Patent US3625201A successfully refreshed from Google Patents.
US3625201A
Expired / Lapsed
US
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Tester for standby cardiac pacing
Assignee: Telectronics NV
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Filing: 1969-11-28
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Granted: 1971-12-07
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Expires: 1989-11-28
Abstract
Abstract The tester disclosed herein facilitates the proper placement of the electrode of a standby cardiac pacer by attenuating both the stimulating pulses generated by the pacer and the spontaneous cardiac signals which either inhibit or trigger the operation of the pacer during standby operation. A nonlinear network is employed for providing different attenuating factors.
Inventors
- 👤 William P Murphy Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:26
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: first and second terminal means; and a nonlinear network connected between said first and second terminal means for differently attenuating said stimulating pulses and said spontaneous cardiac signals.
Claim 2
Dependent Claim
73 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: first and second terminal means; and a nonlinear network connected between said first and second terminal means for differently attenuating said stimulating pulses and said spontaneous cardiac signals.
Claim 3
Dependent Claim
114 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: first and second terminal means; and a nonlinear network connected between said first and second terminal means, said network including at least two resistors and circuit means including at least one diode for nonlinearly connecting said resistors between said first and second terminal means as a function of the potential between said input-output terminal and said lead thereby to differently attenuate said stimulating pulses and said spontaneous cardiac signals.
Claim 4
Dependent Claim
114 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: first and second terminal means; and a nonlinear network connected between said first and second terminal means, said network including at least two resistors and circuit means including at least one diode for nonlinearly connecting said resistors between said first and second terminal means as a function of the potential between said input-output terminal and said lead thereby to differently attenuate said stimulating pulses and said spontaneous cardiac signals.
Claim 5
Dependent Claim
41 words
A tester as set forth in claim 2 wherein one of said resistors is connected directly between said first and second terminal means and the other of said resistors is connected between said first and second terminal means through said diode.
Claim 6
Dependent Claim
37 words
A tester as set forth in claim 3 including a zener diode and a third resistor connected in series across said other resistor thereby to reduce the attenuation applied to stimulating pulses which exceed a predetermined level.
Claim 7
Dependent Claim
32 words
A tester as set forth in claim 2 wherein said network further comprises a zener diode interconnected with said resistors, for reducing the attenuation of stimulating pulses which exceed a predetermined level.
Claim 8
Dependent Claim
140 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: a first resistive attenuator for reducing the amplitude of spontaneous cardiac signals picked up by said lead prior to application to said terminal; a second resistive attenuator for reducing the amplitude of said stimulating pulses provided at said terminal prior to application to said lead; and circuit means including amplitude-responsive means interconnected with said resistors for nonlinearly connecting said attenuating means between said pacer and said lead as a function of the amplitude of the potential between said input-output terminal and said lead thereby to differently attenuate said stimulating pulses and said spontaneous cardiac signals.
Claim 9
Dependent Claim
140 words
A threshold tester for use between a cardiac lead and a cardiac pacer of the type which has a combined input-output terminal and which generates cardiac stimulating pulses at said terminal under the control of spontaneous cardiac signals received at said terminal, said tester comprising: a first resistive attenuator for reducing the amplitude of spontaneous cardiac signals picked up by said lead prior to application to said terminal; a second resistive attenuator for reducing the amplitude of said stimulating pulses provided at said terminal prior to application to said lead; and circuit means including amplitude-responsive means interconnected with said resistors for nonlinearly connecting said attenuating means between said pacer and said lead as a function of the amplitude of the potential between said input-output terminal and said lead thereby to differently attenuate said stimulating pulses and said spontaneous cardiac signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |