Method and apparatus for detecting arrhythmias in a medical device
First Claim
1. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
- sensing cardiac signals from the plurality of electrodes;
determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector during a predetermined window;
determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector during the predetermined window;
generating a first pulse amplitude threshold in response to the first number of inflections and a second pulse amplitude threshold in response to the second number of inflections;
identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold;
identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold;
identifying the first sensing vector as being available for therapy delivery based, at least in part, on the first sensing vector being at least one of not noisy, and both noisy and shockable;
identifying the second sensing vector as being available for therapy delivery based, at least in part, on the second sensing vector being at least one of not noisy, and both noisy and shockable; and
delivering therapy based, at least in part, on at least one of the first sensing vector and the second sensing vector being identified as available for therapy delivery.
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Abstract
A method of detecting a cardiac event in a medical device that includes sensing cardiac signals from a plurality of electrodes forming a first sensing vector and a second sensing vector, determining inflections of the sensed cardiac signals, generating a pulse amplitude threshold in response to the determined inflections, determining whether the sensed cardiac signals are corrupted by noise in response to the determined inflections and the generated pulse amplitude threshold, and determining, in response to the sensed cardiac signals being corrupted by noise, whether the sensed cardiac signals are both corrupted by noise and shockable.
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Citations
21 Claims
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1. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector during a predetermined window; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector during the predetermined window; generating a first pulse amplitude threshold in response to the first number of inflections and a second pulse amplitude threshold in response to the second number of inflections; identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold; identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold; identifying the first sensing vector as being available for therapy delivery based, at least in part, on the first sensing vector being at least one of not noisy, and both noisy and shockable; identifying the second sensing vector as being available for therapy delivery based, at least in part, on the second sensing vector being at least one of not noisy, and both noisy and shockable; and delivering therapy based, at least in part, on at least one of the first sensing vector and the second sensing vector being identified as available for therapy delivery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector during a predetermined sensing window having a plurality of sub-segments; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector during the predetermined sensing window; generating a first pulse amplitude threshold in response to the first number of inflections and a second pulse amplitude threshold in response to the second number of inflections; determining an individual one of the plurality of sub-segments of the predetermined window sensed along the first sensing vector having a first maximum number of inflections; determining an individual one of the plurality of sub-segments of the predetermined window of sensed cardiac signals sensed along the second sensing vector having a second maximum number of inflections; comparing each of the first pulse amplitude threshold and the second pulse amplitude threshold to a pulse threshold to obtain a first pulse amplitude comparison and a second pulse amplitude comparison, respectively; and comparing each of the first maximum number of inflections and the second maximum number of inflections to a noise pulse number threshold to obtain a first maximum number comparison and a second maximum number comparison, respectively; identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first pulse amplitude comparison and the first maximum number comparison; identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second pulse amplitude comparison and the second maximum number comparison; identifying the first sensing vector as being available for therapy delivery based, at least in part, on the first sensing vector being at least one of not noisy, and both noisy and shockable;
identifying the second sensing vector as being available for therapy delivery based, at least in part, on the second vector being at least one of not noisy, and both noisy and shockable;delivering therapy based, at least in part, on at least one of the first sensing vector and the second sensing vector being identified as available for therapy delivery. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer readable medium having computer executable instructions for performing a method of detecting a cardiac event with a medical device comprising a plurality of electrodes forming a first sensing vector and a second sensing vector comprising:
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sensing cardiac signals from the plurality of electrodes; determining a first number of inflections of the sensed cardiac signals sensed along the first sensing vector during a predetermined window; determining a second number of inflections of the sensed cardiac signals sensed along the second sensing vector during the predetermined window; generating a first pulse amplitude threshold in response to the first number of inflections and a second pulse amplitude threshold in response to the second number of inflections; identifying the first sensing vector as one of noisy and not noisy based, at least in part, on the first number of inflections and the first pulse amplitude threshold; identifying the second sensing vector as one of noisy and not noisy based, at least in part, on the second number of inflections and the second pulse amplitude threshold; identifying the first sensing vector as being available for therapy delivery based, at least in part, on the first sensing vector being at least one of not noisy, and both noisy and shockable; identifying the second sensing vector as being available for therapy delivery based, at least in part, on the second sensing vector being at least one of not noisy, and both noisy and shockable; and delivering therapy based, at least in part, on at least one of the first sensing vector and the second sensing vector being identified as available for therapy delivery.
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Specification