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WO2018142865A1 - Dispositif de mesure de pouls, dispositif portable et procédé de mesure de pouls - Google Patents

Dispositif de mesure de pouls, dispositif portable et procédé de mesure de pouls Download PDF

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Publication number
WO2018142865A1
WO2018142865A1 PCT/JP2018/000390 JP2018000390W WO2018142865A1 WO 2018142865 A1 WO2018142865 A1 WO 2018142865A1 JP 2018000390 W JP2018000390 W JP 2018000390W WO 2018142865 A1 WO2018142865 A1 WO 2018142865A1
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WO
WIPO (PCT)
Prior art keywords
light
polarization plane
pulse
measuring device
light emitting
Prior art date
Application number
PCT/JP2018/000390
Other languages
English (en)
Japanese (ja)
Inventor
鈴木　雅弘
上田　智章
Original Assignee
Kddi株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kddi株式会社 filed Critical Kddi株式会社
Publication of WO2018142865A1 publication Critical patent/WO2018142865A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • A61B5/0245—Measuring pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21—Polarisation-affecting properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke

Definitions

  • the present invention relates to a pulse measurement technique using light.
  • Patent Document 1 discloses a photoelectric pulse measuring device.
  • the photoelectric pulse measuring device irradiates a human body with light and measures the pulse by utilizing the difference in absorbance due to blood pulsation.
  • Such a photoelectric pulse measuring device is widely used in wearable devices such as smart watches.
  • a wearable device having a photoelectric pulse measuring device is configured such that a light emitting unit that emits light is in close contact with the human body when the device is worn. However, if the light emitting unit that emits light does not come into close contact with the human body due to the movement of the person wearing the wearable device or the like, the pulse reading may become unstable.
  • the pulse measurement device transmits light having a polarization plane different from the polarization plane of the regular reflection light of the light emitted by the light emission means and the light emission means that irradiates the light having the first polarization plane.
  • FIG. 1 shows a state in which the pulse measuring device is in close contact with the human body 1.
  • the light emitting unit 2 emits light
  • the light receiving unit 3 receives reflected light of the light emitted by the light emitting unit 2 and outputs a signal corresponding to the received light intensity.
  • a determination unit (not shown) in FIG. 1 determines the pulse based on the output signal of the light receiving unit 3.
  • one light receiving unit 3 and one light emitting unit 2 are provided, but a plurality of light receiving units 3 and two light emitting units 2 may be provided.
  • FIG. 2 is a graph showing the absorbance of blood hemoglobin.
  • hemoglobin exists as oxyhemoglobin (HbO2) combined with oxygen, and has a wavelength of 650 to 850 nm, that is, a large absorbance of infrared light. Since the amount of blood flowing through the artery changes due to the heartbeat, the amount of light absorption also changes according to the pulse.
  • the light emitting unit 2 of the pulse measuring device emits, for example, infrared light having a high absorbance of HbO2, and the light receiving unit 3 detects reflected light inside the human body. The intensity of the reflected light from the inside of the human body received by the light receiving unit 3 changes according to the pulsation due to the fluctuation of the light absorption due to the pulsation. can do.
  • FIG. 3 is a photograph of the hand part of a human body obtained by irradiating infrared rays and acquired by an infrared camera. The hand is completely white due to total reflection.
  • what is important for measuring the pulse is only the so-called deep reflected light that is scattered and reflected by the artery inside the human body.
  • the light receiving unit 3 mainly receives regular reflection light on the skin surface.
  • FIG. 6 shows deep reflection light and regular reflection light on the skin surface when the pulse measurement device is not in close contact with the human body. As shown in FIG.
  • the light emitting part 2 In order to suppress specular reflection light on the skin surface, it is necessary to make at least the light emitting part 2 in close contact with the human body. However, there may be a gap between the light emitting part 2 and the human body due to body movement or the structure of the pulse measuring device or the wearable terminal equipped with the body movement. In this case, the pulse is measured by the total reflected light on the skin surface. Becomes difficult.
  • FIG. 5 shows the configuration of the pulse measuring device 10 according to the present embodiment that solves this problem.
  • the light emitting unit 2 includes a light emitting element 21 and a first polarizing filter 22.
  • the light emitting element 21 emits infrared light, for example.
  • the light irradiated by the light emitting element 21 irradiates the human body via the first polarizing filter 22.
  • the light receiving unit 3 includes a light receiving element 31 and a second polarizing filter 32.
  • the reflected light of the light irradiated on the human body is received by the light receiving element 31 through the second polarizing filter 32.
  • the light receiving element 31 outputs a signal having a level corresponding to the received light intensity.
  • the determination unit 4 determines the pulse based on the fluctuation of the level of the output signal of the light receiving element 31.
  • the first polarizing filter 22 and the second polarizing filter 32 are provided so as to be in a so-called crossed Nicol state that does not transmit specularly reflected light on the human skin surface. That is, the first polarizing filter 22 is disposed so as to transmit only the light having the first polarization plane. Therefore, only the light of the first polarization plane out of the light irradiated by the light emitting element 21 is emitted from the light emitting unit 2. On the other hand, the second polarizing filter 32 is provided so as not to transmit specularly reflected light on the skin surface of the light having the first polarization plane.
  • the second polarization filter 32 is provided so that the polarization plane of the light transmitted by the second polarization filter 32 is orthogonal to the polarization plane of the regular reflection light of the light of the first polarization plane. Since the deep reflected light is scattered reflected light, the plane of polarization thereof is various. Therefore, all components of the deep reflected light are not cut by the second polarizing filter 32, and at least some of the components. Is transmitted through the second polarizing filter 32 and received by the light receiving element 31. That is, regardless of the state of attachment of the pulse rate measuring device to the human body, the light receiving unit 3 mainly receives only the deep reflected light, thereby accurately measuring the pulse regardless of the state of attachment of the pulse measuring device to the human body. can do.
  • the fifth has one light-emitting unit 2 and one light-receiving unit 3 each. However, a plurality of light-receiving units 3 and a plurality of light-receiving units 3 are provided. Even if it is the structure which provides the light emission part 2 and the one light-receiving part 3, the structure which provides the several light emission part 2 and the several light-receiving part 3 may be sufficient. Further, by providing the second polarizing filter 32 so as to transmit only the light having the polarization plane orthogonal to the polarization plane of the regular reflection light of the light having the first polarization plane, the second polarization filter 32 is formed on the skin surface of the light having the first polarization plane. However, the present invention is not limited to such a configuration.
  • the polarization plane of the light transmitted by the second polarization filter 32 only needs to be different from the polarization plane of the regular reflection light of the light of the first polarization plane.
  • the first polarizing filter 22 can be omitted by using, for example, a laser diode that emits only light having a predetermined polarization plane as the light emitting element 21.
  • the pulse measuring device 10 can be provided in a wearable device that is worn on the human body, such as a smart watch.
  • the present invention can also be realized as a pulse measuring method.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Cardiology (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Biophysics (AREA)
  • Physiology (AREA)
  • Signal Processing (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Ce dispositif de mesure de pouls comprend : un moyen d'émission de lumière pour l'émission d'une lumière présentant un premier plan de polarisation; un moyen de réception de lumière pour l'émission et la réception d'une lumière présentant un plan de polarisation différent de celui de la lumière spéculairement réfléchie de la lumière émise par le moyen d'émission de lumière; et un moyen de détermination pour la détermination du pouls sur la base de l'intensité de la lumière reçue par le moyen de réception.
PCT/JP2018/000390 2017-02-02 2018-01-11 Dispositif de mesure de pouls, dispositif portable et procédé de mesure de pouls WO2018142865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017017591A JP2018121955A (ja) 2017-02-02 2017-02-02 脈拍測定装置、ウェアラブル装置及び脈拍測定方法
JP2017-017591 2017-02-02

Publications (1)

Publication Number Publication Date
WO2018142865A1 true WO2018142865A1 (fr) 2018-08-09

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PCT/JP2018/000390 WO2018142865A1 (fr) 2017-02-02 2018-01-11 Dispositif de mesure de pouls, dispositif portable et procédé de mesure de pouls

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WO (1) WO2018142865A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10211176A (ja) * 1997-01-31 1998-08-11 Seiko Epson Corp 反射光検出器および脈波検出装置
JPH10248819A (ja) * 1997-03-13 1998-09-22 Seiko Epson Corp 脈波診断装置
JP2013215260A (ja) * 2012-04-05 2013-10-24 Omron Healthcare Co Ltd 血圧計
JP2014507208A (ja) * 2011-01-19 2014-03-27 ドルフィン テクノロジーズ オサケ ユキチュア 心臓血管脈拍波動の視覚化の方法および装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10211176A (ja) * 1997-01-31 1998-08-11 Seiko Epson Corp 反射光検出器および脈波検出装置
JPH10248819A (ja) * 1997-03-13 1998-09-22 Seiko Epson Corp 脈波診断装置
JP2014507208A (ja) * 2011-01-19 2014-03-27 ドルフィン テクノロジーズ オサケ ユキチュア 心臓血管脈拍波動の視覚化の方法および装置
JP2013215260A (ja) * 2012-04-05 2013-10-24 Omron Healthcare Co Ltd 血圧計

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