Systems and methods for analysis and display of heart sounds

• US 7,806,833 B2
• Filed: 04/26/2007
• Issued: 10/05/2010
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: HD Medical, Inc.
• Original Assignee: HD Medical Group Limited
• Inventors: Thiagarajan, Arvind, Coffman, Damon J., Teo, Tat-Jin
• Primary Examiner(s): Layno; Carl H
• Assistant Examiner(s): Stice; Paula J
• Application Number:
  US11/740,906
• Publication Number:
  US 20090012415A1
• Time in Patent Office: 1,258 Days
• Field of Search: 600526-530
• US Class Current: 600/528
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 7/005 Detecting noise caused by implants, e.g. cardiac valves
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R
• CPC Class Codes: G16H 40/63 for local operation

Abstract

An auscultation system aids a clinician'"'"'s diagnosis of the heart sounds by visually displaying at least an S1 heart sound and an S2 heart sound, and ascertaining an onset of at least one of the heart sounds. A corresponding audio representation of the heart sounds can be provided to the clinician. The auscultation system includes a sensor for sensing heart sounds from at least one chest location of the patient and for transducing the heart sounds into electrical signals. The auscultation system also includes a signal processor for selectively filtering the electrical signals thereby highlighting frequency differences of the heart sounds, and further includes a video display for selectively displaying the selectively filtered electrical heart signals. In some embodiments, the auscultation system also displays calipers corresponding to the time domain and the frequency domain of the heart sounds, permitting the clinician to zoom in and out portions of the heart sounds of particular interest and also to take more accurate measurements of these portions of the heart sounds.

Claims

1. A method for displaying heart sounds of a patient, the method comprising:

sensing heart sounds from at least one chest location of the patient;

transducing the heart sounds into electrical signals;

selectively filtering the electrical signals thereby highlighting frequency differences of the heart sounds, and wherein the selectively filtered electrical heart signals corresponds to a choice of a bell mode and a diaphragm mode;

decomposing the bell mode or the diaphragm mode electrical signal into two component frequency ranges consisting of both a substantially lower frequency range and a substantially higher frequency range; and

separately displaying the substantially lower frequency range and the substantially higher frequency range of the decomposed bell or diaphragm mode.

2. The method of claim 1 wherein the selectively filtered electrical heart signals corresponds to a choice of at least one of a low frequency murmur, a medium frequency murmur and a high frequency murmur.

3. The method of claim 1 wherein the heart sounds include at least an S1 heart sound and an S2 heart sound, and wherein the method further comprising ascertaining an onset of at least one of the heart sounds.

4. The method of claim 1 further comprising recording audio annotations associated with the patient.

5. The method of claim 1 further comprising displaying a composite heart signal from the selectively filtered electrical heart signals.

6. The method of claim 1 wherein the displayed heart signals are bracketed by a pair of calipers.

7. The method of claim 6 wherein the pair of calipers correspond to a time domain.

8. The method of claim 7 further comprising zooming on the displayed heart signals with respect to the time domain.

9. The method of claim 6 wherein the pair of calipers correspond to a frequency domain.

10. The method of claim 9 further comprising zooming on the displayed heart signals with respect to the frequency domain.

11. The method of claim 6 wherein the audio annotations are transcribed using speech recognition, and wherein the textual transcriptions of the audio annotations are recorded.

12. An auscultation system useful in association with a patient, the system comprising:

a sensor configured to sense heart sounds from at least one chest location of the patient and to transduce the heart sounds into electrical signals;

a signal processor configured to selectively filter the electrical signals thereby highlighting frequency differences of the heart sounds, and wherein the selectively filtered electrical heart signals corresponds to a choice of a bell mode and a diaphragm mode;

the signal processor further configured to decompose the bell mode or the diaphragm mode electrical heart signal into two component frequency ranges consisting of both a substantially lower frequency range and a substantially higher frequency range; and

a display configured to selectively display separately the substantially lower frequency range and the substantially higher frequency range of the selectively filtered electrical heart signal.

13. The auscultation system of claim 12 wherein the selectively filtered electrical heart signals corresponds to a choice of at least one of a low frequency murmur, a medium frequency murmur and a high frequency murmur.

14. The auscultation system of claim 12 wherein the heart sounds include at least an S1 heart sound and an S2 heart sound, and wherein the signal processor is further configured to ascertain an onset of at least one of the heart sounds.

15. The auscultation system of claim 12 further comprising memory for recording audio annotations associated with the patient.

16. The auscultation system of claim 12 wherein the displayed heart signals are bracketed by a pair of calipers.

17. The auscultation system of claim 16 wherein the pair of calipers correspond to a time domain.

18. The auscultation system of claim 17 wherein the display is further configured to zoom on the displayed heart signals with respect to the time domain.

19. The auscultation system of claim 16 wherein the pair of calipers correspond to a frequency domain.

20. The auscultation system of claim 19 wherein the display is further configured to zooming with respect to the frequency domain.

21. The auscultation system of claim 16 wherein the audio annotations are transcribed using speech recognition, and wherein the textual transcriptions of the audio annotations are recorded.