US3595242A
Expired / Lapsed
US
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Atrial and ventricular demand pacer
Assignee: American Optical Corp
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Filing: 1969-03-26
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Granted: 1971-07-27
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Expires: 1989-03-26
Abstract
Abstract An atrial and ventricular (bifocal) demand pacer. A device is disclosed for providing electrical stimulation to the atrium after a first predetermined time, and to the ventricle after a second predetermined time, where both predetermined times are measured from the last natural heartbeat. The pacer monitors the ventricular endocardial electrogram and programs both the atrial and the ventricular stimulation accordingly. In patients with atrial bradycardia but normal atrio-ventricular (AV) conduction, only the atria are stimulated. When the condition is complicated with AV block, both the atria and the ventricles are pacer controlled. The interval between the atrial and ventricular stimulation is selected to facilitate the proper atrioventricular timing sequence. The pacer does not compete with spontaneous ventricular contractions.
Inventors
- 👤 Barouh V Berkovits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:20
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/368
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
91 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, means for detecting the beating of said patient''s heart, means for generating an electrical stimulus on said atrial terminal means following a first predetermined time interval after the detection of the last beating of said patient''s heart, and means for generating an electrical stimulus on said ventricular terminal means following a second predetermined time interval after the detection of the last beating of said patient''s heart.
Claim 2
Dependent Claim
91 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, means for detecting the beating of said patient''s heart, means for generating an electrical stimulus on said atrial terminal means following a first predetermined time interval after the detection of the last beating of said patient''s heart, and means for generating an electrical stimulus on said ventricular terminal means following a second predetermined time interval after the detection of the last beating of said patient''s heart.
Claim 3
Dependent Claim
21 words
A pacer in accordance with claim 1 wherein said second predetermined time interval is longer than said first predetermined time interval.
Claim 4
Dependent Claim
50 words
A pacer in accordance with claim 2 wherein said first predetermined time interval iS shorter than the normal interval between successive R-waves in the electrocardiographic waveform of said patient and is longer than the normal interval between an R-wave and the next P-wave in the electrocardiographic waveform of said patient.
Claim 5
Dependent Claim
29 words
A pacer in accordance with claim 3 wherein said second predetermined time interval is longer than the normal interval between successive R-waves in the electrocardiographic waveform of said patient.
Claim 6
Dependent Claim
24 words
A pacer in accordance with claim 4 wherein said second predetermined time interval is longer than said first predetermined time interval by 160-250 milliseconds.
Claim 7
Dependent Claim
19 words
A pacer in accordance with claim 4 wherein said atrial and ventricular terminal means together include only three electrodes.
Claim 8
Dependent Claim
53 words
A pacer in accordance with claim 2 wherein said second predetermined time interval is longer than the normal interval between successive R-waves in the electrocardiographic waveform of said patient, and further including means for disabling the operation of said detecting means during the generation of an electrical stimulus on said atrial terminal means.
Claim 9
Dependent Claim
49 words
A pacer in accordance with claim 7 further including means for controlling said atrial and ventricular generating means to generate said respective electrical stimuli independent of the operation of said detecting means in the presence of noise which would otherwise be confused with the beating of said patient''s heart.
Claim 10
Dependent Claim
24 words
A pacer in accordance with claim 7 wherein said second predetermined time interval is longer than said first predetermined time interval by 160-250 milliseconds.
Claim 11
Dependent Claim
42 words
A pacer in accordance with claim 4 wherein said detecting means is connected to said ventricular terminal means, and further including means for disabling the operation of said detecting means during the generation of an electrical stimulus on said atrial terminal means.
Claim 12
Dependent Claim
18 words
A pacer in accordance with claim 2 wherein said detecting means is connected to said ventricular terminal means.
Claim 13
Dependent Claim
19 words
A pacer in accordance with claim 11 wherein said atrial and ventricular terminal means together include only three electrodes.
Claim 14
Dependent Claim
49 words
A pacer in accordance with claim 2 further including means for controlling said atrial and ventricular generating means to generate said respective electrical stimuli independent of the operation of said detecting means in the presence of noise which would otherwise be confused with the beating of said patient''s heart.
Claim 15
Dependent Claim
88 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, a first timing circuit including first means for generating an electrical impulse on said atrial terminal means, a second timing circuit including second means for generating an electrical impulse on said ventricular terminal means, means for detecting a beating action of said patient''s heart, and means responsive to the operation of said detecting means for resetting said first and said second timing circuits.
Claim 16
Dependent Claim
88 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, a first timing circuit including first means for generating an electrical impulse on said atrial terminal means, a second timing circuit including second means for generating an electrical impulse on said ventricular terminal means, means for detecting a beating action of said patient''s heart, and means responsive to the operation of said detecting means for resetting said first and said second timing circuits.
Claim 17
Dependent Claim
22 words
A pacer in accordance with claim 14 wherein said detecting means is operative to detect a ventricular contraction of said patient''s heart.
Claim 18
Dependent Claim
32 words
A pacer in accordance with claim 14 wherein the period of said first timing circuit is shorter than the normal interval between two successive R-waves in the electrocardiographic waveform of said patient.
Claim 19
Dependent Claim
35 words
A pacer in accordance with claim 16 wherein the period of said first timing circuit is longer than the normal interval between an R-wave and the next P-wave in the electrocardiographic waveform of said patient.
Claim 20
Dependent Claim
31 words
A pacer in accordance with claim 17 wherein the period of said second timing circuit is longer than the normal interval between successive R-waves in the electrocardiographic waveform of said patient.
Claim 21
Dependent Claim
31 words
A pacer in accordance with claim 16 wherein the period of said second timing circuit is longer than the normal interval between Successive R-waves in the electrocardiographic waveform of said patient.
Claim 22
Dependent Claim
31 words
A pacer in accordance with claim 14 wherein the period of said second timing circuit is longer than the normal interval between successive R-waves in the electrocardiographic waveform of said patient.
Claim 23
Dependent Claim
47 words
A pacer in accordance with claim 18 further including means for preventing the resetting of said first and second timing circuits responsive to the operation of said detecting means in the presence of noise which would otherwise be confused with a beating action of said patient''s heart.
Claim 24
Dependent Claim
45 words
A pacer in accordance with claim 14 further including means for preventing the resetting of said second timing circuit responsive to the operation of said detecting means in the presence of noise which would otherwise be confused with a beating action of said patient''s heart.
Claim 25
Dependent Claim
19 words
A pacer in accordance with claim 21 wherein said atrial and ventricular terminal means together include only three electrodes.
Claim 26
Dependent Claim
19 words
A pacer in accordance with claim 14 wherein said atrial and ventricular terminal means together include only three electrodes.
Claim 27
Dependent Claim
25 words
A pacer in accordance with claim 18 wherein the period of second timing circuit exceeds the period of said first timing circuit by 160-250 milliseconds.
Claim 28
Dependent Claim
127 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, means for detecting a beating action of said patient''s heart, means for applying an electrical impulse to said atrial terminal means following a first predetermined time interval after the detection of the last beating action of said patient''s heart, and means for applying an electrical impulse to said ventricular terminal means following a second predetermined time interval after the application of said electrical impulse to said atrial terminal means only in the absence of the detection of a beating action of said patient''s heart following the generation of said electrical impulse on said atrial terminal means during said second predetermined time interval.
Claim 29
Dependent Claim
127 words
A pacer comprising terminal means for connection to a patient''s heart for atrial stimulation, terminal means for connection to said patient''s heart for ventricular stimulation, means for detecting a beating action of said patient''s heart, means for applying an electrical impulse to said atrial terminal means following a first predetermined time interval after the detection of the last beating action of said patient''s heart, and means for applying an electrical impulse to said ventricular terminal means following a second predetermined time interval after the application of said electrical impulse to said atrial terminal means only in the absence of the detection of a beating action of said patient''s heart following the generation of said electrical impulse on said atrial terminal means during said second predetermined time interval.
Claim 30
Dependent Claim
46 words
A pacer in accordance with claim 26 wherein said detecting means is operative to detect a ventricular contraction of said patient''s heart, and further including means for disabling the operation of said detecting means during the application of an electrical impulse to said atrial terminal means.
Claim 31
Dependent Claim
33 words
A pacer in accordance with claim 27 wherein said first predetermined time interval is longer than the normal interval between an R-wave and the next P-wave in the electrocardiographic waveform of said patient.
Claim 32
Dependent Claim
55 words
A pacer in accordance with claim 28 wherein said first and second predetermined time intervals are within respective ranges such that with the proper beating of said patient''s heart an R-wave in said electrocardiographic waveform will occur between the termination of said first predetermined time interval and the termination of said second predetermined time interval.
Claim 33
Dependent Claim
41 words
A pacer in accordance with claim 26 wherein said first predetermined time interval is shorter than the normal interval between successive R-waves in the electrocardiographic waveform of said patient and said second predetermined time interval is longer than said normal interval.
Claim 34
Dependent Claim
33 words
A pacer in accordance with claim 30 wherein said first predetermined time interval is longer than the normal interval between an R-wave and the next P-wave in the electrocardiographic waveform of said patient.
Claim 35
Dependent Claim
54 words
A pacer comprising terminal means for connection to a patient''s heart for atrial and ventricular stimulation, means for detecting the beating of said patient''s heart, means controlled by the operation of said detecting means for generating electrical stimuli in a predetermined timing sequence on said terminal means for stimulating said atrium and said ventricle.
Claim 36
Dependent Claim
54 words
A pacer comprising terminal means for connection to a patient''s heart for atrial and ventricular stimulation, means for detecting the beating of said patient''s heart, means controlled by the operation of said detecting means for generating electrical stimuli in a predetermined timing sequence on said terminal means for stimulating said atrium and said ventricle.
Claim 37
Dependent Claim
27 words
A pacer as recited in claim 32, and wherein said detecting means includes means for preventing erroneous detection of an atrial contraction as an apparent ventricular contraction.
References Cited (Backward Citations)
US3241556A
Cited
US3433228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |