Biometric data measurement system

Abstract

A biological data measurement system (1) comprises an annular biological sensor (2) and a portable control unit (3), which can communicate with each other. The portable control unit (3) (control unit (34)): determines (grip determination) whether the portable control unit (3) is being gripped by a hand on which the annular biological sensor (2) is worn, such determination being in accordance with the state of short-range wireless communication with the annular biological sensor (2); determines (posture determination) whether the measured posture of a user is suitable, on the basis of the position of the user's face in an image as recognized from the image and the tilt of the portable control unit (3) relative to the vertical direction; controls, on the basis of a grip determination result and a posture determination result, the biological data measurement system (1), and acquires biological data including blood pressure.

Description

[Technical field]

[0001] The present invention relates to a biological data measurement system. [Background technology]

[0002] If the blood pressure measurement site is located higher than the heart, the measured blood pressure will be lower by the hydrostatic pressure difference in the blood vessels due to gravity. Conversely, if the blood pressure measurement site is located lower than the heart, the measured blood pressure will be higher by the hydrostatic pressure difference in the blood vessels. More specifically, if the blood pressure measurement site is moved up or down by 1 cm from the heart, the blood pressure (measured value) will change by approximately 0.7 mmHg.

[0003] Here, Patent Document 1 discloses an electronic blood pressure monitor including a camera having a predetermined imaging range, performing imaging operation during blood pressure measurement and outputting image data, a face and cuff detection unit detecting whether or not a captured image indicated by the image data includes a face image and a cuff image based on the image data, a position information calculation unit calculating position information of the face image and the cuff image in the captured image, an irregularity determination unit performing a process of determining whether or not the use state of the electronic blood pressure monitor is appropriate based on the relative positional relationship indicated by the calculated positional information of the face image and the cuff image, and an output unit outputting the result of the determination by the irregularity determination unit. According to this electronic blood pressure monitor, whether or not the use state of the electronic blood pressure monitor is appropriate is determined based on the relative positional relationship between the face image and the cuff image in the captured image during blood pressure measurement, so that it is possible to detect whether or not the use mode of the electronic blood pressure monitor is appropriate (in terms of measurement accuracy).

[0004] Patent Document 2 also proposes a device that includes a blood pressure sensor that acquires a blood pressure measurement value from a user holding the device in his / her hand, and a control unit that determines the angle of the device with respect to the direction of gravity, identifies one or more positions of the user holding the device in his / her hand relative to a displayed predetermined position range in a display image of the user, determines the height of the blood pressure sensor relative to the height of the user's heart based on the angle of the device with respect to the direction of gravity and the one or more positions of the user in the image relative to the predetermined position range, and controls based on the height of the blood pressure sensor relative to the height of the user's heart. According to this device, the device can be controlled to measure blood pressure based on the height of the blood pressure sensor relative to the height of the user's heart. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-247733 A [Patent Document 2] Special Publication No. 2020-500052 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the electronic blood pressure monitor disclosed in Patent Document 1 is invasive because it uses a cuff to tighten the upper arm when measuring blood pressure. In addition, the use of a cuff makes the device (electronic blood pressure monitor) large in size and unsuitable for portability. Therefore, for example, it cannot be used (to measure blood pressure) when away from home.

[0007] On the other hand, in the device disclosed in Patent Document 2, the device is held in the hand and the fingers of the hand are brought into contact with the blood pressure sensor to measure blood pressure, making it difficult to keep the contact pressure constant. If the contact pressure changes, the blood pressure at the contacting measuring part will fluctuate (this may occur between measurements, but contact pressure fluctuations are particularly likely to occur during measurement), which may make it difficult to stably measure blood pressure.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a biometric data measurement system that is highly portable and capable of more accurately and non-invasively measuring biometric data, including blood pressure, whose measured values ​​are affected by the difference between the height of the measurement site and the height of the heart (i.e., affected by hydrostatic pressure). [Means for solving the problem]

[0009] The biometric data measurement system according to the present invention is a biometric data measurement system comprising an annular biometric sensor and a portable control unit configured to be capable of communicating with each other, in which the annular biometric sensor has a main body section formed in a ring shape so as to be wearable on a finger or wrist, a sensor section provided on the main body section and measuring biometric data including blood pressure, and a sensor-side short-range wireless communication section capable of communicating with the portable control unit when the portable control unit is within a predetermined range, and the portable control unit has an imaging section that captures images, a display section that presents an image of the user's face to a user holding the portable control unit in the hand in which the annular biometric sensor is attached and displays the image captured by the imaging section, and a vertical direction of the portable control unit. The device is characterized by having an inclination sensor that detects tilt, a unit-side short-range wireless communication unit that is capable of communicating with the annular biosensor when the annular biosensor is within a predetermined range, and a control unit that determines whether the portable control unit is being held in the hand in which the annular biosensor is attached depending on the wireless communication state with the annular biosensor, and determines whether the user's measurement posture is appropriate from the position of the user's face in the image recognized from the image and the tilt of the portable control unit relative to the vertical direction, and controls the biodata measurement system and acquires biodata including blood pressure based on the determination result of whether the portable control unit is being held in the hand in which the annular biosensor is attached and the determination result of whether the user's measurement posture is appropriate.

[0010] According to the biometric data measurement system of the present invention, since the annular biosensor having a sensor unit formed in a ring shape is attached to a finger or a wrist, the contact pressure (pressure) with the measurement site is stable, and biometric data including blood pressure can be measured with high accuracy. In addition, whether or not the portable control unit is held by the hand on which the annular biosensor is attached is determined according to the state of wireless communication with the annular biosensor, and whether or not the user's measurement posture is appropriate is determined from the position of the user's face in the image recognized from the image and the inclination of the portable control unit relative to the vertical direction. Therefore, the relative position between the portable control unit and the face can be estimated from the position of the user's face in the image and the inclination of the portable control unit, and the height of the portable control unit (the annular biosensor attached to the hand holding the portable control unit) from the heart can be estimated. Then, the biometric data measurement system is controlled (biometric data including blood pressure is measured) based on the determination result of whether or not the portable control unit is held by the hand on which the annular biosensor is attached and the determination result of whether or not the user's measurement posture is appropriate, so that biometric data including blood pressure can be measured with high accuracy. Furthermore, since no cuff is used, the device is highly portable and can measure biological data including blood pressure non-invasively. Effect of the Invention

[0011] The present invention is highly portable and enables more accurate and non-invasive measurement of biological data including blood pressure, whose measured value is affected by the difference between the height of the measurement site and the height of the heart (i.e., affected by hydrostatic pressure). [Brief description of the drawings]

[0012] [Figure 1] 1 is a diagram showing an overall configuration of a biological data measurement system according to an embodiment; [Diagram 2] 1 is a block diagram showing a functional configuration of a biological data measurement system according to an embodiment. [Diagram 3] FIG. 2 is a diagram showing the arrangement of a sensor-side short-range wireless communication unit and a photoplethysmographic sensor (light-emitting element, light-receiving element) in an annular biosensor. [Figure 4] 1A to 1C are diagrams showing the state in which the annular biosensor is attached and the state in which the portable control unit is held when measuring blood pressure, etc.; [Diagram 5] FIG. 13 is a diagram showing the inclination of a portable control unit. [Figure 6] 11A and 11B are diagrams illustrating examples of display of a recommended range of a face display position and a face display size. [Figure 7] 11 is a diagram for explaining a method for determining the difference in height between the annular biosensor and the user's heart. FIG. [Figure 8] FIG. 13A is a diagram showing an example image in which only the trunk is tilted to the right, and FIG. 13B is a diagram showing an example image in which the trunk and the portable control unit are tilted to the right in the same manner. [Figure 9] 11A and 11B are diagrams illustrating a method for measuring the inclination of a user's trunk. [Figure 10] 5 is a flowchart showing a processing procedure of a blood pressure measurement process using the annular biosensor constituting the biodata measurement system according to the embodiment. [Figure 11] 5 is a flowchart showing a processing procedure of a blood pressure measurement process, etc., performed by a portable control unit constituting the biological data measurement system according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals will be used for the same or corresponding parts. In each drawing, the same reference numerals will be used for the same elements, and duplicated explanations will be omitted.

[0014] First, the configuration of a biological data measurement system 1 according to an embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a diagram showing the overall configuration of the biological data measurement system 1. Fig. 2 is a block diagram showing the functional configuration of the biological data measurement system 1. Fig. 3 is a diagram showing the arrangement of a sensor-side short-range wireless communication unit 231 and a photoplethysmographic sensor 22 (light-emitting element 221, light-receiving element 222) in the annular biological sensor 2.

[0015] The biological data measurement system 1 is mainly composed of an annular biological sensor 2 connected to each other via wireless communication so as to be able to communicate with each other, and a portable control unit 3. In particular, the biological data measurement system 1 has excellent portability and a function of more accurately and non-invasively measuring biological data including blood pressure, whose measured value is affected by the difference between the height of the measurement site and the height of the heart (i.e., affected by hydrostatic pressure).

[0016] The annular biosensor 2 mainly includes a main body 21 formed in an annular shape (ring-shaped or wristband-shaped) so as to be wearable on a finger or wrist, a sensor unit 22 provided on the inner surface of the main body 21 and for measuring (detecting) at least blood pressure, a sensor-side short-range wireless communication unit 231 capable of communicating with the portable control unit 3 when the portable control unit 3 is within a predetermined range, a sensor-side communication unit 232 having a wider communication range than the sensor-side short-range wireless communication unit 231 and for transmitting and receiving data (measurement data, control data, etc.) with the portable control unit 3, a determination unit 24 for determining whether the annular biosensor 2 is worn, and an acceleration sensor 25 for detecting body movement. In addition, the annular biosensor 2 preferably includes a temperature sensor for detecting body surface temperature.

[0017] The portable control unit 3 mainly comprises an imaging section 31 that captures images (still images or moving images), a display section 32 that presents (displays) an image of the user's face when the user is holding the portable control unit 3 in the hand in which the annular biosensor 2 is attached, and displays the image captured by the imaging section 31, a unit-side short-range wireless communication section 331 that is capable of communicating with the annular biosensor 2 when the annular biosensor 2 is within a predetermined range, a unit-side communication section 332 that has a wider communication range than the unit-side short-range wireless communication section 331 and transmits and receives data (control data, measurement data, etc.) to and from the annular biosensor 2, and a display section 334 that displays the image of the user's face when the user is holding the portable control unit 3 in the hand in which the annular biosensor 2 is attached, depending on the state of short-range wireless communication between the unit-side short-range wireless communication section 331 and the annular biosensor 2. The annular biosensor 2 has a control unit 34 that determines whether the user is holding the portable control unit 3 in the hand with the annular biosensor 2 attached (grasping determination), and determines whether the user's measurement posture is appropriate (posture determination) based on the position of the user's face in the image recognized from the image and the inclination of the portable control unit 3 with respect to the vertical direction, and controls the imaging unit 31, display unit 32, unit-side short-range wireless communication unit 331, unit-side communication unit 332, and the annular biosensor 2 based on the determination result of whether the portable control unit 3 is being held in the hand with the annular biosensor 2 attached (grasping determination result) and the determination result of whether the user's measurement posture is appropriate (posture determination result) to obtain biodata (biometric information) including blood pressure, and an inclination sensor (or acceleration sensor) 35 that detects the inclination of the portable control unit 3 with respect to the vertical direction.

[0018] As the portable control unit 3 which is the control terminal, for example, a portable terminal such as a smartphone can be suitably used. In this embodiment, a smartphone is used as the portable control unit 3. Each component will be described below.

[0019] The main body 21 of the annular biosensor 2 is formed in a ring shape (ring type) so that it can be attached to a finger of the hand. Alternatively, the main body 21 is formed in a ring shape (wristband type) so that it can be attached to a wrist. In this embodiment, the annular biosensor 2 is described as an example of a ring-shaped biosensor attached to a finger of the hand. The annular biosensor 2 is attached to, for example, the index finger of one hand (the right hand in the example of Figs. 4 to 7). However, the finger on which the annular biosensor 2 is attached may be the middle finger, ring finger, little finger, or thumb. The portable control unit 3 is held by the hand on which the annular biosensor 2 is attached (the right hand in the example of Figs. 4 to 7).

[0020] Sensor unit 22 is, for example, a photoplethysmographic sensor that includes a light-emitting element (light-emitting unit) 221 and a light-receiving element (light-receiving unit) 222 and detects a photoplethysmographic signal. The photoplethysmographic sensor optically measures pulse rate and the like by utilizing the light absorption characteristics of hemoglobin in the blood. Hereinafter, sensor unit 22 may also be referred to as photoplethysmographic sensor 22. Sensor unit (photoplethysmographic sensor) 22 is provided on the inner surface of main body unit 21.

[0021] Moreover, it is preferable that the sensor unit (photoplethysmography sensor) 22 is arranged in the main body 21 so as to be (located) on the pad side of the finger when the annular biosensor 2 is worn on the user's finger. This is because a pulse wave sensor including the photoplethysmography sensor 22 can more easily obtain a biosignal from the pad side of the finger than from the dorsal side of the finger. As shown in FIG. 3, if the sensor-side short-range wireless communication unit 231 is arranged on the pad side of the finger and overlaps with the sensor unit (photoplethysmography sensor) 22, the sensor unit (photoplethysmography sensor) 22 may be shifted and arranged so that it is on the side of the finger.

[0022] The sensor unit 22 measures (detects) at least blood pressure. In this embodiment, a blood pressure sensor that estimates blood pressure from a photoelectric pulse waveform will be described as an example. A known method (see, for example, JP 2016-16295 A) can be used to estimate blood pressure from a photoelectric pulse waveform. That is, the annular biosensor 2 is a so-called cuffless sphygmomanometer that does not use a cuff. Note that other blood pressure estimation techniques (methods) using pulse wave transit time, etc. may also be used.

[0023] However, in either method, the blood pressure measurement obtained may be inaccurate due to the influence of hydrostatic pressure. To avoid the influence of hydrostatic pressure, blood pressure measurement needs to be performed at or near the height of the user's heart. If blood pressure measurement is performed above the height of the heart, the measurement result will be too low, and if blood pressure measurement is performed below the height of the heart, the measurement result will be too high. If the difference between the blood pressure measurement position and the height of the heart is 10 cm, 7 to 8 mmHg will be erroneously introduced into the blood pressure measurement. In other words, if blood pressure is measured with a finger while the arm is hanging down, a difference in height of about 50 cm will occur, resulting in an error of 35 to 40 mmHg. When blood pressure is measured by a general user who is not trained, such as a medical professional, the blood pressure measurement is often performed at a height significantly different from the height of the user's heart, causing an error in the blood pressure measurement. Even in the method of estimating blood pressure from a photoelectric pulse waveform measured with a finger, it is necessary to minimize or eliminate the influence of static pressure in order to perform an accurate blood pressure measurement.

[0024] Also, a known method (see, for example, Patent Application No. 2017-506158) can be used to estimate the blood glucose level from the photoelectric pulse waveform. However, the photoelectric pulse waveform is also affected by the blood pressure value at that time, and therefore also affects the estimated blood glucose level. Therefore, even with a blood glucose sensor, it is necessary to take an appropriate measurement posture to limit the influence of blood pressure. In addition, blood pressure may increase when the abdomen is compressed, such as leaning forward, but pulse and respiration may also change depending on the posture, so it may be necessary to take an appropriate measurement posture. The photoelectric pulse waveform also contains information on vascular resistance. When determining vascular resistance, since the photoelectric pulse waveform is also affected by blood pressure, variability can be reduced by measuring at the height of the heart. Although vascular resistance has been given as an example, the same applies when estimating blood flow rate, blood glucose level, and arteriosclerosis from the waveform. In addition, since the measurement posture affects the pulse rate, blood flow rate, body surface temperature, and respiration itself, measurement variability can be reduced by performing the measurement in a fixed posture. Here, the measured biological data (biological information) may include, in addition to blood pressure, for example, pulse wave, pulse rate, oxygen saturation, blood glucose level, body surface temperature, activity level, vascular resistance, blood flow rate, arteriosclerosis level, respiration, etc. In this way, by simultaneously measuring multiple biological data (information), it becomes possible to estimate the state of physical condition, signs of illness, etc.

[0025] When the portable control unit 3 is within a predetermined range, the sensor-side short-range wireless communication unit 231 performs short-range wireless communication to enable communication with the portable control unit 3. For example, the sensor-side short-range wireless communication unit 231 is composed of an NFC (Near Field Communication) module. When the portable control unit 3 incorporating a unit-side short-range wireless communication unit 331 (details of which will be described later) is held by a hand on which the annular biosensor 2 incorporating the sensor-side short-range wireless communication unit (NFC module) 231 is worn, the annular biosensor 2 (sensor-side short-range wireless communication unit 231) and the portable control unit 3 (unit-side short-range wireless communication unit 331) come close to each other, enabling short-range wireless communication (NFC communication) between them.

[0026] As shown in FIG. 3, the sensor-side near-field wireless communication unit 231 is arranged in the main body 21 so as to be (positioned) on the pad side of the finger when the annular biosensor 2 is worn on the user's finger. FIG. 3 is a diagram showing the arrangement of the sensor-side near-field wireless communication unit (NFC module) 231 and the photoelectric pulse wave sensor 22 (light-emitting element 221, light-receiving element 222) when viewed from the axial direction of the annular biosensor 2 (and the tip side of the finger). When the portable control unit 3 is held by a hand wearing the annular biosensor 3, the palm side of the hand comes into contact with the portable control unit 3. At that time, when the sensor-side near-field wireless communication unit (NFC module) 231 comes to the back side of the finger, communication with the portable control unit 3 is performed by pinching the finger. Since the living body (finger) absorbs electromagnetic waves, such a layout is affected by the finger. On the other hand, by making the sensor-side near-field wireless communication unit (NFC module) 231 come to the pad side of the finger, it is less affected by the finger, and the communication state can be made more stable.

[0027] The sensor side communication unit 232 adopts a wireless communication method (wireless communication standard) having a wider communication range than NFC, and transmits and receives data (measurement data, control data, etc.) to and from the portable control unit 3. Here, in this embodiment, Bluetooth (registered trademark) is adopted as the wireless communication standard. That is, the sensor side communication unit 232 has a transmission function and a reception function based on Bluetooth (registered trademark). Note that the wireless communication standard used is not limited to Bluetooth (registered trademark), and other standards may be used. More specifically, the sensor side communication unit 232 transmits mounting state information (details will be described later) of the annular biosensor 2 to the portable control unit 3. On the other hand, the sensor side communication unit 232 receives a measurement (start) command transmitted from the portable control unit 3. Then, the sensor side communication unit 232 transmits the acquired biodata such as blood pressure to the portable control unit 3 (at a predetermined timing (or period)).

[0028] The determination unit 24 determines whether the annular biosensor 2 is attached to a finger (or wrist). If posture determination (described in detail later) is performed when the annular biosensor 2 is not attached, there is a risk of erroneously determining that a posture is appropriate when it is not, but such a problem can be avoided by performing posture determination only when the annular biosensor 2 is attached.

[0029] Here, as a method for determining whether the annular biosensor 2 is worn, it is preferable to determine whether a pulse wave is detected by the photoelectric pulse wave sensor 22. This is because there is a low possibility of erroneously determining that the annular biosensor 2 is worn even though it is not worn on the finger. However, since it is necessary to measure two or more beats in order to determine that it is a pulse wave, it may take more than three seconds. Therefore, it may be determined whether the amount of light received by the photoelectric pulse wave sensor 22 exceeds a threshold value. If the photoelectric pulse wave sensor 22 is a reflective type, the amount of light received will be low if the sensor is not worn, so it is considered that the sensor is not worn if it falls below the threshold value. If the photoelectric pulse wave sensor 22 is a transmissive type, the amount of light received will be high if the sensor is not worn, so it is considered that the sensor is not worn if it exceeds the threshold value. This method allows for a determination in a short time. However, there is a risk that any object that blocks light will be determined to be worn (i.e., erroneously determined) even if it is inserted into the annular biosensor 2. Therefore, the configuration for determining whether or not the annular biosensor 2 is attached to a finger may be combined with a method for determining that the annular biosensor 2 is not attached when no movement is detected by the acceleration sensor 25, gyro sensor, etc., or a method for providing a temperature sensor for detecting body surface temperature and determining that the annular biosensor 2 is not attached when the detected temperature is below a predetermined value.

[0030] The result of the determination by the determination unit 24 is sent from the sensor side communication unit 232 to the portable control unit 3. The control unit 34 of the portable control unit 3 prohibits the determination of the user's posture (details will be described later) when the annular biosensor 2 is not attached to a finger or wrist.

[0031] The acceleration sensor 25 detects the acceleration of the annular biosensor 2, i.e., the body movement of the user wearing the annular biosensor 2. The detection result by the acceleration sensor 25 is also sent from the sensor side communication section 232 to the portable control unit 3.

[0032] On the other hand, the imaging section (camera) 31 of the portable control unit 3 captures an image (a still image or a moving image). The imaging section 31 is provided on the surface of the portable control unit 3 on the display section 32 side. As shown in Figs. 4 to 7, the imaging section 31 captures an image of, for example, the face of a user holding the portable control unit 3 with one hand (e.g., the right hand) on which the annular biosensor 2 is attached.

[0033] The display unit 32 is, for example, an LCD display, etc. The display unit 32 displays (notifies), for example, the following images and information (1) to (5). (1) The display unit 32 displays (notifies) the user to hold the portable control unit 3 in the hand in which the annular biosensor 2 is attached. (2) The display unit 32 displays (presents) to the user that an image of the user's face should be captured by the portable control unit 3 so that the user's face fits within the frame. (3) The display unit 32 displays the images (still images or moving images) captured by the imaging unit 31 in real time. The display unit 32 also graphically displays (presents) the recommended range of the face display position and face display size. More specifically, as shown in FIG. 6, the display unit 32 superimposes a figure such as an approximate ellipse or rectangle representing the appropriate face position and size. In this way, by graphically displaying the appropriate range of the face display position and face display size on the display unit 32 (display), the user can easily recognize the appropriate range. Therefore, the user can easily correct the position and size of the displayed face by himself or herself. (4) When the control unit 34 of the portable control unit 3 recognizes the user's face in the image, the display unit 32 notifies (displays) whether the display position and size of the face are within the recommended range. In this way, both the actual face position and size in the image and the face position and size within an appropriate range are displayed, making it easy for the user to make corrections. Note that, although it is preferable to set the standard for the face height at eye height, the accuracy of estimating the relative positions of the face and the heart can be improved if the eye position is also automatically determined during automatic face determination. (5) The display unit 32 displays (notifies) the user to adjust the trunk of the user so that it is in the vertical direction (appropriate measurement posture), and prompts the user to make an adjustment.

[0034] When the annular biosensor 2 is within a predetermined range, the unit-side short-range wireless communication unit 331 performs short-range wireless communication to enable communication with the annular biosensor 2. For example, the unit-side short-range wireless communication unit 331 is composed of an NFC (Near Field Communication) module. Therefore, by holding the portable control unit 3 incorporating the unit-side short-range wireless communication (NFC module) 331 with a hand on which the annular biosensor 2 incorporating the sensor-side short-range wireless communication (NFC module) 231 is worn, the annular biosensor 2 (sensor-side short-range wireless communication 231) and the portable control unit 3 (unit-side short-range wireless communication 331) come close to each other, enabling short-range wireless communication (NFC communication) between them.

[0035] Therefore, the control unit 34 of the portable control unit 3 judges whether the portable control unit 3 is held in the hand on which the annular biosensor 2 is attached, depending on whether NFC communication (near-field wireless communication) is possible with the annular biosensor 2. That is, the control unit 34 of the portable control unit 3 judges that the portable control unit 3 is held in the hand on which the annular biosensor 2 is attached when NFC communication (near-field wireless communication) is possible with the annular biosensor 2. On the other hand, the control unit 34 of the portable control unit 3 judges that the portable control unit 3 is not held in the hand on which the annular biosensor 2 is attached when NFC communication with the annular biosensor 2 is not possible. In this way, by using NFC, it is possible to easily judge whether the annular biosensor 2 is attached to the hand holding the portable control unit 3. In addition, it is possible to prevent an erroneous measurement of a blood pressure value or the like when the annular biosensor 2 is not attached.

[0036] Each of the sensor-side short-range wireless communication unit 231 and the unit-side short-range wireless communication unit 331 may be configured to include a Bluetooth (registered trademark) module instead of an NFC module. In this case, the control unit 34 of the portable control unit 3 determines whether the portable control unit 3 is held by the hand to which the annular biosensor 2 is attached, depending on whether the received signal strength of the radio wave transmitted from the annular biosensor 2 is equal to or greater than a predetermined value.

[0037] Since Bluetooth (registered trademark) generally allows communication even at a distance of 10 m or more, whether the portable control unit 3 is held by the hand wearing the annular biosensor 2 cannot be determined only by whether communication is possible. Therefore, when the received signal strength (RSSI) at the portable control unit 3 is equal to or greater than a predetermined value, it is determined that the portable control unit 3 is held by the hand wearing the annular biosensor 2. However, the value of RSSI varies greatly depending on the environment, obstacles, etc. Therefore, if the sensor-side short-range wireless communication unit 231 is placed on the back side of the finger, communication will occur through the finger, and there is a risk that the RSSI will not be stable due to the influence of the size of the finger (individual differences) and how it is worn. Therefore, in order to stabilize the communication state, it is desirable to place the sensor-side short-range wireless communication unit 231 (Bluetooth (registered trademark) module) on the main body unit 21 so that it is on the pad side of the finger when the annular biosensor 2 is worn on the finger.

[0038] In this case, by using Bluetooth (registered trademark) modules as the sensor side short-range wireless communication unit 231 and the unit side short-range wireless communication unit 331, the Bluetooth (registered trademark) module alone can be responsible for both determining whether the portable control unit 3 is being held by the hand in which the annular biosensor 2 is attached and for data communication (i.e., it can perform both functions).

[0039] The unit side communication unit 332 employs a wireless communication method (wireless communication standard) having a wider communication range than NFC, and transmits and receives data (control data (commands) and measurement data, etc.) between the unit side communication unit 332 and the annular biosensor 2 (sensor side communication unit 232). As described above, in this embodiment, Bluetooth (registered trademark) is employed as the wireless communication standard. That is, the unit side communication unit 332 has a transmission function and a reception function based on Bluetooth (registered trademark). More specifically, the unit side communication unit 332 transmits a measurement (start) command to the sensor side communication unit 232. Meanwhile, the unit side communication unit 332 receives mounting state information transmitted from the annular biosensor 2. The unit side communication unit 332 also receives biodata such as blood pressure transmitted from the annular biosensor 2.

[0040] The control unit 34 determines whether the portable control unit 3 is held by the hand on which the ring-shaped biosensor 2 is attached (holding determination) according to the state of wireless communication with the ring-shaped biosensor 2, and determines whether the user's measurement posture is appropriate from the position of the user's face in the image recognized from the image and the inclination of the portable control unit 3 relative to the vertical direction (posture determination), and controls the imaging unit 31, the display unit 32, the unit-side near-field wireless communication unit (NFC module) 331, the unit-side communication unit 332, and the ring-shaped biosensor 2 based on the determination result of whether the portable control unit 3 is held by the hand on which the ring-shaped biosensor 2 is attached (holding determination result) and the determination result of whether the user's measurement posture is appropriate (posture determination result), to obtain biodata (biological information) including blood pressure. For this reason, the control unit 34 is mainly configured to have a microprocessor that performs calculations, an EEPROM that stores programs and the like for causing the microprocessor to execute each process, a RAM that temporarily stores data, and an external interface (I / F), etc. Each function of the control unit 34 is realized by a microprocessor executing a program stored in an EEPROM or the like.

[0041] The control unit 34 statistically estimates the size of the face and the distance between the face and the heart from the height. Next, the control unit 34 calculates the distance between the face and the portable control unit 3 from the size of the face. Next, if the user's trunk is not tilted, the control unit 34 regards the distance between the face and the heart as the difference in height between the face and the heart. Then, the control unit 34 calculates the difference in height between the portable control unit 3 (annular biosensor 2) and the heart based on the difference in height between the face and the heart and the distance between the face and the portable control unit 3.

[0042] More specifically, the control unit 34 statistically estimates the relative positions of the face and the heart from the height. However, since the relative positions are shifted when the trunk is bent significantly, such as when leaning forward, it is assumed here that the trunk is not tilted in a sitting position. For example, since the "AIST Human Body Dimension Database 1991-1992" does not contain data on the height of the heart, in this embodiment, data on the nipple height is used instead. The difference in height between the face and the heart can be statistically obtained by substituting B2 medial canthus height - B6 nipple height. The control unit 34 estimates, for example, the difference between the eyes (medial canthus height) and the nipples (nipple height) (see FIG. 7) from statistical data based on the size of the face in the image (total head height).

[0043] As described above, when a face is displayed at a predetermined position on the display unit (display) 32, the direction in which the face is located is determined from the imaging unit (camera) 31 of the portable control unit 3. When a face is displayed at a predetermined size on the display unit 32, the distance between the portable control unit 3 and the face (see FIG. 7) can be estimated. However, since the size of a face varies from person to person, the accuracy of estimating the distance between the portable control unit 3 and the face can be improved by statistically estimating the size of the face from the user's physical information (e.g., height, weight, etc.). The user's physical information (height, etc.) may be read out from a memory or server that has been previously input by the user into the portable control unit 3, or data such as a medical examination data stored on a server may be read out.

[0044] As described above, the size of the face can be estimated, and once the face is at a predetermined position and size on the display unit 32, the relative position of the portable control unit 3 with respect to the face is determined. The inclination of the portable control unit 3 is obtained from the inclination sensor (acceleration sensor) 35. The absolute position of the portable control unit 3 with respect to the face is determined from the relative position of the portable control unit 3 with respect to the face and the inclination of the portable control unit 3 (because the vertical direction is determined). With the holding method shown in FIG. 4, the relative position of the portable control unit 3 and the annular biosensor 2 is such that the annular biosensor 2 is approximately near the center of the back side of the portable control unit 3. Since the vertical direction can be determined from the inclination of the portable control unit 3, the absolute position of the portable control unit 3 and the annular biosensor 2 can be estimated.

[0045] If the user's trunk is not tilted, the distance between the face and the heart can be regarded as the difference in height between the face and the heart, and therefore the control unit 34 determines the difference in height between the annular biosensor 2 and the heart based on the difference in height between the face and the heart, the absolute position between the face and the portable control unit 3, and the absolute position between the portable control unit 3 and the annular biosensor 2. That is, the control unit 34 determines the difference in height between the portable control unit 3 and the heart based on the difference in height between the face and the heart, the distance between the face and the portable control unit 3, and the inclination of the portable control unit 3 (see FIG. 7), and further determines the difference in height between the annular biosensor 2 and the heart based on the absolute position between the portable control unit 3 and the annular biosensor 2.

[0046] Incidentally, the left-right inclination of the user's trunk can be estimated from the left-right inclination of the face in the image and the left-right inclination of the portable control unit 3. If the left-right inclination exceeds a predetermined range, the user is notified via the display unit 32 or the like. FIG. 8(a) shows an example image in which only the trunk is inclined to the right. FIG. 8(b) shows an example image in which the trunk and the portable control unit 3 are inclined to the right in the same manner.

[0047] The portable control unit 3 has an inclination sensor (or acceleration sensor) 35 that detects the inclination of the portable control unit 3 with respect to the vertical direction. Based on the inclination of the portable control unit 3 with respect to the vertical direction detected by the inclination sensor 35, the control unit 34 determines whether or not the inclination of the user's trunk with respect to the vertical direction and the left-right direction is within a predetermined range.

[0048] In addition, the forward / backward inclination of the user's torso can be grasped by detecting the inclination of the portable control unit 3 with respect to the vertical direction when the portable control unit 3 is in close contact with the user's torso using an inclination sensor (acceleration sensor) 35, as shown in FIG.

[0049] At this time, the control unit 34 of the portable control unit 3 determines whether or not the inclination of the user's trunk (in the vertical direction and the front-to-rear direction) is within a predetermined range, based on the acquired (detected) inclination of the portable control unit 3 with respect to the vertical direction. Then, the display unit 32 of the portable control unit 3 displays the result of the determination by the control unit 34. In this case, the portable control unit 3 is brought into close contact with the trunk, and the inclination of the portable control unit 3 at that time is measured, so that the inclination of the trunk from the vertical direction can be determined, and the user can be notified that he or she is leaning forward or arching back, allowing the user to correct it himself or herself.

[0050] The control unit 34 of the portable control unit 3 determines that the user's measurement posture is not appropriate if the difference in height between the annular biosensor 2 and the user's heart is outside a predetermined range, and if the inclination of the user's trunk relative to the vertical direction is outside a predetermined range. The inclination of the trunk relative to the vertical direction causes the estimated value of the height of the face and the heart to deviate. By determining whether the inclination is outside the predetermined range, it is possible to know whether the measured blood pressure value deviates from the true value.

[0051] If the user is leaning forward or leaning back (leaning backward) during measurement, the relative positional relationship between the face and the heart will be shifted, causing the heart height to be estimated lower than the actual heart height, reducing the accuracy of the blood pressure value. In addition, a posture that puts pressure on the abdomen, such as leaning forward, can cause blood pressure to rise. However, such leaning forward or leaning back is difficult for the user to notice. By determining the inclination of the trunk from the vertical direction, the user can be notified that they are leaning forward or leaning back, and can correct the position themselves.

[0052] As described above, it is important to measure blood pressure at heart height while at rest, so accurate blood pressure values ​​cannot be measured unless the measurement is performed in an appropriate posture. On the other hand, measuring at heart height limits the user's measurement posture, which can be difficult when continuous or regular data is required. Therefore, it is important to calculate the reliability of the measurement value and to correct it so that it is approximately equal to the blood pressure value in the case of an appropriate measurement posture. Since the blood pressure value becomes more inaccurate the more the posture deviates from the appropriate posture, by calculating the reliability of the measurement value according to the deviation from the appropriate posture, the user can handle the measurement value while taking into consideration the risk that the blood pressure measurement value deviates from the true value.

[0053] Therefore, the control unit 34 calculates the reliability of the biological data including the (measured) blood pressure based on the determination result of the inclination of the user's trunk (posture determination result). Since it is important to measure blood pressure at heart height while at rest, accurate blood pressure values ​​cannot be measured unless the measurement is performed in an appropriate posture. The more the posture deviates from the appropriate posture, the more inaccurate the blood pressure value becomes, but by calculating the reliability, the measurement value can be handled while taking into account the risk that the blood pressure measurement value deviates from the true value.

[0054] Moreover, by correcting the measured blood pressure value so that it is approximately equal to the blood pressure value in an appropriate measurement posture, it becomes even more convenient for the user. If the absolute position of the face and the portable control unit 3 can be estimated, the height difference between the annular biosensor 2 and the heart can be estimated, and the blood pressure value can be corrected to correspond to the height difference. Furthermore, the control unit 34 may correct biometric data such as blood pressure based on the determination result of the inclination of the user's trunk (posture determination result). For example, since blood pressure may be high when leaning forward, in the case of leaning forward, the estimated value may be corrected lower based on the trunk inclination and blood pressure value data acquired in advance.

[0055] If the difference in height between the annular biosensor 2 and the heart can be estimated, the blood pressure value can be corrected, but the accuracy of blood pressure estimation is improved by measuring with the annular biosensor 2 at the (vertical) height of the heart. In other words, measuring at the height of the heart every time provides more stable blood pressure accuracy than measuring at a position lower or higher than the heart. However, measuring at the height of the heart limits the user's measurement posture, which may be difficult when continuous or regular data is required (there is a risk of causing pain to the user). Therefore, by correcting the measured blood pressure value so that it is approximately equivalent to the blood pressure value in an appropriate measurement posture, it becomes possible to obtain continuous or regular data.

[0056] Next, the operation of the biological data measurement system 1 will be described with reference to Figs. 10 and 11. Fig. 10 is a flowchart showing the procedure of blood pressure measurement processing by the annular biological sensor 2 constituting the biological data measurement system 1. Fig. 11 is a flowchart showing the procedure of blood pressure measurement processing by the portable control unit 3 constituting the biological data measurement system 1. The process shown in Fig. 10 is executed repeatedly at a predetermined timing mainly by the annular biological sensor 2. The process shown in Fig. 11 is executed repeatedly at a predetermined timing mainly by the portable control unit 3.

[0057] First, the operation of the annular biosensor 2 (blood pressure measurement process) will be described with reference to Fig. 10. In step S100, it is determined whether or not the portable control unit 3 is connected by Bluetooth (registered trademark). If the portable control unit 3 is not connected, the process is temporarily terminated. On the other hand, if the portable control unit 3 is connected, the process proceeds to step S102.

[0058] In step S102, a photoelectric pulse wave signal is acquired. Then, in step S104, it is determined whether or not the annular biosensor 2 is attached to a finger based on the photoelectric pulse wave signal acquired in step S102. If the annular biosensor 2 is not attached to a finger, the process proceeds to step S102, and the above-mentioned steps S102 to S104 are repeatedly executed until the annular biosensor 2 is attached to a finger. On the other hand, if the annular biosensor 2 is attached to a finger, the process proceeds to step S106.

[0059] In step S106, information indicating that the annular biosensor 2 is attached to a finger (attachment state information) is transmitted to the portable control unit 3.

[0060] In the next step S108, it is determined whether or not communication with the portable control unit 3 is possible by near field communication (NFC). If communication with the portable control unit 3 is not possible by near field communication (NFC), the process is temporarily terminated. On the other hand, if communication with the portable control unit 3 is possible by near field communication (NFC), the process proceeds to step S110.

[0061] In step S110, acceleration data (body movement data) is acquired. Then, in step S112, the acquired acceleration data (body movement data) is transmitted to the portable control unit 3.

[0062] Next, in step S114, it is determined whether or not a measurement (start) command has been received from the portable control unit 3. If the measurement (start) command has not been received, the process proceeds to step S110, and the above-described processes of steps S110 to S114 are repeatedly executed until the measurement (start) command is received. On the other hand, if the measurement (start) command has been received, the process proceeds to step S116.

[0063] In step S116, photoelectric pulse wave data (blood pressure data) and acceleration data (body movement data) are acquired. Then, in step S118, the photoelectric pulse wave data (blood pressure data) and acceleration data (body movement data) acquired in step S116 are transmitted to the portable control unit 3. Thereafter, the process temporarily exits.

[0064] Next, the operation of the portable control unit 3 (blood pressure, etc. measurement process) will be described with reference to Fig. 11. In step S200, it is determined whether or not the ring-shaped biosensor 2 is connected via Bluetooth (registered trademark). If the ring-shaped biosensor 2 is not connected, in step S202, a connection with the ring-shaped biosensor 2 is established (paired) via Bluetooth (registered trademark), and then the process proceeds to step S204. On the other hand, if the ring-shaped biosensor 2 is connected, the process proceeds to step S204.

[0065] In step S204, it is determined whether or not information (wearing status information) indicating that the annular biosensor 2 is worn on a finger has been received from the annular biosensor 2. If the wearing status information has not been received, in step S206, information encouraging the user to wear the annular biosensor 2 is displayed (notified), and then the process proceeds to step S204, where it is determined again whether or not the wearing status information has been received. On the other hand, if the wearing status information has been received, the process proceeds to step S208.

[0066] In step S208, it is determined whether or not communication with the ring-shaped biosensor 2 is possible via near field communication (NFC). If communication with the ring-shaped biosensor 2 is not possible via near field communication (NFC), this process is repeated until communication with the ring-shaped biosensor 2 is possible via near field communication (NFC). On the other hand, if communication with the ring-shaped biosensor 2 is possible via near field communication (NFC), the process proceeds to step S210.

[0067] In step S210, an image captured by the imaging unit (camera) 31 is displayed, and information urging the user to take a picture of himself is displayed (notified).

[0068] Next, in step S212, information is displayed (notified) to the user to prompt the user to adjust the size of the face in the image and the inclination of the portable control unit 3 to within a predetermined range (appropriate range).

[0069] Next, in step S220, the acceleration data (body movement data) transmitted from the annular biosensor 2 is received (acquired). Then, in step S216, it is determined whether the measurement posture is within an appropriate range and whether the body movement is within an appropriate range. If the measurement posture and body movement are not within the appropriate range, information is displayed (notified) to the user in step S218 to prompt the user to bring the measurement posture and body movement into the appropriate range, and then the process proceeds to step S224. On the other hand, if the measurement posture and body movement are within the appropriate range, the process proceeds to step S220. The method of recognizing (determining) whether the measurement posture is within the appropriate range is as described above, and will not be described in detail here.

[0070] In step S220, a measurement (start) command instructing the start of measurement is transmitted to the annular biosensor 2. Then, in step S222, the photoelectric pulse wave data (blood pressure data) and acceleration data (body movement data) transmitted from the annular biosensor 2 are received (acquired). Here, blood pressure, blood glucose level, pulse rate, oxygen saturation, and respiration are acquired from the photoelectric pulse wave data. The amount of activity and the tilt of the annular biosensor 2 are acquired from the acceleration data. Furthermore, if a temperature sensor is provided, the body surface temperature is acquired from the temperature data. Thereafter, the process proceeds to step S224.

[0071] In step S224, a determination is made as to whether or not to disconnect the connection with the annular biosensor 2 via Bluetooth (registered trademark). If the connection is to be disconnected, the process temporarily exits after the connection with the annular biosensor 2 via Bluetooth (registered trademark) is disconnected. On the other hand, if the connection is not to be disconnected, the process proceeds to step S210, and the above-mentioned steps S210 to S224 are repeatedly executed.

[0072] As described above in detail, according to this embodiment, the annular biosensor 2 formed in a ring shape and provided with the sensor unit 22 is attached to a finger or wrist, so that the contact pressure (pressure) with the measurement site is stable, and biodata including blood pressure can be measured accurately. In addition, depending on the communication state (communication possible or not) of the short-distance wireless with the annular biosensor 2, it is determined whether the portable control unit 3 is held by the hand on which the annular biosensor 2 is attached (holding determination), and it is determined whether the user's measurement posture is appropriate or not (posture determination) from the position of the user's face in the image recognized from the image and the inclination of the portable control unit 3 with respect to the vertical direction. Therefore, the relative position of the portable control unit 3 and the face can be estimated from the position of the user's face in the image and the inclination of the portable control unit 3, and the height of the portable control unit 3 (the annular biosensor 2 attached to the hand holding the portable control unit 3) from the heart can be estimated.

[0073] Then, the annular biosensor 2 is controlled (biological data including blood pressure is measured) based on the judgment result (grasping judgment result) of whether the portable control unit 3 is being held by the hand wearing the annular biosensor 2, and the judgment result (posture judgment result) of whether the user's measurement posture is appropriate, so that the biodata including blood pressure can be measured more accurately. Furthermore, since no cuff is used, the biodata including blood pressure can be measured non-invasively with excellent portability. As a result, according to this embodiment, it is possible to measure biodata including blood pressure, which is influenced by the difference between the height of the measurement site and the height of the heart (i.e., influenced by hydrostatic pressure), more accurately and non-invasively with excellent portability.

[0074] In this case, according to the present embodiment, the user's face in the image is automatically recognized, and the position of the user's heart in the image is estimated based on the display position and display size of the face. In this way, the distance between the face and the heart can be estimated from the size of the face, so that it is possible to improve the accuracy of determining whether the annular biosensor 2 is at the height of the heart.

[0075] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible. For example, in the above embodiment, the measured data (measurement data) such as blood pressure is sequentially transmitted to the portable control unit 3. The configuration may be such that the data is stored in an EEPROM or RAM of the annular biosensor 2 and is read out later (after measurement).

[0076] In the above embodiment, a photoplethysmographic sensor is used as the annular biosensor 2 (sensor section 22), but the annular biosensor 2 (sensor section 22) is not limited to a photoplethysmographic sensor.

[0077] In the above embodiment, NFC is used for short-distance wireless communication to determine whether the portable control unit 3 is held by the hand to which the annular biosensor 2 is attached, but a short-distance wireless communication method other than NFC may be used. Also, Bluetooth (registered trademark) is used as a wireless communication standard for transmitting and receiving data (control data (commands) and measurement data, etc.) between the annular biosensor 2 and the portable control unit 3, but instead of Bluetooth (registered trademark), for example, BLE (Bluetooth (registered trademark) Low Energy) or the like may be used. [Explanation of symbols]

[0078] 1. Biometric data measurement system 2. Ring-shaped biosensor 21 Main body 22 Sensor unit (photoplethysmography sensor) 221 Light-emitting element (light-emitting part) 222 Light receiving element (light receiving part) 231 Sensor side near field communication unit (NFC module) 232 Sensor side communication unit (BT module) 24 Judgment section 25 Acceleration Sensor 3 Portable Control Unit 31 Imaging unit 32 Display section 331 Unit side near field communication unit (NFC module) 332 Unit side communication section (BT module) 34 Control section 35 Inclination sensor (acceleration sensor)

Claims

1. A biometric data measurement system including an annular biometric sensor and a portable control unit configured to be able to communicate with each other, The annular biosensor includes: A main body portion formed in a ring shape so as to be wearable on a finger or a wrist; a sensor unit provided in the main body unit and measuring biological data including blood pressure; a sensor-side short-range wireless communication unit that is capable of communicating with the portable control unit when the portable control unit is within a predetermined range; The portable control unit includes: An imaging unit that captures an image; a display unit that prompts a user holding the portable control unit with a hand having the annular biosensor attached thereto to capture an image of the user's face and displays the image captured by the image capture unit; an inclination sensor that detects an inclination of the portable control unit with respect to a vertical direction; a unit-side short-range wireless communication unit that is capable of communicating with the annular biosensor when the annular biosensor is within a predetermined range; a control unit that determines whether the portable control unit is held in the hand in which the annular biosensor is attached according to a state of wireless communication with the annular biosensor, and determines whether the user's measurement posture is appropriate from the position of the user's face in the image recognized from the image and the inclination of the portable control unit with respect to the vertical direction, and controls the biodata measurement system and acquires biodata including blood pressure based on the determination result of whether the portable control unit is held in the hand in which the annular biosensor is attached and the determination result of whether the user's measurement posture is appropriate; each of the sensor-side short-range wireless communication unit and the unit-side short-range wireless communication unit is implemented by a near field communication (NFC) module; A biometric data measurement system characterized in that the control unit of the portable control unit determines whether the portable control unit is held by the hand in which the annular biometric sensor is attached, depending on whether NFC communication is possible between the portable control unit and the annular biometric sensor.

2. A biometric data measurement system including an annular biometric sensor and a portable control unit configured to be able to communicate with each other, The annular biosensor includes: A main body portion formed in a ring shape so as to be wearable on a finger or a wrist; a sensor unit provided in the main body unit and measuring biological data including blood pressure; a sensor-side short-range wireless communication unit that is capable of communicating with the portable control unit when the portable control unit is within a predetermined range; The portable control unit includes: An imaging unit that captures an image; a display unit that prompts a user holding the portable control unit with a hand having the annular biosensor attached thereto to capture an image of the user's face and displays the image captured by the image capture unit; an inclination sensor that detects an inclination of the portable control unit with respect to a vertical direction; a unit-side short-range wireless communication unit that is capable of communicating with the annular biosensor when the annular biosensor is within a predetermined range; a control unit that determines whether the portable control unit is held in the hand in which the annular biosensor is attached according to a state of wireless communication with the annular biosensor, and determines whether the user's measurement posture is appropriate from the position of the user's face in the image recognized from the image and the inclination of the portable control unit with respect to the vertical direction, and controls the biodata measurement system and acquires biodata including blood pressure based on the determination result of whether the portable control unit is held in the hand in which the annular biosensor is attached and the determination result of whether the user's measurement posture is appropriate; The sensor side short-range wireless communication unit and the unit side short-range wireless communication unit each include A Bluetooth® module is included. A biometric data measurement system characterized in that the control unit of the portable control unit determines whether the portable control unit is being held by the hand in which the annular biometric sensor is attached, depending on whether the received signal strength of the radio waves transmitted from the annular biometric sensor is above a predetermined value.

3. The biometric data measurement system according to claim 1 or 2, characterized in that the sensor-side short-range wireless communication unit is arranged in the main body portion so as to be located on the pad side of the finger when the annular biometric sensor is worn on the user's finger.

4. The biometric data measurement system of any one of claims 1 to 3, characterized in that the control unit of the portable control unit acquires pre-stored physical information of the user, and determines whether the user's measurement posture is appropriate by taking into account the physical information.

5. The biometric data measurement system of any one of claims 1 to 4, characterized in that the control unit of the portable control unit determines that the user's measurement posture is inappropriate when the difference in height between the annular biometric sensor and the user's heart is outside a predetermined range, and when the inclination of the user's trunk relative to the vertical direction is outside a predetermined range.

6. The biometric data measurement system according to any one of claims 1 to 5, characterized in that the display unit of the portable control unit graphically displays the recommended range of face display position and face display size.

7. The controller of the portable control unit recognizes a face of the user in the image; 7. The biometric data measurement system according to claim 6, wherein the display unit of the portable control unit notifies whether the face display position and face display size are within a recommended range.

8. The biometric data measurement system according to claim 5, characterized in that the display unit of the portable control unit indicates whether the inclination of the portable control unit and the inclination of the user's trunk are each within a predetermined range.

9. The annular biosensor includes a determination unit that determines whether the annular biosensor is attached to a finger or a wrist; a sensor side communication unit that transmits and receives data to and from the portable control unit, The sensor side communication unit of the annular biosensor transmits a determination result of whether or not the annular biosensor is attached to a finger or a wrist to the portable control unit; The biometric data measurement system of claim 5, characterized in that the control unit of the portable control unit prohibits determination of the user's measurement posture when the annular biometric sensor is not worn on a finger or wrist.

10. The biological data measurement system according to any one of claims 1 to 9, characterized in that the biological data includes, in addition to blood pressure, at least one of blood glucose level, pulse rate, respiration, pulse wave, oxygen saturation, body surface temperature, and activity level.

11. The biometric data measurement system according to claim 5 , wherein the control unit of the portable control unit calculates the reliability of the acquired biometric data including blood pressure based on the result of the determination of the user's measurement posture.

12. 6. The biological data measurement system according to claim 5, wherein the control unit of the portable control unit corrects biological data including blood pressure based on a result of determining the measurement posture of the user.

13. the tilt sensor of the portable control unit detects a tilt of the portable control unit with respect to a vertical direction when the portable control unit is in close contact with the trunk of the user; the control unit of the portable control unit determines whether or not a tilt of the user's trunk is within a predetermined range based on the detected tilt of the portable control unit with respect to a vertical direction; 6. The biological data measuring system according to claim 5, wherein the display section of the portable control unit displays the result of the determination made by the control section.

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