Patent US3198407A successfully refreshed from Google Patents.
Patent US5117833A successfully refreshed from Google Patents.
US5117833A
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Bi-spectral filtering of electrocardiogram signals to determine selected QRS potentials
Assignee: ARRHYTHMIA RESEARCH TECHNOLOGY Inc
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Filing: 1990-11-13
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Granted: 1992-06-02
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Expires: 2010-11-13
Abstract
Abstract Method and apparatus for analyzing electrocardiogram signals to ascertain any defects or abnormalities in heart activity. Sensed, orthogonal x, y and z input signals are processed to obtain QRS onset and then passed through first and second spectral filters having respective passbands of 70-200 hertz and 40-200 hertz in order to establish QRS offset and accurate determinations of RMS voltage values and (LAS) low amplitude signals in the terminal QRS portion of the ECG signal. A spectral filtering of the x, y and z input signals with 150-250 hertz bandpass window also allows determination of certain high frequency activity in the midportions of the QRS.
Inventors
- 👤 David E. Albert
- 👤 Paul Lander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:29
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/366; A61B5/72; A61B5/7235; A61B5/7253; A61B5/7257
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
137 words
A method for determining anomalous late potentials in an electrocardiogram signal, comprising: sensing orthogonal x, y and z electrocardiogram signals; deriving the first derivative value for each of said x, y and z signals; determining the spatial velocity vector from said first derivative x, y and z values; determining QRS onset for the electrocardiogram signal from the spatial velocity vector; spectral filtering each of the sensed x, y and z electrocardiogram signals using a first bandpass window to derive X, Y and Z filtered signals; generating the vector magnitude of said X, Y and Z filtered signals; determining QRS offset for the electrocardiogram signal using a selected one of the vector magnitude and X, Y and Z filtered signals; and indicating from said above-determined signals any anomalous late potentials in the QRS portion of the electrocardiogram signal.
Claim 2
Independent Claim
137 words
A method for determining anomalous late potentials in an electrocardiogram signal, comprising: sensing orthogonal x, y and z electrocardiogram signals; deriving the first derivative value for each of said x, y and z signals; determining the spatial velocity vector from said first derivative x, y and z values; determining QRS onset for the electrocardiogram signal from the spatial velocity vector; spectral filtering each of the sensed x, y and z electrocardiogram signals using a first bandpass window to derive X, Y and Z filtered signals; generating the vector magnitude of said X, Y and Z filtered signals; determining QRS offset for the electrocardiogram signal using a selected one of the vector magnitude and X, Y and Z filtered signals; and indicating from said above-determined signals any anomalous late potentials in the QRS portion of the electrocardiogram signal.
Claim 3
Dependent Claim
74 words
A method as set forth in claim 1 which is further characterized to include: spectral filtering each of the sensed x, y and z electrocardiogram signals using a selected second bandpass window to derive second X, Y and Z filtered signals; generating the vector magnitude of said second X, Y and Z filtered signals; and determining and indicating discrete RMS voltage values for a selected duration of the QRS portion of the electrocardiogram signal.
Claim 4
Dependent Claim
22 words
A method as set forth in claim 2 wherein: said second bandpass window is in the range from 40 to 200 hertz.
Claim 5
Dependent Claim
64 words
A method as set forth in claim 2 which is further characterized to include: spectral filtering each of the x, y and z electrocardiogram signals using a third bandpass window extending from 150 to 250 hertz to derive X, Y and Z high frequency filtered signals; and detecting and indicating high frequency activity in the middle of the QRS portion of the electrocardiogram signal.
Claim 6
Dependent Claim
22 words
A method as set forth in claim 4 wherein: said first bandpass window is in the range from 70 to 200 hertz.
Claim 7
Dependent Claim
22 words
A method as set forth in claim 5 wherein: said second bandpass window is in the range from 40 to 200 hertz.
Claim 8
Dependent Claim
22 words
A method as set forth in claim 4 wherein: said first bandpass window is in the range from 80 to 200 hertz.
Claim 9
Dependent Claim
22 words
A method as set forth in claim 7 wherein: said second bandpass window is in the range from 40 to 200 hertz.
Claim 10
Dependent Claim
21 words
A method as set forth in claim 1 wherein: said first bandpass window is the range from 70 to 200 hertz.
Claim 11
Dependent Claim
22 words
A method as set forth in claim 9 wherein: said second bandpass window is in the range from 40 to 200 hertz.
Claim 12
Dependent Claim
23 words
A method as set forth in claim 1 wherein: said first bandpass window is in the range of from 80 to 200 hertz.
Claim 13
Dependent Claim
23 words
A method as set forth in claim 11 wherein: said second bandpass window is in the range of from 40 to 200 hertz.
Claim 14
Dependent Claim
64 words
A method as set forth in claim 1 which is further characterized to include: spectral filtering each of the x, y and z electrocardiogram signals using a third bandpass window extending from 150 to 250 hertz to derive X, Y and Z high frequency filtered signals; and detecting and indicating high frequency activity in the middle of the QRS portion of the electrocardiogram signal.
Claim 15
Dependent Claim
21 words
A method as set forth in claim 13 wherein: said first bandpass window is the range from 70 to 200 hertz.
Claim 16
Dependent Claim
22 words
A method as set forth in claim 14 wherein: said second bandpass window is in the range from 40 to 200 hertz.
Claim 17
Dependent Claim
22 words
A method as set forth in claim 13 wherein: said first bandpass window is in the range from 80 to 200 hertz.
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) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |