for producing a stroke volume difference value;

    means for determining a heart rate difference value, wherein said heart rate value is defined as the V--V interval, from said stroke volume difference value;

    means for adding said heart rate different value to the previous heart rate value yielding a current, heart rate value; and

    pulse generator means coupled to said lead system and said computational and control means for providing stimulation pulses to said heart at a frequency which is a function of said heart rate value.

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