US3902479A
Expired / Lapsed
US
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Method and apparatus for heartbeat rate monitoring
Assignee: F Hoffmann La Roche AG
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Filing: 1974-02-15
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Granted: 1975-09-02
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Expires: 1994-02-15
Abstract
Abstract A method and apparatus are disclosed for heartbeat rate monitoring and more particularly monitoring of cardiac rhythm, by analyzing an electrocardiographic signal. The invention provides the derivation of a signal representative of the width of the base of the R-wave of each QRS complex of the electrocardiographic signal by forming the quotient of the crestto-crest amplitude of the electrocardiographic signal by the crest-to-crest amplitude of the derivative of the electrocardiographic signal in relation to time. The amplitude of this derived signal is compared with an adjustable threshold value, wherein an output signal may be generated which is indicative of an abnormal QRS complex when the amplitude of the derived signal exceeds the threshold value.
Inventors
- 👤 Serge Georges Julien Chaumet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:57
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/366; A61B5/72; A61B5/7235; A61B5/7239
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
60 words
A method of monitoring cardiac rhythm by analyzing an electrocardiographic signal, comprising deriving a signal representative of the width of the base of the R-wave of each QRS complex of the electrocardiographic signal by forming the quotient of the crest-to-crest amplitude of the electrocardiographic signal by the crest-to-crest amplitude of the derivative of the electrocardiographic signal in relation to time.
Claim 2
Independent Claim
60 words
A method of monitoring cardiac rhythm by analyzing an electrocardiographic signal, comprising deriving a signal representative of the width of the base of the R-wave of each QRS complex of the electrocardiographic signal by forming the quotient of the crest-to-crest amplitude of the electrocardiographic signal by the crest-to-crest amplitude of the derivative of the electrocardiographic signal in relation to time.
Claim 3
Dependent Claim
18 words
A method according to claim 1 further comprising storing both crest-to-crest values prior to forming the quotient thereof.
Claim 4
Independent Claim
95 words
A method of monitoring cardiac rhythm by analyzing an electrocardiographic signal, comprising: deriving a signal representative of the width of the base of the R-wave of each QRS complex of the electrocardiographic signal by forming the quotient of the crest-to-crest amplitude of the electrocardiographic signal by the crest-to-crest amplitude of the derivative of the electrocardiographic signal in relation to time; and comparing the amplitude of the derived signal with an adjustable threshold value, and generating an output signal indicative of an abnormal QRS complex when the amplitude of the derived signal exceeds the threshold value.
Claim 5
Independent Claim
95 words
A method of monitoring cardiac rhythm by analyzing an electrocardiographic signal, comprising: deriving a signal representative of the width of the base of the R-wave of each QRS complex of the electrocardiographic signal by forming the quotient of the crest-to-crest amplitude of the electrocardiographic signal by the crest-to-crest amplitude of the derivative of the electrocardiographic signal in relation to time; and comparing the amplitude of the derived signal with an adjustable threshold value, and generating an output signal indicative of an abnormal QRS complex when the amplitude of the derived signal exceeds the threshold value.
Claim 6
Independent Claim
87 words
An apparatus for monitoring cardiac rhythm from an electrocardiographic signal comprising: means for determining the crest-to-crest value of the electrocardiographic signal for each QRS wave complex; means for determing the crest-to-crest value of a signal representative of the derivative of the electrocardiographic sigNal in relation to time for each QRS wave complex; and means for forming the quotient of the two determined values to provide an output signal representative of the width of the base of the R-wave of each QRS wave complex of the electrocardiographic signal.
Claim 7
Independent Claim
87 words
An apparatus for monitoring cardiac rhythm from an electrocardiographic signal comprising: means for determining the crest-to-crest value of the electrocardiographic signal for each QRS wave complex; means for determing the crest-to-crest value of a signal representative of the derivative of the electrocardiographic sigNal in relation to time for each QRS wave complex; and means for forming the quotient of the two determined values to provide an output signal representative of the width of the base of the R-wave of each QRS wave complex of the electrocardiographic signal.
Claim 8
Dependent Claim
40 words
An apparatus according to claim 4 further comprising: first storage means for storing the crest-to-crest value of the electrocardiographic signal; and second storage means for storing the crest-to-crest value of a signal representative of the derivative of the electrocardiographic signal.
Claim 9
Dependent Claim
37 words
An apparatus according to claim 5 wherein said first and second storage means include diode and capacitor circuits which are controlled by electronic switching means for performing read-out and resetting of said first and second storage means.
Claim 10
Dependent Claim
45 words
An apparatus according to claim 5 further comprising means for generating sampling pulses for controlling the operation of the quotient-forming means and zero-resetting of the storage means, each said sampling pulse being derived from a synchronous pulse of the R-wave of a QRS wave complex.
Claim 11
Dependent Claim
51 words
An apparatus according to claim 4 further comprising means for generating sampling pulses for controlling the operation of the quotient-forming means, each sampling pulse being derived from a synchronous pulse of the R-wave of a QRS wave complex and having a predetermined adjustable time lag in relation to said synchronous pulse.
Claim 12
Dependent Claim
66 words
An apparatus according to claim 4 wherein the means for determining the crest-to-crest value of the electrocardiographic signal comprises two parallel channels having a common input and outputs which are connected to an adding member, each of which channels includes storage means, and one of said channels further includes an inverter for inverting the electrocardiographic signal applied to the input terminal shared by the two channels.
Claim 13
Dependent Claim
31 words
An apparatus according to claim 9 wherein said storage means includes diode and capacitor circuits which are controlled by electronic switching means for performing read-out and resetting of the storage means.
Claim 14
Dependent Claim
71 words
An apparatus according to claim 4 wherein said means for determining the crest-to-crest value of the signal representative of the derivative of the electrocardiographic signal comprises two channels having a common input and whose outputs are connected to an adding member, each of which channels includes storage means, and one of said channels further includes an inverter for inverting the signals applied to the input terminals shared by the two channels.
Claim 15
Dependent Claim
25 words
An apparatus according to claim 4 further comprising means for comparing the output signal of the quotient-forming means with a threshold signal of adjustable value.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |