BLOOD PRESSURE MEASUREMENT DEVICE, ELECTRONIC DEVICE, AND BLOOD PRESSURE MEASUREMENT METHOD

• US 20160174854A1
• Filed: 12/04/2015
• Published: 06/23/2016
• Est. Priority Date: 12/17/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: NISHIDA, Kazuhiro, UTSUNOMIYA, Sumio
• Granted Patent: US 9,737,218 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/02108 from analysis of pulse wave characteristics
• CPC Class Codes: A61B 5/0261 using optical means, e.g. infrared light
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 5/7242 using integration

Abstract

A blood pressure measurement device includes: a light emitting unit configured to irradiate a living body with measurement light; a light receiving unit configured to receive reflected or transmitted light of the measurement light; and a computational unit configured to calculate a blood flow and a volume pulse wave based on a light-receiving result from the light receiving unit, and to calculate blood pressure based on the blood flow and blood vessel resistance that is obtained from the volume pulse wave.

Claims

1. A blood pressure measurement device comprising:

a light emitting unit configured to irradiate a living body with light;

a light receiving unit configured to receive light reflected in or transmitted through the living body; and

a computational unit configured to calculate a blood flow and a volume pulse wave based on a light-receiving result from the light receiving unit, and to calculate blood pressure based on the blood flow and blood vessel resistance that is obtained from the volume pulse wave.

2. The blood pressure measurement device according to claim 1,

wherein the computational unit analyzes the frequency of light received by the light receiving unit, and calculates the blood flow using a frequency analysis result.

3. The blood pressure measurement device according to claim 2,

wherein the computational unit calculates the blood flow using Expression (1),

4. The blood pressure measurement device according to claim 1,

wherein the computational unit calculates the blood vessel resistance based on two amplitudes of the volume pulse wave, with the two amplitudes corresponding to a forward wave and a reflected wave, respectively.

5. The blood pressure measurement device according to claim 4,

wherein the computational unit calculates the blood vessel resistance based on a ratio between the two amplitudes.

8. An electronic device including the blood pressure measurement device according to claim 1.

9. An electronic device including the blood pressure measurement device according to claim 2.

10. An electronic device including the blood pressure measurement device according to claim 3.

11. An electronic device including the blood pressure measurement device according to claim 4.

12. An electronic device including the blood pressure measurement device according to claim 5.

6. An electronic device comprising:

a main unit; and

a band portion configured to mount the main unit on a measurement site of a living body,

wherein the main unit includes

a light emitting unit configured to irradiate the living body with light;

a light receiving unit configured to receive light reflected in or transmitted through the living body; and

a computational unit configured to calculate a blood flow and a volume pulse wave based on a light-receiving result from the light receiving unit, and to calculate blood pressure based on the blood flow and blood vessel resistance that is obtained from the volume pulse wave.

7. An electronic device in which an optical probe and a main device are communicatively connected to each other,

wherein the optical probe includes

a light emitting unit configured to irradiate a living body with light, and

a light receiving unit configured to receive light reflected in or transmitted through the living body, and

wherein the main device includes a computational unit configured to calculate a blood flow and a volume pulse wave based on a light-receiving result from the light receiving unit, and to calculate blood pressure based on the blood flow and blood vessel resistance obtained from the volume pulse wave.

13. A blood pressure measurement method that is executed by a device including a light emitting unit configured to irradiate a living body with light and a light receiving unit configured to receive light reflected in or transmitted through the living body, the method comprising:

calculating a blood flow and a volume pulse wave based on a light-receiving result from the light receiving unit; and

calculating blood pressure based on the blood flow and blood vessel resistance that is obtained from the volume pulse wave.