Method and apparatus for discriminating cardiac signals in a medical device based on wavelet decomposition analysis
First Claim
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1. A method of detecting faults in a lead of an implantable medical device, an electrode being positioned with respect to the lead, comprising the steps of:
- sensing electrical signals with the electrode;
obtaining a signal function based on the electrical signal;
applying a wavelet transform function to the signal function to obtain a plurality of highpass wavelet values and a plurality of lowpass wavelet values associated with the signal function;
then applying a wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function to obtain a subsequent plurality of highpass wavelet values and a subsequent plurality of lowpass wavelet values associated with the signal function;
thenrepeating at least once the applying the wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function;
calculating a dispersion of the lowpass wavelet values; and
identifying a fault in the lead of the implantable medical device based, at least in part, on the dispersion of the lowpass wavelet values.
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Abstract
A method of detecting cardiac signals in a medical device that includes decomposing a cardiac signal using a wavelet function at a plurality of scales to form a corresponding wavelet transform, determining approximation coefficients in response to the plurality of scales, reconstructing a first wavelet representation of the wavelet transform using predetermined approximation coefficients of the determined approximation coefficients, and evaluating the detected cardiac signals in response to the reconstructing.
9 Citations
16 Claims
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1. A method of detecting faults in a lead of an implantable medical device, an electrode being positioned with respect to the lead, comprising the steps of:
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sensing electrical signals with the electrode; obtaining a signal function based on the electrical signal; applying a wavelet transform function to the signal function to obtain a plurality of highpass wavelet values and a plurality of lowpass wavelet values associated with the signal function;
then applying a wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function to obtain a subsequent plurality of highpass wavelet values and a subsequent plurality of lowpass wavelet values associated with the signal function;
thenrepeating at least once the applying the wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function; calculating a dispersion of the lowpass wavelet values; and
identifying a fault in the lead of the implantable medical device based, at least in part, on the dispersion of the lowpass wavelet values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting faults in a lead of an implantable medical device, an electrode being positioned with respect to the lead, comprising the steps of:
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sensing electrical signals with the electrode; obtaining a signal function based on the electrical signal; applying a wavelet transform function to the signal function to obtain a plurality of highpass wavelet values and a plurality of lowpass wavelet values associated with the signal function;
then applying a wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function to obtain a subsequent plurality of highpass wavelet values and a subsequent plurality of lowpass wavelet values associated with the signal function;
thenrepeating at least once the applying the wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function; creating a first wavelet representation of the signal function by combining at least one of the pluralities of lowpass wavelet values; and
identifying a fault in the lead of the implantable medical device based, at least in part, on the first wavelet representation. - View Dependent Claims (9, 10)
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- 11. The method of 8, wherein the wavelet transform function is a Haar wavelet transform function.
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13. A method of detecting faults in a lead of an implantable medical device, an electrode being positioned with respect to the lead, comprising:
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sensing electrical signals with the electrode; obtaining a signal function based on the electrical signal; applying a wavelet transform function to the signal function to obtain a plurality of highpass wavelet values and a plurality of lowpass wavelet values associated with the signal function;
then applying a wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function to obtain a subsequent plurality of highpass wavelet values and a subsequent plurality of lowpass wavelet values associated with the signal function;
thenrepeating at least once the applying the wavelet transform function to an immediately preceding plurality of lowpass wavelet values associated with the signal function; creating a first wavelet representation of the signal function by combining at least one of the pluralities of lowpass wavelet values; and
creating a second wavelet representation of the signal function by combining at least one of the pluralities of highpass wavelet values; andcalculating a first dispersion of the first wavelet representation and a second dispersion of the second wavelet representation; and identifying a fault in the lead of the implantable medical device based, at least in part, on the first dispersion and the second dispersion. - View Dependent Claims (14)
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- 15. The method of 13, wherein the wavelet transform function is a Haar wavelet transform function.
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