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US4955376A
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Pacemaker with improved automatic output regulation
Assignee: Telectronics NV
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Filing: 1989-08-07
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Granted: 1990-09-11
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Expires: 2009-08-07
Abstract
Abstract A pacemaker which is provided with an improved automatic regulation circuit which is capable of distinguishing between a fusion beat and loss of capture. The failure to sense an evoked potential following a stimulus may be due to either. The cause is determined by generating a high-energy back-up pulse shortly after the stimulus. Failure to capture by the back-up pulse is an indication that there was just a fusion beat; the sensing of an evoked potential is an indication that the stimulus failed to capture.
Inventors
- 👤 Francis J. Callaghan
- 👤 William Vollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/371; A61N1/3712; A61N1/365; A61N1/36507; A61N1/3706
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A pacemaker comprising means for generating pacing pulses; means for sensing an evoked potential in response to the generation of a pacing pulse; means responsive to the failure to sense an evoked potential following the generation of a pacing pulse for increasing the pacing rate so that if said failure was due to a fusion beat, then the next pacing pulse is more likely to result in heart capture; means for controlling the generation of a back-up pacing pulse responsive to the failure to sense an evoked potential; means responsive to the failure to sense an evoked potential following the generation of a back-up pacing pulse for determining that the preceding pacing pulse resulted in a fusion beat; and means responsive to the sensing of an evoked potential following the generation of a back-up pulse for determining that the preceding pacing pulse resulted in a heart capture failure.
Claim 2
Dependent Claim
148 words
A pacemaker comprising means for generating pacing pulses; means for sensing an evoked potential in response to the generation of a pacing pulse; means responsive to the failure to sense an evoked potential following the generation of a pacing pulse for increasing the pacing rate so that if said failure was due to a fusion beat, then the next pacing pulse is more likely to result in heart capture; means for controlling the generation of a back-up pacing pulse responsive to the failure to sense an evoked potential; means responsive to the failure to sense an evoked potential following the generation of a back-up pacing pulse for determining that the preceding pacing pulse resulted in a fusion beat; and means responsive to the sensing of an evoked potential following the generation of a back-up pulse for determining that the preceding pacing pulse resulted in a heart capture failure.
Claim 3
Dependent Claim
109 words
A pacemaker comprising means for generating pacing pulses; means for sensing an evoked potential in response to the generation of a pacing pulse; means responsive to the failure to sense an evoked potential following the generation of a pacing pulse for controlling the generation of a back-up pacing pulse; means responsive to the failure to sense an evoked potential following the generation of said back-up pacing pulse for determining that the preceding pacing pulse resulted in a fusion beat; and means responsive to the sensing of an evoked potential following the generation of a back-up pulse for determining that the preceding pacing pulse resulted in a heart capture failure.
Claim 4
Dependent Claim
109 words
A pacemaker comprising means for generating pacing pulses; means for sensing an evoked potential in response to the generation of a pacing pulse; means responsive to the failure to sense an evoked potential following the generation of a pacing pulse for controlling the generation of a back-up pacing pulse; means responsive to the failure to sense an evoked potential following the generation of said back-up pacing pulse for determining that the preceding pacing pulse resulted in a fusion beat; and means responsive to the sensing of an evoked potential following the generation of a back-up pulse for determining that the preceding pacing pulse resulted in a heart capture failure.
Claim 5
Dependent Claim
31 words
A pacemaker in accordance with claim 2 further including means responsive to the failure to sense an evoked potential following the generation of a pacing pulse for increasing the pacing rate.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |