Blood pressure detecting device, blood pressure detecting method, blood pressure detecting program, and strain sensor for blood pressure detection

• US 20060206031A1
• Filed: 03/08/2006
• Published: 09/14/2006
• Est. Priority Date: 03/09/2005
• Status: Abandoned Application

• Current Assignee: Motoharu Hasegawa
• Original Assignee: Motoharu Hasegawa
• Inventors: Hasegawa, Motoharu
• Application Number:
  US11/370,020
• Publication Number:
  US 20060206031A1
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Abstract

The present invention may detect a maximum blood pressure and a minimum blood pressure from a viewpoint different from that of a conventional blood pressure measuring method. The present invention propose a strain sensor for blood pressure detection, comprising: a pressure transducer including: a metal thin plate for receiving a beat of a living body; and a strain gauge provided on a surface of the metal thin plate, for detecting a pressure based on the beat propagating through the metal thin plate.

Claims

1. A strain sensor for blood pressure detection, comprising:

a pressure transducer including;

a metal thin plate for receiving a beat of a living body; and

a strain gauge provided on a surface of the metal thin plate, for detecting a pressure based on the beat propagating through the metal thin plate.

2. A strain sensor for blood pressure detection according to claim 1, wherein the strain gauge comprises a semiconductor strain gauge.

3. A strain sensor for blood pressure detection according to claim 1, wherein the strain gauge comprises a foil strain gauge.

4. A strain sensor for blood pressure detection according to claim 1, wherein the strain gauge is sandwiched between the metal thin plate and another metal thin plate.

5. A strain sensor for blood pressure detection according to claim 1, wherein the metal thin plate has a diameter of 5 mm to 20 mm and a thickness that is equal to or smaller than 2 mm and corresponds to a thickness for maintaining a thin plate shape and the metal thin plate comprises a copper alloy.

6. A strain sensor for blood pressure detection according to claim 5, wherein the metal thin plate comprises a phosphor bronze plate.

7. A blood pressure detecting device, comprising:

pulse wave detecting means for detecting a pulse wave, including a strain sensor for blood pressure detection that is provided therein; and

compression means for compressing a blood vessel of a living body and gradually reducing a compression pressure to the blood vessel.

8. A blood pressure detecting device according to claim 7, further comprising output means for outputting the pulse wave obtained from the pulse wave detecting means while an occluded artery is gradually opened.

9. A blood pressure detecting device according to claim 7, further comprising blood pressure determining means for determining, as a maximum blood pressure, a pressure at a time when a first notch is caused in a waveform of the pulse wave obtained from the pulse wave detecting means while an occluded artery is gradually opened and determining, as a minimum blood pressure, a pressure at a time when the first notch is lost.

10. A blood pressure detecting device according to claim 7, wherein the strain sensor for blood pressure detection comprises:

a pressure transducer including;

a metal thin plate for receiving a beat of a living body; and

a strain gauge provided on a surface of the metal thin plate, for detecting a pressure based on the beat propagating through the metal thin plate.

11. A blood pressure detecting device according to claim 7, wherein:

the compression means comprises a cuff; and

the strain sensor for blood pressure detection comprises a sensor portion attached to a part of the cuff that is the compression means.

12. A blood pressure detecting device according to claim 7, further comprising a separate band for integrally coupling the cuff that is the compression means to the strain sensor for blood pressure detection and locating the sensor portion of the strain sensor for blood pressure detection at a distance from the cuff to allow measurement during an exercise.

13. A blood pressure detecting method of detecting a maximum blood pressure and a minimum blood pressure based on a pulse wave propagating through an artery, comprising:

using a strain sensor for blood pressure detection;

determining, as the maximum blood pressure, a pressure at a time when a first notch is caused in pulse waveforms obtained while an occluded artery is gradually opened; and

determining, as the minimum blood pressure, a pressure at a time when the first notch is lost.

14. A blood pressure detecting method according to claim 13, further comprising outputting, of the pulse waveforms, a pulse waveform at the time when the first notch is caused and a pulse waveform at the time when the first notch is lost.

15. A blood pressure detecting program for obtaining a maximum blood pressure and a minimum blood pressure based on a pulse wave propagating through an artery, which is executed by a computer, comprising:

a process for calculating, for each unit time, a change in pulse wave that is converted into an electrical signal by a strain sensor for blood pressure detection using a predetermined calculation expression; and

a process for determining a time when a notch is caused in a waveform of the pulse wave and a time when the notch is lost based on the calculated change in pulse wave.