Patent US3219187A successfully refreshed from Google Patents.
Patent US3780727A successfully refreshed from Google Patents.
US3780727A
Expired / Lapsed
US
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Cardiac pacer monitoring means with rate and pulse discrimination
Assignee: F Hoffmann La Roche AG
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Filing: 1972-02-25
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Granted: 1973-12-25
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Expires: 1992-02-25
Abstract
Abstract In a cardiac pacer monitoring system for use with pacer patients, apparatus for deriving reliable pacer trigger signals from electrocardiac activity including, processing the electrocardiac signal to exclude QRS and 60 Hz problems, integrating the processed signal to act as a threshold control, comparing the processed signal with the threshold and discriminating the comparator output with pulse width discriminator and repetition rate discriminator means.
Inventors
- 👤 E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:39
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706; A61B; A61B5/00; A61B5/24; A61B5/72; A61B5/7203; A61N1/365; A61N1/368
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
Apparatus for use with pacer patients, for deriving pacer signals from electrocardiac signals comprising: means for deriving and processing the electrocardiac signals to produce a filtered, absolute output signal; means for integrating said output signal; comparator means for comparing signal levels of the output of said integrating means with said processing means output, to produce a comparator output signal representative of pacer activity when the processing means output signal attains a predetermined relationship with respect to the integrating means output signal; pulse width discriminator means for rejecting comparator output signals lying outside a preselected pulse width range; and repetition rate discriminator means for rejecting comparator output signals which lie outside a preselected range of pulse rates.
Claim 2
Dependent Claim
116 words
Apparatus for use with pacer patients, for deriving pacer signals from electrocardiac signals comprising: means for deriving and processing the electrocardiac signals to produce a filtered, absolute output signal; means for integrating said output signal; comparator means for comparing signal levels of the output of said integrating means with said processing means output, to produce a comparator output signal representative of pacer activity when the processing means output signal attains a predetermined relationship with respect to the integrating means output signal; pulse width discriminator means for rejecting comparator output signals lying outside a preselected pulse width range; and repetition rate discriminator means for rejecting comparator output signals which lie outside a preselected range of pulse rates.
Claim 3
Dependent Claim
52 words
In a system according to claim 1 wherein said integrating means includes impedance means to provide a relatively short attack time and relatively long release time to depend from the signal level of a prior signal, to generate a threshold level which quickly adapts to the intensity of the derived pacer signals.
Claim 4
Dependent Claim
43 words
In a system according to claim 2 wherein said processing means includes filter means adapted to pass pacer signals in a range from approximately 100 to 500 Hz and means for providing full wave rectification of the signals passed by the filter means.
Claim 5
Dependent Claim
28 words
In a system according to claim 1 wherein said pulse rate discriminator means is provided with a comparator output pulse acceptance range of approximately 0.5 To 5 ms.
Claim 6
Dependent Claim
30 words
In a system according to claim 1 wherein said repetition rate discriminator means defines a rate acceptance window of approximately 48 to 120 beats per minute for accepting pacer signals.
Claim 7
Dependent Claim
55 words
In a system according to claim 1 wherein for monitoring cardiac pacers of the fixed type, said repetition rate discriminator means includes: first means for rejecting comparator output signals which lie above said preselected range of pulse rates; and second means for rejecting comparator output signals which lie below said preselected range of pulse rates.
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |