US4523593A
Expired / Lapsed
US
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Constant A-A interval control for DVI and DDD cardiac pacemakers
Assignee: Medtronic Inc
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Filing: 1983-06-15
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Granted: 1985-06-18
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Expires: 2003-06-15
Abstract
Abstract A physiologic cardiac pacer operable in the DVI or A-V sequential pacing mode or the DDD or fully automatic pacing mode senses for the omission of an R-wave from an implantable cardiac pacer during the A-V interval. If the pacer does not sense a R-wave during the A-V interval the V-A interval is timed out immediately following the A-V interval and an atrial pacing pulse is issued at the end of the V-A interval. In the event, however, that an R-wave is sensed during the A-V interval, a flag is set and then the entire A-V interval is to be timed out, at which time the state of the flag is determined. If an R-wave was previously issued, a ventricular pacing pulse is not issued to the pacer at the end of the A-V interval, whereas if the flag is not set it is transmitted to the pacer.
Inventors
- 👤 John C. Rueter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/368
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
179 words
An implantable cardiac pacer operable in a DVI or DDD mode of pacing comprising: means for sensing an atrial pacing pulse or a P-wave pulse sensed from a patient; means for providing a predetermined atrial-ventricular timing interval; means for sensing the occurrence of an R-wave pulse from the patient; means for pacing the ventricular chamber of the patient in the absence of a sensed R-wave during the atrial-ventricular time interval; means for providing a predetermined ventricular-atrial timing interval immediately upon the termination of the atrial-ventricular timing interval; means for issuing an atrial pacing pulse at the end of the ventricular-atrial timing interval; means for determining if an R-wave was sensed during the atrial-ventricular timing interval; and means for inhibiting the generation of the ventricular pacing pulse until the end of the atrial-ventricular timing interval in the event that said R-wave was sensed during the atrial-ventricular interval, and for allowing said means for providing a predetermined atrial-ventricular timing interval to provide the entire atrial-ventricular timing interval regardless of whether or not an R-wave was sensed during said atrial-ventricular timing interval.
Claim 2
Dependent Claim
179 words
An implantable cardiac pacer operable in a DVI or DDD mode of pacing comprising: means for sensing an atrial pacing pulse or a P-wave pulse sensed from a patient; means for providing a predetermined atrial-ventricular timing interval; means for sensing the occurrence of an R-wave pulse from the patient; means for pacing the ventricular chamber of the patient in the absence of a sensed R-wave during the atrial-ventricular time interval; means for providing a predetermined ventricular-atrial timing interval immediately upon the termination of the atrial-ventricular timing interval; means for issuing an atrial pacing pulse at the end of the ventricular-atrial timing interval; means for determining if an R-wave was sensed during the atrial-ventricular timing interval; and means for inhibiting the generation of the ventricular pacing pulse until the end of the atrial-ventricular timing interval in the event that said R-wave was sensed during the atrial-ventricular interval, and for allowing said means for providing a predetermined atrial-ventricular timing interval to provide the entire atrial-ventricular timing interval regardless of whether or not an R-wave was sensed during said atrial-ventricular timing interval.
Claim 3
Dependent Claim
75 words
An implantable cardiac pacer operable in a DVI or DDD mode of pacing as claimed in claim 2 wherein said means for determining if an R-wave was sensed during the atrial-ventricular timing interval is a flag-setting means which sets a flag in the event that an R-wave was sensed during said atrial-ventricular timing interval, and said means for inhibiting the generation of the ventricular pacing pulse is responsive to said means for setting said flag.
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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |