US4577634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for alleviating paroxysmal atrail tachycardia
Assignee: Individual
•
Filing: 1985-07-02
•
Granted: 1986-03-25
•
Expires: 2005-07-02
Abstract
Abstract An improved dual chamber cardiac pacing apparatus detects retrograde P-waves conduction by either determining polarity of the P-wave at a location in the right atrium adjacent the A-V node; or the sequence of signals which appear at this predetermined location and at a second predetermined location in the atrium in proximity to the sinus node. The pacing apparatus will ignore retrograde P-waves when initiating sequential pacing in the ventricle. In addition, the pacing apparatus will provide a burst of high rate atrial pacing pulses upon detection of the simultaneous occurrence of retrograde P-wave conduction, high rate heart beat and narrow QRS complexes.
Inventors
- 👤 Lawrence J. Gessman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/3621; A61N1/3622
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A method for alleviating paroxysmal atrial tachycardia in a human heart, said method comprising the steps of: a. detecting heart beat rates which exceed a predetermined level; b. detecting the presence of retrograde P-waves; and c. providing atrial pacing pulses in a predetermined format upon simultaneous occurrence of conditions detected in steps a and b.
Claim 2
Independent Claim
55 words
A method for alleviating paroxysmal atrial tachycardia in a human heart, said method comprising the steps of: a. detecting heart beat rates which exceed a predetermined level; b. detecting the presence of retrograde P-waves; and c. providing atrial pacing pulses in a predetermined format upon simultaneous occurrence of conditions detected in steps a and b.
Claim 3
Dependent Claim
53 words
A method in accordance with claim 1 further comprising the step of detecting QRS complexes having a duration which is less than a predetermined time and providing atrial pacing pulses in a predetermined format upon simultaneous occurrence of said QRS complexes and the conditions detected in steps a and b of claim 1.
Claim 4
Dependent Claim
23 words
A method in accordance with claim 1 wherein said predetermined format of atrial pacing pulses comprises at least one premature atrial pacing pulse.
Claim 5
Dependent Claim
24 words
A method in accordance with claim 1 wherein said predetermined format of atrial pacing pulses comprises a burst of high rate atrial pacing pulses.
Claim 6
Independent Claim
59 words
An apparatus for alleviating paroxysmal atrial tachycardia in a human heart, said apparatus comprising: a. means for detecting heart beat rates which exceed a predetermined level; b. means for detecting retrograde P-waves; and c. means for providing atrial pacing pulses in a predetermined format upon simultaneous detection of retrograde P-waves and heart beat rates which exceed said predetermined level.
Claim 7
Independent Claim
59 words
An apparatus for alleviating paroxysmal atrial tachycardia in a human heart, said apparatus comprising: a. means for detecting heart beat rates which exceed a predetermined level; b. means for detecting retrograde P-waves; and c. means for providing atrial pacing pulses in a predetermined format upon simultaneous detection of retrograde P-waves and heart beat rates which exceed said predetermined level.
Claim 8
Dependent Claim
64 words
An apparatus in accordance with claim 5 which additionally comprises means for detecting QRS complexes having a duration which is less than a predetermined time and means for providing atrial pacing pulses in a predetermined format upon simultaneous detection of retrograde P-waves, QRS complexes which have a duration of less than said predetermined time period, and heart beat rates which exceed said predetermined level.
Claim 9
Dependent Claim
18 words
An apparatus in accordance with claim 5 wherein said predetermined format comprises at least one premature atrial beat.
Claim 10
Dependent Claim
20 words
An apparatus in accordance with claim 5 wherein said predetermined format comprises a burst of high rate atrial pacing pulses.
References Cited (Backward Citations)
US3448739A
Cited
US3648707A
Cited
US3634924A
Cited
US3746003A
Cited
US3833004A
Cited
US3995623A
Cited
US4088140A
Cited
US4181133A
Cited
GB2026870A
Cited
US4307725A
Cited
US4421114A
Cited
US4329994A
Cited
US4329993A
Cited
US4328806A
Cited
US4384585A
Cited
US4412541A
Cited
US4452248A
Cited
US4427011A
Cited
US4539991A
Cited
US4515161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |