Use of curvature based features for beat detection
First Claim
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1. A system, comprising:
- a sensing circuit to sense a cardiac signal;
a sampling circuit, coupled to the sensing circuit, to sample the cardiac signal on a continuous basis;
a feature analyzer, coupled to the sampling circuit, to generate a cardiac curvature signal based on the cardiac signal and detect cardiac signal features from the cardiac curvature signal based on predetermined detection criteria;
a counter, coupled to the feature analyzer, to count the cardiac signal features over a predetermined period of time; and
a comparator, coupled to the counter, to receive a first input representative of a number of the cardiac signal features counted over the predetermined period of time and compare that input to a second input representative of a predetermined threshold number, and to provide a depolarization indicating signal when the number of the cardiac signal features counted over the predetermined period of time exceeds the threshold number.
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Abstract
A cardiac rhythm management system includes a sensing circuit to sense a cardiac signal and a sensing processor to detect cardiac depolarizations (beats) by utilizing certain morphological context of the sensed cardiac signal. The sensing processor samples the sensed cardiac signal, computes curvatures from the sampled cardiac signal to generate a cardiac curvature signal corresponding to the cardiac signal, derives cardiac signal features reflecting morphologically significant points along the cardiac signal from the cardiac curvature signal, and detects cardiac depolarizations based on an analysis of the cardiac signals features.
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Citations
39 Claims
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1. A system, comprising:
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a sensing circuit to sense a cardiac signal;
a sampling circuit, coupled to the sensing circuit, to sample the cardiac signal on a continuous basis;
a feature analyzer, coupled to the sampling circuit, to generate a cardiac curvature signal based on the cardiac signal and detect cardiac signal features from the cardiac curvature signal based on predetermined detection criteria;
a counter, coupled to the feature analyzer, to count the cardiac signal features over a predetermined period of time; and
a comparator, coupled to the counter, to receive a first input representative of a number of the cardiac signal features counted over the predetermined period of time and compare that input to a second input representative of a predetermined threshold number, and to provide a depolarization indicating signal when the number of the cardiac signal features counted over the predetermined period of time exceeds the threshold number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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a sensing circuit to sense a cardiac signal;
a sampling circuit, coupled to the sensing circuit, to sample the cardiac signal on a continuous basis;
a feature analyzer, coupled to the sampling circuit, to generate a cardiac curvature signal based on the cardiac signal and detect cardiac signal features from the cardiac curvature signal based on predetermined detection criteria;
a metric generator, coupled the feature analyzer, to compute a metric based on one or more of the cardiac signal features; and
a metric comparator, coupled to the metric generator, to receive a first metric input representative of the metric and compare that input to a second metric input representative of a predetermined threshold, and to provide an output signal indicating whether a depolarization has been detected. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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sensing a cardiac signal;
computing curvatures based on the cardiac signal;
deriving cardiac signal features from the computed curvatures;
counting a number of the cardiac signal features over a predetermined period of time; and
determining that a depolarization has occurred when the number of the cardiac signal features counted over the predetermined period of time exceeds a predetermined threshold number. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A method comprising:
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sensing a cardiac signal;
deriving cardiac signal features;
generating a parameter set associated with each of the cardiac signal features;
computing a metric based on portions of the parameter sets associated with the cardiac signal features;
comparing the metric with a predetermined threshold; and
determining whether a depolarization has occurred based on an outcome of the comparing. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method, comprising:
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receiving a sensor signal;
computing a curvature signal corresponding to the sensor signal;
deriving signal features based on the curvature signal; and
determining whether a predetermined physiological event has occurred based on the signal features. - View Dependent Claims (37, 38, 39)
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Specification