US3769986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Body organ threshold analyzer
Assignee: ESB Inc
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Filing: 1971-05-05
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Granted: 1973-11-06
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Expires: 1991-05-05
Abstract
Abstract A current control device having particular application as a body organ threshold analyzer is described comprising pulse current selection means by which a desired output pulse current from a pulse generating means, such as a cardiac pacer, can be selected, pulse current control means by which the pulse current can be controlled, and a pulse current sensing and correcting means by which the pulse current is sensed and when deviations from the selected current occur, sends corrective signals to the current control means.
Inventors
- 👤 C Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:44
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706; A61N1/371; Y; Y10; Y10S; Y10S323/00; Y10S323/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
365 words
A threshold analyzer having an input terminal operably connectable to an implantable stimulating pulse generating means and an output terminal operably connectable to an implanted stimulating electrode which comprises: a. a variable resistor having a first terminal and a second terminal, the first terminal being connected to the input terminal of the threshold analyzer; b. a first NPN germanium transistor having a collector, an emitter and a base, the collector thereof being connected to the second terminal of the variable resistor and the emitter thereof being connected to the output terminal of the threshold analyzer; c. a second PNP silicon transistor having an emitter, a collector and a base, the emitter thereof being connected to the input terminal of the threshold analyzer; d. a first fixed resistor having a first terminal and a second terminal, the first terminal being connected to the collector of the second transistor and the second terminal thereof being connected to the output terminal of the threshold analyzer; e. a second fixed resistor having a first terminal and a second terminal, the first terminal thereof being connected to the base of the second transistor and the second terminal thereof being connected to the second terminal of the variable resistor; f. a third fixed resistor having a first terminal and a second terminal, the first terminal thereof being connected to the base of the first transistor and the second terminal thereof being connected to the output terminal of the threshold analyzer; g. a third PNP germanium transistor having an emitter, a collector and a base, the emitter thereof being connected to the collector of the first transistor, the collector thereof being connected to the base of the first transistor and the base of the third transistor being connected to the collector of the second transistor; h. a fourth fixed resistor having a first terminal and a second terminal, the first terminal being connected to the base of the third transistor; and i. a capacitor having a first terminal and a second terminal, the first terminal being connected to the second terminal of the fourth fixed resistor and the second terminal of the capacitor being connected to the base of the second transistor.
Claim 2
Dependent Claim
365 words
A threshold analyzer having an input terminal operably connectable to an implantable stimulating pulse generating means and an output terminal operably connectable to an implanted stimulating electrode which comprises: a. a variable resistor having a first terminal and a second terminal, the first terminal being connected to the input terminal of the threshold analyzer; b. a first NPN germanium transistor having a collector, an emitter and a base, the collector thereof being connected to the second terminal of the variable resistor and the emitter thereof being connected to the output terminal of the threshold analyzer; c. a second PNP silicon transistor having an emitter, a collector and a base, the emitter thereof being connected to the input terminal of the threshold analyzer; d. a first fixed resistor having a first terminal and a second terminal, the first terminal being connected to the collector of the second transistor and the second terminal thereof being connected to the output terminal of the threshold analyzer; e. a second fixed resistor having a first terminal and a second terminal, the first terminal thereof being connected to the base of the second transistor and the second terminal thereof being connected to the second terminal of the variable resistor; f. a third fixed resistor having a first terminal and a second terminal, the first terminal thereof being connected to the base of the first transistor and the second terminal thereof being connected to the output terminal of the threshold analyzer; g. a third PNP germanium transistor having an emitter, a collector and a base, the emitter thereof being connected to the collector of the first transistor, the collector thereof being connected to the base of the first transistor and the base of the third transistor being connected to the collector of the second transistor; h. a fourth fixed resistor having a first terminal and a second terminal, the first terminal being connected to the base of the third transistor; and i. a capacitor having a first terminal and a second terminal, the first terminal being connected to the second terminal of the fourth fixed resistor and the second terminal of the capacitor being connected to the base of the second transistor.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |