JP7343313B2 - Biological information measuring device - Google Patents

Description

The present invention relates to a biological information measuring device that measures biological parameters such as percutaneous arterial oxygen saturation (SpO ₂ ) as biological information.

A pulse oximeter that measures percutaneous arterial blood oxygen saturation (SpO ₂ ) is known as a biological information measuring device that measures biological parameters. A pulse oximeter is a medical device that uses light to measure percutaneous arterial oxygen saturation (SpO ₂ ) non-invasively. It is configured to be attached to the body part.

A typical pulse oximeter is equipped with a light-emitting element that emits, for example, red light and infrared light toward the part where it is attached, and a light-receiving element that detects the light that has passed through the part of the body that is attached to the lower housing. It is provided. Since hemoglobin in blood has different absorbance for red light and infrared light depending on whether it is bound to oxygen or not, the light emitted by the light-emitting element is analyzed by measuring the light that is transmitted or reflected by a fingertip etc. using a light-receiving element. By doing so, percutaneous arterial oxygen saturation can be measured.

In recent years, with the miniaturization of electronic components, pulse oximeters have also become smaller and lighter, and are now being used for purposes other than the operating room, such as testing for respiratory diseases by patients themselves at home, and for use in visiting nurses. It is possible. Miniaturized pulse oximeters include a handheld type that can be held in the hand, a one-hand grip type that can be held with one hand, a wristwatch type, and an integrated finger type that has a light-emitting element and a light-receiving element attached to the fingertip as well as a display unit. Various types of pulse oximeters are known.

For example, the pulse oximeter disclosed in Patent Document 1 is a small and lightweight clip-type pulse oximeter that can be worn on a fingertip. This pulse oximeter includes a probe unit that uses a light-emitting element and a light-receiving element to obtain percutaneous arterial blood oxygen saturation (blood oxygen saturation), and a probe unit that measures and analyzes the acquired biological signals to measure percutaneous arterial blood oxygen saturation. It is integrated with a main body that measures and records oxygen saturation.

Japanese Patent Application Publication No. 2007-167184

By the way, pulse oximeters are known to be used at home to treat COPD (Chronic Obstructive Pulmonary Disease) through home oxygen therapy (HOT). Home oxygen therapy is a method used to improve a patient's percutaneous arterial oxygen saturation values. Home oxygen therapy is generally performed by supplying high-concentration oxygen into the patient's body using an oxygen concentrator, which is a type of oxygen supply device. In this case, the patient installs an oxygen concentrator at home, and when at home, inhales high-concentration oxygen from the oxygen concentrator according to the doctor's prescription. Physicians who have decided to prescribe oxygen flow rate, etc. for a patient should monitor the progress of home oxygen therapy and revise the prescription as appropriate in order to improve the oxygen saturation level and improve the patient's QOL (Quality of Life). ).

Therefore, the doctor not only examines the patient's condition, but also needs to check the accuracy of the prescription he or she has decided on, the patient's compliance with the prescription, etc. (hereinafter referred to as "progress of home oxygen therapy"). Pulse oximeters are used to confirm the prognosis of such patients.

"Physical activity" is one of the parameters related to the prognosis of COPD patients, and in recent years, pulse oximeters that have the function of a pedometer that measures the number of steps taken, which is an index of the patient's physical activity, have become available. It has been realized.

Since the pulse oximeter, which has a pedometer function, cannot predict when a patient will start walking, it is configured to be powered on at all times and can be used repeatedly by being charged.

However, since the power is always on even when the patient is not wearing the pulse oximeter or walking, power is always consumed even when it is not functioning as a pedometer, and the power consumption as a pulse oximeter increases. becomes larger.

Even with rechargeable pulse oximeters, patients must charge and use them daily to ensure uninterrupted and convenient percutaneous arterial oxygen saturation measurements. be. Patients sometimes forget to charge their batteries, so it is desirable for pulse oximeters used by patients to have as little power consumption as possible, even if they can measure steps.

The present invention has been made in view of these points, and has an object to be able to measure the amount of activity such as the number of steps, reduce power consumption, and efficiently and suitably measure the amount of activity and biological information. The purpose is to provide a biological information measuring device that can perform

The biological information measuring device of the present invention includes:
A biological information measuring device that can be carried and used by a user,
a biological information measurement unit that is attached to a measurement site of the user and measures biological information of the user;
an activity amount measurement unit having an acceleration sensor and measuring the amount of activity including the number of steps of the user based on the output of the acceleration sensor;
a drive source that is a main driving power source of the biological information measuring device and supplies power to the biological information measuring section and the activity amount measuring section to enable measurement of each;
another drive source that has a smaller power supply capacity and power consumption than the drive source, supplies power to the acceleration sensor to drive the acceleration sensor, and causes the acceleration sensor to detect a change in the state of the biological information measuring device;
has
The drive source supplies power to the acceleration sensor instead of the other drive source when a change in the state of the biological information measuring device is detected based on the output of the acceleration sensor driven by the other drive source . Then, a configuration is adopted in which power is started to be supplied to the activity amount measurement section to enable the activity amount measurement section to measure the activity amount, but power is not supplied to the biological information measurement section.

According to the present invention, a biological information measuring device is realized that is capable of measuring the amount of activity such as the number of steps, reduces power consumption, and can efficiently and suitably measure the amount of activity and biological information. do.

1 is an external view of a pulse oximeter which is an example of a biological information measuring device according to an embodiment of the present invention. FIG. 3 is a diagram showing the pulse oximeter in a state where the finger insertion port is open. It is a schematic side view which shows the opening/closing detection part of the same pulse oximeter. It is a block diagram showing the main part configuration of the same pulse oximeter. It is a figure which shows the operation|movement which measures percutaneous arterial blood oxygen saturation with the same pulse oximeter. It is a figure which shows the operation|movement which measures percutaneous arterial blood oxygen saturation with the same pulse oximeter. It is a flowchart which shows the power supply operation|movement of the same pulse oximeter.

Hereinafter, embodiments of the present invention will be described in detail using the drawings.

FIG. 1 is a diagram showing an example of the appearance of a pulse oximeter, which is an example of a biological information measuring device according to an embodiment of the present invention. The pulse oximeter 100 is a type of pulse oximeter that is worn on a fingertip, in which a probe part and a main body part are integrated as an upper housing and a lower housing, and a power supply part is housed therein. The pulse oximeter 100 of this embodiment is used, for example, in monitoring the progress of home oxygen therapy using an oxygen concentrator. The pulse oximeter 100 used in this case is used as an example of the amount of activity that is used as an index of physical activity as a judgment material for checking the progress of the patient's home oxygen therapy (confirming the prognosis). It has a step count function that measures the number of steps. In this embodiment, a pulse oximeter will be described as an example of a biological information measuring device, but the present invention is not limited to this, and any biological information measuring device that measures biological parameters with a clip-shaped probe part can be used. It may be a device.

The pulse oximeter 100 shown in FIGS. 1 to 3 has a clip-shaped probe section, and the probe section is connected to an upper housing (opening/closing part) 110 and a lower housing (opening/closing part) via a hinge part 130. part) 120. The hinge portion 130 is provided to generate a rotational force in a direction to close the upper housing 110 and the lower housing 120. As a result, the pulse oximeter 100 pinches the patient's finger Y inserted in the direction of the arrow into the finger insertion opening 140 between the upper housing 110 and the lower housing 120 with an appropriate force (Figs. (see 6). That is, the upper housing 110, the lower housing 120, and the hinge part 130 are removably attached to the patient's finger Y as a whole.

The pulse oximeter 100 also includes a display 112 as a display section on the upper surface of the upper housing 110. Although not shown, in the pulse oximeter 100, a battery accommodating portion for accommodating a battery (corresponding to a first power source) as a main driving power source is provided in the rear surface of the upper housing 110 with an opening. is closed by a battery cover in a watertight manner so that it can be opened and closed. In the area covered by the battery lid, for example, an externally connectable connector (not shown) such as a micro USB connector is provided near the battery accommodating portion. The externally connectable connector allows data to be sent and received from an external device via an adapter (not shown).
The display 112 displays time, measured values, operating status, and the like. The display 112 displays percutaneous arterial oxygen saturation (SpO ₂ :hereinafter also referred to as "arterial oxygen saturation"), pulse wave, pulse rate, number of steps, etc. as measured values under the control of the control unit 180. The display 112 may display measurement values in each of a plurality of modes, such as a pedometer mode and a percutaneous arterial oxygen saturation measurement mode (also referred to as "arterial oxygen saturation measurement mode").

Further, the display 112 can display the remaining battery level depending on the mode. As a specific display form, the display 112 can easily display the remaining battery level of the main battery of the first power supply section 162 (see FIG. 4) housed in the pulse oximeter 100. It is shown schematically as follows.
During percutaneous arterial oxygen saturation measurement, the display 112 displays the measured percutaneous arterial oxygen saturation in units of "% SpO ₂ " as a display screen in the arterial oxygen saturation measurement mode. In addition to this, the display 112 displays the remaining battery level, the pulse wave displayed as a bar graph, and the pulse rate measured as "number + PR bpm". Note that the length of the bar in the bar graph corresponds to the detection intensity of the detected pulse wave. Further, when the perfusion index (PI) measured together with the percutaneous arterial oxygen saturation is not sufficient, for example, the number of the percutaneous arterial oxygen saturation is blinked. Further, in the step counting mode, the number of steps may or may not be displayed on the display as the step counting mode display screen.

During the percutaneous arterial blood oxygen saturation measurement, the patient can confirm the measured value of the percutaneous arterial blood oxygen saturation and other information on the display 112. Further, the measured value is recorded in the data storage section 125 (see FIG. 4).

Note that when the percutaneous arterial blood oxygen saturation is measured and recorded, the patient may be informed of this through a recording notification. Furthermore, if the continuous wearing time is too long, a warning notification may be provided to notify the user of this fact.

FIG. 4 is a block diagram showing an example of the configuration of the pulse oximeter 100.

The pulse oximeter 100 in FIG. 4 includes a percutaneous arterial blood oxygen saturation measurement section (hereinafter referred to as "oxygen saturation measurement section") 150, a first power supply section (drive source) 162, and a second power supply section (drive source). 164, a clock/calendar function section 165, a step counting section 166, an opening/closing detection section 168, a control section 180, a display (display section) 112, a data communication section 124, and a data storage section 125.

The oxygen saturation measuring section 150 has a light emitting element 152 and a light receiving element 154, and the light emitting element 152 and the light receiving element 154 function as a probe section that measures percutaneous arterial blood oxygen saturation as so-called biological information. The oxygen saturation measurement unit 150 measures the percutaneous arterial blood oxygen saturation as well as the pulse rate (that is, pulse wave measurement value).
The light emitting element 152 emits red light or infrared light and transmits it to a specific part of the patient (eg, fingertip, toe, etc.), and the light receiving element 154 detects the transmitted light to obtain a detection signal. The oxygen saturation measurement section 150 outputs the detection signal to an oxygen saturation measurement circuit (not shown) of the control section 180, and the oxygen saturation measurement circuit measures the oxygen saturation and pulse rate based on the detection signal. Ru.

In this embodiment, the light emitting element 152 and the light receiving element 154 are arranged in the upper housing 110 and the lower housing 120 that constitute the finger insertion opening 140. The light emitting element 152 is, for example, a light emitting diode, and the light receiving element 154 is, for example, a photodiode. The light emitting diodes emit light of different predetermined wavelengths under drive control of the control unit 180 (specifically, a light emitting drive circuit (not shown) of the control unit 180). When the photodiode receives light of two predetermined wavelengths, it outputs a current signal corresponding to the amount of received light to the control unit 180 (specifically, the current-voltage conversion circuit of the control unit 180). The light emitted and received by the light emitting element 152 constituting the probe section is, for example, infrared light and red light. The light emitting element 152 and the light receiving element 154 are driven by power supplied from the first power supply section 162.

The first power supply unit 162 is a main driving power supply for the pulse oximeter 100, and includes various parts of the pulse oximeter 100, such as the control unit 180, the opening/closing detection unit 168, the light emitting element 152 and the light receiving element 154 of the oxygen saturation measurement unit 150. etc. to drive each of them.

In this embodiment, the first power supply section 162 is a dry battery, and is replaceably housed in a battery accommodating section that is closed by a battery lid.

The second power supply section 164 has a smaller power supply capacity and lower power consumption than the first power supply section 162. The second power supply unit 164 is a so-called internal battery that uses a button battery or the like, and is used for storing data in a backup memory such as a BIOS in a watch or pulse oximeter 100. In the present embodiment, the second power supply section 164 supplies power to the clock/calendar function section 165 and is in a state where power is not supplied to each section from the first power supply section 162, that is, when the pulse oximeter 100 is powered off. In this state, power is supplied to the acceleration sensor 170.

The clock/calendar function section 165 measures and displays time/calendar. For example, in the pulse oximeter 100, the measurement date and time is stored as the date and time indicated by the clock/calendar function unit 165 at the time when the oxygen saturation measuring unit 150 measured the oxygen saturation and pulse. The clock/calendar function section 165 is driven by power supply from the second power supply section 164.

The step count measuring unit 166 measures the number of steps taken by the patient. In the present embodiment, the step count measurement section 166 includes an acceleration sensor 170 and a step count circuit (not shown) of the control section 180, and uses the acceleration sensor 170 to measure the acceleration of the pulse oximeter 100.

Acceleration sensor 170 detects acceleration (based on tilt and displacement due to movement) of pulse oximeter 100 and outputs it to control unit 180 . The control unit 180 measures the number of steps taken by the patient based on the output of the acceleration sensor 170. That is, the control unit 180 functions, together with the acceleration sensor 170, as a step count measuring unit that measures the number of steps walked by the patient. Acceleration sensor 170 detects whether pulse oximeter 100 is stationary or moving.

The acceleration sensor 170 transmits the detected measurement result to the control unit 180, and a step count measurement circuit (not shown) of the control unit 180 measures the number of steps. To measure the number of steps by the acceleration sensor 170, for example, a three-axis acceleration sensor is applied to the acceleration sensor 170, and the total value of acceleration in the three-axis directions is used to measure the number of steps of the patient. Note that the patient's walking can also be determined by measuring the number of steps.

The acceleration sensor 170 is configured to operate the first power supply section 162 and the second power supply section 164 from the time when the pulse oximeter 100 is used, that is, from the time when the first power supply section 162 and the second power supply section 164 are attached to the pulse oximeter for the first time. Power is supplied from at least one side. In this embodiment, acceleration sensor 170 is driven by power supplied from second power supply section 164 from the time when pulse oximeter 100 starts to be used.

The open/close detector 168 detects the open/close states of the upper housing 110 and the lower housing 120 and outputs the detected status to the controller 180 . That is, before measuring the percutaneous arterial blood oxygen saturation in the pulse oximeter 100, the opening/closing detection unit 168 drives the control unit 180 and the oxygen saturation measuring unit 150 to make it possible to measure the oxygen saturation. . The opening/closing detection section 168 includes, for example, a magnetic sensor 172 such as a Hall element and a magnet 174. The magnetic sensor 172 determines whether the opening/closing parts (the upper housing 110 and the lower housing 120) are open or closed for oxygen saturation measurement based on changes in magnetic flux depending on the distance between the upper housing 110 and the lower housing 120. Conditions can be detected. Note that the magnetic sensor 172 and the magnet 174 may be placed in any position as long as the open/closed states of the upper housing 110 and the lower housing 120 are detected. In the pulse oximeter 100 shown in FIG. 172 and magnet 174 may be provided in opposite positions.

The control unit 180 includes a CPU, RAM, and ROM. The control unit 180 performs mode settings, calculation of measured values, and control of each part of the pulse oximeter 100 by executing a control program stored in a storage medium such as a ROM.
The control unit 180 includes an oxygen saturation measurement circuit (not shown) that measures oxygen saturation and pulse rate (that is, pulse wave measurement values). The control unit 180 drives an oxygen saturation measurement circuit (not shown) using the detection result of the opening/closing detection unit 168 (here, the detection result of the acceleration sensor 170) as a trigger, and determines the ratio of oxyhemoglobin to the total hemoglobin in the arterial blood. , and detect changes in absorbance that are synchronized with the pulse of arterial blood. By converting this detection result into digital data, the control unit 180 obtains the oxygen saturation measurement value and the pulse rate measurement value. The oxygen saturation measurement circuit includes, for example, a current-voltage conversion circuit, a demodulation circuit, a signal processing circuit, a light emission drive circuit, and the like. The current-voltage conversion circuit converts the current signal input from the oxygen saturation measuring section 150 into a voltage signal, and outputs the voltage signal to the demodulation circuit. The demodulation circuit receives the signal input from the light emission drive circuit, separates the voltage signal input from the current-voltage conversion circuit into components corresponding to the above-mentioned wavelengths, and demodulates the two observation signals. The demodulation circuit then outputs the demodulated observation signal to the signal processing circuit. The signal processing circuit performs predetermined signal processing (for example, amplification and A/D conversion) on the two observation signals input from the demodulation circuit, and calculates the processed observation signal. The light emitting drive circuit causes two light emitting diodes, which are light emitting elements 152, to emit light under the control of the CPU.

The control unit 180 functions as a step count measuring unit 166 together with the acceleration sensor 170, and measures the number of steps based on data from the acceleration sensor 170. The control unit 180 displays the measured number of steps on the display 112 and records it in the data storage unit 125.

The control unit 180 displays the arterial blood oxygen saturation measurement mode and the step count measurement mode on the display 112 based on the signals input from each unit. The control unit 180 drives the oxygen saturation measuring unit 150 to a state where oxygen saturation measurement can be started by causing the light emitting element 152 to emit light and receiving the light at the light receiving element 154 based on the signal from the magnetic sensor 172. do. When the pulse oximeter 100 is in a stopped state, when a signal indicating movement of the pulse oximeter 100 is input from the acceleration sensor 170, each unit that enables the step counting unit 166 from the first power supply unit 162 via the control unit 180. Supplies power to the
Further, the control unit 180 stops counting steps while measuring percutaneous arterial oxygen saturation. Furthermore, when measuring the transcutaneous arterial blood oxygen saturation during step count measurement, the step count measurement is stopped.

The data communication unit 124 is an interface for communicably connecting the pulse oximeter 100 and, for example, an oxygen concentrator or an external device. The connection between the pulse oximeter 100 and the oxygen concentrator and the connection between the pulse oximeter 100 and an external device such as a home oxygen therapy management device are performed using a short-range wireless communication method such as Bluetooth (registered trademark). This is done by wireless communication based on The pulse oximeter 100 and the oxygen concentrator are not connected to each other so that they can communicate at all times, but can communicate while they are close to each other and a wireless communication channel is established.

The data storage section 125 includes a rewritable nonvolatile memory (not shown) such as a flash memory, and can record measurement results under the control of the control section 180.

The driving operation of this embodiment will be explained.

FIG. 7 is a flowchart showing an example of the operation of the pulse oximeter 100.

The operation of the pulse oximeter 100 is controlled by the control unit 180 as described above. Further, the control unit 180 measures the percutaneous arterial blood oxygen saturation level, measures the pulse wave, pulse rate, etc., and records and displays these measured values. Here, the function of a pedometer that automatically turns on the main power of the pulse oximeter 100 in a shutdown state, that is, in a state where the main power is not turned on and measures the number of steps taken while walking, will be described.

The pulse oximeter 100 first determines whether the posture has changed from a resting state, such as a state in which the pulse oximeter 100 is placed at a predetermined location. That is, in step S10, it is determined whether the acceleration sensor 170 has detected acceleration information of the pulse oximeter 100. When the pulse oximeter 100 is in the shutdown state, the acceleration sensor 170 always receives power saving power from the second power supply section 164. In this state, the acceleration sensor 170 detects whether there is a change in the posture of the pulse oximeter 100 from its resting state, that is, whether there is a displacement of the pulse oximeter 100.

In step S10, if acceleration information is detected, that is, if displacement of the pulse oximeter 100 is detected, the process moves to step S12. In step S12, the main power of the pulse oximeter 100 is turned on, and the first power supply section 162 starts supplying power to each section, and the first power supply section 162 supplies power to the acceleration sensor 170. That is, the first power supply section 162 starts supplying power to the step count measurement section 166 (including the acceleration sensor 170) and the control section 180 so that the step count can be measured. Specifically, in step S12, the acceleration sensor 170 that has detected the acceleration information outputs a signal to the first power supply section 162, and the first power supply section 162 that receives the signal starts up and supplies power to the control section 180 and each section. supply Thereby, in step S14, the control unit 180 starts measuring the number of steps together with the acceleration sensor 170 as the step count measurement unit 166. Further, by the first power supply unit 162 supplying power to the control unit 180, the control unit 180 switches the power supply of the acceleration sensor 170 from the second power supply unit 164 to the first power supply unit 162. Further, the control unit 180 may perform step counting mode display control to display the measured value of the number of steps on the display 112. Note that in this embodiment, power is supplied to the control unit 180 from the first power supply unit 162, so that the pulse oximeter 100 is powered on, and the arterial blood oxygen saturation measurement unit (specifically, the light emitting element 152 ) will start up when power is supplied.

The pulse oximeter 100 is carried by a patient, and when the patient walks, the power is automatically turned on and the pulse oximeter 100 becomes ready to measure the number of steps. Note that in this state, power is not supplied to the light emitting element 152 and the light receiving element 154, and the transcutaneous arterial blood oxygen saturation measurement mode is not set. This makes it possible to efficiently secure power when measuring percutaneous arterial oxygen saturation.

Then, as shown in step S16, it is determined whether there is no output from the acceleration sensor 170 even after a certain period of time has elapsed, and if there is no acceleration information from the acceleration sensor 170 for a certain period of time, measurement by the pulse oximeter is stopped. The processing is terminated.

As described above, when the pulse oximeter 100 according to the present embodiment is lifted or carried around to measure the number of steps while walking, the pulse oximeter 100 automatically switches from the power off to the power on. The device enters the state and starts counting the number of steps. In other words, even if power is not being supplied to each of the main components of the pulse oximeter 100 from the first power supply section 162, which is the main power supply, through the control section 180, the number of steps can be determined by detection by the acceleration sensor 170. A power source for functioning as the measuring section 166 is input. For example, the information is displayed on the display 112.

Further, if walking is not performed for a certain period of time, the power supplied from the first power supply section 162 to each section including the acceleration sensor 170 is turned off, and the power supply to the acceleration sensor 170 is stopped from the first power supply section 162. 2 power supply unit 164, and the acceleration sensor 170 returns to the standby state for measuring acceleration information. Thereby, when the pulse oximeter 100 is not functioning as a pedometer, it is possible to efficiently and automatically save power.

Moreover, this embodiment can be implemented with various modifications other than the above-mentioned example. For example, in the above configuration and operation of the present embodiment, a patient as a user carries or wears a device to measure biological parameters and an amount of activity, but when not carrying a measurement, there is no need to carry or wear another device. It can also be realized in various biological information measuring devices. For example, the configuration and operation of this embodiment can be applied to all medical devices that have a function to measure the amount of activity such as a step counting function, and a function to measure biological parameters such as percutaneous arterial blood oxygen saturation or pulse wave. Applicable.

Furthermore, in this embodiment, a portable pulse oximeter is used as an example of the biological information measuring device, but the biological information measuring device may also be a portable small electrocardiograph, an activity meter, etc. It may be. As described in Japanese Unexamined Patent Application Publication No. 2007-209608, a portable compact electrocardiograph has a main body equipped with electrodes that can be contacted with the patient's measurement area (for example, the hand and chest) when measuring the patient's electrocardiogram. has. In this case, the detection unit has a configuration that can detect contact of the measurement site with the electrode as a state change of the biological information measuring device related to the start of measurement of the biological parameter. Contact of the measurement site with the electrode can be detected, for example, by detecting a change in impedance of the electrode when the measurement site contacts the electrode. At this time, the plurality of electrodes detects contact with the measurement site, and causes the control unit to start measuring biological parameters via the electrodes. As a result, electrocardiogram information is not acquired until the device is attached to the measurement site, and power consumption can be reduced.

The embodiments of the present invention have been described above. Note that the above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the description of the configuration of the device and the shape of each part is merely an example, and it is clear that various changes and additions can be made to these examples within the scope of the present invention.

The biological information measuring device according to the present invention is capable of measuring the amount of activity such as the number of steps taken, reduces power consumption, and can measure the amount of activity and biological parameters such as percutaneous arterial oxygen saturation. It is useful as a portable pulse oximeter, which has the effect of being able to be efficiently and suitably executed, is driven by a primary or secondary battery, and has a function of measuring the number of steps as an amount of activity.

100 pulse oximeter 110 upper housing 112 display 120 lower housing 124 data communication section 125 data storage section 130 hinge section 140 finger insertion port 150 oxygen saturation measuring section (biological information measuring section)
152 Light emitting element 154 Light receiving element 162 First power supply section 165 Clock/calendar function section 164 Second power supply section 166 Step count measurement section (activity measurement section)
168 Open/close detection section 170 Acceleration sensor 172 Magnetic sensor 174 Magnet 180 Control section

Claims (4)

A biological information measuring device that can be carried and used by a user,
a biological information measurement unit that is attached to a measurement site of the user and measures biological information of the user;
an activity amount measurement unit having an acceleration sensor and measuring the amount of activity including the number of steps of the user based on the output of the acceleration sensor;
a drive source that is a main driving power source of the biological information measuring device and supplies power to the biological information measuring section and the activity amount measuring section to enable measurement of each;
another drive source that has a smaller power supply capacity and power consumption than the drive source, supplies power to the acceleration sensor to drive the acceleration sensor, and causes the acceleration sensor to detect a change in the state of the biological information measuring device;
has
The drive source supplies power to the acceleration sensor instead of the other drive source when a change in the state of the biological information measuring device is detected based on the output of the acceleration sensor driven by the other drive source . and starts supplying power to the activity amount measurement unit to enable the activity amount measurement unit to measure the activity amount, while not supplying power to the biological information measurement unit;
Biological information measuring device. The biological information measurement unit has a main body that is attached to the measurement site of the user,
The main body is provided with a detection section that detects attachment to the measurement site,
When the detection unit detects attachment to the measurement site, the drive source starts supplying power to the biological information measurement unit to enable the biological information measurement unit to measure biological information.
The biological information measuring device according to claim 1. The drive source starts supplying power to the detection unit when movement of the biological information measurement device is detected based on the output of the acceleration sensor, and enables the detection unit to perform detection . do,
The biological information measuring device according to claim 2. The biological information includes arterial oxygen saturation,
The biological information measuring device according to any one of claims 1 to 3 .

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