Heart sound tracking system and method

• US 9,049,981 B2
• Filed: 12/07/2012
• Issued: 06/09/2015
• Est. Priority Date: 04/17/2007
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Patangay, Abhilash, Siejko, Krzysztof Z., Carlson, Gerrard M.
• Primary Examiner(s): Layno, Carl H
• Assistant Examiner(s): Morales, Jon Eric C
• Application Number:
  US13/708,196
• Publication Number:
  US 20130096451A1
• Time in Patent Office: 914 Days
• Field of Search: 600/513, 600/528, 600/529, 607/17
• US Class Current: 1/1
• CPC Class Codes: A61B 7/00 Instruments for auscultation
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R
• CPC Class Codes: A61N 1/3627 for treating a mechanical deficiency of the heart, e.g. congestive heart failure or cardiomyopathy
• CPC Class Codes: A61N 1/36514 controlled by a physiological quantity other than heart potential, e.g. blood pressure controlled by two or more physical parameters A61N1/36585
• CPC Class Codes: A61N 1/36521 the parameter being derived from measurement of an electrical impedance
• CPC Class Codes: A61N 1/36585 controlled by two or more physical parameters
• CPC Class Codes: A61N 1/368 comprising more than one electrode co-operating with different heart regions A61N1/3622, A61N1/3627 take precedence

Abstract

A system and method provide heart sound tracking, including an input circuit, configured to receive heart sound information, and a heart sound recognition circuit. The heart sound recognition circuit can be coupled to the input circuit and can be configured to recognize, within a particular heart sound of a particular heart sound waveform, a first intra heart sound energy indication and a corresponding first intra heart sound time indication using the heart sound information from the particular heart sound waveform and the heart sound information from at least one other heart sound waveform. The particular heart sound can include at least a portion of one of S1, S2, S3, and S4. Further, the first intra heart sound energy indication and the corresponding first intra heart sound time indication can correspond to the at least a portion of one of S1, S2, S3, and S4, respectively.

Claims

1. A system, comprising:

an input circuit configured to receive heart sound information; and

a heart sound recognition circuit, coupled to the input circuit, the heart sound recognition circuit configured to recognize, within a particular heart sound of a particular heart sound type, and within a particular heart sound waveform, a first intra heart sound energy indication and a corresponding first intra heart sound time indication using the heart sound information from the particular heart sound waveform and heart sound information from at least one other heart sound waveform;

a detection circuit configured to identify a candidate heart sound for the particular heart sound of the particular heart sound type using the heart sound information from the particular heart sound waveform or from the at least one other heart sound waveform; and

a cost analysis circuit configured to calculate a cost for the candidate heart sound, the cost including a jump penalty indicative of a temporal cost associated with the candidate heart sound;

wherein the heart sound recognition circuit is configured to recognize the first intra heart sound energy indication and the corresponding first intra heart sound time indication using the cost.

2. The system of claim 1, wherein the particular heart sound of the particular heart sound type includes at least a portion of one of S1, S2, S3, and S4;

and

wherein the first intra heart sound energy indication and the corresponding first intra heart sound time indication corresponds to the at least a portion of one of S1, S2, S3, and S4, respectively.

3. The system of claim 1, wherein the cost includes a local score indicative of a local benefit associated with the candidate heart sound.

4. The system of claim 1, wherein the heart sound recognition circuit is configured to determine a back pointer indicative of a pointer from the candidate heart sound to an optimal candidate heart sound using the cost.

5. The system of claim 1, wherein the particular heart sound of the particular heart sound type, and within the particular heart sound waveform includes an ensemble averaged heart sound over multiple physiological cycles.

6. A system, comprising:

an input circuit configured to receive heart sound information; and

a heart sound recognition circuit, coupled to the input circuit, the heart sound recognition circuit configured to recognize, within a particular heart sound of a particular heart sound type, and within a particular heart sound waveform, a first intra heart sound energy indication and a corresponding first intra heart sound time indication using the heart sound information from the particular heart sound waveform and heart sound information from at least one other heart sound waveform;

wherein the particular heart sound of the particular heart sound type includes at least a portion of one of S1, S2, S3, and S4;

wherein the first intra heart sound energy indication and the corresponding first intra heart sound time indication corresponds to the at least a portion of one of S1, S2, S3, and S4, respectively;

wherein the heart sound recognition circuit includes a detection circuit configured to detect a first candidate heart sound for the particular heart sound of the particular heart sound type using the heart sound information from the particular heart sound waveform and to detect a second candidate heart sound for the particular heart sound of the particular heart sound type using the heart sound information from the at least one other heart sound waveform; and

wherein the heart sound recognition circuit is configured to recognize the first intra heart sound energy indication and the corresponding first intra heart sound time indication using the first candidate heart sound and the second candidate heart sound.