HEART SOUND AND PULSE WAVEFORM ACQUISITION AND ANALYSIS

• US 20170020400A1
• Filed: 06/30/2016
• Published: 01/26/2017
• Est. Priority Date: 07/01/2015
• Status: Abandoned Application

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Rinderknecht, Derek, Gharib, Morteza, Pahlevan, Niema, Tavallali, Peyman
• Application Number:
  US15/199,160
• Publication Number:
  US 20170020400A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/0204 Acoustic sensors
• CPC Class Codes: A61B 2562/0223 Magnetic field sensors
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/6822 Neck
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 5/6833 Adhesive patches
• CPC Class Codes: A61B 7/00 Instruments for auscultation
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

Devices, systems, and methods are described for acquiring heart sound timing content to enhance pulse waveform analysis.

Claims

1. A band-based apparatus for heart sound and pulse waveform acquisition, the apparatus comprising:

an elongate band adapted to encircle a human body part;

a first sensor positioned along the band and adapted to measure heart sound; and

a second sensor different from the first sensor, wherein the second sensor is adapted to measure a pulse waveform.

2. The apparatus of claim 1, wherein the band is a wrist band and the second sensor is configured as a finger sensor and connected to the band by electrical leads.

3. The apparatus of claim 1, wherein the second sensor is also positioned along the band.

4. The apparatus of claim 3, further comprising at least one additional first sensor and at least one additional second sensor.

5. The apparatus of claim 4, further comprising an inward-facing bump adapted to stabilize position of the band.

6. The apparatus of claim 1, wherein the band is a finger band or a neck band.

7. The apparatus of claim 1, further comprising:

processing circuitry communicatively coupled with the first and second sensors; and

a non-transitory memory on which is stored a plurality of instructions that, when executed, cause the processing circuitry to determine a Dicrotic Notch timing position for the pulse waveform provided by the second sensor by superposition of the heart sound provided by the first sensor and the pulse waveform.

8. A patch-based apparatus for heart sound and pulse waveform acquisition, the apparatus comprising:

a body;

an adhesive region adapted to attach the body to a subject'"'"'s skin; and

at least one sensor adapted to acquire heart sound and a pulse waveform.

9. The apparatus of claim 8, wherein the sensor is an optical sensor.

10. The apparatus of claim 8, wherein the sensor is a magnetoresitive sensor.

11. The apparatus of claim 8, further comprising:

processing circuitry communicatively coupled with the at least one sensor; and

a non-transitory memory on which is stored a plurality of instructions that, when executed, cause the processing circuitry to determine a Dicrotic Notch timing position for the pulse waveform provided by the at least one sensor by superposition of the heart sound provided by the at least one sensor and the pulse waveform.

12. A method for heart sound and pulse waveform acquisition and analysis, the method comprising:

acquiring a pulse waveform at a first location;

acquiring heart sound at a second location; and

determining a Dicrotic Notch timing position for the pulse waveform by superposition of the pulse waveform and the heart sound.

13. The method of claim 12, wherein the first location is selected from a radial artery, brachial artery, a femoral artery, a carotid artery, chest wall and a photoplethysmograph location.

14. The method of claim 12, wherein the second location is selected from a radial artery, a brachial artery, a femoral artery, a carotid artery and chest wall.

15. The method of claim 14, wherein the first location is different from the second location.

16. The method of claim 12, further comprising:

acquiring a pulse waveform at a first location with at least one sensor;

acquiring heart sound at a second location with the at least one sensor; and

determining, with processing circuitry, a Dicrotic Notch timing position for the pulse waveform by superposition of the pulse waveform and the heart sound.

17. The method of claim 16, wherein the a first sensor is used to acquire the pulse waveform and a different, second sensor is used to acquire the heart sound.

18. The method of claim 12, performed with the apparatus described in claim 2.

19. The method of claim 12, performed with the apparatus described in claim 3.

20. The method of claim 12, performed with the apparatus described in claim 4.

21-23. -23. (canceled)