US3783878A
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US
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Atrial and ventricular pacer having independent rate and av delay controls
Assignee: American Optical Corp
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Filing: 1971-12-06
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Granted: 1974-01-08
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Expires: 1991-12-06
Abstract
Abstract There is disclosed an atrial and ventricular pacer having independent rate and AV delay controls. Adjustment of one potentiometer changes the basic pacer rate without affecting the AV delay; adjustment of another potentiometer varies the AV delay without affecting the pacer rate. This is achieved by having the rate control determine the atrial escape interval, a variable one-shot multivibrator being provided to delay the ventricular stimulus after it is triggered simultaneously with the generation of an atrial stimulus. The variable one-shot multivibrator is reset when a spontaneous ventricular beat is detected, and the atrial timing period always begins at the end of a fixed time interval following an atrial stimulus, the fixed time interval being longer than the maximum AV delay.
Inventors
- 👤 R Daynard
- 👤 S Thaler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:59
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/368
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A pacer comprising atrial terminal means, ventricular terminal means, first timing means for applying a pulse to said atrial terminal means at the end of a first time interval following the resetting thereof, means for varying said first time interval, second timing means for applying a pulse to said ventricular terminal means at the end of a second time interval following the application of a pulse to said atrial terminal means, means for adjusting said second time interval, means for detecting a ventricular beat of a patient''s heart and responsive thereto for inhibiting the application of a pulse to said ventricuLar terminal means if said second time interval has not expired subsequent to the application of the previous pulse to said atrial terminal means and for resetting said first timing means, and means for resetting said first timing means at the end of a third time interval following the application of a pulse to said atrial terminal means, said third time interval being longer than the maximum second time interval.
Claim 2
Dependent Claim
170 words
A pacer comprising atrial terminal means, ventricular terminal means, first timing means for applying a pulse to said atrial terminal means at the end of a first time interval following the resetting thereof, means for varying said first time interval, second timing means for applying a pulse to said ventricular terminal means at the end of a second time interval following the application of a pulse to said atrial terminal means, means for adjusting said second time interval, means for detecting a ventricular beat of a patient''s heart and responsive thereto for inhibiting the application of a pulse to said ventricuLar terminal means if said second time interval has not expired subsequent to the application of the previous pulse to said atrial terminal means and for resetting said first timing means, and means for resetting said first timing means at the end of a third time interval following the application of a pulse to said atrial terminal means, said third time interval being longer than the maximum second time interval.
Claim 3
Dependent Claim
27 words
A pacer in accordance with claim 1 wherein said second time interval is adjustable within minimum and maximum time intervals defining a normal range of AV delays.
Claim 4
Dependent Claim
204 words
A pacer comprising atrial terminal means, ventricular terminal means, means for generating atrial stimulating pulses on said atrial terminal means at spaced time intervals, means for generating a ventricular stimulating pulse on said ventricular terminal means at the end of a selected time interval following the generation of each stimulating pulse on said atrial terminal means, means for establishing the maximum value of said selected time interval to be less than a predetermined interval between the generation of said atrial stimulating pulse and the start of the next said spaced interval, means for detecting a spontaneous ventricular beat of a patient''s heart within said selected time interval following the generation of a stimulating pulse on said atrial terminal means but prior to the generation of a corresponding stimulating pulse on said ventricular terminal means for inhibiting the generation of said stimulating pulse on said ventricular terminal means, and means for controlling the time interval between a spontaneous ventricular beat and the generation of the next stimulating pulse on said atrial terminal means to be greater than the time interval between the generation of a stimulating pulse on said ventricular terminal means and the generation of the next stimulating pulse on said atrial terminal means.
Claim 5
Dependent Claim
204 words
A pacer comprising atrial terminal means, ventricular terminal means, means for generating atrial stimulating pulses on said atrial terminal means at spaced time intervals, means for generating a ventricular stimulating pulse on said ventricular terminal means at the end of a selected time interval following the generation of each stimulating pulse on said atrial terminal means, means for establishing the maximum value of said selected time interval to be less than a predetermined interval between the generation of said atrial stimulating pulse and the start of the next said spaced interval, means for detecting a spontaneous ventricular beat of a patient''s heart within said selected time interval following the generation of a stimulating pulse on said atrial terminal means but prior to the generation of a corresponding stimulating pulse on said ventricular terminal means for inhibiting the generation of said stimulating pulse on said ventricular terminal means, and means for controlling the time interval between a spontaneous ventricular beat and the generation of the next stimulating pulse on said atrial terminal means to be greater than the time interval between the generation of a stimulating pulse on said ventricular terminal means and the generation of the next stimulating pulse on said atrial terminal means.
Claim 6
Dependent Claim
67 words
A pacer in accordance with claim 3 wherein the time difference between the time interval separating a spontaneous ventricular beat and the next stimulating pulse on said atrial terminal means and the time interval separating a stimulating pulse on said ventricular terminal means and the next stimulating pulse on said atrial terminal means corresponds to the compensatory pause which follows a premature beat of said patient''s heart.
Claim 7
Dependent Claim
61 words
A pacer in accordance with claim 3 wherein said atrial stimulating pulse generating means includes another means for generating an atrial stimulating pulse at the end of another selected time interval following the detection of a spontaneous premature ventricular beat or following the lapse of a predetermined time interval after the generation of a previous atrial stimulating pulse, whichever occurred later.
Claim 8
Dependent Claim
35 words
A pacer in accordance with claim 5 further including a pair of means each for adjusting one and only one of a respective one of said selected time interval and said other selected time interval.
Claim 9
Dependent Claim
25 words
A pacer in accordance with claim 6 including means for establishing said predetermined time interval longer than the maximum value of said selected time interval.
References Cited (Backward Citations)
US3593718A
Cited
US3595242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |