JP2022082345A - Portable terminal, blood pressure measurement method and blood pressure measurement program - Google Patents

Abstract

To easily allow compression along a compression pattern prescribed with blood pressure measurement to be performed with a fingertip.SOLUTION: A portable terminal comprises: a first sensor which is provided on a back surface of a housing formed into a plate shape and compressed with the first finger; a second sensor which detects pressing force applied to the first sensor; a touch screen which is provided on the front surface of the housing; and a processing unit which measures the blood pressure on the basis of biological information acquired from the first finger by the first sensor. The processing unit displays a guide image guiding the position of the second finger holding the housing with the first finger on the touch screen, moves the guide image in the prescribed direction, acquires the pressing force detected by the second sensor, and measures the blood pressure on the basis of biological information acquired from the first sensor when a relation between the position of the guide image and the pressure detected by the second sensor satisfies a prescribed compression pattern.SELECTED DRAWING: Figure 4

Description

The present invention relates to a mobile terminal, a blood pressure measuring method and a blood pressure measuring program.

In recent years, electronic devices such as mobile terminals having a health care function for measuring a user's blood pressure, heartbeat, etc. have been developed.

For example, Patent Document 1 proposes a biometric information analyzer including two pulse wave sensors arranged so that pulse wave signals can be detected from two points having different distances from the heart. Patent Document 2 proposes a contact-type blood pressure measuring device that improves the accuracy of blood pressure measurement from a finger by displaying a guideline indicating the pressure applied to the sensor at the time of blood pressure measurement on a display. In Patent Document 3, the contact area between the sensor unit and the subject is estimated based on the information detected by the fingerprint sensor, and the biological information is acquired based on the estimated contact area and the pulse wave signal detected by the sensor unit. Information measuring devices have been proposed.

JP-A-2017-018587 Japanese Unexamined Patent Publication No. 2018-102906 Japanese Unexamined Patent Publication No. 2020-0188337

Since blood pressure is one of the important vital sign information indicating the circulatory dynamics of the living body, blood pressure measurement is useful for grasping the health condition. There are roughly two types of blood pressure measuring methods, a non-invasive blood pressure measuring method and an open blood pressure measuring method, which are put into practical use. As a non-invasive blood pressure measurement method, many electronic sphygmomanometers based on the oscillometric method, which pressurize the upper arm and wrist with a cuff to detect the vibration of the cuff due to pulse waves, are on the market.

As an oscillometric method, in addition to the decompression measurement method in which the cuff attached to the upper arm or wrist is quickly pressurized to a predetermined pressure and then the vibration of the cuff due to the pulse wave is detected while gradually depressurizing, the living body is gradually added. There is a linear pressurization measurement method (also referred to as iNIBP (registered trademark)) that detects a pulse wave during pressurization while pressurizing and stops pressurization to a living body when systolic blood pressure can be measured. In the latter linear pressurization measurement method, the pressurization to the living body can be stopped when the systolic blood pressure can be measured, so that it is not necessary to pressurize the living body to a uniform pressure as in the decompression measurement method. Therefore, the blood pressure can be measured in a shorter time than when the living body is pressurized to a predetermined pressure as in the decompression measurement method.

Since the oscillometric method pressurizes the living body in this way and measures the blood pressure from the pulse wave in the pressurized portion, for example, the subject is pressed with a photoelectric pulse wave sensor and a pressure sensor with a fingertip, and the fingertip is used. It is also possible to measure the blood pressure value from the pulse wave of. Therefore, for example, if a photoelectric pulse wave sensor and a pressure sensor are provided in an electronic device such as a smartphone that is carried on a daily basis, the user of the electronic device can easily measure the blood pressure.

However, in the oscillometric method, the pressing force of the living body needs to follow a predetermined pressurizing pattern. However, it is not easy to adjust the pressing force of the fingertip so as to follow a predetermined pressurizing pattern by adjusting the force of the fingertip.

One aspect of the disclosed technique is to provide a portable terminal, a blood pressure measuring method and a blood pressure measuring program capable of easily performing pressurization according to a pressurizing pattern defined by blood pressure measurement with a fingertip. The purpose.

One aspect of the disclosed technique is exemplified by the following mobile terminals. This portable terminal is provided on the back surface of a plate-shaped housing, and has a first sensor that is pressurized by a first finger and a second sensor that detects the pressure applied to the first sensor. A touch screen provided on the front surface of the housing, and a processing unit for measuring blood pressure based on biological information acquired from a first finger by a first sensor. The processing unit displays a guide image on the touch screen that guides the position of the second finger that sandwiches the housing together with the first finger, moves the guide image in a predetermined direction, and presses the pressure detected by the second sensor. The blood pressure is measured based on the biological information acquired from the first sensor when the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern.

According to the disclosed technique, it is possible to easily apply pressure with a fingertip according to a predetermined pattern defined in blood pressure measurement.

FIG. 1 is a diagram illustrating the appearance of a smartphone according to an embodiment. FIG. 2 is a diagram showing an example of the hardware configuration of the smartphone used in the embodiment. FIG. 3 is a diagram illustrating a measurement method for blood pressure measurement by the oscillometric method. FIG. 4 is a diagram showing an example of a processing block of a smartphone used in the embodiment. FIG. 5 is a diagram illustrating a state in which an index is displayed in the embodiment. FIG. 6 is a diagram schematically showing the guidance of the finger position by the guide unit in the embodiment. FIG. 7 is a diagram illustrating a usage mode of the smartphone according to the embodiment. FIG. 8 is a diagram showing an example of a processing flow of a smartphone according to an embodiment. FIG. 9 is a diagram showing an example of a processing block of a smartphone according to the first modification. FIG. 10 is a diagram showing an example of a processing flow of a smartphone according to the first modification.

<Embodiment>
The configurations of the embodiments shown below are examples, and the disclosed techniques are not limited to the configurations of the embodiments. The portable terminal according to the embodiment is provided, for example, on the back surface of a plate-shaped housing, and detects a first sensor pressurized by a first finger and a pressure applied to the first sensor. It includes a second sensor, a touch screen provided on the front surface of the housing, and a processing unit that measures blood pressure based on biological information acquired from the first finger by the first sensor. Then, the processing unit displays a guide image that guides the position of the second finger that sandwiches the housing together with the first finger on the touch screen, moves the guide image in a predetermined direction, and detects it by the second sensor. The pressure is acquired, and the blood pressure is measured based on the biological information acquired from the first sensor when the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern.

When the blood pressure is measured by the oscillometric method, if the pressure applied to the first sensor is not performed according to a predetermined pressure pattern, the measurement accuracy of the blood pressure may be lowered or the blood pressure may not be measured. When the housing of the mobile terminal is tilted in the front-rear direction due to the pressure applied by the first finger to the first sensor, when the second finger moves according to the guidance image, the second finger moves in response to the movement of the second finger. The pressure that one finger applies to the first sensor changes. Then, in this mobile terminal, the blood pressure is measured based on the biological information acquired from the first sensor when the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern. do. That is, according to this mobile terminal, it is possible to easily perform pressurization according to the pressurization pattern specified in blood pressure measurement with a fingertip by a simple operation of moving according to a guide image on a touch screen. It becomes.

Hereinafter, an embodiment in which the mobile terminal is applied to a smartphone will be further described with reference to the drawings. FIG. 1 is a diagram illustrating the appearance of a smartphone according to an embodiment. FIG. 1 exemplifies the appearance seen from one side (the appearance on the front side) and the appearance seen from the other side (the appearance on the back side). In FIG. 1, the front side and the back side of the smartphone 100 are arranged interchangeably by arrows, and are illustrated. The smartphone 100 has a plate-shaped housing 110. The distance (thickness) between the front surface and the back surface of the housing 110 is shorter than the external dimensions of the front surface or the back surface. In FIG. 1, it is assumed that the upper side facing the paper surface is the upper side of the housing 110 and the lower side facing the paper surface is the lower side of the housing 110.

A touch screen 113 is provided on the front surface of the housing 110. The touch screen 113 includes a display and a touch panel arranged so as to be superimposed on the entire surface of the display. By providing the touch screen 113, the smartphone 100 can realize a touch operation with a finger or the like. The speaker 111 is provided at the upper center position of the touch screen 113. A calling microphone 112 is provided at the lower center position of the touch screen 113.

A photoelectric pulse wave sensor 121 and a pressure sensor 122 are provided on the back surface of the housing 110. The position where the photoelectric pulse wave sensor 121 and the pressure sensor 122 are provided is, for example, when the housing 110 is gripped with one hand and the fingertip of the gripped hand is extended toward the photoelectric pulse wave sensor 121, the fingertip becomes the photoelectric pulse. It is a position where the photoelectric pulse wave sensor 121 is reached from diagonally below the wave sensor 121 and the pressure sensor 122. The photoelectric pulse wave sensor 121 and the pressure sensor 122 are provided, for example, on the back surface of the housing 110 at substantially the center in the width direction and on the upper side in the vertical direction. The photoelectric pulse wave sensor 121 detects the pulse wave of the fingertip in contact with the photoelectric pulse wave sensor 121. The pressure sensor 122 detects the pressure that the fingertip applies to the photoelectric pulse wave sensor 121.

FIG. 2 is a diagram showing an example of the hardware configuration of the smartphone used in the embodiment. The smartphone 100 includes a Central Processing Unit (CPU) 101, a main storage unit 102, an auxiliary storage unit 103, a communication unit 104, a speaker 111, a microphone for calling 112, a touch screen 113, a photoelectric pulse wave sensor 121, a pressure sensor 122, and a tilt sensor. Includes 123. The CPU 101, the main storage unit 102, the auxiliary storage unit 103, the communication unit 104, the speaker 111, the microphone for communication 112, the touch screen 113, the photoelectric pulse wave sensor 121, the pressure sensor 122 and the tilt sensor 123 are connected to each other by a connection bus. To.

The CPU 101 is also referred to as a microprocessor unit (MPU) or a processor. The CPU 101 is not limited to a single processor, and may have a multiprocessor configuration. Further, a single CPU 101 connected by a single socket may have a multi-core configuration. At least a part of the processing executed by the CPU 101 is the CPU 10
It may be performed by a processor other than 1, for example, a dedicated processor such as a Digital Signal Processor (DSP), a Graphics Processing Unit (GPU), a numerical calculation processor, a vector processor, or an image processing processor. Further, at least a part of the processing executed by the CPU 101 may be executed by an integrated circuit (IC) or another digital circuit. Further, an analog circuit may be included in at least a part of the CPU 101. Integrated circuits include Large Scale Integrated Circuits (LSIs), Application Specific Integrated Circuits (ASICs), and Programmable Logic Devices (PLDs). PLDs include, for example, Field-Programmable Gate Array (FPGA). The CPU 101 may be a combination of a processor and an integrated circuit. The combination is called, for example, a microcontroller unit (MCU), a system-on-a-chip (SoC), a system LSI, a chipset, or the like. In the smartphone 100, the CPU 101 expands the program stored in the auxiliary storage unit 103 into the work area of the main storage unit 102, and controls peripheral devices through the execution of the program. As a result, the smartphone 100 can execute a process that meets a predetermined purpose. The main storage unit 102 and the auxiliary storage unit 103 are recording media that can be read by the smartphone 100.

The main storage unit 102 is exemplified as a storage unit that is directly accessed from the CPU 101. The main storage unit 102 includes a Random Access Memory (RAM) and a Read Only Memory (ROM).

The auxiliary storage unit 103 stores various programs and various data in a literate recording medium. The auxiliary storage unit 103 is also called an external storage device. The auxiliary storage unit 103 stores an operating system (Operating System, OS), various programs, various tables, and the like. The OS includes a communication interface program that exchanges data with an external device or the like connected via the communication unit 104. The external device and the like include, for example, other information processing devices and external storage devices connected by a computer network or the like. The auxiliary storage unit 103 may be, for example, a part of a cloud system which is a group of computers on a network.

The auxiliary storage unit 103 is, for example, an Erasable Program ROM (EPROM), a solid state drive (Solid State Drive, SSD), a hard disk drive (Hard Disk Drive, HDD), or the like.

The communication unit 104 is, for example, an interface with a computer network that connects an information processing device so as to be communicable. The communication unit 104 communicates with an external device via a computer network.

The speaker 111 is a sound source that outputs sound. The speaker 111 outputs a sound such as a voice of the other party in a call using the smartphone 100. The telephone microphone 112 for telephone calls is a microphone mainly used for telephone calls. The call microphone 112 receives a sound input such as a user's voice in a call using the smartphone 100.

The touch screen 113 displays data processed by the CPU 101 and data stored in the main storage unit 102. As described above, the touch screen 113 includes a display and a touch panel. The display is, for example, Liquid Crystal Display (LCD), Plasma Display Panel (PDP), Elect.
It is a uloluminance (EL) panel and an organic EL panel. The touch panel is, for example, a capacitive touch panel.

The photoelectric pulse wave sensor 121 is a sensor that acquires a pulse wave from the fingertip. The photoelectric pulse wave sensor 121 receives the reflected light of the light radiated to the fingertip, and acquires the pulse wave based on the received reflected light. The light source that irradiates the fingertip with light may be integrated with the photoelectric pulse wave sensor 121 or may be a separate body. The light source is, for example, a Light Emitting Diode (LED). The photoelectric pulse wave sensor 121 is an example of the “first sensor”. Pulse waves are an example of "biological information".

The pressure sensor 122 is a sensor that detects the pressure applied to the detection surface. The pressure sensor 122 is provided so as to be superimposed on the photoelectric pulse wave sensor 121 with the detection surface facing the photoelectric pulse wave sensor 121. The tilt sensor 123 detects the tilt of the smartphone 100. The tilt sensor 123 detects, for example, the direction of the gravitational acceleration, and detects the tilt of the housing 110 based on the detected direction of the gravitational acceleration. The pressure sensor 122 is an example of a “second sensor”. The tilt sensor 123 is an example of a "third sensor".

<Osylometric method>
The smartphone 100 measures blood pressure by an oscillometric method. Here, the oscillometric method will be briefly described. For example, in the oscillometric method using a cuff, an air bag called a cuff is wrapped around a limb such as the upper arm. Air is sent to the cuff wrapped around the limbs to increase the pressure (also called cuff pressure). The blood pressure value is calculated using the phenomenon that the vibration component (oscillation) due to the pulsation of the artery is superimposed on the cuff pressure when the cuff pressure is pressurized to the systolic blood pressure or higher and then depressurized.

FIG. 3 is a diagram illustrating a measurement method for blood pressure measurement by the oscillometric method. FIG. 3 shows the relationship between the Korotkoff sounds and the oxidation waveform observed when the living body is gradually pressurized and the pressing force. The Korotkoff sound is a sound generated by turbulence generated in an artery in a portion where external pressure is applied when a living body is pressurized or depressurized. In the conventional auscultation method, the pressure when the Korotkoff sounds are generated is the diastolic blood pressure, and the pressure when the Korotkoff sounds disappear is the systolic blood pressure. The oxidation waveform is a waveform of vibration generated in a portion where external pressure is applied.

The oscillometric method has the characteristic that when the living body is pressurized or depressurized, the vibration component (oscillation) caused by the pulsation of the artery generated in the part where the external pressure is applied gradually increases, and after the maximum amplitude is taken, it decreases again. This is the blood pressure measurement method used. In the oscillometric method, the blood pressure value is calculated from the correlation between the magnitude of the amplitude of the oxidation waveform and the change in the pressing force instead of the Korotkoff sound. That is, the pressure at which the amplitude of the oxygenation waveform is maximum is the mean blood pressure. Several methods have been proposed for calculating the maximum blood pressure and the minimum blood pressure. As an example, the value obtained by multiplying the maximum point by a predetermined constant (for example, 0.5) is set as the threshold value of the maximum blood pressure, and the maximum point is set. There is a method in which a value multiplied by a predetermined constant (for example, 0.7) is set as the threshold of the diastolic blood pressure, and the cuff pressure corresponding to the intersection of the envelope of the pulse wave amplitude and each threshold is set as the respective blood pressure value.

Since the oscillometric method is such a measurement method, blood pressure cannot be measured correctly if the pressure applied to the living body is unstable. For example, the change in the pressing force applied to the living body is rapid, the change in the pressing force applied to the living body is excessively slow, there is a temporary decompression fluctuation in the process of gradually pressurizing, or the depressurizing is gradually performed. If there is a temporary pressure fluctuation in the process, an error may occur in the detection of the pressure pulse wave waveform, which may result in erroneous detection of the maximum amplitude of the oxygenation waveform, which may reduce the accuracy of blood pressure measurement. There is.

Therefore, in the following, a processing block and a processing flow for facilitating pressurization by a finger along a pressurization pattern will be described using the smartphone 100 having the above hardware configuration.

<Processing block of smartphone 100>
FIG. 4 is a diagram showing an example of a processing block of a smartphone used in the embodiment. The smartphone 100 includes a pressure detection unit 11, a tilt detection unit 12, a guide unit 13, and a measurement unit 14. In the smartphone 100, the CPU 101 executes a computer program executably deployed in the main storage unit 102, so that each part of the smartphone 100, such as the pressure detection unit 11, the tilt detection unit 12, the guide unit 13, and the measurement unit 14, is executed. Executes the process as.

The pressure detection unit 11 detects the pressure at which the fingertip pressurizes the photoelectric pulse wave sensor 121 based on the detection value of the pressure sensor 122. The tilt detection unit 12 detects the tilt of the housing 110 based on the detection value of the tilt sensor 123.

The guide unit 13 displays the tilt detected by the tilt sensor 123 on the touch screen 113. Further, the guide unit 13 outputs an index indicating the position of the finger to the touch screen 113. The index is displayed, for example, below the touch screen 113. FIG. 5 is a diagram illustrating a state in which an index is displayed in the embodiment. In FIG. 5, for reference, the positions of the photoelectric pulse wave sensor 121 and the pressure sensor 122 provided on the back surface of the housing 110 are illustrated by dotted lines. The guide unit 13 displays the index 212 below the touch screen 113. The guide unit 13 may further display a message prompting the touch to the index 212 on the touch screen 113. Further, the guide unit 13 may display an inclination gauge 213 that visually exemplifies the inclination of the housing 110. In the tilt gauge 213 illustrated in FIG. 5, a plurality of rectangles are arranged in a row, and the rectangle corresponding to the tilt of the housing 110 is displayed in a manner different from the other rectangles.

When the guide unit 13 detects a touch operation on the index 212, the guide unit 13 moves the index 212 upward to guide the movement of the finger touching the touch screen 113. That is, the guide unit 13 guides the movement of the finger touching the touch screen 113 by moving the index 212 so as to approach the photoelectric pulse wave sensor 121. The direction in which the index 212 is moved from the bottom to the top is an example of the “predetermined direction”.

FIG. 6 is a diagram schematically showing the guidance of the finger position by the guide unit in the embodiment. In FIG. 6, the positions of the photoelectric pulse wave sensor 121 and the index 212 are also schematically shown. When starting blood pressure measurement with the smartphone 100, the photoelectric pulse wave sensor 121 is pressed by the fingertip F1 from the back to the front in a state where the housing 110 is tilted by lifting the upper end from the lower end of the housing 110. .. Then, the fingertip F2 is touched at the position of the index 212. That is, the housing 110 is sandwiched between the fingertips F1 and the fingertips F2. The index 212 is an example of a “guidance image”.

The guide unit 13 moves the index 212 on the touch screen 113 so as to asymptotically approach the photoelectric pulse wave sensor 121. Along with this, the fingertip F2 moves while maintaining the touch on the touch screen 113. In FIG. 6, the moving direction of the index 212 and the fingertip F2 is exemplified by the arrow Y1, and the position of the fingertip F2 after the movement is exemplified by the dotted line.

Here, the mass of the smartphone 100 is m, the angle between the horizontal plane D1 and the housing 110 is θ, the distance from the lower end of the housing 110 to the photoelectric pulse wave sensor 121 is L1, and the distance from the lower end of the housing 110 to the center of gravity of the smartphone 100. The distance is L2, the distance from the lower end of the housing 110 to the fingertip F2 is L3, the force that the fingertip F1 pushes the photoelectric pulse wave sensor 121 is P1, and the fingertip F2 is the touch screen 1.
Assuming that the force pushing 13 is P2 and the gravitational acceleration is g, the following equation (1) holds.

According to the formula (1), P1 in which the fingertip F1 pushes the photoelectric pulse wave sensor 121 can be calculated by the following formula (2).

The distance L1 from the lower end of the housing 110 to the photoelectric pulse wave sensor 121 is a fixed value according to the design of the smartphone 100. Further, the distance L2 from the lower end of the housing 110 to the center of gravity is also a fixed value according to the design of the smartphone 100. Further, assuming that the inclination θ of the housing 110 is constant, “mg · cos θ” is a fixed value. From the equation (2), it can be understood that the greater the force P2 at which the fingertip F2 pushes the touch screen 113, the greater the force P1 applied to the photoelectric pulse wave sensor 121. Further, it can be understood that the larger the distance L3 from the lower end of the housing 110 to the fingertip F2, the larger the force P1 applied to the photoelectric pulse wave sensor 121.

That is, by moving the fingertip F2 according to the movement of the index 212, the pressure applied to the photoelectric pulse wave sensor 121 by the fingertip F1 can be gradually increased. In the smartphone 100, if P2 keeps the force of the fingertip F2 pressing the touch screen 113 constant, the fingertip F2 is moved according to the index 212 to easily control the pressurization of the photoelectric pulse wave sensor 121. Will be able to.

Then, the position of the index 212 with respect to the force P1 along the pressurizing pattern may be the position of L3 determined by the following equation (3) which is a modification of the equation (2).

Returning to FIG. 4, the measuring unit 14 starts blood pressure measurement when it detects a touch operation on the index 212 in a state where the inclination detected by the inclination detecting unit 12 is within the allowable range stored in the auxiliary storage unit 103. The measuring unit 14 acquires a pulse wave from the photoelectric pulse wave sensor 121 when the position of the index 212 and the pressure detected by the pressure detecting unit 11 satisfy the pressurizing pattern stored in the auxiliary storage unit 103 in advance. The pressurization pattern is, for example, information in which the position of the index 212 and the pressure detected by the pressure detection unit 11 are associated with each other. When the measuring unit 14 acquires a pulse wave sufficient for blood pressure measurement, the measuring unit 14 calculates the blood pressure based on the acquired pulse wave.

<Usage mode of smartphone 100>
FIG. 7 is a diagram illustrating a usage mode of the smartphone according to the embodiment. For example, the smartphone 100 is placed on the right hand so that the lower end thereof is in contact with the palm of the right hand and the fingertip F1 of the middle finger of the right hand is in contact with the photoelectric pulse wave sensor 121. Therefore, the lower end of the housing 110 is supported by the palm of the right hand, and the upper end side of the housing 110 is supported by the fingertip F1 in contact with the photoelectric pulse wave sensor 121. Therefore, the smartphone 100 is supported in a state where the housing 110 is tilted with respect to the palm of the right hand. The smartphone 100 supported in this way measures the blood pressure while guiding the fingertip F2 movement of the index finger of the left hand touching the index 212 by the index 212. In FIG. 7, the middle finger of the right hand is mentioned as the fingertip F1.
The index finger of the left hand is mentioned as the fingertip F2, but the fingertip F1 and the fingertip F2 are not limited thereto. The fingertip F1 and the fingertip F2 may be other fingers. Further, the hand on which the smartphone 100 is placed may be the left hand or the right hand. Further, the blood pressure measurement by the smartphone 100 may be performed using either the right hand or the left hand. For example, the smartphone 100 may be placed on the palm of the right hand, the tip of the middle finger of the right hand may touch the photoelectric pulse wave sensor 121, and the thumb of the right hand may touch the index 212.

<Processing flow of smartphone 100>
FIG. 8 is a diagram showing an example of a processing flow of a smartphone according to an embodiment. As illustrated in FIG. 7, the smartphone 100 starts blood pressure measurement with the lower end of the housing 110 in contact with the palm and the photoelectric pulse wave sensor 121 being supported by the fingertip F1. Hereinafter, an example of the processing flow of the smartphone 100 will be described with reference to FIG.

In T1, the guide unit 13 displays the inclination detected by the inclination detecting unit 12 on the touch screen 113. At T2, the guide unit 13 displays the index 212 on the touch screen 113. The index 212 is displayed, for example, at the center of the touch screen 113 in the width direction and below the touch screen 113.

At T3, the measuring unit 14 determines whether or not a touch operation with respect to the index 212 has been performed. If a touch operation is performed (YES at T3), the process proceeds to T4. If no touch operation is performed (NO at T3), the process of T3 is repeated.

At T4, the guide unit 13 calculates the position of the index 212 to be moved along the pressurization pattern. The guide unit 13 calculates the position of the index 212 using, for example, the equation (3). In T5, the guide unit 13 displays the index 212 at the position calculated in T4.

In T6, the measuring unit 14 acquires the pulse wave based on the detection value of the photoelectric pulse wave sensor 121, and also acquires the pressure from the pressure detecting unit 11. The measuring unit 14 stores the acquired pulse wave and the pressure in the auxiliary storage unit 103 in association with each other.

At T7, the measuring unit 14 determines whether or not the pressurizing pattern stored in the auxiliary storage unit 103 is completed. When the pressurization pattern is completed (YES at T7), the process proceeds to T8. If the pressurization pattern is not complete (NO at T7), processing proceeds to T4.

In T8, the measuring unit 14 calculates the blood pressure based on the pressure and the pulse wave acquired in T7. The measuring unit 14 extracts, for example, a pulse wave acquired when pressurization is performed along the pressurization pattern based on the pressure stored in the auxiliary storage unit 103. The measuring unit 14 may calculate the blood pressure based on the extracted pulse wave.

<Action and effect of the embodiment>
In the embodiment, the photoelectric pulse wave sensor 121 and the fingertip F1 come into contact with each other in a state where the housing 110 of the smartphone 100 is tilted. In such a state, the smartphone 100 displays on the touch screen 113 an index 212 that guides the position where the fingertip F2 is brought into contact. As described above, when the fingertip F2 is moved asymptotically to the photoelectric pulse wave sensor 121 on the touch screen 113, the pressure applied to the photoelectric pulse wave sensor 121 increases. The smartphone 100 moves the index 212 so that the pressurization along the pressurization pattern is performed on the photoelectric pulse wave sensor 121. Therefore, according to the present embodiment, by moving the fingertip F2 according to the index 212, it is possible to easily pressurize the photoelectric pulse wave sensor 121 along the pressurizing pattern.

In the embodiment, the guide unit 13 displays the tilt gauge 213 on the touch screen 113. The tilt gauge 213 displays the tilt of the housing 110 so that it can be visually understood. Therefore, the user of the smartphone 100 can easily keep the inclination of the housing 110 constant by checking the inclination gauge 213. That is, according to the embodiment, fluctuations in the inclination of the housing 110 during blood pressure measurement are suppressed.

<First modification>
In the embodiment, the index 212 has been moved to be displayed at a position where pressurization is performed along the pressurization pattern. In the first modification, a modification for correcting the position of the index 212 when the pressure applied to the photoelectric pulse wave sensor 121 deviates from the pressurization pattern will be described. The same components as those in the embodiment are designated by the same reference numerals, and the description thereof will be omitted. Hereinafter, the first modification will be described with reference to the drawings.

FIG. 9 is a diagram showing an example of a processing block of a smartphone according to the first modification. The smartphone 100a exemplified in FIG. 9 is different from the smartphone 100 according to the embodiment in that the guide unit 13a is provided in place of the guide unit 13.

In addition to the processing of the guide unit 13, the guide unit 13a further executes a correction process of correcting the position of the index 212 when the pressure acquired by the pressure detection unit 11 does not follow the pressurizing pattern. For example, when the acquired pressure is higher than the pressure specified by the pressurization pattern, the guide portion 13a is corrected to move the position of the index 212 downward to the position corresponding to the pressure specified by the pressurization pattern. Perform processing. Further, for example, when the detected pressure is lower than the pressure specified by the pressurization pattern, the guide unit 13a moves the index 212 upward to the position corresponding to the pressure specified by the pressurization pattern. I do.

FIG. 10 is a diagram showing an example of a processing flow of a smartphone according to the first modification. Hereinafter, an example of the processing flow of the smartphone 100a will be described with reference to FIG.

In J1, the guide unit 13a acquires the pressure from the pressure detection unit 11. In J2, the guide portion 13a determines whether or not the pressure acquired in J1 is a pressure along the pressurizing pattern. If the pressure gained in J1 follows the pressurization pattern (YES in J2), the process proceeds to J3. If the pressure gained in J1 does not follow the pressurization pattern (NO in J2), the process proceeds to J4.

In J3, the measuring unit 14 stores the pressure acquired by the guide unit 13a in J1 and the detected value of the photoelectric pulse wave sensor 121 in the auxiliary storage unit 103 in association with each other.

In J4, the guide unit 13a performs a correction process for correcting the position of the index 212. The guide unit 13a calculates the position of the index 212 according to the pressure acquired by J1.

In the first modification, the smartphone 100a corrects the position of the index 212 when the acquired pressure deviates from the pressurizing pattern. Therefore, the smartphone 100a can increase the possibility that the blood pressure measurement can be continued even when the acquired pressure deviates from the pressurization pattern.

The smartphone 100a may interrupt the blood pressure measurement when the deviation of the acquired pressure from the pressurization pattern is out of the permissible range.

<Other variants>
The speed at which the guide unit 13 moves the index 212 is not limited to a constant speed. The guide unit 13 may change the moving speed of the index 212 according to the pressure detected by the pressure detection unit 11. The guide portion 13 may reduce the upward movement speed of the index 212, for example, when the detected pressure is higher than the pressure along the pressurization pattern. Further, the guide unit 13 may increase the moving speed of the index in the upward direction when the detected pressure is lower than the pressure along the pressurizing pattern. By such processing, even if the pressure detected by the pressure detection unit 11 deviates from the pressurization pattern once, the smartphone 100 can pressurize along the pressurization pattern by changing the moving speed of the fingertip F2. Can be returned.

In the embodiment, the guide unit 13 has moved the index 212 displayed below the touch screen 113 upward. However, the moving direction of the index 212 is not limited from the lower side to the upper side. The guide unit 13 may move the index 212 displayed above the touch screen 113 downward. In such a case, the guide unit 13 may move the index 212 along a pressurizing pattern in which the pressure on the photoelectric pulse wave sensor 121 is gradually reduced.

In the embodiment, the guide unit 13 moves the index 212 along the vertical direction of the housing 110. However, the moving direction of the index 212 is not limited to the vertical direction. For example, the guide unit 13 may move the index 212 in the left-right direction of the housing 110. For example, when the smartphone 100 is placed on the palm with the fingers turned sideways, the index 212 may be moved in the width direction (left-right direction) of the housing 110. That is, when the smartphone 100 is supported with the upper end of the housing 110 lifted, the guide unit 13 may move the index 212 from the lower side to the upper side of the touch screen 113. Further, when the smartphone 100 is supported in a state where the left end portion of the housing 110 is lifted, the guide portion 13 may be moved from the right end portion of the touch screen 113 toward the left. .. Further, when the smartphone 100 is supported with the right end of the housing 110 lifted, the guide portion 13 may be moved from the left end of the touch screen 113 toward the right. .. In other words, the guide unit 13 determines the orientation of the smartphone 100 (housing 110) according to the tilt detected by the tilt sensor 123, and determines the moving direction of the index 212 according to the determined orientation of the housing 110. Just do it. Further, the guide unit 13 may determine the position of the index 212 so as to follow the pressurizing pattern even if the moving direction of the index 212 is a direction other than the vertical direction.

In the embodiment and the first modification, the photoelectric pulse wave sensor 121 is used for acquiring the pulse wave, but the sensor used for acquiring the pulse wave is not limited to the photoelectric pulse wave sensor 121. Examples of the sensor used for acquiring the pulse wave include a Doppler method and an optical fiber method. Such sensors include, for example, piezoelectric ceramics (PZT), Fiber. It can be manufactured by a technique such as Bragg Grating (FBG) or Micro Electro Electro Mechanical System (MEMS).

The embodiments and modifications disclosed above can be combined.

<< Computer-readable recording medium >>
An information processing program that realizes any of the above functions in a computer or other machine or device (hereinafter referred to as a computer or the like) can be recorded on a recording medium that can be read by a computer or the like. Then, by having a computer or the like read and execute the program of this recording medium, the function can be provided.

Here, a recording medium that can be read by a computer or the like is a recording medium that can store information such as data and programs by electrical, magnetic, optical, mechanical, or chemical action and can be read from a computer or the like. To say. Among such recording media, those that can be removed from a computer or the like include, for example, a flexible disk, a magneto-optical disk, and a Com.
perfect Disc Read Only Memory (CD-ROM), Compact Disc-Recodeable (CD-R), Compact Disc-ReWriterable (CD-RW), Digital Versatile Disc (DVD), Blu-ray Disc (DVD), Blu-ray Disc (BID) , 8 mm tape, memory cards such as flash memory, etc. Further, as a recording medium fixed to a computer or the like, there are a hard disk, a ROM, or the like.

100, 100a: Smartphone 110: Housing 101: CPU
102: Main storage unit 103: Auxiliary storage unit 104: Communication unit 111: Speaker 112: Call microphone 113: Touch screen 121: Photoelectric pulse wave sensor 122: Pressure sensor 123: Tilt sensor 11: Pressure detection unit 12: Tilt detection unit 13, 13a: Guide unit 14: Measurement unit 212: Index 213: Tilt gauge

Claims (7)

A first sensor, which is provided on the back of the plate-shaped housing and is pressurized by the first finger,
A second sensor that detects the pressure applied to the first sensor, and
A touch screen provided on the front surface of the housing and
A processing unit for measuring blood pressure based on biological information acquired from the first finger by the first sensor is provided.
The processing unit
A guide image that guides the position of the second finger that sandwiches the housing together with the first finger is displayed on the touch screen.
The guide image is moved in a predetermined direction, and the pressure detected by the second sensor is acquired.
Blood pressure is measured based on the biological information acquired from the first sensor when the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern.
Mobile terminal. When the pressure detected by the second sensor does not satisfy the predetermined pressure pattern, the processing unit moves the guide image to a position corresponding to the detected pressure.
The mobile terminal according to claim 1. The processing unit changes the speed at which the guide image is moved according to the relationship between the pressure detected by the second sensor and the pressure defined by the pressurization pattern.
The mobile terminal according to claim 1. Further equipped with a third sensor for detecting the inclination of the housing,
The processing unit causes the touch screen to display the inclination detected by the third sensor.
The mobile terminal according to any one of claims 1 to 3. The processing unit determines the orientation of the housing based on the inclination detected by the third sensor, and determines the predetermined direction according to the determined orientation.
The mobile terminal according to claim 4. A first sensor provided on the back surface of the plate-shaped housing and pressurized by the first finger, a second sensor for detecting the pressure applied to the first sensor, and the housing. A computer with a touch screen on the front of the
A guide image that guides the position of the second finger that sandwiches the housing together with the first finger is displayed on the touch screen.
The guide image is moved in a predetermined direction, and the pressure detected by the second sensor is acquired.
When the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern, the blood pressure is measured based on the biological information acquired from the first sensor.
Blood pressure measurement method. A first sensor provided on the back surface of the plate-shaped housing and pressurized by the first finger, a second sensor for detecting the pressure applied to the first sensor, and the housing. With a touch screen on the front of the computer,
A guide image that guides the position of the second finger that sandwiches the housing together with the first finger is displayed on the touch screen.
The guide image is moved in a predetermined direction, and the pressure detected by the second sensor is acquired.
When the relationship between the position of the guide image and the pressure detected by the second sensor satisfies a predetermined pressurization pattern, the blood pressure is measured based on the biological information acquired from the first sensor.
Blood pressure measurement program.

Images