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Stroke volume controlled pacer

  • US 4,535,774 A
  • Filed: 06/30/1983
  • Issued: 08/20/1985
  • Est. Priority Date: 06/30/1983
  • 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 a 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 difference 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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