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US5025794A
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Method for analysis of electrocardiographic signal QRS complex
Assignee: ARRHYTHMIA RESEARCH TECHNOLOGY Inc
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Filing: 1988-08-30
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Granted: 1991-06-25
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Expires: 2008-08-30
Abstract
Abstract A method and apparatus for examining the QRS complex of ECG signals to detect minute late potentials. The system functions to filter the QRS signals bi-directionally, and further separately processes the two filtered signals through selected window functions before summation. The summed signal is then passed through a smoothing function to produce an output signal of ideal phase that delineates any late potentials within the QRS complex.
Inventors
- 👤 David E. Albert
- 👤 Edward J. Berbari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:18
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/366; A61B5/339; A61B5/72; A61B5/7235; A61B5/7253; A61B5/7257
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A method for determining anomalous late potentials in the QRS complex of an electrocardiographic beat signal, comprising: deriving the QRS signal of the beat signal as a series of digital sample values at a selected sample rate; filtering the QRS signal sample values through a digital filter of selected pass band; filtering the QRS signal sample values in reversed time order through a digital filter of said selected pass band; processing each of the filtered QRS signal in accordance with a predetermined window function and summing the resulting signal to produce a QRS summation signal; and smoothing the QRS summation signal to produce a QRS signal replica accentuating the non-random late potential signal components within the QRS low amplitude signal sector.
Claim 2
Independent Claim
121 words
A method for determining anomalous late potentials in the QRS complex of an electrocardiographic beat signal, comprising: deriving the QRS signal of the beat signal as a series of digital sample values at a selected sample rate; filtering the QRS signal sample values through a digital filter of selected pass band; filtering the QRS signal sample values in reversed time order through a digital filter of said selected pass band; processing each of the filtered QRS signal in accordance with a predetermined window function and summing the resulting signal to produce a QRS summation signal; and smoothing the QRS summation signal to produce a QRS signal replica accentuating the non-random late potential signal components within the QRS low amplitude signal sector.
Claim 3
Dependent Claim
24 words
A method as set forth in claim 1 wherein the steps of filtering each include: selecting a filter that is a low pass type.
Claim 4
Dependent Claim
23 words
A method as set forth in claim 1 wherein the steps of filtering each include: selecting a filter that is a highpass type.
Claim 5
Dependent Claim
25 words
A method as set forth in claim 1 wherein the steps of filtering each include: selecting a filter that is a fourth order Butterworth type.
Claim 6
Dependent Claim
32 words
A method as set forth in claim 4 wherein: said QRS signal is derived from a selected one of the X, Y and Z electrocardiographic responses and averaged over a selected duration.
Claim 7
Dependent Claim
16 words
A method as set forth in claim 1 wherein: said window function is a rectangular type.
Claim 8
Dependent Claim
16 words
A method as set forth in claim 1 wherein: said window function is a Blackman-Harris type.
Claim 9
Dependent Claim
16 words
A method as set forth in claim 1 wherein: said window function is a Hanning type.
Claim 10
Dependent Claim
16 words
A method as set forth in claim 1 wherein: said window function is a Hamming type.
Claim 11
Dependent Claim
32 words
A method as set forth in claim 1 wherein: said QRS signal is derived from a selected one of the X, Y and Z electrocardiographic responses and averaged over a selected duration.
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) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |