US4730618A
Expired / Lapsed
US
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Cardiac pacer for pacing a human heart and pacing method
Assignee: Pacesetter AB
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Filing: 1986-06-16
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Granted: 1988-03-15
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Expires: 2006-06-16
Abstract
Abstract A cardiac pacer which generates pacing pulses at a predetermined pacing rate includes a device for making a body activity measurement. The measured body activity signal is non-linearly amplified such that signal portions having higher amplitudes are more amplified than signal portions having lower amplitudes. The non-linearly amplified body activity signal is integrated over a period of time. The predetermined pacing rate is varied dependent on the integrated signal.
Inventors
- 👤 Anders Lekholm
- 👤 David C. Amundson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36521; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A cardiac pacer for pacing a human heart in a patient comprising (a) means for generating pacing pulses at a predetermined pacing rate; (b) means for transmitting the pacing pulses to the heart for pacing; (c) means for making a body activity measurement of the patient; (d) means for obtaining a body activity signal depending on the body activity measurement, said signal varying according to the body activity level; (e) means for non-linearly amplifying all of the body activity signal such that signal portions having higher amplitudes are more amplified than signal portions having lower amplitudes; (f) means for integrating the non-linearly amplified body activity signal over a period of time; and (g) means for varying the predetermined pacing rate dependent on the integrated signal.
Claim 2
Dependent Claim
125 words
A cardiac pacer for pacing a human heart in a patient comprising (a) means for generating pacing pulses at a predetermined pacing rate; (b) means for transmitting the pacing pulses to the heart for pacing; (c) means for making a body activity measurement of the patient; (d) means for obtaining a body activity signal depending on the body activity measurement, said signal varying according to the body activity level; (e) means for non-linearly amplifying all of the body activity signal such that signal portions having higher amplitudes are more amplified than signal portions having lower amplitudes; (f) means for integrating the non-linearly amplified body activity signal over a period of time; and (g) means for varying the predetermined pacing rate dependent on the integrated signal.
Claim 3
Dependent Claim
26 words
A cardiac pacer as claimed in claim 1, wherein said means for non-linearly amplifying the body activity signal is means for squaring the body activity signal.
Claim 4
Dependent Claim
28 words
A cardiac pacer as claimed in claim 1, wherein said integrated means integrates said body activity signal over a time period in the range of 5 to 30s.
Claim 5
Dependent Claim
25 words
A cardiac paceer as claimed in claim 1, wherein said means for obtaining a body activity signal is a means for obtaining a respiratory signal.
Claim 6
Dependent Claim
24 words
A cardiac pacer as claimed in claim 4, wherein said means for making a body activity measurement means for making a body impedance measurement.
Claim 7
Independent Claim
122 words
A method for pacing a heart in a patient comprising the steps of: generating pacing pulses at a predetermined pacing rate; transmitting said pacing pulses to said heart for pacing thereof; making a measurement of selected body activity of said patient; generating a body activity signal in dependence upon said body activity measurement, said body activity signal varying according to the level of body activity of said patient; non-linearly amplifying all of said body activity signal by more greatly amplifying portions of said body activity signal having higher amplitudes than portions of said signal having lower amplitudes; integrating the non-linearly amplified body activity signal over a selected period of time; and varying said predetermined pacing rate in dependence on said integrated signal.
Claim 8
Independent Claim
122 words
A method for pacing a heart in a patient comprising the steps of: generating pacing pulses at a predetermined pacing rate; transmitting said pacing pulses to said heart for pacing thereof; making a measurement of selected body activity of said patient; generating a body activity signal in dependence upon said body activity measurement, said body activity signal varying according to the level of body activity of said patient; non-linearly amplifying all of said body activity signal by more greatly amplifying portions of said body activity signal having higher amplitudes than portions of said signal having lower amplitudes; integrating the non-linearly amplified body activity signal over a selected period of time; and varying said predetermined pacing rate in dependence on said integrated signal.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 6, wherein the step of non-linearly amplifying said body activity signal is further defined by squaring said body activity signal.
Claim 10
Dependent Claim
39 words
A method as claimed in claim 6, wherein the step of integrating the non-linearly amplified body activity signal is further defined by integrating said non-linearly amplified body activity signal for a period in the range of 5 to 30s.
Claim 11
Dependent Claim
35 words
A method as claimed in claim 6, wherein the step of making a measurement of the body activity of the patient is further defined by making a measurement of the respiratory activity of said patient.
Claim 12
Dependent Claim
31 words
A method as claimed in claim 9, wherein the step of making a respiratory activity measurement of said patient is further defined by making a body impedance measurement of said patient.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |