US3768486A
Expired / Lapsed
US
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Atrial and ventricular demand pacer having wide range atrial escape interval
Assignee: American Optical Corp
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Filing: 1972-03-09
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Granted: 1973-10-30
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Expires: 1992-03-09
Abstract
Abstract There is disclosed an atrial and ventricular demand pacer in which the atrial escape interval can be set to be less than 50 percent of the ventricular escape interval without multiple stimulations of the atria between ventricular beats. The atrial pulse generating circuit is triggered upon the occurrence of each ventricular beat, a single atrial stimulating pulse then being generated unless another ventricular beat is first detected within the atrial escape interval. Because an atrial stimulating pulse requires a trigger (ventricular beat), only one atrial stimulating pulse can be generated after each ventricular beat.
Inventors
- 👤 B Berkovits
- 👤 R Guillette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/368
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
243 words
An atrial and ventricular pacer comprising ventricular pulse generating means for generating a ventricular stimulating pulse for extension to a patient''s heart following the expiration of a ventricular escape timing interval, means for detecting a spontaneous ventricular beat of a patient''s heart or the generation of a ventricular stimulating pulse for synchronizing said ventricular pulse generating means to the beating action of the patient''s heart, timing means responsive to the operation of said detecting means for measuring an atrial escape timing interval, means for adjusting the width of said atrial escape timing interval, means responsive to the expiration of said atrial escape timing interval for generating one and only one atrial stimulating pulse for extension to a patient''s heart for each single operation of said detecting means and independent of the duration of said atrial escape timing interval, said timing means including a capacitor, first means for discharging said capacitor responsive to the operation of said detecting means, means for controlling the charging of said capacitor following the discharge thereof, second means conductively connected to said first discharging means and responsive to the voltage across said capacitor reaching a firing level for discharging said capacitor and controlling the operation of said atrial stimulating pulse generating means, and means for maintaining said second discharging means conducting to hold the voltage across said capacitor below said firing level, said second discharging means turning off only after said capacitor is discharged by said first discharging means.
Claim 2
Dependent Claim
243 words
An atrial and ventricular pacer comprising ventricular pulse generating means for generating a ventricular stimulating pulse for extension to a patient''s heart following the expiration of a ventricular escape timing interval, means for detecting a spontaneous ventricular beat of a patient''s heart or the generation of a ventricular stimulating pulse for synchronizing said ventricular pulse generating means to the beating action of the patient''s heart, timing means responsive to the operation of said detecting means for measuring an atrial escape timing interval, means for adjusting the width of said atrial escape timing interval, means responsive to the expiration of said atrial escape timing interval for generating one and only one atrial stimulating pulse for extension to a patient''s heart for each single operation of said detecting means and independent of the duration of said atrial escape timing interval, said timing means including a capacitor, first means for discharging said capacitor responsive to the operation of said detecting means, means for controlling the charging of said capacitor following the discharge thereof, second means conductively connected to said first discharging means and responsive to the voltage across said capacitor reaching a firing level for discharging said capacitor and controlling the operation of said atrial stimulating pulse generating means, and means for maintaining said second discharging means conducting to hold the voltage across said capacitor below said firing level, said second discharging means turning off only after said capacitor is discharged by said first discharging means.
Claim 3
Dependent Claim
47 words
An atrial and ventricular pacer in accordance with claim 1 wherein said ventricular pulse generating means includes means for adjusting the width of the respective escape timing interval, and each of said pulse generating means includes means for adjusting the width of the respective generated stimulating pulse.
Claim 4
Dependent Claim
217 words
An atrial and ventricular pacer comprising ventricular pulse generating means for generating ventricular stimulating pulses for extension to a patient''s heart, means for synchronizing said ventricular pulse generating means to the beating action of a patient''s heart, timing means for opErating in synchronism with the beating action of a patient''s heart for measuring an atrial escape timing interval, means for adjusting the width of said atrial escape timing interval, means responsive to the expiration of said atrial escape timing interval for generating at most one atrial stimulating pulse for extension to a patient''s heart for each venticular beating action of the patient''s heart independent of the duration of said atrial escape timing interval, said timing means including a capacitor, first means for discharging said capacitor responsive to a beating action of a patient''s heart, means for controlling the charging of said capacitor following the discharge thereof, second means conductively connected to said discharging means responsive to the voltage across said capacitor reaching a firing level for discharging said capacitor and controlling the operation of said atrial stimulating pulse generating means, and means for maintaining said second discharging means conducting to hold the voltage across said capacitor below said firing level, said second discharging means turning off only after said capacitor is discharging by said first discharging means.
Claim 5
Dependent Claim
217 words
An atrial and ventricular pacer comprising ventricular pulse generating means for generating ventricular stimulating pulses for extension to a patient''s heart, means for synchronizing said ventricular pulse generating means to the beating action of a patient''s heart, timing means for opErating in synchronism with the beating action of a patient''s heart for measuring an atrial escape timing interval, means for adjusting the width of said atrial escape timing interval, means responsive to the expiration of said atrial escape timing interval for generating at most one atrial stimulating pulse for extension to a patient''s heart for each venticular beating action of the patient''s heart independent of the duration of said atrial escape timing interval, said timing means including a capacitor, first means for discharging said capacitor responsive to a beating action of a patient''s heart, means for controlling the charging of said capacitor following the discharge thereof, second means conductively connected to said discharging means responsive to the voltage across said capacitor reaching a firing level for discharging said capacitor and controlling the operation of said atrial stimulating pulse generating means, and means for maintaining said second discharging means conducting to hold the voltage across said capacitor below said firing level, said second discharging means turning off only after said capacitor is discharging by said first discharging means.
Claim 6
Dependent Claim
37 words
An atrial and ventricular pacer in accordance with claim 3 wherein said atrial pulse generating means includes means for adjusting the width of the generated atrial stimulating pulse following the expiration of said atrial escape timing interval.
Claim 7
Dependent Claim
47 words
An atrial and ventricular pacer in accordance with claim 3 wherein said width adjusting means of said atrial escape timing interval is adjustable to produce an escape interval less than 50 percent of the time interval separating successive stimulating pulses generated by said ventricular pulse generating means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |