US5480412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for deriving hemodynamic signals from a cardiac wall motion sensor
Assignee: Pacesetter Inc
•
Filing: 1993-11-16
•
Granted: 1996-01-02
•
Expires: 2013-11-16
Abstract
Abstract A processing system and method are provided for deriving an improved hemodynamic indicator from cardiac wall acceleration signals. The cardiac wall acceleration signals are provided by a cardiac wall motion sensor that responds to cardiac mechanical activity. The cardiac wall acceleration signals are integrated over time to derive cardiac wall velocity signals, which are further integrated over time to derive cardiac wall displacement signals. The cardiac wall displacement signals correlate to known hemodynamic indicators, and are shown to be strongly suggestive of hemodynamic performance. An implantable cardiac stimulating device which uses cardiac wall displacement signals to detect and discriminate cardiac arrhythmias is also provided.
Inventors
- 👤 Gabriel Mouchawar
- 👤 Kelly H. McClure
- 👤 Sheldon B. Moberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:16
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36542; A61N1/38; A61N1/39; A61N1/3956
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
84 words
An implantable cardiac stimulating device for providing therapeutic electrical stimulation to treat cardiac arrhythmias, the implantable cardiac stimulating device having a cardiac wall motion sensor associated therewith for providing a cardiac wall acceleration signal, the implantable cardiac stimulating device comprising: electrical stimulation generating circuitry for generating the therapeutic electrical stimulation; processing circuitry for deriving a hemodynamic signal representative of cardiac hemodynamic performance from the cardiac wall acceleration signal; and control circuitry for regulating the electrical stimulation generating circuitry in accordance with the hemodynamic signal.
Claim 2
Dependent Claim
84 words
An implantable cardiac stimulating device for providing therapeutic electrical stimulation to treat cardiac arrhythmias, the implantable cardiac stimulating device having a cardiac wall motion sensor associated therewith for providing a cardiac wall acceleration signal, the implantable cardiac stimulating device comprising: electrical stimulation generating circuitry for generating the therapeutic electrical stimulation; processing circuitry for deriving a hemodynamic signal representative of cardiac hemodynamic performance from the cardiac wall acceleration signal; and control circuitry for regulating the electrical stimulation generating circuitry in accordance with the hemodynamic signal.
Claim 3
Dependent Claim
29 words
The processing system of claim 1, wherein the hemodynamic signal representative of cardiac hemodynamic performance corresponds to one of contractility, sympathetic tone, blood flow, fluid displacement or stroke volume.
Claim 4
Dependent Claim
29 words
The implantable cardiac stimulating device of claim 1, wherein the processing circuitry comprises circuitry for deriving a signal representative of cardiac wall velocity from the cardiac wall acceleration signal.
Claim 5
Dependent Claim
31 words
The implantable cardiac stimulating device of claim 3, wherein the circuitry for deriving the signal representative of cardiac wall velocity comprises circuitry for integrating the cardiac wall acceleration signal over time.
Claim 6
Dependent Claim
29 words
The implantable cardiac stimulating device of claim 1, wherein the processing circuitry comprises circuitry for deriving a signal representative of cardiac wall displacement from the cardiac wall acceleration signal.
Claim 7
Dependent Claim
32 words
The implantable cardiac stimulating device of claim 5, wherein the circuitry for deriving the signal representative of cardiac wall displacement comprises circuitry for twice integrating the cardiac wall acceleration signal over time.
Claim 8
Dependent Claim
31 words
The implantable cardiac stimulating device of claim 5, wherein the processing circuitry further comprises circuitry for deriving a peak-to-peak cardiac wall displacement signal from the signal representative of cardiac wall displacement.
Claim 9
Dependent Claim
19 words
The implantable cardiac stimulating device of claim 1, wherein the processing circuitry and the control circuitry comprises a microprocessor.
Claim 10
Dependent Claim
39 words
The implantable cardiac stimulating device of claim 1, wherein the control circuitry evaluates the hemodynamic signal to detect cardiac arrhythmias and causes the electrical stimulation generating circuitry to generate the therapeutic electrical stimulation when a cardiac arrhythmia is detected.
Claim 11
Dependent Claim
36 words
The implantable cardiac stimulating device of claim 9, wherein the electrical stimulation generating circuitry comprises a pacing pulse generator for generating pacing pulses when the control circuitry detects an indication of bradycardia in the hemodynamic signal.
Claim 12
Dependent Claim
44 words
The implantable cardiac stimulating device of claim 9, wherein the electrical stimulation generating circuitry comprises a pacing pulse generator for generating pacing pulses in a sequence for interrupting tachycardia when the control circuitry detects an indication of hemodynamically stable tachycardia in the hemodynamic signal.
Claim 13
Dependent Claim
40 words
The implantable cardiac stimulating device of claim 9, wherein the electrical stimulation generating circuitry comprises a high energy shock generator for generating a cardioversion shock when the control circuitry detects an indication of hemodynamically unstable tachycardia in the hemodynamic signal.
Claim 14
Dependent Claim
38 words
The implantable cardiac stimulating device of claim 9, wherein the electrical stimulation generating circuitry comprises a high energy shock generator for generating a defibrillation shock when the control circuitry detects an indication of fibrillation in the hemodynamic signal.
Claim 15
Dependent Claim
57 words
The implantable cardiac stimulating device of claim 1, further comprising: means for sensing cardiac depolarization signals; means for detecting a decrease in the hemodynamic signal; means for defining a cardiac depolarization signal as an ectopic beat whenever a corresponding decrease in the hemodynamic signal is detected; and means for storing information related to the detected ectopic beats.
Claim 16
Independent Claim
56 words
A method of providing therapeutic electrical stimulation to treat cardiac arrhythmias, comprising the steps of: receiving a cardiac wall acceleration signal from a cardiac wall motion sensor; deriving a hemodynamic signal representative of cardiac hemodynamic performance from the cardiac wall acceleration signal; and regulating delivery of the therapeutic electrical stimulation in accordance with the hemodynamic signal.
Claim 17
Independent Claim
56 words
A method of providing therapeutic electrical stimulation to treat cardiac arrhythmias, comprising the steps of: receiving a cardiac wall acceleration signal from a cardiac wall motion sensor; deriving a hemodynamic signal representative of cardiac hemodynamic performance from the cardiac wall acceleration signal; and regulating delivery of the therapeutic electrical stimulation in accordance with the hemodynamic signal.
Claim 18
Dependent Claim
51 words
The method of claim 15, further comprising the steps of: sensing cardiac depolarization signals; detecting a decrease in the hemodynamic signal; defining a cardiac depolarization signal as an ectopic beat whenever a corresponding decrease in the hemodynamic signal is detected; and storing information related to the detected ectopic beats in memory.
Claim 19
Dependent Claim
31 words
The method of claim 15, wherein the step of deriving a hemodynamic signal comprises the step of deriving a signal representative of cardiac wall velocity from the cardiac wall acceleration signal.
Claim 20
Dependent Claim
29 words
The method of claim 17, wherein the step of deriving the signal representative of cardiac wall velocity comprises the step of integrating the cardiac wall acceleration signal over time.
Claim 21
Dependent Claim
31 words
The method of claim 15, wherein the step of deriving a hemodynamic signal comprises the step of deriving a signal representative of cardiac wall displacement from the cardiac wall acceleration signal.
Claim 22
Dependent Claim
30 words
The method of claim 19, wherein the step of deriving the signal representative of cardiac wall displacement comprises the step of twice integrating the cardiac wall acceleration signal over time.
Claim 23
Dependent Claim
33 words
The method of claim 19, wherein the step of deriving a hemodynamic signal further comprises the step of deriving a peak-to-peak cardiac wall displacement signal from the signal representative of cardiac wall displacement.
Claim 24
Dependent Claim
35 words
The method of claim 19, wherein the regulating step comprises the steps of: evaluating the hemodynamic signal to detect cardiac arrhythmias; and causing delivery of the therapeutic electrical stimulation when a cardiac arrhythmia is detected.
Claim 25
Dependent Claim
33 words
The method of claim 22, wherein the step of causing delivery of the therapeutic electrical stimulation comprises the step of causing delivery of pacing pulses when the hemodynamic signal is indicative of bradycardia.
Claim 26
Dependent Claim
41 words
The method of claim 22, wherein the step of causing delivery of the therapeutic electrical stimulation comprises the step of causing delivery of pacing pulses in a sequence for interrupting tachycardia when the hemodynamic signal is indicative of hemodynamically stable tachycardia.
Claim 27
Dependent Claim
36 words
The method of claim 22, wherein the step of causing delivery of the therapeutic electrical stimulation comprises the step of causing delivery of a cardioversion shock when the hemodynamic signal is indicative of hemodynamically unstable tachycardia.
Claim 28
Dependent Claim
34 words
The method of claim 22, wherein the step of causing delivery of the therapeutic electrical stimulation comprises the step of causing delivery of a defibrillation shock when the hemodynamic signal is indicative of fibrillation.
References Cited (Backward Citations)
US3815611A
Cited
US4140132A
Cited
EP0052162A1
Cited
US4428378A
Cited
US4802481A
Cited
US4708143A
Cited
US5014700A
Cited
US5031615A
Cited
US5044366A
Cited
US4774950A
Cited
US4967748A
Cited
US5156148A
Cited
US5040535A
Cited
US5040534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |