Pulse wave analysis device and recording medium

• US 9,044,145 B2
• Filed: 12/02/2011
• Issued: 06/02/2015
• Est. Priority Date: 10/30/2009
• Status: Active Grant

• Current Assignee: Fukuda Denshi Company Limited
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Mori, Naoki, Ogura, Toshihiko, Itonaga, Kazunobu, Takamatsu, Shozo
• Primary Examiner(s): Natnithithadha, Navin
• Assistant Examiner(s): WEARE, MEREDITH H
• Application Number:
  US13/310,421
• Publication Number:
  US 20120095353A1
• Time in Patent Office: 1,278 Days
• Field of Search: 600/490, 600500-509
• US Class Current: 1/1
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/02028 Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/0295 using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
• CPC Class Codes: A61B 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• CPC Class Codes: A61B 5/7242 using integration
• CPC Class Codes: G16H 20/30 relating to physical therapies or activities, e.g. physiotherapy, acupressure or exercising
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment

Abstract

A pulse wave analysis device stores a pulse waveform for multiple beats, and calculates a pulse wave analysis index by analyzing the pulse waveform. In the calculation of the pulse wave analysis index, pulse waveform shapes of each beat that constitute the pulse waveform for multiple beats are integrated, and beats for which a degree of approximation between the integrated pulse waveform shape and the pulse waveform shape of the beat is low are excluded as targets of calculation of the pulse wave analysis index.

Claims

1. A pulse wave analysis device comprising:

a storage unit for storing a pulse waveform for a plurality of beats;

an analysis processing unit configured to;

(1) integrate pulse waveform shapes of each beat that constitute the pulse waveform for the plurality of beats by combining the plurality of beats so as to obtain an integrated pulse waveform shape,

(2) determine a degree of approximation between the integrated pulse waveform shape and each of the plurality of beats,

(3) calculate a pulse wave analysis index for the plurality of beats after excluding, as a calculation target, a beat for which the degree of approximation between the integrated pulse waveform shape and the pulse waveform shape of the beat is low, and

(4) calculate a degree of stability of beating by integrating the degrees of approximation of each pulse waveform shape used in the calculation of the pulse wave analysis index; and

an output unit that outputs the calculated pulse wave analysis index as an analysis result and the degree of stability as an index indicating reliability of the pulse wave analysis index.

2. The pulse wave analysis device according to claim 1, wherein

the storage unit stores the pulse waveform for a plurality of beats for multiple extremities,

for each of the multiple extremities, the analysis processing unit integrates the pulse waveform shapes of each beat and calculates the degree of approximation, the pulse wave analysis index, and the degree of stability, and

the output unit outputs, as the analysis result, the pulse wave analysis index corresponding to an extremity for which the degree of stability is the highest.

3. The pulse wave analysis device according to claim 1, wherein

the storage unit stores the pulse waveform for a plurality of beats for a left extremity and a right extremity, and

the analysis processing unit calculates the degree of approximation for each extremity, and calculates the pulse wave analysis index using the pulse waveform shape of the extremity for which the degree of approximation is the highest.

4. The pulse wave analysis device according to claim 1, wherein in calculating the degree of approximation, the analysis processing unit limits the pulse waveform shapes of each beat to a range of the waveform shape that has influence on calculation of the pulse wave analysis index.

5. The pulse wave analysis device according to claim 1, wherein the pulse wave analysis index indicates a degree of arterial sclerosis and/or a degree of blood vessel stenosis.

6. The pulse wave analysis device according to claim 5, wherein the pulse wave analysis index includes a pulse wave velocity as an index indicating the degree of arterial sclerosis.

7. The pulse wave analysis device according to claim 1, further comprising:

a pulse wave detection unit configured to detect a pulse wave of an extremity, wherein the analysis processing unit calculates the pulse waveform for a plurality of beats based on a detection signal from the pulse wave detection unit.

8. A non-transitory computer-readable medium having recorded thereon a pulse wave analysis program for causing a computer to function as a device for analyzing a pulse wave, the pulse wave analysis program causing the computer to execute the steps of:

integrating pulse waveform shapes of each beat that constitute a pulse waveform for a plurality of beats that are stored in a storage unit by combining the plurality of beats, so as to obtain an integrated pulse waveform shape;

determining a degree of approximation between the integrated pulse waveform shape and each of the plurality of beats;

calculating a pulse wave analysis index for the plurality of beats after excluding, as a calculation target, a beat for which the degree of approximation between the integrated pulse waveform shape and the pulse waveform shape of the beat is low;

calculating a degree of stability of beating by integrating the degrees of approximation of each pulse waveform shape used in the calculation of the pulse wave analysis index; and

outputting the calculated pulse wave analysis index as an analysis result and the degree of stability as an index indicating reliability of the pulse wave analysis.