ELECTROCARDIOGRAM SIGNAL DETECTION
First Claim
1. A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a processor, that when executed by the processor, causes the processor to extract an electrocardiogram (ECG) signal from a signal by causing the processor to:
- identify putative QRS regions in a signal;
cross-correlate the putative QRS regions to determine correlated QRS regions of the signal; and
form a first ECG signal from the signal by filtering the correlated QRS regions of the signal using a first filtering regime and filtering a remainder of the signal outside of the correlated QRS regions using a second filtering regime that is different from the first filtering regime; and
present the first ECG signal.
1 Assignment
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Accused Products
Abstract
Apparatuses and methods for extracting, de-noising, and analyzing electrocardiogram signals. Any of the apparatuses described herein may be implemented as a (or as part of a) computerized system. For example, described herein are apparatuses and methods of using them or performing the methods, for extracting and/or de-noising ECG signals from a starting signal. Also described herein are apparatuses and methods for analyzing an ECG signal, for example, to generate one or more indicators or markers of cardiac fitness, including in particular indicators of atrial fibrillation. Described herein are apparatuses and method for determining if a patient is experiencing a cardiac event, such as an arrhythmia.
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Citations
47 Claims
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1. A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a processor, that when executed by the processor, causes the processor to extract an electrocardiogram (ECG) signal from a signal by causing the processor to:
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identify putative QRS regions in a signal; cross-correlate the putative QRS regions to determine correlated QRS regions of the signal; and form a first ECG signal from the signal by filtering the correlated QRS regions of the signal using a first filtering regime and filtering a remainder of the signal outside of the correlated QRS regions using a second filtering regime that is different from the first filtering regime; and present the first ECG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a processor, that when executed by the processor, causes the processor to extract an electrocardiogram (ECG) signal from a signal by causing the processor to:
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identify putative QRS regions in a signal; cross-correlate the putative QRS regions to determine correlated QRS regions of the signal; and form a first ECG signal from the signal by differentially filtering the correlated QRS regions of the signal relative to a remainder of the signal outside of the correlated QRS regions; identify putative R-R intervals in the first ECG signal; and cross-correlate the putative R-R intervals present the first ECG signal to determine correlated R-R intervals in the first ECG signal; and modify the first ECG signal by differentially filtering the correlated R-R intervals of the first ECG signal relative to a remainder of the signal outside of the correlated R-R intervals.
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27. A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a processor, that when executed by the processor, causes the processor to extract an electrocardiogram (ECG) signal from a signal by causing the processor to:
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identify a plurality of putative QRS regions in a signal; cross-correlate each of the putative QRS regions with each other to identify correlated QRS regions; forming a first ECG signal by; filtering a portion of the signal corresponding to the correlated QRS regions using a first filtering regime; and filter a second portion of the signal corresponding to a region of the signal excluding the correlated QRS regions with a second filtering regime that is different from the first filtering regime; identify putative R-R intervals in the first ECG signal; cross-correlate the putative R-R intervals to determine correlated R-R intervals; modify the first ECG signal by filtering only the portion of the first ECG signal corresponding to the correlated R-R intervals with a third filtering regime; and display the first ECG signal.
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28. A system for extracting ECG information from a signal, the system comprising:
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a QRS identifying module configured to receive an electrical signal and to identify a plurality of putative QRS regions in the signal; a QRS cross-correlator coupled to the QRS identifying module configured to cross-correlate each of the putative QRS regions with each other; a QRS filter module coupled to the QRS cross-correlator and configured to modify the signal by differentially filtering correlated QRS regions of signal relative to other regions of the signal; an R-R cross-correlator adapted to receive the modified signal from the QRS filter module and to cross-correlate putative R-R intervals in the modified signal with each other; and an R-R filter module coupled to the R-R cross-correlator and configured to further modify the modified signal by differentially filtering correlated R-R intervals relative to other regions of the modified signal. - View Dependent Claims (29, 30, 31)
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32. A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a processor, that when executed by the processor, causes the processor to determine if an electrocardiogram (ECG) signal is indicative of atrial fibrillation, by causing the processor to:
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identify putative QRS regions in a signal; cross-correlate the putative QRS regions to determine correlated QRS regions of the signal; and form a first ECG signal from the signal by differentially filtering the correlated QRS regions of the signal relative to a remainder of the signal outside of the correlated QRS regions; identify putative R-R intervals in the first ECG signal; and cross-correlate the putative R-R intervals present the first ECG signal to determine correlated R-R intervals in the first ECG signal; modify the first ECG signal by differentially filtering the correlated R-R intervals of the first ECG signal relative to a remainder of the signal outside of the correlated R-R intervals; and determine if the first ECG signal is indicative of atrial fibrillation. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A computer implemented method for extracting an electrocardiogram (ECG) signal from a signal comprising the steps of:
- identifying putative ECG sub-regions in a signal;
cross-correlating the putative sub-regions to determine correlated sub-regions of the signal; and
forming a first ECG signal from the signal by filtering the correlated sub-regions of the signal using a first filtering regime and optionally filtering a remainder of the signal outside of the correlated sub-regions using a second filtering regime that is different from the first filtering regime. - View Dependent Claims (46)
- identifying putative ECG sub-regions in a signal;
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43. A computer implemented method for extracting an electrocardiogram (ECG) signal from a signal comprising the steps of:
- identifying putative QRS regions in a signal;
cross-correlating the putative QRS regions to determine correlated QRS regions of the signal; and
forming a first ECG signal from the signal by filtering the correlated QRS regions of the signal using a first filtering regime and optionally filtering a remainder of the signal outside of the correlated QRS regions using a second filtering regime that is different from the first filtering regime.
- identifying putative QRS regions in a signal;
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44. A computer implemented method for extracting an electrocardiogram (ECG) signal from a signal comprising the steps of:
- identifying putative R-R intervals in the signal;
cross-correlating the putative R-R intervals present the signal to determine correlated R-R intervals in the signal;
forming a first ECG signal by differentially filtering the correlated R-R intervals of the first ECG signal relative to a remainder of the signal outside of the correlated R-R intervals. - View Dependent Claims (45)
- identifying putative R-R intervals in the signal;
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47. An electronic device for identifying atrial fibrillation configured to identify putative R-R intervals in the signal;
- cross-correlate the putative R-R intervals present the signal to determine correlated R-R intervals in the signal;
form a first ECG signal by differentially filtering the correlated R-R intervals of the first ECG signal relative to a remainder of the signal outside of the correlated R-R intervals, and provide an indication if the first ECG signal is indicative of atrial fibrillation.
- cross-correlate the putative R-R intervals present the signal to determine correlated R-R intervals in the signal;
Specification