WO2019131249A1

WO2019131249A1 - Biological information measurement device, measurement control method, and program

Info

Publication number: WO2019131249A1
Application number: PCT/JP2018/046244
Authority: WO
Inventors: 出野　徹; 直樹土屋; 臼井　弘; 皓介井上; 善之森田; 和松岡
Original assignee: オムロンヘルスケア株式会社
Priority date: 2017-12-27
Filing date: 2018-12-17
Publication date: 2019-07-04
Also published as: JP2019115602A

Abstract

The biological information measurement device pertaining to an embodiment of the present invention is provided with a movement detection unit for detecting movement of a part to be measured on the basis of a pressure signal indicating the pressure inside a fluid bag, and an instruction discriminating unit for discriminating the content of an instruction relating to measurement of biological information by a measurement subject on the basis of the result of detection of movement of the part to be measured.

Description

Biological information measuring device, measurement control method and program

The present invention relates to a biological information measuring device for measuring biological information such as blood pressure, and a measurement control method and program executed by this device.

In recent years, development of wearable-type biological information measuring devices has been promoted. For example, Japanese Patent Application Laid-Open No. 2017-6230 discloses a wristwatch-type biological information measuring device. The biological information measuring device receives a user input such as a measurement start instruction with a push-type switch.

The biological information measuring device disclosed in Japanese Patent Application Laid-Open No. 2017-6230 has a small switch and is not good in operability. Therefore, the user can not operate the biological information measurement device, for example, when it is not possible to freely move the fingers due to a failure, health reasons, or some other circumstances. In the wearable type biological information measuring apparatus, improvement in operability is desired.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a biological information measuring device, a measurement control method and a program for improving operability.

The present invention adopts the following aspects in order to solve the above-mentioned problems.

A biological information measuring apparatus according to an aspect of the present invention measures biological information by pressing a measurement target region of a subject with a cuff including a fluid bag, and indicates the pressure inside the fluid bag. An instruction for determining the content of an instruction related to the measurement of the biological information by the subject based on a motion detection unit that detects the motion of the target site based on a pressure signal, and a detection result of the motion of the target site And a determination unit.

According to the above configuration, the subject can input an instruction related to measurement of biological information to the biological information measurement device by moving the measurement site. As a result, for example, the switch operation with a finger becomes unnecessary, and the operability of the biological information measurement device is improved. In addition, since the movement of the measurement site is detected using the fluid bag already provided to measure the biological information, it is not necessary to additionally install a sensor for detecting the movement of the measurement site.

In the biological information measurement device according to the above aspect, the motion detection unit may detect the motion of the measurement site based on comparison between the value of the fluctuation component included in the pressure signal and a preset threshold value. . According to the said structure, the process which detects the motion of a to-be-measured site | part can be easily performed by threshold value determination.

In the biological information measurement device according to the above aspect, the motion detection unit may output a detection result including the number of times the value of the fluctuation component exceeds the threshold, and the instruction determination unit is included in the detection result. The content of the instruction from the subject may be determined based on the number of times the information is read. According to the configuration, it is possible to prevent erroneous determination as an instruction when the measurement site is moved unintentionally, and it becomes possible to input different instructions according to how to move the measurement site. .

In the biological information measurement device according to the above aspect, the movement detection unit may detect the movement of the measurement site based on the matching between the waveform of the fluctuation component included in the pressure signal and the reference waveform prepared in advance. Good. According to this configuration, it is possible to more accurately determine the movement of the measurement site as compared to the case where the pressure value is determined using the threshold value. For this reason, it becomes possible to input more instructions correctly by the movement of a to-be-measured site | part.

The biological information measurement apparatus according to the above aspect may further include a posture detection unit that detects the posture of the measurement target region, and the instruction determination unit determines the detection result of the movement of the measurement target region and the measurement target region. The instruction content relating to the measurement of the biological information by the subject may be determined based on a combination with the posture detection result. According to this configuration, when the measurement site is in a predetermined posture, it is possible to input an instruction based on the movement of the measurement site. As a result, erroneous input of instructions can be prevented.
As one example, the measurement start instruction of the biological information is determined based on the detection result of the posture of the measurement target region, and the biological information is determined based on the detection result of the movement of the measurement target after the determination of the measurement start instruction. A configuration may be considered to determine the measurement stop instruction of.

According to the present invention, it is possible to provide a biological information measurement device, a measurement control method, and a program for improving operability.

FIG. 1 is a block diagram showing a biological information measurement apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing the appearance of the blood pressure measurement device according to the first embodiment. FIG. 3 is a cross-sectional view showing the cuff structure shown in FIG. FIG. 4 is a block diagram showing an example of a hardware configuration of the blood pressure measurement device of FIG. FIG. 5 is a functional block diagram showing a control unit provided in the blood pressure measurement device of FIG. FIG. 6 is a flowchart illustrating the blood pressure measurement method according to the first embodiment. FIG. 7 is a graph showing an example of the pressure Cc of the sensing cuff detected by the pressure sensor shown in FIG. 4 and the noise component Dn contained therein. FIG. 8 is a functional block diagram showing a control unit provided in the blood pressure measurement device according to the modification. FIG. 9A is a view showing an example of a suitable blood pressure measurement posture. FIG. 9B is a diagram showing an example of gesture input.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[One embodiment]
FIG. 1 is a block diagram showing a functional configuration of a biological information measurement device 1 according to an embodiment of the present invention.
The living body information measuring device 1 is a wearable living body information measuring device provided with a cuff 2, and is mounted on a measurement target site (for example, a wrist) of a user who is a measurement subject. The biological information measurement device 1 includes a biological information measurement unit 10, a fluid supply unit 20, a motion detection unit 30, and an instruction determination unit 40.

The biological information measurement unit 10 controls the fluid supply unit 20 to measure biological information. The fluid supply unit 20 supplies a fluid to the cuff 2 under the control of the biological information measurement unit 10 to expand the cuff 2 and press the measurement site. The biological information measurement unit 10 detects the pressure of the cuff 2 with a pressure sensor (not shown) and calculates biological information based on the output of the pressure sensor while pressing the measurement target region. Biological information includes, but is not limited to, blood pressure values and pulse rates. As the fluid, air is typically used, but other gas or liquid may be used.

When the user moves the measurement site on which the biological information measurement device 1 is mounted, noise (referred to as cuff noise) that fluctuates according to the movement of the measurement site is generated in the output signal of the pressure sensor. Therefore, it is possible to detect the movement of the measurement site based on the fluctuation component included in the output signal of the pressure sensor. The motion detection unit 30 detects the motion of the measurement site based on the fluctuation component included in the output signal of the pressure sensor.

The instruction determination unit 40 determines an instruction related to measurement of biological information by the user based on the detection result of the movement of the measurement site by the movement detection unit 30. For example, in the case where the biological information measuring device 1 is a wrist type, when the motion detecting unit 30 detects a gesture of shaking the arm including the wrist twice, the instruction determining unit 40 receives an instruction to stop the measurement from the user. recognize. As described above, the biological information measurement device 1 determines the movement (gesture) of the predetermined measurement site as a command related to the measurement of the biological information by the user. When determining the instruction related to the measurement of the biological information, the instruction determination unit 40 gives the biological information measurement unit 10 information indicating the instruction. The living body information measurement unit 10 performs an operation related to measurement of living body information based on the instruction information received from the instruction determination unit 40.

According to the biological information measuring device 1 having the above-described configuration, the user can input an instruction related to the measurement of biological information by performing a simple operation such as moving the measurement site. Therefore, the operability can be improved as compared with the case of operating the switch with fingers. This effect is particularly effective when the hand can not be moved freely due to disability, health reasons, or something else. In addition, since the movement of the measurement site is detected using components already provided to measure biological information, there is no need to additionally install a sensor for detecting the movement of the measurement site, It is possible to prevent the increase in size and cost of the device.

In addition, as a to-be-measured site | part, not only a wrist but other site | parts, such as an upper arm, may be sufficient.

Example 1
(Constitution)
FIG. 2 is a perspective view showing an appearance of a blood pressure measurement device 200 which is one embodiment of the biological information measurement device according to the present invention. The blood pressure measurement device 200 is a watch-type wearable device. The blood pressure measurement device 200 is designed to be worn on the user's left wrist and measures blood pressure at the left wrist. The blood pressure measurement device 200 includes a main body 210, a belt 230, and a cuff structure 250. The belt 230 and the cuff structure 250 may be collectively referred to as a cuff.

The main body 210 includes a cylindrical case 211, a circular glass 212 attached to one opening of the case 211, and a back cover 213 attached to the other opening of the case 211. The case 211 has a pair of projecting lugs for attaching the belt 230 at each of two places on its side.

A display unit 215 is provided inside the main body 210 so as to face the glass 212. As the display unit 215, for example, an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diode) display, or the like can be used. The main body 210 is provided with an operation unit 216. The operation unit 216 enables the user to input various instructions to the blood pressure measurement device 200. The user can use the operation unit 216 to input a blood pressure measurement execution instruction or to input a blood pressure measurement result history display instruction. In this example, the operation unit 216 includes push-

type switches

216A, 216B, and 216C provided on the side surface of the case 211. A touch screen may be used as a combination of the display unit 215 and the operation unit 216.

Inside the main body 210, a plurality of elements including an element for blood pressure measurement are further provided. These elements will be described later with reference to FIG.

The belt 230 is an example of a mounting member for mounting the main body 210 and the cuff structure 250 on the user's left wrist. The belt 230 includes a belt-shaped first belt portion 231 and a belt-shaped second belt portion 236. The root portion 232 of the first belt portion 231 is rotatably attached to a pair of lugs of the main body 210 by a connecting rod 221 extending in the X direction. The X direction corresponds to the width direction of the belt 230. Similarly, the root portion 237 of the second belt portion 236 is rotatably attached to a pair of lugs of the main body 210 by a connecting rod 226 extending in the X direction.

A tail lock 240 is attached to the tip end portion 233 of the first belt portion 231. The tail lock 240 includes a substantially U-shaped frame body 241, a stick bar 242, and a connecting bar 243 extending in the X direction. The frame body 241 and the sticking rod 242 are rotatably attached to the tip end portion 233 of the first belt portion 231 by the connecting rod 243. Ring-shaped

belt holding portions

234 and 235 are provided between the distal end portion 233 and the root portion 232 of the first belt portion 231. The inner circumferential surface of the first belt portion 231 does not protrude inward at the portions of the

belt holding portions

234 and 235. Thereby, the belt 230 can uniformly surround the outer peripheral surface of the cuff structure 250.

A plurality of small holes 239 are formed in the thickness direction of the second belt portion 236 between the root portion 237 and the tip end portion 238 of the second belt portion 236. When the first belt portion 231 and the second belt portion 236 are fastened, the second belt portion 236 is passed through the frame body 241 of the tail lock 240 from the tip end 238 side, and a plurality of small holes in the second belt portion 236 A stick 242 of the tail lock 240 is inserted into any one of 239. Then, the tip end portion 238 of the second belt portion 236 is held by the

belt holding portions

234 and 235.

The first belt portion 231 and the second belt portion 236 are formed of, for example, a plastic material. The first belt portion 231 and the second belt portion 236 are flexible in the thickness direction and substantially non-stretchable in the longitudinal direction. Thus, the blood pressure measurement device 200 can be easily attached, and compression of the left wrist can be assisted at the time of blood pressure measurement. The first belt portion 231 and the second belt portion 236 may be formed of another material, for example, a leather material. The frame body 241 and the stick 242 of the buckle 240 are formed of, for example, a metal material. The frame body 241 and the stick 242 may be formed of other materials, for example, a plastic material.

The cuff structure 250 has an elongated band shape. The cuff structure 250 is opposed to the inner circumferential surface of the belt 230. The root portion 251 of the cuff structure 250 is attached to the main body 210. The tip 252 of the cuff structure 250 is a free end. Thus, the cuff structure 250 can be separated from the inner circumferential surface of the belt 230.

The cuff structure 250 includes a curler 254, a pressure cuff 255 disposed along the inner circumferential surface of the curler 254, a back plate 256 disposed along the inner circumferential surface of the pressure cuff 255, and an inner circumferential surface of the back plate 256. And a sensing cuff 257 disposed along the In a state where the blood pressure measurement device 200 is worn by the user, the sensing cuff 257 contacts the left wrist. In the present specification, “contact” includes not only direct contact but also indirect contact via another member (for example, a cover member). In the present embodiment, the belt 230, the curler 254, the pressing cuff 255, and the back plate 256 function as pressing parts capable of generating a force for pressing the sensing cuff 257 against the left wrist. The blood pressure measurement device 200 compresses the left wrist via the sensing cuff 257 by the pressing unit.

The curler 254 is, for example, a resin plate (for example, a polypropylene plate) having a certain degree of flexibility and hardness. In the natural state, the curler 254 has a curved shape along the Y direction. As a result, the shape of the cuff structure 250 in the natural state is kept curved along the Y direction. The Y direction corresponds to the circumferential direction of the left wrist.

The pressure cuff 255 is a fluid bag capable of containing fluid. Attached to the pressure cuff 255 is a flexible tube 421 (shown in FIG. 4). The flexible tube 421 is used to supply pressure fluid to the pressure cuff 255 and to discharge pressure fluid from the pressure cuff 255. As fluid is supplied to the pressure cuff 255, the pressure cuff 255 expands, thereby compressing the left wrist.

As one example, the pressure cuff 255 includes two bag-like members stacked in the thickness direction. Each bag-like member is formed, for example, by welding the peripheral portions of two stretchable polyurethane sheets. In these bag-like members, a plurality of through holes are formed in order to allow the fluid to flow between the bag-like members. A flexible tube 421 is attached to one of the bag-like members. When the fluid is supplied to the bag-like members via the flexible tube 421, the pressure cuffs 255 press the sensing cuffs 257 against the left wrist by the expansion of the bag-like members and press the left wrist.

The back plate 256 is, for example, a resin plate (for example, a polypropylene plate). The back plate 256 functions as a reinforcing plate. The back plate 256 can transmit the pressing force from the pressing cuff 255 to the entire area of the sensing cuff 257. A plurality of V-shaped or U-shaped grooves extending in the X direction are provided on the inner and outer peripheral surfaces of the back plate 256. Thereby, the back plate 256 is easily bent. Thus, the back plate 256 does not prevent the cuff structure 250 from bending.

The sensing cuff 257 is a fluid bag capable of containing a fluid. As an example, the sensing cuff 257 includes two stretchable polyurethane sheets, and the peripheral portions of these polyurethane sheets are welded to form a bag shape. Attached to the sensing cuff 257 is a flexible tube 423 (shown in FIG. 4). The flexible tube 423 is used to supply fluid for pressure transmission to the sensing cuff 257 and to discharge fluid for pressure transmission from the sensing cuff 257.

The blood pressure measurement device 200 having the above-described structure is mounted on the left wrist of the user with the cuff structure 250 surrounding the left wrist and the belt 230 restraining the cuff structure 250 against the left wrist.

FIG. 3 shows a cross section of the blood pressure measurement device 200 in a state where the blood pressure measurement device 200 is mounted on the left wrist 300 (hereinafter referred to as a mounted state). This cross section corresponds to the cross section perpendicular to the X direction shown in FIG. In FIG. 3, the main body 210 and the belt 230 are not shown. In FIG. 3, a radial artery 301, an ulnar artery 302, a rib 303, an ulna 304, and a tendon 305 of the left wrist 300 are shown.

In the worn state, the curler 254 extends along the Y direction (corresponding to the circumferential direction of the left wrist 300). The pressing cuff 255 extends in the Y direction on the inner circumferential side of the curler 254. The back plate 256 extends along the Y direction on the inner peripheral side of the pressing cuff 255. The sensing cuff 257 is disposed on the inner peripheral side of the back plate 256, contacts the left wrist 300, and extends along the Y direction so as to cross the arterial passage portion 300A of the left wrist 300.

The blood pressure measurement device 200 adopts a double cuff structure having two fluid bags (ie, a pressing cuff 255 and a sensing cuff 257), and the left wrist is compressed by the sensing cuff 257 by the pressing force from the pressing cuff 255. This enables effective compression of the artery (eg, radial artery 301) passing through the left wrist 300. As a result, accurate blood pressure measurement can be performed.

FIG. 4 shows a hardware configuration example of the blood pressure measurement device 200. The blood pressure measurement device 200 includes a CPU (Central Processing Unit) 401, a memory 402, a communication unit 407, a battery 408, a pressure sensor 409, a pressure sensor 410, a pump drive circuit 411, in addition to the display unit 215 and the operation unit 216 described above. A pump 412, an on-off valve drive circuit 415, and an on-off valve 416 are provided inside the main body 210 of the blood pressure measurement device 200.

The CPU 401 is an example of a processor that configures a computer. The CPU 401 controls each component according to the control program stored in the memory 402. For example, the CPU 401 performs control of driving the pump 412 and the on-off valve 416 based on the signals from the

pressure sensors

409 and 410. The CPU 401 also performs control to calculate the blood pressure value and the pulse rate based on the signal from the pressure sensor 410.

The memory 402 includes, for example, a random access memory (RAM) and an auxiliary storage device. The auxiliary storage device stores various data including data used to control each component of the blood pressure measurement device 200 and blood pressure data obtained by blood pressure measurement, in addition to the control program described above. The auxiliary storage device may be a semiconductor memory such as a flash memory. The RAM is used as a work memory or the like when the program is executed. The memory 402 may further include a ROM (Read Only Memory). In this case, part or all of the control program may be stored in the ROM.

The communication unit 407 is an interface for communicating with the external device 450. The external device 450 is, for example, a portable terminal such as a smartphone or a tablet terminal, or a server. The communication unit 407 exchanges information with the external device 450 via the network. The communication unit 407 transmits the information received from the CPU 401 to the external device 450. The communication unit 407 also receives information from the external device 450 and passes the received information to the CPU 401. Communication via the network may be implemented by wireless communication, wired communication, or both. The network is, for example, the Internet, but is not limited thereto. The network may be another type of network such as a hospital local area network (LAN), or may be one-to-one communication using a USB cable or the like. The communication unit 407 may include a micro USB connector. The communication unit 407 may directly communicate with the external device 450 by near field communication such as Bluetooth (registered trademark).

The battery 408 is, for example, a rechargeable secondary battery. The battery 408 supplies power to each element mounted on the main body 210. The battery 408 supplies power to, for example, the display unit 215, the CPU 401, the memory 402, the communication unit 407, the pressure sensor 409, the pressure sensor 410, the pump drive circuit 411, the pump 412, the on-off valve drive circuit 415, and the on-off valve 416. .

The pressure sensor 409 is, for example, a piezoresistive pressure sensor. The pressure sensor 409 detects the pressure inside the pressure cuff 255 via the flexible tube 421 and the flow path forming member 422. The flexible tube 421 and the flow path forming member 422 form a flow path connecting the pump 412 and the pressure cuff 255 so as to allow the fluid from the pump 412 to be injected into the pressure cuff 255. The pressure sensor 409 outputs a pressure signal to the CPU 401. Although not shown in FIG. 4, an amplifier that amplifies the output signal of pressure sensor 409 and an analog-to-digital converter that converts the output signal of the amplifier from an analog signal to a digital signal are provided between pressure sensor 409 and CPU 401. Be

The pressure sensor 410 is, for example, a piezoresistive pressure sensor. The pressure sensor 410 detects the pressure inside the sensing cuff 257 via the flow path forming member 422, the flexible tube 423 and the flow path forming member 424. The flow path forming member 422, the flexible tube 423 and the flow path forming member 424 connect the pump 412 and the sensing cuff 257 so as to allow the fluid from the pump 412 to be injected into the sensing cuff 257. Form The pressure sensor 410 outputs a pressure signal to the CPU 401. Although not shown in FIG. 4, an amplifier that amplifies the output signal of pressure sensor 410 and an analog-to-digital converter that converts the output signal of the amplifier from an analog signal to a digital signal are provided between pressure sensor 410 and CPU 401. Be

The pump drive circuit 411 drives the pump 412 based on a control signal from the CPU 401. The pump 412 is, for example, a piezoelectric pump. The pump 412 can supply fluid to the pressure cuff 255 through the flexible tube 421 and the flow path forming member 422. Further, the pump 412 can supply fluid to the sensing cuff 257 through the flow path forming member 422, the flexible tube 423 and the flow path forming member 424. The pump 412 is equipped with an exhaust valve whose opening and closing are controlled in accordance with the on / off of the pump 412. That is, the exhaust valve closes when the pump 412 is turned on to help entrap air within the pressure cuff 255. On the other hand, the exhaust valve opens when the pump 412 is turned off to discharge the air in the pressure cuff 255 to the atmosphere. The exhaust valve has the function of a check valve, and the discharged air does not flow back.

The on-off valve drive circuit 415 drives the on-off valve 416 based on a control signal from the CPU 401. The on-off valve 416 is interposed between the flow path forming member 422 and the flow path forming member 424. The on-off valve 416 is, for example, a normally open solenoid valve. Opening and closing (opening degree) of the on-off valve 416 is controlled based on a control signal from the CPU 401. When the on-off valve 416 is in the open state, the pump 412 can supply fluid to the sensing cuff 257 through the flow path forming member 422, the flexible tube 423 and the flow path forming member 424.

The pump drive circuit 411, the pump 412, the on-off valve drive circuit 415, and the on-off valve 416 supply fluid to the pressing cuff 255 and the sensing cuff 257, and an example of a fluid supply unit that discharges fluid from the pressing cuff 255 and the sensing cuff 257 It is.

FIG. 5 is a block diagram showing a software configuration of the control unit 500 provided in the blood pressure measurement device 200. The same reference numerals as in FIG. 4 denote the same parts in FIG. 5, and a detailed description thereof will be omitted.

The control unit 500 is realized by one or more processors (for example, the CPU 401) executing a control program stored in the memory 402. Note that part or all of the control unit 500 may be realized by a hardware circuit such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

The control unit 500 includes a motion detection unit 501, an instruction determination unit 502, a blood pressure measurement unit 503, and a blood pressure measurement result output unit 506.

The motion detection unit 501 detects the motion of the left wrist based on the pressure signal received from the pressure sensor 410. The motion detection unit 501 may detect the motion of the left wrist based on the pressure signal received from the pressure sensor 409. Also, the motion detection unit 501 may detect the motion of the left wrist based on the pressure signals received from both the pressure sensor 409 and the pressure sensor 410.

As a method of detecting the movement of the left wrist, for example, a method of comparing a pressure signal with a threshold can be used. For example, the motion detection unit 501 extracts the fluctuation component from the pressure signal, and the user moves the left arm (including the left wrist) when the value (for example, the amplitude value or the fluctuation amount) of the extracted fluctuation component exceeds a preset threshold. ) Can recognize that the gesture was made. Also, the motion detection unit 501 can recognize the number of times the user has made a gesture of swinging the left arm based on the number of times the value of the fluctuation component exceeds the threshold (for example, 2 seconds) within a preset time. The motion detection unit 501 can also recognize a gesture for raising the wrist to the height of the heart by using a threshold different from the threshold related to the gesture for shaking the arm. These threshold values may be fixed values, and may be set based on the gesture actually performed by the user in the gesture setting mode.

Pattern matching may be used as a method of detecting the movement of the left wrist. For example, a cuff noise waveform corresponding to various gestures such as a cuff noise waveform generated when the arm is shaken and a cuff noise generated when the wrist is raised to the height of the heart are collected in advance as a reference waveform and stored in the memory 402 deep. The motion detection unit 501 detects the motion of the left wrist based on the matching between the waveform of the fluctuation component included in the pressure signal and the reference waveform stored in the memory 402. For example, when a waveform whose degree of similarity with the reference waveform exceeds a threshold appears in the fluctuation component of the pressure signal, the motion detection unit 501 can recognize a gesture corresponding to the reference waveform. The reference waveform may be prepared based on an unspecified number of samples, or may be determined based on a gesture actually performed by the user in the gesture setting mode.

The instruction determination unit 502 determines an instruction related to measurement by the user. The instruction determination unit 502 can determine an instruction from the user based on the result of detection by the motion detection unit 501. A plurality of contents of the instruction may be prepared. The content of the instruction is determined in advance in accordance with how to move the left wrist, which is the measurement site to which the blood pressure measurement device 200 is attached. For example, the gesture for raising the wrist to the height of the heart is associated with an instruction to start blood pressure measurement, and the gesture for swinging the left arm twice is associated with an instruction to stop blood pressure measurement.

In addition, the instruction determination unit 502 can determine an instruction according to the operation of the operation unit 216 by the user. For example, when performing blood pressure measurement, the user presses the switch 216B (FIG. 2) to switch the blood pressure measurement device 200 to the blood pressure measurement mode, and then presses the switch 216A to start blood pressure measurement.

When the instruction determination unit 502 determines an instruction related to blood pressure measurement, the instruction determination unit 502 provides the blood pressure measurement unit 503 with information indicating the content of the determined instruction.

The blood pressure measurement unit 503 measures the blood pressure of the user. The blood pressure measurement unit 503 can operate based on the information received from the instruction determination unit 502. For example, upon receiving information indicating an instruction to start blood pressure measurement from the instruction determination unit 502, the blood pressure measurement unit 503 starts blood pressure measurement.

The blood pressure measurement unit 503 includes a fluid supply control unit 504 and a blood pressure value calculation unit 505. The fluid supply control unit 504 controls the supply of fluid to the pressure cuff 255 and the sensing cuff 257. Specifically, the fluid supply control unit 504 controls the fluid supply unit 511 that supplies fluid to the pressure cuff 255 and the sensing cuff 257. The fluid supply unit 511 includes a pump drive circuit 411, a pump 412, an on-off valve drive circuit 415, and an on-off valve 416. The fluid supply control unit 504 provides control signals to the pump drive circuit 411 and the on-off valve drive circuit 415, respectively.

The blood pressure value calculation unit 505 calculates a blood pressure value based on the pressure signal obtained by the pressure sensor 410. Blood pressure values include, but are not limited to, for example, systolic blood pressure (SBP; Systolic Blood Pressure) and diastolic blood pressure (DBP; diastolic blood pressure). The calculated blood pressure value is stored in the memory 402 in association with additional information such as time.

The blood pressure measurement result output unit 506 outputs the blood pressure measurement result. For example, the blood pressure measurement result output unit 506 displays the blood pressure value calculated by the blood pressure value calculation unit 505 on the display unit 215.

(Operation)
Next, the operation of the blood pressure measurement device 200 will be described.
FIG. 6 is a flowchart illustrating the blood pressure measurement control method according to the first embodiment.
In step S601 in FIG. 6, the instruction determination unit 502 acquires an instruction to start blood pressure measurement from the user. For example, the motion detection unit 501 detects that the user raises the left wrist to the height of the heart, and the instruction determination unit 502 thereby determines that the user has input a blood pressure measurement start instruction. As a method of detecting that the left wrist has been raised to the height of the heart, as described above, a method of comparing the value of the pressure signal detected by the pressure sensor 409 or the pressure sensor 410 with a threshold, a pressure signal A method of performing pattern matching between the waveform of and the reference waveform is used. The instruction determination unit 502 provides the blood pressure measurement unit 503 with information indicating the determined instruction content, that is, information indicating that the user has input a blood pressure measurement start instruction. When the information indicating the content of the instruction is received, the blood pressure measurement unit 503 starts blood pressure measurement in step S602.

When the blood pressure measurement is started, in step S603, the control unit 500 waits for the movement of the left wrist indicating the blood pressure measurement stop instruction, that is, the measurement stop gesture, under the control of the motion detection unit 501 and the instruction determination unit 502. For example, the measurement stop gesture is an operation of shaking the left arm twice. Specifically, the motion detection unit 501 extracts the fluctuation component included in the pressure signal from the pressure sensor 410, and the value of the extracted fluctuation component exceeds the threshold set in advance for 2 seconds twice. Determine if FIG. 7 illustrates the pressure Pc inside the sensing cuff 257 obtained when the user shakes the left arm twice during blood pressure measurement. FIG. 7 also shows the fluctuation component Dn included in the pressure Pc. The fluctuation component Dn can be easily extracted from the pressure Pc since the pressure Pc of the sensing cuff 257 increases substantially linearly in the pressurization process if there is no pulse wave effect and noise such as cuff noise. In the example shown in FIG. 7, the fluctuation component Dn exceeds the threshold T by 2 degrees in 2 seconds.

When the motion detection unit 501 detects the above-described action of shaking the left arm twice before the blood pressure measurement is completed, the instruction determination unit 502 determines that the measurement stop gesture has been performed based on the detection result, and the blood pressure measurement unit An instruction to stop measurement is given to 503. When receiving the measurement stop instruction, the blood pressure measurement unit 503 stops the blood pressure measurement operation in step S604. The blood pressure measurement unit 503 may resume the blood pressure measurement operation after a predetermined time has elapsed since the blood pressure measurement operation was stopped. Also, a period for waiting for the measurement stop gesture may be determined. For example, the control unit 500 waits for a measurement stop gesture until a preset time (for example, 5 seconds) elapses from the time of starting measurement.

If the measurement stop gesture is not detected, the blood pressure measurement is continued, and the blood pressure measurement unit 503 calculates the blood pressure value based on the pressure signal from the pressure sensor 410 in step S605. The calculated blood pressure value can be displayed on the display unit 215.

The specific flow from the start of blood pressure measurement to the calculation of the blood pressure value will be described. Here, the fluid is air.
When the user performs an operation of raising the left wrist to the height of the heart described above or performs an instruction to start blood pressure measurement by performing a measurement start operation at the operation unit 216, the blood pressure measurement unit 503 receives the memory 402. Initialize the processing memory area of. Furthermore, the blood pressure measurement unit 503 turns off the pump 412 via the pump drive circuit 411 and opens the exhaust valve while keeping the on-off valve 416 open. Thus, the air in the pressure cuff 255 and the sensing cuff 257 is exhausted. The current output values of the pressure sensor 409 and the pressure sensor 410 are set as the respective reference values (0 mmHg adjustment).

The blood pressure measurement unit 503 turns on the pump 412 via the pump drive circuit 411. Thereby, supply of air to the pressure cuff 255 and the sensing cuff 257 is started. The pressure on pressure cuff 255 and sensing cuff 257 is monitored using pressure sensor 409 and pressure sensor 410.

When an appropriate amount of air is stored in the sensing cuff 257, the blood pressure measurement unit 503 closes the on-off valve 416 via the on-off valve drive circuit 415. For example, when the pressure of the sensing cuff 257 reaches a predetermined pressure (for example, 15 mmHg), or the driving time of the pump 412 for a predetermined time (for example, 3 seconds), the blood pressure measurement unit 503 The on-off valve 416 is closed via the drive circuit 415. As a result, the supply of air to the sensing cuff 257 is cut off.

Supply of air to the pressure cuff 255 is continued. Thus, the pressure cuff 255 is inflated and gradually pressurized. At this time, the back plate 256 transmits the pressing force from the pressing cuff 255 to the sensing cuff 257. Thereby, the sensing cuff 257 compresses the left wrist. In this pressurization process, the blood pressure measurement unit 503 monitors the pressure of the sensing cuff 257 using the pressure sensor 410 in order to calculate the blood pressure value, and the fluctuation component of the arterial volume generated in the radial artery of the wrist is pulse wave Acquire as a signal.

The blood pressure measurement unit 503 tries to calculate a blood pressure value by applying a known algorithm by oscillometric method based on the pulse wave signal acquired at this time. If at this time the blood pressure value can not be calculated because of insufficient data, the pressure cuff should be pressed unless the pressure in the sensing cuff 257 reaches the upper limit pressure (for safety, for example, 300 mmHg). The supply of air to 255 is continued.

Thus, when the blood pressure value can be calculated, the blood pressure measurement unit 503 turns off the pump 412 via the pump drive circuit 411 and opens the on-off valve 416 via the on-off valve drive circuit 415. Thus, the air in the pressure cuff 255 and the sensing cuff 257 is exhausted.

The blood pressure calculation may be performed not in the pressurization process of the pressure cuff 255 but in the decompression process.

The blood pressure measurement unit 503 turns off the pump 412 via the pump drive circuit 411 and receives the on-off valve 416 via the on-off valve drive circuit 415 when receiving a measurement stop instruction from the instruction determination unit 502 during execution of blood pressure measurement. open. Thus, the air in the pressure cuff 255 and the sensing cuff 257 is exhausted.

(effect)
As described above, the blood pressure measurement device 200 according to the first embodiment detects the movement of the left wrist based on the pressure signal indicating the pressure inside the sensing cuff 257 (or the pressing cuff 255), and detects the movement of the left wrist. Based on the result, an instruction on blood pressure measurement by the user is determined. Thus, the user can input an instruction for the blood pressure measurement device 200 by moving the left wrist on which the blood pressure measurement device 200 is mounted. As a result, for example, the switch operation with a finger becomes unnecessary, and the operability of the blood pressure measurement device 200 is improved. Also, since the motion of the left wrist is detected using the pressure sensor 410 (or pressure sensor 409) already provided to measure the blood pressure, a sensor for detecting the motion of the left wrist is additionally installed. There is no need. Furthermore, the user can start or stop blood pressure measurement at a desired timing.

The blood pressure measurement device 200 can, for example, extract the fluctuation component included in the pressure signal, and detect the movement of the left wrist based on the comparison between the value of the fluctuation component extracted and the preset threshold value. As described above, the process of detecting the movement of the left wrist may be performed by determination using a threshold. When the detection result of the movement of the left wrist includes the number of times the value of the extracted fluctuation component exceeds the threshold, the content of the instruction may be determined based on the number of times. In this case, the user can input different instructions depending on how to move the left wrist. The process of detecting the movement of the measurement site may be performed by pattern matching. When pattern matching is used, it is possible to more accurately determine the movement of the left wrist as compared to determination using a threshold. For this reason, it becomes possible to input more instructions correctly by the movement of the left wrist.

[Modification]
In the first embodiment, an instruction not intended by the user may be input. For example, when the user casually raises the left arm, the blood pressure measurement device 200 may determine that an instruction to start blood pressure measurement has been input and start blood pressure measurement. In the modification, a method for preventing such an erroneous input will be described.

The blood pressure measurement device 200 according to the modification has the same configuration as the blood pressure measurement device 200 according to the first embodiment described above. Here, parts different from the blood pressure measurement device 200 according to the first embodiment will be described, and description of the same parts as the blood pressure measurement device 200 according to the first embodiment will be omitted.

FIG. 8 is a block diagram showing the software configuration of the control unit 800 provided in the blood pressure measurement device 200 according to the modification. In FIG. 8, the same parts as those shown in FIG. 5 are denoted by the same reference numerals. The control unit 800 includes a motion detection unit 501, an instruction determination unit 802, a blood pressure measurement unit 503, a blood pressure measurement result output unit 506, and a posture detection unit 807. The blood pressure measurement device 200 according to the modification further includes an acceleration sensor 811 as hardware. The acceleration sensor 811 is, for example, a three-axis acceleration sensor, and outputs an acceleration signal representing acceleration in three directions orthogonal to one another.

The posture detection unit 807 detects the posture of the left wrist that is the measurement site. The posture of the user's left wrist corresponds to the posture of the main body 210 of the blood pressure measurement device 200. The posture detection unit 807 can detect the posture of the user's left wrist based on the acceleration signal from the acceleration sensor 811. The posture detection unit 807 may detect the posture of the user's left wrist based on a pressure signal from at least one of the pressure sensor 409 and the pressure sensor 410.

The instruction determination unit 802 acquires an instruction from the user based on a combination of the detection result of the movement of the left wrist and the detection result of the posture of the left wrist. Generally, in order to measure blood pressure accurately, it is desirable to perform blood pressure measurement in a posture in which the position of the measurement site (the left wrist in this example) is matched to the height of the heart. FIG. 9A shows an example of a posture suitable for measurement. For example, as illustrated in FIG. 9B, the instruction determination unit 802 indicates that the detection result of the left wrist posture is in a state in which the user has taken a posture suitable for measurement, and the detection result of the left wrist movement If it indicates that the user shook the left wrist, it can be determined that the user has input a blood pressure measurement start instruction.

The blood pressure measurement device 200 according to the modification having the configuration described above makes a gesture from the user when the posture of the left wrist is a preset posture, as when the user takes a posture suitable for blood pressure measurement. Accept input. As a result, it is possible to prevent an instruction that the user does not intend to be input.

The instruction discrimination unit 802 discriminates the measurement start instruction of blood pressure based on the detection result of the posture of the left wrist by the posture detection unit 807, and based on the detection result of the movement of the left wrist obtained after the discrimination of the measurement start instruction. An instruction to stop measuring blood pressure may be determined.

The blood pressure measurement device 200 according to the modification not only measures the blood pressure value and the pulse rate, but also has various functions as described below.

The blood pressure measurement device 200 according to the modification includes the acceleration sensor 811 as described above. The control unit 800 may calculate the amount of activity of the user based on the acceleration signal from the acceleration sensor 811. The activity amount is an index related to physical activity of the user such as walking, housework, desk work and the like. Examples of the activity amount include the number of steps, the number of steps walking fast, the number of steps walking up stairs, the walking distance, the calorie consumption, the amount of fat burning, and the like. The control unit 800 can also estimate the sleep state of the user by detecting the turn state of the user based on the acceleration signal.

The blood pressure measurement device 200 according to the modification may further include a temperature and humidity sensor, an air pressure sensor, and a GPS receiver.
The temperature and humidity sensor measures environmental temperature and humidity around the blood pressure measurement device, and outputs environmental data representing the environmental temperature and humidity. The control unit 800 links environment data with time information and stores the data in the memory. For example, air temperature (temperature change) is considered as one of the factors that can cause human blood pressure fluctuation. For this reason, environmental data is information that can be a factor of the blood pressure fluctuation of the user.

The atmospheric pressure sensor detects atmospheric pressure and outputs atmospheric pressure data. Barometric pressure data can be used to calculate the amount of activity. By using the barometric pressure data together with the acceleration signal, it becomes possible to calculate the number of steps of stairs and the like more accurately.

The GPS receiver receives GPS signals transmitted from a plurality of GPS satellites and outputs the received GPS signals. The control unit 800 calculates position information of the blood pressure measurement device, that is, the position of the user wearing the blood pressure measurement device based on the GPS signal. When the blood pressure measurement device does not include the GPS receiver, the position information of the blood pressure measurement device calculated by the external device can be acquired from the external device through the communication unit.

[Other embodiments]
The present invention is not limited to the above embodiment. For example, fluid may be enclosed in the sensing cuff 257 at the manufacturing stage of the cuff structure 250. In this case, control for supplying fluid to the sensing cuff 257 becomes unnecessary each time blood pressure measurement. As a result, CPU load can be reduced. Also, the fluid supplied to the pressure cuff 255 and the sensing cuff 257 may be different. A structure may be employed in which the pressing cuff 255 faces the sensing cuff 257 via the measurement site in the mounted state.

Furthermore, the blood pressure measurement device may adopt a single cuff structure having one air bladder. If a single cuff construction is employed, this will facilitate construction and control. As a result, the manufacturing cost can be reduced, and further, the CPU load can be reduced. Further, the blood pressure measurement device may adopt a structure having three or more air bags.

The present invention is not limited to the above-described embodiment as it is, and at the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, the components in different embodiments may be combined as appropriate.

Some or all of the above embodiments may be described as in the following appendices, but are not limited thereto.
(Supplementary Note 1)
A biological information measuring apparatus that measures biological information by pressing a measurement target site of a measurement subject with a cuff including an air bag,
At least one processor,
A memory connected to the at least one processor;
Equipped with
The at least one processor is
Detecting a movement of the measurement site based on a pressure signal indicating a pressure inside the fluid bag;
A biological information measuring device configured to determine the content of an instruction related to the measurement of the biological information by the person to be measured based on the detection result of the movement of the portion to be measured.

(Supplementary Note 2)
A measurement control method executed by a biological information measurement apparatus that measures biological information by pressing a measurement target region of a measurement subject with a cuff including a fluid bag,
Detecting the movement of the measurement site based on a pressure signal indicative of the pressure inside the fluid bladder using at least one processor;
Determining an instruction related to the measurement of the biological information by the subject based on the detection result of the movement of the target site using at least one processor.

DESCRIPTION OF SYMBOLS 1 ... biological information measuring device 2 ... cuff 10 ... biological information measuring unit 20 ... fluid supply unit 30 ... motion detecting unit 40 ... instruction discriminating unit 200 ... blood pressure measuring device 210 ... main body 211 ... case 212 ... glass 213 ... back cover 215 ... Display portion 216:

Operation portion

216A, 216B, 216C: Push-type switch 221, 226: Connecting rod 230: Belt 231: First belt portion 232: Root portion 233: Tip portion 234, 235: Belt holding portion 236: Second belt Part 237 ... Root part 238 ... Tip part 239 ... Small hole 240 ... Tail lock 241 ... Stick body 242 ... Sticking rod 243 ... Connecting rod 250 ... Cuff structure 251 ... Root part 252 ... Tip part 254 ... Curly 255 ... Pressing Cuff 256 ... Back plate 257 ... sensing cuff 300 ... left wrist 300 A ... artery passing portion 301 ... radial artery 302 ... Bone artery 303 ... radius 304 ... ulna 305 ... tendon 401 ... CPU
402: Memory 407: Communication unit 408: Battery 409, 410: Pressure sensor 411: Pump drive circuit 412: Pump 415: On-off valve drive circuit 416: On-off valve 421, 423: Flexible tube 422, 424: Flow path forming member 450: External device 500: Control unit 501: Motion detection unit 502: Instruction determination unit 503: Blood pressure measurement unit 504: Fluid supply control unit 505: Blood pressure value calculation unit 506: Blood pressure measurement result output unit 511: Fluid supply unit 800: Control Unit 802 ... Instruction determination unit 807 ... Posture detection unit 811 ... Acceleration sensor

Claims

A biological information measuring apparatus for measuring biological information by pressing a measurement target region of a subject with a cuff including a fluid bag,
A motion detection unit that detects a motion of the measurement target based on a pressure signal indicating a pressure inside the fluid bag;
An instruction determination unit configured to determine an instruction content related to measurement of the biological information by the subject based on a detection result of the movement of the measurement target part.
The biological information measuring device according to claim 1, wherein the movement detecting unit detects the movement of the measurement site based on comparison between a value of a fluctuation component included in the pressure signal and a preset threshold value.
The motion detection unit outputs a detection result including the number of times the value of the fluctuation component exceeds the threshold value,
The biological information measuring apparatus according to claim 2, wherein the instruction determination unit determines the content of the instruction from the subject based on the number of times included in the detection result.
The biological information measuring device according to claim 1, wherein the motion detection unit detects the motion of the measurement site based on matching between a waveform of a fluctuation component included in the pressure signal and a reference waveform prepared in advance.
It further comprises a posture detection unit that detects the posture of the measurement target site,
The instruction determination unit determines the content of an instruction related to measurement of the biological information by the subject based on a combination of the detection result of the movement of the measurement site and the detection result of the posture of the measurement site. The biological information measuring device according to any one of claims 1 to 4.
The instruction determination unit determines an instruction to start measurement of the biological information based on a detection result of the posture of the measurement target region, and the determination unit determines the movement start of the measurement target region after the determination of the measurement start instruction. The biological information measuring device according to claim 5, wherein an instruction to stop measurement of biological information is determined.
A measurement control method executed by a biological information measurement apparatus that measures biological information by pressing a measurement target region of a measurement subject with a cuff including a fluid bag,
Detecting the movement of the measurement site based on a pressure signal indicative of the pressure inside the fluid bag;
Determining an instruction related to the measurement of the biological information by the subject based on the detection result of the movement of the target site.
A program for causing a processor to function as each unit of the biological information measurement device according to any one of claims 1 to 6.