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`JP2007319232 (A)
`(Machine translated text)
`
`Title: Biological Information Measurement Apparatus
`
`information
`biological
`a
`PROBLEM TO BE SOLVED: To provide
`Abstract:
`measurement apparatus having a wrist-fitting shape which is fixed to the wrist
`credibly and stably and assures contact between the skin and a pulse wave
`sensor,
`;SOLUTION: The biological
`information measurement apparatus 10 has a
`wristwatch shape and is used for measuring pulse wave by arranging an enclosure
`100 on the wrist of a user. A bottom face of the enclosure 100 is formed in a
`
`concave surface. A sensor window 11 is formed on a part of the concave surface on
`the bottom face of the enclosure so that the window projects compared to its
`surroundings, and the pulse wave sensor is arranged within the sensor window.
`
`Description:
`Provided is a biological information measuring device that can be fixed to a wrist in
`a stable state with a shape that fits a wrist, and that can reliably contact a pulse
`wave sensor and a skin. The present
`invention relates to a wristwatch-type
`biological
`information measuring apparatus 10 that measures a pulse wave by
`attaching a casing 100 to a user’s wrist, and the bottom surface of the casing 100
`has a concave shape. The sensor window 11 is provided in a part of the concave
`surface of the lower surface so as to protrude fram the peripheral portion, and the
`pulse wave sensor is installed inside the sensor window. .The
`
`bialogical information measuring device
`
`[0001] The present invention relates to a biological information measuring device
`that measures biological
`information such as the main pulse and attached to a
`user's wrist.
`
`information such as a
`Conventionally, as an apparatus for measuring biological
`pulse wave by wearing it on a wrist
`like a wristwatch, there is a main body
`integrated type in which a pulse wave sensor is arranged on the back side of the
`main body.
`In such a biological
`information measuring device, a device for
`improving the contact state with the user’s wrist by arranging a non-planar convex
`translucent plate on the surface of the pulse wave sensor has been devised
`(Japanese Patent No, 3722203). -Patent Document 1).
`
`is said that the palm part is more
`it
`[G003] On the other hand, conventionally,
`sensitive to pulse wave measurement than the wrist part, and the pulse wave
`sensor part is attached to a finger or the like, and is connected to a body attached in
`a wristwatch shape with a cable or the like. An information measuring device Is also
`
`513
`
`513
`
`
`
`known (Japanese Patent No. 3554085-Patent Document 2, Japanese Patent No.
`3535916-Patent Document 3, Japanese Patent No. 335917-Patent Document 4).
`
`in the sensor-body integrated biological information measuring device,
`However,
`when the pulse wave is measured with the wrist by the pulse wave sensor arranged
`on the back side of the body housing, the pulse wave sensor is not used because
`the shape of the human wrist is not flat. There is a problem that it
`is difficult to
`stabilize the contact state between the skin and the wrist.
`
`information measuring apparatus that performs
`in a biological
`[G005] Further,
`measurement with a human palm for improving accuracy, a connector pin of a
`cable that transmits a measurement signal from a pulse wave sensor is inserted
`into a pin jack on the main body side. There has been a problem that the shape of
`the biological information measuring device becomes thick due to the thickness of
`the connector.
`
`[0006] Furthermore, pulse wave measurement with the wrist and pulse wave
`measurement with
`the palm have different preference or measurement
`characteristics depending on the user, and if only one of them can be used, the user
`is dissatisfied or the measurement accuracy cannot be ensured. There was a
`problem that was inevitable.
`Patent No. 3722203 jP Patent No. 3554085 Publication No. 3535916 discloses No.
`3535917 discloses
`
`[00071] The present invention has been made in view of the problems of the prior art
`described above, in the shape to fit the wrist of the user It is an object of the present
`invention to provide a biological
`information measuring apparatus that can be
`stably mounted, can reliably contact the pulse wave sensor and the skin of the
`apparatus mounting site, and can accurately measure biological information.
`
`[0008] Another object of the present invention is to provide a biological information
`measuring apparatus having a thin shape and good wearability.
`
`[0009] The present invention can further cape with a user who is dissatisfied with
`either wrist measurement or finger measurement by adopting a structure capable
`of easily switching between wrist measurement and palm measurement of the
`pulse wave.
`It
`is an object of the present
`invention to provide a biological
`information measuring apparatus that can perform measurement with higher
`accuracy as a whole by using both wrist measurement and palm measurement
`together.
`
`invention js a wristwatch-type biological
`[0010] One feature of the present
`information measuring apparatus that measures a pulse wave by attaching a
`casing to a user's wrist, wherein the casing has a concave battam surface, and the
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`information measuring device, a
`tn the biological
`casing has a concave shape.
`sensor window is provided in a part of the concave surface of the lower surface of
`the sensor window so as to protrude from the peripheral portion, and a pulse wave
`sensoris installed inside the sensor window.
`
`[0011] in the biological information measuring device of the above invention, the
`concave surface of the lower surface of the housing can be an analytical curved
`surface.
`
`information measuring device of the above
`in the biological
`[G012] Further,
`invention,
`the concave surface of the lower surface of the housing can be a
`cylindrical concave surface.
`
`information measuring device of the above
`in the biological
`[0013] Further,
`invention, the concave surface of the lower surface of the housing can be a conical
`concave surface,
`
`[0014] In the biological information measuring apparatus of the above invention,
`the concave surface of the lower surface of the housing can be an elliptical concave
`surface.
`
`[0015] In the biological information measuring apparatus of the above invention,
`the convex top of the sensor window can be a flat surface.
`
`[0016] In the biological information measuring device of the above invention, the
`height of the convex top portion of the sensor window can be set to a height that
`does not protrude outward from the lower surface of the housing.
`
`[0017] In the biological information measuring device of the above invention, the
`sensor window may be configured by a flat surface that can befilled with a part of
`the concave surface of the lower surface of the housing.
`
`[0018] Further, in the biological information measuring apparatus according to the
`above invention, the sensor window can be provided at a position shifted in a
`bending direction from the position of the curved center line an the lower surface of
`the housing.
`
`[6019] In the biological information measuring device of the. above invention, the
`wrist-wom belt connected to the two opposite side surfaces of the casing and the
`center position on the side surface of the casing where the belt is not connected are
`shifted. And a connector for connecting a signal cable for transmitting a pulse wave
`signal from an external pulse wave sensor.
`
`[6020] in the biological information measuring apparatus according to the invention,
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`the pulse wave signal from the external pulse wave sensoris prioritized when the
`signal cable is connected to the connector, and the signal cable is connected to the
`connector. When there is not, an input pulse wave signal switching means for
`switching a pulse wave signal to be used so as to give priority to the pulse wave
`signal from the pulse wave sensor built in the housing can be provided.
`
`[G021] The biological information measuring apparatus according to the present
`invention may further include a gain adjusting unit that adjusts an amplification
`factor according to the input pulse wave signal selected by the input pulse wave
`switching unit.
`
`information measuring device of the above
`in the biological
`[0022] Further,
`invention, the sensor window may be provided at a position closer to the connector
`than a center point on the jower surface of the housing.
`
`[0023] Another feature of the present invention is a wristwatch-type biological
`information measuring apparatus that measures a pulse wave by attaching the
`casing to a user's wrist, and includes a first pulse wave installed on the lower
`surface of the casing. A sensor, a second pulse wave sensor connected to a
`connector provided in the housing via a signal cable, a measurement signal of the
`first pulse wave sensor, and a measurementsignal of the second pulse wave sensor;
`Among the measurement stability determination means for determining whether
`the measurement stability is good or not, and the measurement stability
`determination means among the first pulse wave sensor and the second pulse wave
`sensor, The biological information measuring apparatus includes an analysis unit
`that performs pulse wave detection using a measurement signal from a pulse wave
`sensor that outputs the determined measurement signal.
`
`[0024] According to the present invention, since the bottom surface of the housing
`is concave to fit the wrist and the pulse wave sensor is convex, the biological
`information measuring device can be stably fixed to the user's wrist. In addition, the
`contact state between the pulse wave sensor and the skin can be ensured, the
`pulse wave can be measured rellably,
`the casing can be made thin, and the
`wearability can be improved.
`
`[0025] Further, according to the present invention, it is possible to cope with a user
`who is dissatisfied with either wrist measurement or finger measurement by
`adopting a structure capable of easily switching between pulse wave wrist
`measurement and palm measurement. By using both wrist measurement and palm
`measurement of the pulse wave,it is possible to improve accuracy as a whole as
`compared with the case of using only one of them.
`
`Hereinafter, embodiments of the present invention will be described in detail with
`reference to the drawings.
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`shows a functional configuration of a biological
`1
`(First Embodiment) FIG.
`information measuring apparatus 10 accarding to a first embodimentof the present
`invention, and FIG. 2 shows its appearance.
`
`information measuring apparatus 10 of the
`As shown in FIG. 2, the biological
`present embodiment is used by attaching it to a wrist of a user like a wristwatch,
`and is attached to each of two opposing side surfaces of the housing 100. A belt 101
`is connected, an information display unit 19 is provided on the top surface of the
`housing 100, and an operation unit 20 for mode switching operation and backlight
`lighting operation is provided. In the case of the present embodiment, the lower
`surface of the housing 100 is formed in a concave shape in which the belt center
`line direction is a curved direction. A main body-integrated first pulse wave
`measurement unit 11 is installed on the lower surface side of the casing 100 which
`is a concave surface. {n addition, the connector 110 for connecting the signal cable
`12A for transmitting the signal of the external second pulse wave measurement
`unit 12 is a side surface that is 90 degrees away from the beit connection surface,
`and the side surface 102 that comes to the user's hand side in a normal wearing
`state. it is installed.
`
`As shown in FIG. L, the biological information measuring device 10 of the present
`embodimentis installed on the lower surface of the housing 100, and a first pulse
`wave measuring unit 11 that measures pulse waves, and the biological information
`measuring device. 10. is connected to the outside with a cable 12A, for example, the
`second pulse wave measurement unit 12 that measures the pulse wave on the
`finger pad surface by wrapping it around a finger, and the presence or absence of
`connection between the second pulse wave measurement unit 12 or
`the
`measurement state And a pulse wave switching unit 13 for selecting one of the first
`pulse wave measurement unit 11 and the second pulse wave measurement unit 12
`for pulse wave measurement, and an amplifier for amplifying and filtering the
`measured pulse wave waveform Thefilter unit 14, the gain adjusting unit 15 that
`adjusts the amplification factor of the amplifier / filter unit 14 according to the
`measurement state,
`the static acceleration due to the dynamic acceleration
`generated by the movement of the user's wrist and the gravitational acceleration
`accompanying the posture. Measurement to detect both dynamic acceleration Unit
`16, A/ D conversion unit 17 for A / D converting the output of first pulse wave
`measurement unit 11 or second pulse wave measurement unit 12 and the output of
`acceleration measurement unit 16, and A/D conversion unit 17 capture An analysis
`unit 18 for analyzing the data, a data storage unit 19 for storing the result of
`analysis by the analysis unit 18, a display unit 20 for displaying the measurement
`state, time, status, etc., mode switching operation and display unit 20 An operation
`unit 21 for performing operation such as turning on a backlight, an operation
`frequency switching unit 22 for switching an operation frequency according to a
`mode, and communication for transmitting data stored in the data storage unit 19
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`to an external terminal. Unit 23, a battery 24 that supplies power to the entire
`biological information measuring apparatus 10, a battery voltage monitoring unit
`25 that monitors the voltage of the battery 24, and a control unit 26 that controls
`the entire function.
`
`[0030] The operation unit 21 is a push switch that allows a user to operate mode
`switching such as a time mode and a measurement mode, and to give a backlight
`lighting instruction. The display unit 20 is a display device that displays time, pulse
`rate, pulse wave measurement state, battery, memory, communication state, and
`sleep time as a result, and is configured by an LCD. The data storage unit 19 uses a
`flash memory, and stores measurement data such as sleep time history, pulse
`interval data, and body movement data as measurement results.
`
`The acceleration measuring unit 16 is for detecting body movement, and is, for
`example, an acceleration sensor that measures acceleration of -2G to 2G in three
`axis directions, and is mounted in the biological information measuring apparatus
`main body 10.
`
`[0032] The first pulse wave measurement unit 11 and the second pulse wave
`measurement unit 12, which will be described in detail later, are composed of a
`green LED and a photodiode {PD}, which irradiates light on the skin surface of the
`wrist, fingers, or palm, thereby reducing the capillary. The pulse wave is measured
`by capturing the fluctuation of reflected light that changes due to the change in
`blood flow in the blood vesse! with a photodiode. The amplifier / filter unit 14
`converts the output current
`from the photodiode of
`the first pulse wave
`measurement unit 11 or the second pulse wave measurement unit 12 into a voltage
`by the current-voltage conversion unit, amplifies the voltage by the amplifier, and a
`high-pass filter. (For example, cut-off frequency: 0.1 Hz) and a low-pass filter (for
`example, cut-off frequency: 50 Hz), and then output to the A/ D converter 17. The A
`f BD conversion unit 17 performs 10-bit A / D conversion on the input from the
`amplifier / filter unit 14 to convert It into a digital quantity and inputs it to the
`control unit 26, The gain adjusting unit 15 calculates the amplitude of the pulse
`waveform input to the control unit 26, and controls the amplification factor of the
`amplifier / filter unit 14 based on the relationship between the amplitude and the
`set threshald value.
`
`The analysis unit 18 performs body movement amount detection based on the
`triaxial acceleration waveform input to the control unit 26 after being measured by
`the acceleration measurement unit 16 and A/D converted by the A/D conversion
`unit 17.
`. Further, as the awakening / sleep determination at the end of the
`measurement, it is determined whether or not the subject is awake based on the
`body movementdata, and the sleep time is calculated. Further, the analysis unit 18
`performs measurement with the first pulse wave measurement unit 11 or the
`second pulse wave measurement unit 12, performs A/D conversion with the A/D
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`conversion unit 17 via the amplifier / filter unit 14, and inputs the result to the
`contral unit 26. The pulse wave interval data is detected for the pulse wave
`waveform thus obtained.
`
`[0034] Further, the analysis unit 18 obtains the amount of body movementfrom the
`acceleration data in the three-axis directions acquired from the acceleration
`measurement unit 16, further performs awakening / sleep determination based on
`the amount of body motion, and based on the result of the awakening / sleep
`determination, After the start of measurement, the time at which the transition
`
`from awakening ta sleep is detected as the sleep onset time, and the time at which
`the transition from the awakening to sleep after going back to the end of the
`measurement is detected as the awakening time.
`
`the analysis unit 18 samples pulse wave data from the pulse wave
`Further,
`measured by the first pulse wave measurement unit 11 or the second pulse wave
`measurement unit 12, and acquires pulse interval data frarn the series of pulse
`wave data. And stored in the data storage unit 19.
`
`The communication unit 16 is a part that performs data communication with a
`personal computer, a PDA terminal, a mobile phone, or the like.
`If the device 10
`measures and accumulates data for sleeping on multiple days and the free space in
`the data storage unit 19 decreases, for example, the USB port of the personal
`computer is connected to the USB port of the personal computer using the USB
`cable. By connecting, data is saved in a hard disk on a personal computer in a
`format that can be analyzed with the specified analysis software, and analyzed with
`the analysis software.
`
`[0037] The power supply of the biological information measuring apparatus 10 of
`the present embodimentis always ON, and when the biological measurementis not
`performed, the internal clock is greatly reduced to reduce power consumption, and
`only the time display is performed as in a normal wristwatch. Do. When performing
`biometric measurement, the operation unit 21 switches the mode to the biometric
`measurement mode. In addition, the sleep time display and the like are displayed
`by setting the result mode. The communication mode is switched by connecting a
`USB cable to the communication unit 23 and connecting to an external device via
`USB. Since charging is performed using the power line of the USB cable, charging is
`performed simultaneously in the communication mode.
`
`[0038] Modes that can be set by the operation unit 21 include a time mode, a
`biological measurement mode, and a result display mode. The display information
`of the display unit 20 includes date, pulse rate, time, pulse wave level meter,
`memory accumulation amount, battery remaining amount, communication display
`as each status, and a heart symbol blinking in synchronization with the pulse. .
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`The battery voltage monitoring unit 25 monitors the power supply voltage from the
`capacity-voltage characteristics of the battery 24 to obtain and display the
`remaining battery level.
`
`[0040] As described above, the first pulse wave measurement unit 11 and the
`second pulse wave measurement unit 12 use a photoelectric pulse wave sensor
`configured by a combination of a fight emitting diode (LED) and a photodiode (PD).
`ing. In this photoelectric pulse wave sensor, a pulse wave is detected by irradiating
`the inside of the skin with light from an LED and capturing the intensity of reflected
`light
`that changes with blood flow change by PD by the light absorption
`characteristics of hemoglobin.
`
`[6041] The first pulse wave measurement unit 11 is disposed on the lower surface
`of the casing of the biological
`information measurement device 10, but
`it
`is
`necessary to make a firm contact with the skin in order to measure the pulse wave
`accurately and stably. lf the shape of the lower surface of the apparatus housing is
`flat, the human wrist is not flat, and the contact state of the pulse wave sensor with
`the skin is not stable. Therefore, in the biological information measuring apparatus
`10 of the present embodiment, as shown in detail in FIG. 2, the shape of the lower
`surface of the apparatus housing is made concave so that the contact state with the
`skin can be maintained well overall.
`. However, since a space may be generated
`between the skin and the first pulse wave measurement unit 11 simply by making it
`concave, a transparent window composed of a convex curved surface and a plane is
`installed near the center, The first pulse wave measurement unit 11 is disposed at
`that position.
`If it does in this way, the whole apparatus housing | casing can
`closely_contact | adhere to a wrist and the Ist pulse wave measurement part 11
`can be made to contact skin stably.
`
`is
`[0042] In consideration of the ease of processing the housing and the like, it
`desirable that the concave surface on the lower surface of the housing 100 be an
`analytical curved surface. For example, a cylindrical concave surface as shown in
`FIG, 3, a conical concave surface as shown in FIG. 4, and an elliptical spherical
`concave surface as shown in FIG. 5 are desirable. Further, the position where the
`convex transparent sensor window, that is, the first pulse wave measurement unit
`11 is provided is assumed to be attached toe the wrist when the device 10 is
`arranged at the center of the lower surface of the housing 100. In other words, it
`hits the position of the long palmar muscle tendon of the user, the contact state is
`not stable, and is greatly affected by the movement of the wrist, Therefore, the
`position where the first pulse wave measurement unit 11 is provided is shifted from
`the central part of the lower surface of the apparatus housing 100 in the bending
`direction (the circumferential direction of the wrist to be worn or the belt direction)
`
`so that the influence can be reduced. | have to. Further, the Jang palmar tendon of
`the user's wrist is positioned in the gap formed by the convex curved surface of the
`first pulse wave measurement unit 11 and the concave surface of the casing 100,
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`and the casing 100 is belted by the long palmar muscle tendon. Shifting in the
`direction can be suppressed, and the apparatus 10 can be stably mounted.
`Furthermore, as shown by an imaginary line in FIG. 3, in order to further improve the
`stable wearability, the ridge 111 is arranged so that the long palmar tendon is
`sandwiched between the first pulse wa