Method and apparatus for discriminating cardiac signals in a medical device based on wavelet decomposition analysis
First Claim
1. A medical device, comprising:
- means for sensing cardiac signals;
a cardiac lead, the means for sensing cardiac signals being positioned, at least in part, with respect to the cardiac lead;
means for applying a wavelet function to the sensed cardiac signals to generate a wavelet transform from the sensed cardiac signals using dyadic wavelet decomposition;
means for generating a first wavelet representation from the wavelet transform, the first wavelet representation being responsive to highpass frequency content of the sensed cardiac signals;
means for generating a second wavelet representation from the wavelet transform, the second wavelet representation being responsive to lowpass frequency content of the sensed cardiac signals; and
means for determining a lead failure of the cardiac lead in response to the first wavelet representation and the second wavelet representation.
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Abstract
A method and device for detecting cardiac signals in a medical device that includes decomposing sensed cardiac signals using a wavelet function to form a corresponding wavelet transform, generating a first wavelet representation corresponding to the wavelet transform that is responsive to RR intervals of the sensed cardiac signals, generating a second wavelet representation that is not responsive to RR intervals associated with the sensed cardiac signals, and determining a device failure in response to the first wavelet representation and the second wavelet representation. The method and device may also include decomposing sensed cardiac signals using a wavelet function to form a corresponding wavelet transform, generating a wavelet representation that is not responsive to RR intervals of the sensed cardiac signals, determining RR intervals associated with the sensed cardiac signals, and determining a device failure in response to the first wavelet representation and the determined RR intervals.
21 Citations
21 Claims
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1. A medical device, comprising:
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means for sensing cardiac signals; a cardiac lead, the means for sensing cardiac signals being positioned, at least in part, with respect to the cardiac lead; means for applying a wavelet function to the sensed cardiac signals to generate a wavelet transform from the sensed cardiac signals using dyadic wavelet decomposition; means for generating a first wavelet representation from the wavelet transform, the first wavelet representation being responsive to highpass frequency content of the sensed cardiac signals; means for generating a second wavelet representation from the wavelet transform, the second wavelet representation being responsive to lowpass frequency content of the sensed cardiac signals; and means for determining a lead failure of the cardiac lead in response to the first wavelet representation and the second wavelet representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A medical device, comprising:
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means for sensing cardiac signals; a cardiac lead, the means for sensing being positioned, at least in part, with respect to the cardiac lead; means for applying a wavelet function to the sensed cardiac signals to generate a wavelet transform from the sensed cardiac signals using dyadic wavelet decomposition; means for generating a wavelet representation from the wavelet transform, the wavelet representation being responsive to lowpass frequency content of the sensed cardiac signals; means for determining RR intervals associated with the sensed cardiac signals; and means for determining a lead failure of the cardiac lead in response to the first wavelet representation and the determined RR intervals. - View Dependent Claims (10, 11, 12)
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13. A medical device for sensing a cardiac signal of a patient, comprising:
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a cardiac lead; an electrode positioned with respect to the cardiac lead and configured to sense the cardiac signal; a processor operatively coupled to the electrode and configured to; apply a dyadic wavelet function to the cardiac signal to obtain a wavelet transform comprised of a plurality of wavelet values; generate a low frequency wavelet representation from a plurality of lowpass wavelet values of the plurality of wavelet values of the wavelet transform; generate a high frequency wavelet representation from a plurality of highpass wavelet values of the plurality of wavelet values of the wavelet transform; and identify a lead fault in the cardiac lead based, at least in part, on the low frequency wavelet representation and the high frequency wavelet representation. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification