Claims
- 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.
- 2. 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 signal indicative of stroke volume;
- signal processing means coupled to said measuring means for determining heart rate values in response to said stroke volume measurement signal wherein said heart rate is defined as the V--V interval;
- means for comparing the value of said stroke volume measurement signal with the value of a set point for producing a stroke volume difference value;
- means for determining a heart rate difference value, from said stroke volume difference value wherein said heart rate value is defined as the V--V interval;
- 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 signal processing means for providing stimulation pulses to said heart at a frequency which is a function of said current heart rate value.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 06/362,903, now U.S. Pat. No. 4,686,987 filed Mar. 29, 1982, and entitled "BIOMEDICAL APPARATUS RESPONSIVE TO CHANGES IN STROKE VOLUME" which is a continuation-in-part application of now abandoned application Ser. No. 274,875, filed Jun. 18, 1981 and entitled "VARIABLE RATE PACER RESPONSIVE TO CHANGES IN STROKE VOLUME".
US Referenced Citations (1)
Number |
Name |
Date |
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4535774 |
Olson |
Aug 1985 |
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Continuations (1)
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Parent |
362903 |
Mar 1982 |
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Continuation in Parts (1)
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274875 |
Jun 1981 |
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