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06/25/09 - USPTO Class 607 | 1 views | #20090163973 | Prev - Next | About this Page

Cardiac signal template generation using waveform clustering

Title: Cardiac signal template generation using waveform clustering

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20090163973, Cardiac signal template generation using waveform clustering.

What is claimed is:

1. A method of operating an implantable device to characterize a cardiac response to pacing, comprising: delivering pacing pulses to a heart sufficient in energy to effect capture; sensing cardiac signals respectively following delivery of the pacing pulses; extracting one more features from the cardiac signals; clustering the features to define a plurality of clusters; identifying one or more predominant clusters of the plurality of clusters and one or more less predominant clusters of the plurality of clusters; and forming a captured response template using the predominant clusters.

2. The method of claim 1, wherein the one or more features comprises one or more cardiac signal peaks.

3. The method of claim 1, wherein clustering the one or more features of the cardiac signals comprises clustering the one or more features in batch mode.

4. The method of claim 1, wherein clustering the one or more features of the cardiac signals comprises clustering the one or more features beat-by-beat.

5. The method of claim 1, wherein clustering the features comprises clustering each feature of a cardiac signal independently from clustering other features of the cardiac signal.

6. The method of claim 1, wherein forming the captured response template comprises forming one or more detection windows of the captured response template, each detection window having maximum and minimum time limits and maximum and minimum amplitude limits.

7. The method of claim 1, further comprising forming a fusion template using the one or more less predominant clusters.

8. The method of claim 1, further comprising forming an intrinsic activation template using the one or more less predominant clusters.

9. The method of claim 1, further comprising forming a noise template using the one or more less predominant clusters.

10. The method of claim 1, wherein at least one of the predominant clusters used to form the captured response template includes features extracted from cardiac signals of fusion beats.

11. The method of claim 1, wherein clustering the features comprises clustering the features using one or both of K-means clustering and a self-organizing map algorithm.

12. The method of claim 1, further comprising storing additional information related to one or more of pacing energy, pacing rate, and pacing interval with the captured response template.

13. The method of claim 1, wherein: forming the captured response template comprises determining detection windows based on the cardiac feature clusters; and further comprising adapting the detection windows to accommodate changes in a patient\'s cardiac waveform morphology.

14. The method of claim 13, wherein adapting the detection windows comprises adapting the detection windows using features of a cardiac signal associated with a captured response.

15. The method of claim 13, wherein adapting the detection windows comprises changing at least maximum amplitude of a detection window.

16. A method of operating an implantable device to determine a template used to characterize a cardiac response to pacing, comprising: delivering pacing pulses to a heart sufficient in energy to effect capture; sensing cardiac signals respectively following delivery of the pacing pulses; extracting peak values from the cardiac signals; clustering the peak values to define a plurality of clusters; identifying one or more predominant clusters of the plurality of clusters and one or more less predominant clusters of the plurality of clusters; and forming a captured response template using the predominant clusters.

17. The method of claim 16, wherein: extracting the peak values comprises extracting positive peak values and negative peak values; clustering the peak values to define a plurality of clusters comprises: clustering the positive peak values to define a plurality of positive peak clusters; and clustering the negative peak values to define a plurality of negative peak clusters; identifying the one or more predominant clusters comprises: identifying one or more predominant positive peak clusters; and identifying one or more predominant negative peak clusters; and forming the captured response template comprises forming the captured response template using the one or more predominant positive peak clusters and the one or more predominant negative peak clusters.

18. The method of claim 17, wherein forming the captured response template comprises: forming a positive peak detection window using the positive peak clusters; and forming a negative peak detection window using the negative peak clusters.

19. The method of claim 18, wherein the positive peak detection window has a first shape and the negative peak detection window has a second shape, different from the first shape.

20. The method of claim 16, further comprising forming one or more of a fusion template, an intrinsic activation template, and a noise template using the one or more less predominant clusters.

Brief Patent Description - Full Patent Description - Patent Claims

Click on the above for other options relating to this Cardiac signal template generation using waveform clustering patent application.

Patent Applications in related categories:

20090299427 - Coronary vein dimensional sensor and fixation apparatus - A system and method for estimating a hemodynamic performance parameter value of a patient's heart. The system includes a pulse generator and a medical electrical lead implanted partially within a coronary vein of the heart. The lead includes at least one sensor located within the coronary vein configured to generate ...

20090299428 - Determination of hemodynamic intolerance of ventricular pacing - In some examples, this disclosure describes techniques for assessing hemodynamic intolerance of ventricular pacing. A method comprises sensing a parameter indicative of autonomic tone during a first period in which a medical device delivers ventricular pacing to a patient, sensing the parameter indicative of autonomic tone during a second period ...

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