US3777762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pacemaker with continuously adjustable output amplitude
Assignee: Christian Rovsing AS
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Filing: 1971-01-08
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Granted: 1973-12-11
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Expires: 1991-01-08
Abstract
Abstract A pacemaker having an output control circuit which is adapted when activated to control the produced pace impulses in such a manner that the amplitude of each impulse is slightly less than that of the preceding impulse. The control circuit can be activated and deactivated from outside, either by suitable hospital equipment or manually by a surgeon. It permits the threshold value of the heart to be determined without surgical operation by ascertaining the smallest pace impulse that causes heart contraction.
Inventors
- 👤 L Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; H; H03; H03K; H03K3/00; H03K3/02; H03K3/53
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
An implantable device comprising pulse generator means for producing heart stimulating pacing pulses including amplitude means for setting the amplitude of the pacing pulses, electrode means for introducing the pacing pulses into a heart, and circuit means coupled to said pulse generator means which coacts with the amplitude means thereof to set the amplitude of the pacing pulses produced by said pulse generator means, said circuit means including self-contained control means which when activated will cause the circuit means to change automatically in a continuous manner the coaction with the amplitude means of the pulse generator means and switch means for external actuation while the device is implanted which in repose normally deactivates the control means under which circumstances the circuit means coacts with the amplitude means of the pulse generator means to set the amplitude of the pacing pulses to a fixed value, said switch means when actuated, activates the control circuit whereby the amplitude of the pacing pulses are automatically varied.
Claim 2
Dependent Claim
163 words
An implantable device comprising pulse generator means for producing heart stimulating pacing pulses including amplitude means for setting the amplitude of the pacing pulses, electrode means for introducing the pacing pulses into a heart, and circuit means coupled to said pulse generator means which coacts with the amplitude means thereof to set the amplitude of the pacing pulses produced by said pulse generator means, said circuit means including self-contained control means which when activated will cause the circuit means to change automatically in a continuous manner the coaction with the amplitude means of the pulse generator means and switch means for external actuation while the device is implanted which in repose normally deactivates the control means under which circumstances the circuit means coacts with the amplitude means of the pulse generator means to set the amplitude of the pacing pulses to a fixed value, said switch means when actuated, activates the control circuit whereby the amplitude of the pacing pulses are automatically varied.
Claim 3
Dependent Claim
21 words
An implantable device as defined in claim 1, wherein said switch means is a reed switch actuatable by a magnetic member.
Claim 4
Dependent Claim
30 words
An implantable device as defined in claim 1, whereby said switch means is an electronic switch means including a tuned high frequency circuit actuatable by a preselected high frequency generator.
Claim 5
Dependent Claim
36 words
An implantable device as defined in claim 1 whereby said switch means comprises a reed switch actuatable by a magnetic member in series with a tuned high frequency circuit actuatable by a preselected high frequency generator.
Claim 6
Dependent Claim
22 words
An implantable device as defined in claim 1 wherein said switch means is a piezoelectric crystal actuatable at a preselected ultrasonic frequency.
Claim 7
Dependent Claim
39 words
An implantable device as defined in claim 1 wherein said pulse generator means includes a condenser the discharge from which is fed to said electrode means and said amplitude means controls the amplitude to which the condenser is charged.
Claim 8
Dependent Claim
22 words
An implantable device as defined in claim 1 wherein said amplitude means includes a voltage follower device coacting with said circuit means.
Claim 9
Dependent Claim
18 words
An implantable device as defined in claim 7 whereiN said voltage follower device is a field effect transistor.
Claim 10
Dependent Claim
28 words
An implantable device as defined in claim 1 wherein said circuit means includes a condenser and resistor in series with the junction therebetween connected to said amplitude means.
Claim 11
Dependent Claim
29 words
An implantable device as defined in claim 9 wherein said switch means in repose short circuits the condenser of said circuit means and when actuated relieves the short circuit.
References Cited (Backward Citations)
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US3195540A
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US3431912A
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US3517663A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |