US4384585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous intracardiac cardioverter
Assignee: Medtronic Inc
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Filing: 1981-03-06
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Granted: 1983-05-24
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Expires: 2001-03-06
Abstract
Abstract An implantable medical device to deliver cardioverting energy to cardiac tissue in synchrony with detected ventricular depolarizations. The energy renders refractory, areas of the heart associated with a reciprocating or automatic tachycardia, thus reverting these tachyarrhythmias to normal sinus rhythm without the risk of stimulating the heart during the vulnerable portion of repolarization.
Inventors
- 👤 Douglas P. Zipes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:38
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/3621; A61N1/38; A61N1/39; A61N1/3956; A61N1/3962; A61N1/39622; A61N1/3987
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
An implantable medical device for the electrical termination of tachyarrhythmia comprising: sensing means responsive to cardiac depolarizations for producing a sense signal indicative of naturally occurring cardiac activity; detection means responsive to said sensing means for detecting cardiac tachyarrhythmia for producing a tachyarrhythmia signal indicative of such tachyarrhythmia; pulse generator means responsive to a stimulus signal for delivering a cardioverting pulse to cardiac tissue in response to said stimulus signal; stimulus signal generating means responsive to said detection means for generating an output stimulus signal concurrent with each detected depolarization; and means for ensuring that the cardioverting pulse is delivered to cardiac tissue concurrent with a detected ventricular depolarization of the cardiac tissue.
Claim 2
Dependent Claim
113 words
An implantable medical device for the electrical termination of tachyarrhythmia comprising: sensing means responsive to cardiac depolarizations for producing a sense signal indicative of naturally occurring cardiac activity; detection means responsive to said sensing means for detecting cardiac tachyarrhythmia for producing a tachyarrhythmia signal indicative of such tachyarrhythmia; pulse generator means responsive to a stimulus signal for delivering a cardioverting pulse to cardiac tissue in response to said stimulus signal; stimulus signal generating means responsive to said detection means for generating an output stimulus signal concurrent with each detected depolarization; and means for ensuring that the cardioverting pulse is delivered to cardiac tissue concurrent with a detected ventricular depolarization of the cardiac tissue.
Claim 3
Dependent Claim
32 words
The device of claim 1 further including: a pulse generator responsive to said sensing means for producing a cardiac-stimulating pacing pulse if no cardiac depolarization is detected within a preset escape interval.
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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |