US4535774A
Expired / Lapsed
US
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Stroke volume controlled pacer
Assignee: Medtronic Inc
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Filing: 1983-06-30
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Granted: 1985-08-20
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Expires: 2003-06-30
Abstract
Abstract A rate responsive pacer which paces the heart at a rate dependent on detected variations in the stroke volume of the heart.
Inventors
- 👤 Walter H. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:33
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36521
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
189 words
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.
Claim 2
Dependent Claim
189 words
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.
Claim 3
Dependent Claim
158 words
A cardiac pacer for the therapeutic stimulation of a heart comprising: measuring means for periodically inferring the stroke volume of said heart and for roducing a sequence of stroke volume measurements; pulse generator means for providing stimulation pulses to said heart at a frequency proportional to a heart rate value wherein said heart rate value is defined as the V--V interval; means coupled to said measuring means and coupled to said pulse generator means for determining said heart rate value in response to stroke volume measurement; 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; and means for adding said heart rate difference value to the previous heart rate value yielding a current, heart rate value.
Claim 4
Dependent Claim
158 words
A cardiac pacer for the therapeutic stimulation of a heart comprising: measuring means for periodically inferring the stroke volume of said heart and for roducing a sequence of stroke volume measurements; pulse generator means for providing stimulation pulses to said heart at a frequency proportional to a heart rate value wherein said heart rate value is defined as the V--V interval; means coupled to said measuring means and coupled to said pulse generator means for determining said heart rate value in response to stroke volume measurement; 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; and means for adding said heart rate difference value to the previous heart rate value yielding a current, heart rate value.
Claim 5
Dependent Claim
173 words
A cardiac pacer for the therapeutic stimulation of a heart comprising: measuring means for measuring the ventricular volume of said heart at end diastole and at end systole and for inferring a stroke volume measurement from said end systolic and end diastolic measurements; pulse generator means for providing stimulation pulses to said heart at a frequency proportional to a heart rate value wherein said heart rate value is defined as the V--V interval; computational control means coupled to said measuring means and coupled to said pulse generator means for determining said heart rate value in response to the stroke volume measurement; 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; and means for adding said heart rate difference value to the previous heart rate value yielding a current, heart rate value.
Claim 6
Dependent Claim
173 words
A cardiac pacer for the therapeutic stimulation of a heart comprising: measuring means for measuring the ventricular volume of said heart at end diastole and at end systole and for inferring a stroke volume measurement from said end systolic and end diastolic measurements; pulse generator means for providing stimulation pulses to said heart at a frequency proportional to a heart rate value wherein said heart rate value is defined as the V--V interval; computational control means coupled to said measuring means and coupled to said pulse generator means for determining said heart rate value in response to the stroke volume measurement; 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; and means for adding said heart rate difference value to the previous heart rate value yielding a current, heart rate value.
Claim 7
Dependent Claim
34 words
The cardiac pacer of claim 1 or claim 2 or claim 3 wherein said computation and control means further includes: means for determining said stroke volume set point value from said heart rate value.
Claim 8
Independent Claim
99 words
A method of controlling the escape rate of a pacer comprising the steps of: (a) measuring the cardiac stroke volume; (b) comparing the measured stroke volume with a stroke volume set point value yielding a stroke volume variation value; (c) calculating a heart rate variation value from said stroke volume variation value; (d) adding said heart rate variation value to an existing value of heart rate yielding a heart rate summation value; (e) calculating an updated heart rate value from said heart rate summation value; and (f) setting said escape rate in response to said updated heart rate value.
Claim 9
Independent Claim
99 words
A method of controlling the escape rate of a pacer comprising the steps of: (a) measuring the cardiac stroke volume; (b) comparing the measured stroke volume with a stroke volume set point value yielding a stroke volume variation value; (c) calculating a heart rate variation value from said stroke volume variation value; (d) adding said heart rate variation value to an existing value of heart rate yielding a heart rate summation value; (e) calculating an updated heart rate value from said heart rate summation value; and (f) setting said escape rate in response to said updated heart rate value.
Claim 10
Independent Claim
112 words
A method of controlling the escape rate of a pacer comprising the steps of: (a) measuring the cardiac stroke volume; (b) comparing the measured stroke volume with a stroke volume set point value yielding a stroke volume variation value; (c) calculating a heart rate variation value from said stroke volume variation value; (d) adding said heart rate variation value to an existing value of heart rate yielding a heart rate, summation value; (e) calculating an updated heart rate value from said heart rate summation value; (f) setting said escape rate in response to said updated heart rate value; and (g) calculating a stroke volume set point value from said heart rate value.
Claim 11
Independent Claim
112 words
A method of controlling the escape rate of a pacer comprising the steps of: (a) measuring the cardiac stroke volume; (b) comparing the measured stroke volume with a stroke volume set point value yielding a stroke volume variation value; (c) calculating a heart rate variation value from said stroke volume variation value; (d) adding said heart rate variation value to an existing value of heart rate yielding a heart rate, summation value; (e) calculating an updated heart rate value from said heart rate summation value; (f) setting said escape rate in response to said updated heart rate value; and (g) calculating a stroke volume set point value from said heart rate value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |