WO2006057313A1 - Détecteur de biosignaux - Google Patents

Détecteur de biosignaux Download PDF

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Publication number
WO2006057313A1
WO2006057313A1 PCT/JP2005/021608 JP2005021608W WO2006057313A1 WO 2006057313 A1 WO2006057313 A1 WO 2006057313A1 JP 2005021608 W JP2005021608 W JP 2005021608W WO 2006057313 A1 WO2006057313 A1 WO 2006057313A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric film
cushion material
body surface
detection device
pressure fluctuation
Prior art date
Application number
PCT/JP2005/021608
Other languages
English (en)
Japanese (ja)
Inventor
Etsunori Fujita
Shinichiro Maeda
Original Assignee
Delta Tooling Co., Ltd.
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 Delta Tooling Co., Ltd. filed Critical Delta Tooling Co., Ltd.
Priority to JP2006547836A priority Critical patent/JPWO2006057313A1/ja
Publication of WO2006057313A1 publication Critical patent/WO2006057313A1/fr

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Classifications

    • 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 pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02444—Details of sensor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02—Details of sensors specially adapted for in-vivo measurements
    • 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 pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/0816—Measuring devices for examining respiratory frequency

Definitions

  • the present invention is supported by various seats such as a vehicle seat used for transportation equipment such as automobiles, trains, and airplanes, office seats, and seats that are seated by a person at the time of inspection or diagnosis in a hospital.
  • the present invention relates to a biological signal detection device for detecting a biological signal of a human being, for example, a pulse wave, a pulsation, a respiration, etc. of the buttocks and thighs.
  • the present invention relates to a biological signal detection apparatus suitable for performing.
  • Patent Document 1 and Patent Document 2 include a heartbeat or a pulse.
  • a technique for monitoring the biological state by analyzing the chaos has been proposed. According to the techniques disclosed in Patent Documents 1 and 2, it is not necessary to attach a powerful device for brain wave measurement to the head, and the biological state of the driver can be easily evaluated.
  • the devices disclosed in Patent Documents 1 and 2 are both thin-film piezoelectric elements (piezoelectric film sensors) in which vibrations of the body surface accompanying the pulsation of the heart are attached to the seating surface of the cushion material constituting the seat cushion. Sensing with
  • Patent Document 1 Japanese Patent Laid-Open No. 9-308614
  • Patent Document 2 Japanese Patent Laid-Open No. 10-146321
  • the present invention reduces the noise signal included in the electrical signal data of the pressure fluctuation detected by the pressure fluctuation detection sensor force such as a piezoelectric film sensor, and further increases the determination accuracy of the biological state, the degree of fatigue, and the like. It is an object of the present invention to provide a biosignal detection device that can perform the above.
  • the biological signal detection device of the present invention has a gap between a position close to the body surface and a position spaced apart from at least one of the shift on the seat cushion side and the seat back side.
  • Differential output means for outputting the difference between the output values of the pair of pressure fluctuation detection sensors.
  • One of the pair of pressure fluctuation detection sensors is supported by an upper cushion material disposed close to the body surface, and the other is disposed at a lower layer than the upper cushion material. It can be provided in support of the material.
  • the pair of pressure fluctuation detection sensors can be respectively arranged on the front side and the back side of an arbitrary cushion material.
  • the upper-layer cushion material and the lower-layer cushion material are preferably formed from a three-dimensional knitted fabric.
  • the said arbitrary cushioning material is also formed of the solid knitting force.
  • a pair of pressure fluctuation detections disposed at a distance from each other between a position close to the body surface and a position separated from the body surface on at least one of the displacement on the seat cushion side and the seat back side.
  • a sensor is provided, and the difference between the output values of the pair of pressure fluctuation detection sensors is output. For this reason, external vibration noise transmitted from the road surface is detected by each pressure fluctuation detection sensor, but vibrations of the body surface due to pulse waves, pulsations, breathing, etc. are mainly close to the body surface. It is detected by the arranged pressure fluctuation detection sensor. Therefore, by taking the difference between the two, it is possible to more accurately detect pressure fluctuations associated with biological signals such as pulse wave, pulsation, and respiration.
  • the biological signal detection device of the present invention can be used in an environment where external vibration is hardly applied, such as office seats and seats where people are seated during examinations and diagnoses in hospitals.
  • an environment where external vibration is hardly applied such as office seats and seats where people are seated during examinations and diagnoses in hospitals.
  • noise due to external vibrations can be effectively reduced, it is particularly suitable as a device that is provided on a vehicle seat such as an automobile and used to determine the occupant's biological state (such as sleep onset and fatigue).
  • FIG. 1 is a diagram showing a schematic configuration of a seat attached with a biological signal detection device that is helpful in one embodiment of the present invention.
  • FIG. 2 is a diagram showing test results for verifying the appearance of a sleep onset predictive signal in a car running test, (a) is the analysis result of the fingertip volume pulse wave, and (b) is the first result. ( C ) is the analysis result using the difference between the first and second piezoelectric film sensors.
  • FIG. 3 corresponds to FIG. 2 (a), and is the time-series data of the original waveform of the fingertip volume pulse wave obtained by measuring the fingertip volume pulse wave measuring force before detecting the sleep onset signal.
  • FIG. 4 corresponds to FIG. 2 (b), and is the original waveform time-series data of the first piezoelectric film sensor before the detection of the sleep onset signal.
  • FIG. 5 corresponds to FIG. 2 (c), and shows the original waveform time-series data of the difference between the first and second piezoelectric film sensors 10, 11 (difference sensor) before detection of the slumber predictive signal. is there.
  • FIG. 6 corresponds to FIG. 2 (a), and is the original waveform time series data of the finger plethysmogram obtained by detecting the finger plethysmogram at the time of detection of a sleep symptom signal.
  • FIG. 7 corresponds to FIG. 2 (b), and is the original waveform time-series data of the first piezoelectric film sensor at the time of detection of a sleep signal.
  • FIG. 8 corresponds to FIG. 2 (c), and shows the original waveform time-series data of the difference between the first and second piezoelectric film sensors 10, 11 (difference sensor) at the time of detection of a sleep signal. is there.
  • FIG. 9 corresponds to FIG. 2 (a) and shows the original waveform time series data of the finger plethysmogram obtained by detecting the finger plethysmogram after detecting a sleep signal.
  • FIG. 10 corresponds to FIG. 2 (b), and is the original waveform time-series data of the first piezoelectric film sensor after the detection of the sleep onset signal.
  • FIG. 11 corresponds to FIG. 2 (c), and the original waveform time-series data of the difference between the first and second piezoelectric film sensors 10 and 11 (difference sensor) after detection of the onset of sleep signal It is.
  • FIG. 1 is a schematic configuration diagram of a state in which a biological signal detection device 1 according to an embodiment of the present invention is attached to a vehicle seat 100 such as an automobile.
  • the biological signal detection device 1 includes a pair of (first and second) piezoelectric film sensors 10 and 11 as pressure fluctuation detection sensors.
  • the signal data detected by the piezoelectric film sensors 10 and 11 is transmitted to the arithmetic unit 20, and predetermined data processing is performed.
  • Force that can be used with any pressure fluctuation detection sensor other than the piezoelectric film sensors 10 and 11 The vibration absorption characteristics of the seat cushion 110, etc. that does not feel uncomfortable even if it is attached to the seat cushion 110, etc. For this reason, it is preferable to use a piezoelectric film sensor that is formed into a thin film.
  • the first and second piezoelectric film sensors 10 and 11 may be provided on either the seat cushion 110 side or the seat back 120 side (including the headrest), or may be provided on both.
  • the seat cushion 110 is always in contact with the human body when seated, it is provided at least on the seat cushion 110 side, and biological displacement that propagates through the buttocks muscle, such as buttocks pulse wave, breathing, pelvic movement or body movement.
  • a configuration for detecting a signal (fluctuation) is preferable.
  • the seat cushion 110 side when mounted on the seat cushion 110 side, for example, it may be arranged only near the sciatic tuberosity, but the posture (sacral posture) where the buttock is shifted forward by long-term seating is taken. May cause the sensor to fall outside the detection range of the sensor, so in addition to the sensor placed near the sciatic nodule, one or more sensors may be placed at a position shifted before or after the sensor. Is possible. This is the same when the seatback 120 is mounted, and can be placed at multiple locations.
  • the first and second piezoelectric film sensors 10, 11 are provided at a distance from each other at a position close to the body surface and a position spaced apart from the body surface. For this reason, the pressure fluctuation due to the vibration of the body surface accompanying the biological signal is mainly detected by the first piezoelectric film sensor 10.
  • the first piezoelectric film sensor 10 is fixed near the surface of the cushion material 111 on the upper layer side of the seat cushion 110. Although it can be exposed and attached to the surface of the cushion material 111 on the upper layer side, it is preferable that the cushion material 111 is incorporated in a position close to the surface in order to protect the detection surface.
  • the second piezoelectric film sensor 11 is disposed on the back side of the lower cushion material 112 positioned below the upper cushion material 111 and is fixed to the seat surface of the seat cushion 110.
  • the second piezoelectric film sensor 11 is an upper cushion material 1
  • the lower-layer cushion material 112 is used so that the biosignal detection data is not the same as that of the first piezoelectric film sensor 10. It is preferable to provide them. Therefore, “spaced between a position close to the body surface and a position spaced apart from each other” means that at least part of the cushion material 111, 112, which performs the cushion function, includes the first and second piezoelectric films. This means that the sensor is positioned between the sensors so that there is a gap between them.
  • the upper-layer cushion material 111 and the lower-layer cushion material 112 are both arranged on the seating surface of the seat cushion 110 in FIG. That is, the upper-layer cushion material 111 and the lower-layer cushion material 112 are independent cushions that can be disposed on the seat surface of the seat cushion 110 as necessary. In this case, the upper-layer cushion material 111 and the lower-layer cushion material 112 may be integrated, or may be configured separately. Further, for example, the lower cushion material 112 may be incorporated into the seat cushion 110! /, And both the upper cushion material 111 and the lower cushion material 112 are incorporated into the seat cushion 110. It is good also as a cushioning material.
  • lower cushion material means to include all cushion materials located in the lower layer than the upper cushion material 111 close to the body surface. “Supported by a sillon material” may be fixed to any cushion material. In FIG. 1, the force with which the second piezoelectric film sensor 11 is fixed to the surface (seat surface) of the cushion material of the seat cushion 110 itself and the lower cushion material 112 is laminated thereon, for example, It may be fixed to the back surface of the cushion material 112.
  • a solid knitted fabric As the cushion material 111 on the upper layer side and the cushion material 112 on the lower layer side, it is preferable to use a solid knitted fabric.
  • a three-dimensional knitted fabric reciprocates between a pair of ground knitted fabrics spaced apart from each other and the pair of ground knitted fabrics.
  • the knitted fabric has a three-dimensional three-dimensional structure having a large number of connecting yarns to be joined.
  • Such a three-dimensional knitted fabric has moderate elasticity, and exhibits a soft panel characteristic at a single point concentrated load. Obtained when the muscle is pressurized to 30mm or 98mm in diameter Panel characteristics close to load-deflection characteristics (panel characteristics). For this reason, it is suitable for transmitting slight pressure fluctuations of muscles caused by human breathing, heartbeat (pulse wave), body movement, etc.
  • Each output value obtained from the first and second piezoelectric film sensors 10 and 11 is sent to the calculation unit 20, and the difference between both is taken by the difference output means incorporated in the calculation unit 20.
  • Predetermined data processing is performed using the signal data.
  • the differential output means obtains a difference between the output value of the first piezoelectric film sensor 10 and the output value of the second piezoelectric film sensor 11 at every arbitrary sampling period.
  • Examples of data processing performed by the calculation unit 20 include data processing for determining a biological state such as a sleep onset sign disclosed in Japanese Patent Application No. 2003-180294 and Japanese Patent Application No. 2004-89263 proposed by the present applicant. Means or a data processing means for quantitatively determining the degree of fatigue disclosed in Japanese Patent Application No. 2003-363902 can be applied.
  • the former detects the peak value of each period of the original waveform of the signal data obtained by the above-described differential output means force, and from each peak value, the peak value on the upper limit side for each predetermined time range Is calculated as the power value, and the power value is calculated by sliding the slope of the power value with respect to the time axis in the specified time range at the specified slide lap ratio a specified number of times.
  • the signal data is chaotically analyzed to calculate the maximum Lyapunov exponent, the peak value of each period of the time-series change waveform of the maximum Lyapunov exponent is detected, and the predetermined peak value of the maximum Lyapunov exponent is determined.
  • the point is preferably a means for determining, as a sleep predictive signal, a time point when the power value gradient and the maximum Lyapunov exponent gradient stably show a phase difference of about 180 degrees in the time-series signal.
  • the latter is a means for obtaining the integral value by processing the absolute value of the time-series signal when the value slope is obtained as described above, and obtaining the obtained integral value as the degree of fatigue.
  • the signal data obtained from the biological signal detection device of the present embodiment is the difference between the output values of the first and second piezoelectric film sensors 10 and 11, external vibration noise is reduced, and the biological signal is The signal data is more prominently captured, and when used in the data processing means described above, it is possible to more accurately determine the timing of sleep onset and the degree of fatigue. [0020] (Test example)
  • a seat 100 similar to that shown in Fig. 1 was installed in the passenger seat of the car, traveling on the highway, and the time series fluctuations of the power value gradient and the maximum Lyapunov exponent gradient were obtained, and the appearance of the sleep predictive signal was verified.
  • the seat 100 is a seat cushion 110 and a seat back 120.
  • a second piezoelectric film sensor 11 is fixed to the surface, and a lower layer cushioning material 112 is laminated on the second piezoelectric film sensor 11, and an upper layer cushion that incorporates the first piezoelectric film sensor 10 at a position close to the surface. Material 11 1 was laminated.
  • the upper-layer cushion material 111 is a three-dimensional knitted fabric (product number: 49013D) manufactured by Sumie Textile Co., Ltd., knitted using a double raschel knitting machine, and has the following characteristics.
  • Thickness 10. 66mm
  • the cushion material 112 on the lower layer side is a three-dimensional knitted fabric (product name: “Space Fabric”) manufactured by Seiren Co., Ltd., and has the following configuration having the following characteristics.
  • Thickness 2.5mm Knitted fabric density: 25 whale Z inch, 48 course Z inch
  • Residual distortion rate vertical 1%, horizontal 1%
  • the used piezoelectric film sensors 10 and 11 were all Tokyo Sensor Co., Ltd., product name: PIEZ O FILM LDT series, model number: LDT4-028KZL.
  • Fig. 2 shows the analysis result of the fingertip volume pulse wave, (b) shows the analysis result using only the data of the first piezoelectric film sensor 10, and (c) shows the first and second piezoelectric films. It is the analysis result using the difference of film sensors 10 and 11.
  • the power value slope and the maximum Lyapunov exponent slope are approximately 180 degrees between 800 seconds and 1300 seconds. After that, since the fluctuation range of the power value slope becomes smaller, the range from 800 seconds to 1300 seconds can be determined as a sleep onset predictive signal. In addition, it was reported that the subject began to try at this point in the observation by the rear seat observer. Therefore, it is compared with the case where the determination result according to FIG. 2 (a) is assumed to be a correct value and the data obtained only in the first piezoelectric film sensor 10 of FIG. 2 (b) is processed. In Fig.
  • Fig. 3 Fig. 6 and Fig. 9 correspond to Fig. 2 (a), and are the original waveform time series data of the fingertip volume pulse wave obtained from the fingertip volume pulse wave measuring device.
  • Fig. 7 and Fig. 10 correspond to Fig. 2 (b) and are the original waveform time series data of the first piezoelectric film sensor 10 (detection sensor).
  • Fig. 5, Fig. 8 and Fig. 11 show Fig. 2 This corresponds to (c) and is the original waveform time-series data of the difference between the first and second piezoelectric film sensors 10, 11 (difference sensor).
  • Figures 6 to 8 show the data from 900 seconds to 1100 seconds when the sleep onset signal was captured.
  • Figures 3 to 5 show the data before the sleep onset signal was captured
  • Fig. 9 FIG. 11 shows data after the sleep signal is captured.
  • FIG. 9 is compared to FIG. 4 and FIG. 11 is compared to FIG. 9 fingertips It approaches the data of plethysmogram, and it is very powerful.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Veterinary Medicine (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Physiology (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)

Abstract

L’invention permet de réduire le signal de bruit inclus dans des données de signaux électriques proprement dites représentant une variation de pression détectée par un capteur de film piézoélectrique afin d’accroître la précision de jugement de la condition d’un organisme. Une paire de capteurs de film piézoélectrique (10, 11) sont espacés en un point près de la surface du corps et en un point écarté de la surface du corps et installés au niveau d'au moins l'un parmi le coussin de siège (110) et le dossier de siège (120). La différence entre les valeurs de sortie de la paire de capteurs de film piézoélectrique (10, 11) est générée. Les capteurs de film piézoélectrique (10, 11) détectent le bruit de vibration externe transmis de la surface de roulement. Cependant, la vibration de la surface du corps due aux impulsions, aux battements de coeur et à la respiration est largement détectée par le premier capteur de film piézoélectrique (10) disposé près de la surface du corps. C’est la raison pour laquelle en mesurant la différence entre les deux éléments, on peut déterminer plus précisément la variation de pression due au biosignal comme les impulsions, les battements du coeur et la respiration.
PCT/JP2005/021608 2004-11-25 2005-11-24 Détecteur de biosignaux WO2006057313A1 (fr)

Priority Applications (1)

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JP2006547836A JPWO2006057313A1 (ja) 2004-11-25 2005-11-24 生体信号検出装置

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JP2004341070 2004-11-25
JP2004-341070 2004-11-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012120586A (ja) * 2010-12-06 2012-06-28 Nissan Motor Co Ltd 心肺機能測定装置及び心肺機能測定方法
CN103300869A (zh) * 2013-05-29 2013-09-18 哈尔滨工业大学 基于人体呼吸信号的汽车驾驶员疲劳实时监测系统
JP2019201804A (ja) * 2018-05-22 2019-11-28 株式会社デンソー 生体情報検出装置
JP2020092912A (ja) * 2018-12-13 2020-06-18 テイ・エス テック株式会社 生体センサー及び乗物用シート
WO2020122135A1 (fr) * 2018-12-13 2020-06-18 テイ・エス テック株式会社 Capteur biologique et siège de véhicule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7020154B2 (ja) * 2018-02-02 2022-02-16 富士フイルムビジネスイノベーション株式会社 情報処理システム

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JPH023927U (fr) * 1988-06-17 1990-01-11
JPH11326084A (ja) * 1998-05-12 1999-11-26 Isuzu Motors Ltd ドライバ状態検出装置

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JP3098843B2 (ja) * 1992-03-19 2000-10-16 松下電器産業株式会社 車載用心拍検出装置
JP3011358B2 (ja) * 1994-11-16 2000-02-21 パイオニア株式会社 心拍測定装置
JP2001279572A (ja) * 2000-03-28 2001-10-10 Asahi Kasei Corp 立体編物布帛
JP4789342B2 (ja) * 2001-05-10 2011-10-12 株式会社デルタツーリング クッション材、シート及びパイル糸の植毛方法
JP4120537B2 (ja) * 2003-09-02 2008-07-16 松下電器産業株式会社 生体情報検出装置
JP2005095408A (ja) * 2003-09-25 2005-04-14 Matsushita Electric Ind Co Ltd 生体状態判断装置及び支援システム

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JPH023927U (fr) * 1988-06-17 1990-01-11
JPH11326084A (ja) * 1998-05-12 1999-11-26 Isuzu Motors Ltd ドライバ状態検出装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012120586A (ja) * 2010-12-06 2012-06-28 Nissan Motor Co Ltd 心肺機能測定装置及び心肺機能測定方法
CN103300869A (zh) * 2013-05-29 2013-09-18 哈尔滨工业大学 基于人体呼吸信号的汽车驾驶员疲劳实时监测系统
JP2019201804A (ja) * 2018-05-22 2019-11-28 株式会社デンソー 生体情報検出装置
JP7093922B2 (ja) 2018-05-22 2022-07-01 株式会社デンソー 生体情報検出装置
JP2020092912A (ja) * 2018-12-13 2020-06-18 テイ・エス テック株式会社 生体センサー及び乗物用シート
WO2020122135A1 (fr) * 2018-12-13 2020-06-18 テイ・エス テック株式会社 Capteur biologique et siège de véhicule
US11553864B2 (en) 2018-12-13 2023-01-17 Ts Tech Co., Ltd. Biological sensor and vehicle seat

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