JP6247619B2 - Biological information measuring device - Google Patents

Description

  Embodiments described herein relate generally to a biological information measuring device and a program.

Conventionally, in medical institutions and the like, arterial oxygen saturation (SpO ₂ ) is measured in order to discover sleep apnea syndrome (SAS) and respiratory failure (such as asthma). In recent years, measuring devices (pulse oximeters) for measuring SpO ₂ have been miniaturized, and there is an increasing need to continuously use measuring devices on a daily basis.

In order to meet this need, wearable devices such as a ring type capable of measuring SpO ₂ have been proposed.

JP 2007-330708 A JP 2004-121864 A

  A biological information measuring apparatus and program are provided.

The biological information measurement apparatus according to an embodiment includes an SpO ₂ measurement unit, a motion information measurement unit, a feature amount calculation unit, an action state determination unit, and a measurement interval control unit. The SpO ₂ measurement unit intermittently measures the user's SpO ₂ . The motion information measurement unit measures user motion information. The feature amount calculation unit calculates a feature amount from the motion information. The behavior state determination unit determines the user's behavior state based on the feature amount. The measurement interval control unit controls the measurement interval of the SpO ₂ measurement unit based on the behavior state.

Schematic which shows the function structure of the biological information measuring device which concerns on 1st Embodiment. Schematic which shows the hardware constitutions of the biological information measuring device of FIG. The flowchart which shows operation | movement of the biometric information measuring apparatus of FIG. Schematic which shows an example of the biometric information measuring apparatus of FIG. Schematic which shows an example of the biometric information measuring apparatus of FIG. Schematic which shows an example of the biometric information measuring apparatus of FIG. Schematic which shows the function structure of the biological information measuring device which concerns on 2nd Embodiment. The figure explaining an example of a reference value acquisition period. The figure explaining the other example of a reference value acquisition period. The flowchart which shows operation | movement of the biometric information measuring apparatus of FIG. The figure which shows an example of the measurement result by the biometric information measuring apparatus of FIG. The figure which shows the function structure of the biological information measuring device which concerns on 3rd Embodiment. The figure explaining an example of the determination method of a measuring object. The flowchart figure which shows the operation | movement of the biometric information measuring apparatus of FIG. Schematic which shows the hardware constitutions of the biological information measuring device which concerns on 4th Embodiment. Diagram showing an example of measurement results of the SpO _2. The elements on larger scale which show the wiring of a bellows part.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A biological information measurement device (hereinafter referred to as “measurement device”) and a biological information measurement program (hereinafter referred to as “measurement program”) according to the first embodiment will be described with reference to FIGS.

First, the functional configuration of the measuring apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a functional configuration of the measurement apparatus according to the present embodiment. As shown in FIG. 1, the measurement apparatus includes a motion information measurement unit 1, a feature amount calculation unit 2, a behavior state determination unit 3, a measurement interval control unit 4, and an SpO ₂ measurement unit 5.

  The motion information measuring unit 1 measures user motion information. The motion information is, for example, acceleration or angular velocity, but is not limited thereto. The motion information measurement unit 1 includes a motion information sensor such as an acceleration sensor or an angular velocity sensor (gyro sensor) that detects the motion information, and calculates motion information from an output signal of the motion information sensor. The motion information measuring unit 1 operates at all times or intermittently at a time interval of 10 seconds or less during the operation of the measuring apparatus, and measures motion information. Further, the motion information measuring unit 1 may measure one or more pieces of motion information.

  The feature amount calculation unit 2 calculates one or more feature amounts from the motion information measured by the motion information measurement unit 1. The feature amount is, for example, a body movement amount, but is not limited thereto.

  The behavior state determination unit 3 determines the user's behavior state based on the feature amount calculated by the feature amount calculation unit 2. The behavior states determined by the behavior state determination unit 2 include, for example, sleep, awakening, complete rest (no measurement device is mounted), walking, running, riding on a train / car / bus, driving a bicycle, boarding an airplane, boarding Swimming, tennis, individual sports, team sports, meals, eating and drinking, desk work, supine, and sitting.

The measurement interval control unit 4 controls the SpO ₂ measurement interval by the SpO ₂ measurement unit 5 based on the user's behavior state determined by the behavior state determination unit 3. A method for controlling the measurement interval will be described later.

The SpO ₂ measuring unit 5 intermittently measures the user's SpO ₂ at predetermined time intervals. The measurement interval of the SpO ₂ measurement unit 5 is controlled by the measurement interval control unit 4 as described above. SpO ₂ measurement unit 5 includes a SpO ₂ sensor, calculates the SpO ₂ from the output signal of the SpO ₂ sensor.

The SpO ₂ sensor includes an R light source that emits red light (R light), an IR light source that emits infrared light (IR light), and a light receiving unit. The R light source and the IR light source are, for example, LEDs, and irradiate R light and IR light respectively to the SpO ₂ measurement portion (such as a user's arm or finger). The light receiving unit is, for example, a photoelectric element, receives light transmitted through the measurement portion or reflected by the measurement portion, and outputs a signal corresponding to the intensity.

Hemoglobin (HbO2) linked to oxygen and hemoglobin (Hb) not linked to oxygen have different absorbances for R light and IR light. For this reason, the SpO ₂ measuring unit 5 can calculate SpO ₂ by obtaining the ratio of the attenuation of R light and IR light from the output signal of the light receiving unit.

Next, the hardware configuration of the measurement apparatus according to the present embodiment will be described with reference to FIG. The measurement apparatus according to this embodiment includes a computer apparatus 100. Output signals from the motion information sensor, the SpO ₂ sensor, and the like are input to the computer device 100 and subjected to predetermined processing.

  As shown in FIG. 2, the computer device 100 includes a CPU (Central Processing Unit) 101, an input interface 102, a display device 103, a communication device 104, a main storage device 105, and an external storage device 106. These are connected to each other by a bus 107.

  The CPU 101 executes a measurement program on the main storage device 105. When the CPU 101 executes the measurement program, each functional configuration described above with reference to FIG. 1 is realized.

The input interface 102 inputs operation signals from input devices such as a keyboard, a mouse, and a touch panel to the measurement device. The method of the input interface 102 is, for example, USB or Ethernet (registered trademark), but is not limited thereto. The motion information sensor and the SpO ₂ sensor may be connected to the computer apparatus 100 via the input interface 102.

The display device 103 displays a video signal output from the measurement device. The display device is, for example, an LCD (liquid crystal display), a CRT (CRT), and a PDP (plasma display), but is not limited thereto. Information such as measured SpO ₂ and measurement time can be displayed by the display device 103.

The communication device 104 is a device for the measurement device to communicate with an external device wirelessly or by wire. Information such as the measured SpO ₂ and the measurement time can be transmitted to an external device via the communication device 104. The external device is, for example, a smartphone or a server, but is not limited thereto. An output signal from the motion information sensor or the SpO ₂ sensor may be input to the computer apparatus 100 via the communication apparatus 104.

  When the measurement program is executed, the main storage device 105 stores the measurement program, data necessary for executing the measurement program, data generated by executing the measurement program, and the like. The measurement program is expanded and executed on the main storage device 105. The main storage device 105 is, for example, a RAM, a DRAM, or an SRAM, but is not limited thereto.

  The external storage device 106 stores a measurement program, data necessary for execution of the measurement program, data generated by execution of the measurement program, and the like. These programs and data are read to the main storage device 105 when the measurement program is executed. The external storage device 106 is, for example, a hard disk, an optical disk, a flash memory, and a magnetic tape, but is not limited thereto.

  Note that the measurement program may be installed in advance in the computer apparatus 100 or may be stored in a storage medium such as a CD-ROM. The measurement program may be uploaded on the Internet.

  Next, the operation of the measuring apparatus according to the present embodiment will be specifically described with reference to FIG. In the following, it is assumed that the motion information is acceleration, the feature amount is body motion amount, and the behavior state is two of sleep and awakening, but as described above, the motion information, body motion amount and behavior state are Not limited. FIG. 3 is a flowchart showing the operation of the measuring apparatus according to this embodiment.

  As shown in FIG. 3, when the measurement process by the measurement apparatus is started, in step S1, the motion information measurement unit 1 measures the acceleration of the user. That is, the motion information measurement unit 1 calculates the user's acceleration from the output signal of the acceleration sensor. The acceleration sensor is, for example, a 1-axis, 2-axis, 3-axis,... N-axis (n: natural number) acceleration sensor, but is not limited thereto. Note that the measurement processing by the measurement device is started in accordance with, for example, the timing when the power of the measurement device is turned on or a start signal from the user.

  In step S <b> 2, the feature amount calculation unit 2 calculates the body movement amount of the user from the acceleration measured by the motion information measurement unit 1. The feature amount calculation unit 2 calculates, for example, a combined acceleration such as two or three axes or an average value of the combined acceleration as the amount of body movement.

  In step S <b> 3, the behavior state determination unit 3 determines the user's behavior state from the amount of body movement calculated by the feature amount calculation unit 2. That is, it is determined whether the user is sleeping or awake. For example, the behavior state determination unit 3 can determine whether the user is sleeping by using the maximum value, average value, integral value, pattern, and the like of the amount of body movement.

  If the behavior state determination unit 3 determines that the user is awake (NO in step S4), the process proceeds to step S5. If the user determines that the user is sleeping (YES in step S4), the process proceeds to step S6. .

When the user is awake, in step S5, the measurement interval control unit 4 sets the measurement interval of the SpO ₂ measurement unit 5 to the measurement interval at awakening. The measurement interval at awakening is, for example, an arbitrary interval of 1 minute or more and 60 or less.

Control of the measurement interval by measuring interval control unit 4 may be performed by controlling the detection interval of the SpO ₂ sensor is performed by controlling an interval of calculating the SpO ₂ from the output signal of the SpO ₂ sensor May be.

On the other hand, when the user is sleeping, in step S6, the measurement interval control unit 4 sets the measurement interval of the SpO ₂ measurement unit 5 to the measurement interval during sleep. The measurement interval during sleep is shorter than the measurement interval during awakening, and is an arbitrary interval of 1 second to 10 seconds. By setting the measurement interval during sleep in this way, SAS can be diagnosed with high accuracy. The reason is as follows.

As a SAS diagnosis method, a method using an apnea / hypopnea index (AHI) is known. AHI is the total number of apneas and hypopneas per hour. Apnea is that breathing stops for 10 seconds or more, and hypopnea is that a decrease in SpO ₂ of 3% or more continues for 10 seconds or more. Apnea and hypopnea can be detected by measuring SpO _2.

If the measurement interval during sleep is longer than 10 seconds, apnea or hypopnea may occur during the measurement waiting period, and these may not be detected. On the other hand, when the measurement interval during sleep is 10 seconds or less, SpO ₂ can be measured at least once during the occurrence of apnea and hypopnea. That is, it is possible to suppress omission of apnea and hypopnea detection. For this reason, by setting the measurement interval during sleep to 10 seconds or less, AHI can be accurately measured and SAS can be diagnosed accurately.

Note that the measurement interval during sleep is preferably set to 10 seconds, for example. Measurement interval here is a SpO ₂ sensor inoperative time, SpO ₂ is not a time to SpO ₂ sensor is operating to calculate. For the SpO ₂ sensor operating time, SpO ₂ is calculated, for example, for 5 seconds, and SpO ₂ is calculated using the pulse during that time. Thereby, the diagnostic accuracy of SAS can be improved and the power consumption of the measuring apparatus can be reduced.

As another method for setting the operation time (measurement time) and the non-operation time (measurement interval) of the SpO ₂ sensor, there are the following methods. First, from the pulse rate per predetermined time of the wearer, a time for 3 to 7 consecutive beats of the wearer is calculated, and this is set as an operation time, and 1.5 to 2.5 times the operation time. Is the non-operation time. As a result, it is possible to perform accurate measurement taking into account individual differences among wearers.

  In step S5 or step S6, after the measurement interval control unit 4 sets the measurement interval, the process proceeds to step S7.

In step S7, the SpO ₂ measuring unit 5 determines whether or not the current time is the SpO ₂ measurement timing. If it is the measurement timing (YES in step S7), the process proceeds to step S8, and if it is not the measurement timing (NO in step S7), the process proceeds to step S9.

If the measurement timing, in step S8, SpO ₂ measurement section 5 measures the SpO _2. That is, the SpO ₂ measurement unit 5 irradiates the measurement portion with R light and IR light by the SpO ₂ sensor, acquires a signal from the light receiving unit that has received these transmitted light or reflected light, and SpO ₂ from the acquired signal. Is calculated.

  After step S8 or when it is not the measurement timing in step S7, the process proceeds to step S9.

  In step S9, the measurement apparatus determines whether to end the measurement process. When ending the measurement process (YES in step S9), the measurement apparatus stops the operation of each functional configuration described above and ends the measurement process. The measurement process by the measurement device is terminated according to, for example, the timing when the power of the measurement device is turned off or an end signal from the user.

  On the other hand, when the measurement process is not terminated (NO in step S9), the process returns to step S1. Thereafter, the measuring apparatus repeats the above-described steps S1 to S9 until the measurement process ends.

As described above, since the measuring apparatus according to the present embodiment intermittently measures SpO ₂ , power consumption can be reduced. As a result, it is possible to extend the continuous drive time of the measuring device and to reduce the size of the battery.

Further, the measuring apparatus for measuring SpO ₂ measurement interval of 10 seconds or less during sleep of the user, can be detected without exception apnea or hypopnea occurred during sleep. Therefore, SAS can be accurately diagnosed by using this measuring apparatus.

  Note that the measurement apparatus according to the present embodiment may be configured as a single wearable device, or may be configured as a system including a plurality of devices connected by wire or wirelessly.

  When the measuring apparatus is configured as a system including a plurality of devices, this system can be configured by, for example, the sensor unit 20 and the information processing terminal 30. The sensor unit 20 is configured by, for example, a bracelet type, a ring type, or a seal type wearable device. Moreover, the information processing terminal 30 is comprised by a sensor hub, a smart phone, or a dedicated terminal, for example.

As shown in FIG. 4, the sensor unit 20 preferably includes a motion information measurement unit 1, a feature amount calculation unit 2, and an SpO ₂ measurement unit 5. The information processing terminal 30 preferably includes the behavior state determination unit 3 and the measurement interval control unit 4. In this case, the information processing terminal 30 determines the behavior state of the user based on the feature amount received from the sensor unit 20, and generates a control signal for the SpO ₂ measurement interval based on the behavior state. The sensor unit 20 is controlled by the control signal received from the information processing terminal 30 for the SpO ₂ measurement interval. With such a configuration, the power consumption of the sensor unit 20 can be reduced.

Further, as shown in FIG. 5, the system includes a first sensor unit 20a including a motion information measuring unit 1 and a feature amount calculating unit 2, a second sensor unit 20b including an SpO ₂ measuring unit 5, You may comprise by the information processing terminal 30 provided with the state determination part 3 and the measurement space | interval control part 4. FIG. In this way, the motion information measurement section 1, and the SpO ₂ measurement unit 5, it is possible to be mounted at a place suitable for each measurement.

Furthermore, as shown in FIG. 6, an information processing terminal 30 including a motion information measurement unit 1, a feature amount calculation unit 2, a behavior state determination unit 3, and a measurement interval control unit 4, and an SpO ₂ measurement unit 5. It is also possible to realize this system by the sensor unit 20 including

  Note that the information processing terminal 30 may be installed in advance with programs that realize the functional configurations of the behavior state determination unit 3 and the measurement interval control unit 4 or may be downloaded via the Internet.

(Second Embodiment)
A measurement apparatus and a measurement program according to the second embodiment will be described with reference to FIGS. FIG. 7 is a schematic diagram illustrating a functional configuration of the measurement apparatus according to the present embodiment. As shown in FIG. 7, the measurement apparatus further includes a reference value acquisition unit 6. The functional configuration of the reference value acquisition unit 6 is realized by the computer device 100 executing a measurement program. Other configurations are the same as those of the first embodiment.

The reference value acquisition unit 6 acquires the user's SpO ₂ reference value. The reference value of a SpO _2, a SpO ₂ at the time of the user's normal. The decrease rate of SpO ₂ used when detecting apnea or hypopnea can be calculated as a decrease rate with respect to this reference value.

The reference value acquisition unit 6 acquires SpO ₂ measured during the reference value acquisition period as a reference value. The reference value acquisition period is a period set in advance as a period suitable for acquiring the reference value. The reference value acquisition period is set based on at least one of the user's behavior state and the feature amount.

  The reference value acquisition period is, for example, a period in which the behavior state determination unit 3 determines that the user's behavior state is sleep. This is because during the user's sleep, the user's body movement is small and suitable for obtaining the reference value.

Moreover, it is preferable that the reference value acquisition period is a first shallow sleep period after falling asleep among periods in which the behavior state is determined to be sleep. This is because SpO ₂ tends to decrease during the deep sleep period (the period circled in FIG. 8), whereas the first shallow sleep period after sleep (the period indicated by the arrow in FIG. 8). This is because SpO ₂ hardly decreases significantly. When the reference value acquisition period is the first shallow sleep period after falling asleep, the behavioral state determination unit 3 preferably determines shallow sleep and deep sleep as the behavioral state.

  Further, the reference value acquisition period may be a period in which the body movement amount is equal to or less than a predetermined value among the periods in which the behavior state of the user is determined to be awake by the behavior state determination unit 3. This is because even if the user is awake, it is suitable for obtaining the reference value if the amount of body movement is small (a period indicated by an arrow in FIG. 9).

  Furthermore, the reference value acquisition period may be a period of a behavior state in which the behavior state of the user determined by the behavior state determination unit 3 is expected to have little body movement. Examples of the action state with little body movement include, but are not limited to, walking, getting on a train / car / bus, boarding an airplane, boarding, eating, eating and drinking, desk work, supine, and sitting.

  Next, the operation of the measuring apparatus according to the present embodiment will be specifically described with reference to FIG. FIG. 10 is a flowchart showing the operation of this measuring apparatus. Steps S1 to S9 in FIG. 10 are the same as in the first embodiment. In the present embodiment, after step S8, the process proceeds to step S10.

  In step S10, the reference value acquisition unit 6 acquires at least one of the feature amount and the action state, and determines whether the current time is within the reference value acquisition period. If the current time is not within the reference value acquisition period (NO in step S10), the process proceeds to step S9.

On the other hand, when the current time is within the reference value acquisition period (YES in step S10), the reference value acquisition unit 6 acquires SpO ₂ measured in step S8 from the SpO ₂ measurement unit 5. The reference value acquisition unit 6 stores the acquired SpO ₂ as a reference value. Thereafter, the process proceeds to step S9.

FIG. 11 is a diagram illustrating an example of a measurement result of SpO ₂ by the measurement apparatus. In FIG. 11, the measurement result includes a measurement time, an action state at the measurement time, a measured SpO ₂ (SpO ₂ value), a reference value (reference SpO ₂ ), and a reference value flag. The reference value flag indicates whether SpO ₂ measured at that time is a reference value. The measurement device stores such measurement results in association with each measurement time.

As described above, the measuring apparatus according to the present embodiment can acquire the reference value of SpO ₂ based on the feature amount and the action state. By using the decrease rate of SpO ₂ with respect to this reference value as the decrease rate of SpO ₂ when diagnosing SAS, apnea and hypopnea with individual differences can be determined more accurately. For this reason, by using the measuring apparatus according to the present embodiment, it is possible to further improve the SAS diagnosis accuracy.

(Third embodiment)
A measurement apparatus and a measurement program according to the third embodiment will be described with reference to FIGS. FIG. 12 is a schematic diagram illustrating a functional configuration of the measurement apparatus according to the present embodiment. As shown in FIG. 12, the measurement apparatus further includes a measurement target selection unit 7 and a pulse wave measurement unit 8. The functional configurations of the pulse wave measurement unit 7 and the measurement target selection unit 8 are realized by the computer device 100 executing a measurement program. Other configurations are the same as those of the first embodiment.

  The pulse wave measurement unit 7 intermittently measures the user's pulse wave at predetermined time intervals. The measurement interval of the pulse wave measuring unit 7 can be arbitrarily set. The pulse wave measurement unit 7 includes a pulse wave sensor, and generates a pulse wave from an output signal of the pulse wave sensor. The pulse wave measurement unit 7 may calculate a pulse from the generated pulse wave.

The pulse wave sensor includes a G light source that emits green light (G light) and a light receiving unit. The G light source is, for example, an LED, and irradiates the measurement portion with G light. The light receiving unit is, for example, a photoelectric element, receives light transmitted through the measurement portion or reflected by the measurement portion, and outputs a signal corresponding to the intensity. The light receiving unit of the pulse wave sensor may be shared with the light receiving unit of the SpO ₂ sensor.

The measurement target selection unit 8 selects a measurement target by the measurement device based on at least one of the feature amount and the user behavior state. In the present embodiment, there are _two measurement objects, SpO ₂ and pulse wave. The measurement target selection unit 8 operates the SpO ₂ measurement unit 5 when SpO ₂ is selected as the measurement target, and operates the pulse wave measurement unit 7 when the pulse wave is selected as the measurement target. Therefore, in the measurement apparatus according to the present embodiment, the measurement target selected by the measurement target selection unit 8 is measured.

The measurement target selection unit 8 selects a measurement target based on the amount of body movement, for example. Specifically, the measurement target selection unit 8 compares the first threshold value and the second threshold value (> first threshold value) of the body motion amount with the body motion amount calculated by the feature amount calculation unit 2, and selects the measurement target. select. The first threshold value is the upper limit value of the body motion amount that can measure SpO ₂ with high accuracy, and the second threshold value is the upper limit value of the body motion amount that can accurately measure the pulse wave. The reason why the second threshold value is larger than the first threshold value is that the pulse wave is more robust with respect to body movement than SpO ₂ , that is, the decrease in measurement accuracy due to body movement is small.

  In the following, when the amount of body movement is equal to or less than the first threshold, the amount of body movement is referred to as small, and when the amount of body movement is greater than the first threshold and equal to or less than the second threshold, the amount of body movement is referred to as medium. When the value is larger than the threshold value, the amount of body movement is called large.

As shown in FIG. 13, the measurement target selection unit 8 selects SpO ₂ as the measurement target when the body movement amount calculated by the feature amount calculation unit 2 is small, and selects the pulse wave as the measurement target when it is medium If it is large, the measurement target is not selected.

  By selecting the measurement target in this way, the SpO2 measurement unit 5 does not operate during a period when the SpO2 measurement accuracy is low, and the pulse wave measurement unit 7 does not operate during a period when the pulse wave measurement accuracy is low. For this reason, the power consumption of the measuring apparatus can be reduced.

Note that the measurement target selection unit 8 may select SpO ₂ and pulse waves as measurement targets when the amount of body movement is small. This is because the pulse wave can be accurately measured when the amount of body movement is small.

  Further, the measurement target selection unit 8 may select a measurement target based on the behavior state. For example, the measurement target selection unit 8 sets a behavior state with a small amount of body motion, a behavior state with a medium amount of body motion, and a behavior state with a large amount of body motion, and the set behavior state and behavior state determination The measurement target may be selected by comparing the behavior state determined by the unit 3.

That is, the measurement target selection unit 8 selects SpO ₂ as a measurement target when the behavior state determined by the behavior state determination unit 3 is a behavior state with a small amount of body motion, and the behavior state with a medium amount of body motion. In some cases, a pulse wave is selected as a measurement target, and no measurement target is selected in a behavioral state with a large amount of body movement.

  The behavioral state with a small amount of body motion includes, for example, sleep, boarding on a train / car / bus, boarding an airplane, boarding, eating, eating and drinking, desk work, supine, and sitting. The behavioral state with a medium amount of body motion includes, for example, walking and driving a bicycle. Action states with a large amount of body movement include, for example, running, swimming, tennis, individual sports, and team sports. The way of dividing the behavioral state is not limited to this.

  Next, the operation of the measuring apparatus according to the present embodiment will be specifically described with reference to FIG. Hereinafter, it is assumed that the measurement target selection unit 8 selects a measurement target based on the amount of body movement. FIG. 14 is a flowchart showing the operation of the measuring apparatus according to this embodiment. Steps S1, S2, and S9 in FIG. 14 are the same as those in the first embodiment. In the present embodiment, after step S2, the process proceeds to step S12.

  In step S <b> 12, the measurement target selection unit 8 determines the size of the body movement amount calculated by the feature amount calculation unit 2. When the measurement target selection unit 8 determines that the amount of body movement is small (the amount of body movement is small), the process proceeds to step S13. When the amount of body movement is determined to be medium (in the amount of body movement), the process proceeds to step S15. If it is determined that the amount of body movement is large (the amount of body movement is large), the process proceeds to step S17.

When the amount of body movement is small, in step S13, the measurement target selection unit 8 selects SpO ₂ as the measurement target and operates the SpO ₂ measurement unit 5. At this time, the measurement target selection unit 8 does not operate the pulse wave measurement unit 7.

Thereafter, in step S14, the SpO ₂ measurement process is executed. The SpO ₂ measurement process in step S14 is the process in steps S3 to S8 in the first embodiment. After completion of the SpO ₂ measurement process, the process proceeds to step S9.

When the amount of body movement is medium, in step S15, the measurement target selection unit 8 selects a pulse wave as the measurement target and operates the pulse wave measurement unit 7. At this time, the measurement target selection unit 8 does not operate the SpO ₂ measurement unit 5. Thereafter, in step S16, the pulse wave measuring unit 7 measures the pulse wave. After measuring the pulse wave, the process proceeds to step S9.

When the amount of body movement is large, the measurement target selection unit 8 does not select the measurement target in step S17. At this time, the measurement target selection unit 8 does not operate the SpO ₂ measurement unit 5 and the pulse wave measurement unit 7. Thereafter, the process proceeds to step S9.

As described above, according to the measuring apparatus according to the present embodiment, not only SpO ₂ but also a pulse wave can be measured. Further, when the SpO ₂ and pulse wave measurement accuracy is low, the SpO ₂ measurement unit 5 and the pulse wave measurement unit 7 are not operated, so that power consumption can be reduced.

  In addition to the pulse wave measurement unit 7, the measurement apparatus according to the present embodiment includes another biological information measurement unit that measures biological information such as heart rate and body temperature in place of the pulse wave measurement unit 7. Configuration is also possible.

(Fourth embodiment)
A measurement apparatus according to the fourth embodiment will be described with reference to FIGS. The measurement apparatus according to the present embodiment is configured as a single wearable device worn on a user's arm or finger. The functional configuration of this measuring apparatus is the same as that of the first embodiment. Here, FIG. 15 is a schematic diagram illustrating a hardware configuration of the measurement apparatus 10 according to the present embodiment. As shown in FIG. 15, the measurement apparatus 10 includes a band unit 11, a housing 12, and an SpO ₂ sensor 13.

  The band unit 11 is an annular member for mounting the measuring device 10 on a mounting portion (such as a user's arm or finger). The user wears the measuring apparatus 10 through the arm or finger on the band unit 11. The band portion 11 includes a bellows portion 14.

  The bellows portion 14 is a bellows-like portion formed in a part of the band portion 11. The bellows portion 14 is extendable in the circumferential direction of the band portion 11, and at least one bellows portion 14 is provided on the band portion 11. When the user wears the measuring device 10, the bellows portion 14 fastens the band portion 11 to the user wearing portion. Thereby, the band part 11 is fixed to a user's wearing part.

  The housing 12 is fixed to a part of the band unit 11 and houses the components of the measuring device 10. For example, although not illustrated, the housing 12 includes a battery of the measuring device 10 and a computer device 100 that implements each functional configuration of the measuring device 10. As shown in FIG. 15, the display device 103 of the computer device 100 is disposed on the outer side with respect to the band unit 11 so that the user can visually recognize the measurement device 10 while wearing it.

  The housing 12 is provided with a motion information sensor 15 such as an acceleration sensor. The motion information sensor 15 is connected to the computer apparatus 100 by wiring inside the housing 12. The movement information sensor 15 and the computer apparatus 100 cooperate to realize the functional configuration of the movement information measurement unit 1.

The SpO ₂ sensor 13 is a reflection type SpO ₂ sensor and is provided on the inner peripheral side of the band portion 11. For this reason, when the user wears the measuring apparatus 10, the SpO ₂ sensor 13 is close to the user's wearing part, and SpO ₂ can be measured by reflected light.

Here, FIG. 16 is a diagram illustrating an example of a measurement result of the reflective SpO ₂ sensor. 16 (a) is a measurement result of measuring the SpO ₂ at the palm side of the finger, FIG. 16 (b) is a measurement result of measuring the SpO ₂ at the back side of the finger. As can be seen from FIG. 16, SpO ₂ can capture the heart rate more accurately when measured on the ventral side of the finger than when measured on the back side of the finger, and R light and IR light. It is possible to clearly grasp the ratio of the light attenuation. This is the same even when measuring with an arm.

For this reason, it is preferable that the measuring apparatus 10 is mounted so that the SpO ₂ sensor 13 is located on the ventral side of the finger or arm. Moreover, it is preferable that the measuring device 10 is mounted so that the housing 11 is positioned on the back side of the finger or arm so that the visibility of the display device 103 is improved. From these viewpoints, as shown in FIG. 15, the SpO ₂ sensor 13 is preferably provided on the opposite side of the band portion 11 with respect to the housing 11. Thereby, the measurement accuracy of SpO ₂ and the visibility of the display device 103 can be improved at the same time.

When the SpO ₂ sensor 13 is arranged in this way, the SpO ₂ sensor 13 is connected to the computer apparatus 100 by wiring provided in the band unit 11. The SpO ₂ sensor 13 and the computer apparatus 100 cooperate to configure the SpO ₂ measurement unit 5.

Here, FIG. 17 is a partial enlarged view showing the wiring 16 provided in the bellows portion 14 among the wiring of the SpO ₂ sensor 13. In FIG. 17, the arrow indicates the expansion / contraction direction of the bellows portion 14. As shown in FIG. 17, the wiring 16 is provided so as to be inclined with respect to the expansion / contraction direction of the bellows portion 14. By providing the wiring 16 in this way, the load applied to the wiring 16 when the bellows portion 14 expands and contracts is reduced as compared with the case where the wiring 16 is provided in parallel with the expansion and contraction direction. Can be suppressed.

As described above, according to the measuring apparatus 10 according to the present embodiment, the band portion 11 can be fixed to the mounting portion by the bellows portion 14. That is, the SpO ₂ sensor 13 can be fixed to a measurement part such as an arm or a finger. For this reason, unlike the conventional pulse oximeter, there is no need to mount the probe on the fingertip, and the movement of the fingertip is not limited by the probe at the time of mounting. Therefore, according to this embodiment, the comfort at the time of mounting | wearing of the measuring apparatus 10 can be improved.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. Further, for example, a configuration in which some components are deleted from all the components shown in each embodiment is also conceivable. Furthermore, you may combine suitably the component described in different embodiment.

1: motion information measurement unit, 2: feature quantity calculation unit, 3: behavior state determination unit, 4: measurement interval control unit, 5: SpO ₂ measurement unit, 6: reference value acquisition unit, 7: pulse wave measurement unit, 8 : Measurement object selection unit, 10: biological information measurement device, 11: band unit, 12: housing, 13: SpO ₂ sensor, 14: bellows part, 15: motion information sensor, 16: wiring, 20: sensor unit, 30 : Information processing terminal, 100: Computer device, 101: CPU, 102: Input interface, 103: Display device, 104: Communication device, 105: Main storage device, 106: External storage device, 107: Bus

Claims (10)

An SpO ₂ measurement unit that intermittently measures the user's SpO ₂ ;
A motion information measuring unit for measuring the user's motion information;
A feature amount calculation unit for calculating a feature amount from the motion information;
An action state determination unit for determining an action state of the user based on the feature amount;
A measurement interval control unit that controls a measurement interval of the SpO ₂ measurement unit based on the behavior state;
A biological information measuring device comprising: The biological information measurement device according to claim 1, wherein the measurement interval control unit sets the measurement interval to 10 seconds or less when the user is sleeping. The biological information measuring device according to claim 1, wherein the movement information measuring unit is an acceleration sensor. The biological information measuring apparatus according to claim 1, wherein the feature amount is a body movement amount. The biological information measurement according to claim 1, further comprising a reference value acquisition unit that acquires a reference value of SpO ₂ of the user based on at least one of the feature amount and the behavior state. apparatus. The biological information measurement device according to claim 5, wherein the reference value acquisition unit acquires the reference value during at least one of the user awakening and after falling asleep. The biological information measurement device according to claim 1, further comprising a pulse wave measurement unit that intermittently measures the pulse wave of the user. The biological information measurement device according to claim 1, further comprising a measurement target selection unit that selects a measurement target based on at least one of the feature amount and the behavior state. An annular band portion having a bellows portion formed in a stretchable bellows shape;
An SpO ₂ sensor provided on the inner peripheral side of the band part;
A motion information sensor for measuring motion information;
The biological information measuring device according to any one of claims 1 to 8, further comprising: The biological information measuring device according to claim 9, wherein the bellows part has a wiring provided to be inclined with respect to an expansion / contraction direction.

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