Sphygmomanometer and blood pressure measurement method

Abstract

A sphygmomanometer (100) is provided with a blood pressure measurement unit (210) that automatically performs blood pressure measurement in accordance with a predetermined schedule in any one of a plurality of blood pressure measurement modes. The plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes having higher reliability than the normal measurement mode. The sphygmomanometer (100) is further provided with: a determination unit (220) that determines whether or not any one of a plurality of phenomena has occurred in the user when measuring the blood pressure; and a mode setting unit (225) that, on the basis of the determination result, sets an execution measurement mode from among the plurality of blood pressure measurement modes. The mode setting unit (225) sets the normal measurement mode as an execution measurement mode when any one of the phenomena does not occur, and sets any one of the plurality of measurement modes as an execution measurement mode when any one of the phenomena occurs.

Description

Technical Field

[0001] The present disclosure relates to a sphygmomanometer and a method for measuring blood pressure. Background Art

[0002] In the past, a sphygmomanometer with a nighttime (sleep) blood pressure measurement mode is known. For example, Patent Document 1 (Japanese Patent Publication No. 2021-69444) discloses the following technology: when the current blood pressure value measured in the nighttime blood pressure measurement mode may contain a measurement error, the time for re-measurement is appropriately set according to the phenomenon occurring in the subject.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-69444 Summary of the invention

[0006] Problems to be solved by the invention

[0007] When blood pressure measurement is performed over a long period of time (for example, a night while sleeping), the subject may experience various phenomena that may affect the blood pressure measurement, such as the occurrence of irregular pulse waves and body movements. When such phenomena occur, the blood pressure value may not be properly measured when measuring blood pressure. In addition, when an irregular pulse wave is detected during blood pressure measurement, it is ideal to determine whether the irregular pulse wave is an arrhythmia such as atrial fibrillation. Therefore, a technology is sought to improve the reliability of the measurement results (for example, the presence or absence of blood pressure values, arrhythmia, etc.) obtained when blood pressure measurement is automatically started while the subject is sleeping.

[0008] One aspect of the present disclosure aims to provide a sphygmomanometer and a blood pressure measurement method that can improve the reliability of measurement results when blood pressure measurement is automatically started.

[0009] Technical Solution

[0010] In one example of the present disclosure, a sphygmomanometer is provided for measuring blood pressure by compressing a measured part of a user by a cuff. The sphygmomanometer includes a blood pressure measuring unit that automatically performs blood pressure measurement in any one of a plurality of blood pressure measurement modes according to a predetermined schedule. The plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes whose reliability related to the measurement result is higher than that of the normal measurement mode. The sphygmomanometer also includes: a determination unit that determines whether any one of a plurality of predetermined phenomena has occurred to the user when the blood pressure measurement is performed by the blood pressure measurement unit; and a mode setting unit that sets an execution measurement mode to be performed by the blood pressure measurement unit from the plurality of blood pressure measurement modes based on the determination result of the determination unit. The mode setting unit sets the normal measurement mode as the execution measurement mode when any one of the plurality of phenomena has not occurred, and sets any one of the plurality of measurement modes as the execution measurement mode when any one of the plurality of phenomena has occurred.

[0011] According to the above configuration, the reliability of the measurement result can be improved during the automatically started blood pressure measurement.

[0012] In another example of the present disclosure, the plurality of measurement modes include a first measurement mode for performing blood pressure measurement more than a plurality of times in succession. The determination unit determines whether a user has arrhythmia based on a pulse wave signal obtained when the blood pressure measurement unit performs blood pressure measurement. The mode setting unit sets the normal measurement mode or the first measurement mode as the execution measurement mode based on whether arrhythmia occurs.

[0013] According to the above configuration, the highly reliable first measurement mode is set according to whether or not arrhythmia occurs.

[0014] In another example of the present disclosure, the mode setting unit sets the normal measurement mode as the execution measurement mode when arrhythmia has not occurred, and sets the first measurement mode as the execution measurement mode when arrhythmia has occurred.

[0015] According to the above configuration, the blood pressure measurement in the first measurement mode is performed on the user who has suffered arrhythmia, so that a highly reliable measurement result can be obtained.

[0016] In another example of the present disclosure, the mode setting unit sets the normal measurement mode as the execution measurement mode when arrhythmia has not occurred, and sets the first measurement mode as the execution measurement mode when arrhythmia has occurred and the number of times arrhythmia has occurred in the most recent specified number of blood pressure measurements is greater than a benchmark number.

[0017] According to the above configuration, since the blood pressure measurement in the first measurement mode is performed on the user who is prone to arrhythmia, a highly reliable measurement result can be obtained.

[0018] In another example of the present disclosure, the mode setting unit sets the normal measurement mode as the execution measurement mode when arrhythmia has not occurred, and sets the first measurement mode as the execution measurement mode when arrhythmia has occurred a predetermined number of times in succession.

[0019] According to the above configuration, since the blood pressure measurement in the first measurement mode is performed on the user who is prone to arrhythmia, a highly reliable measurement result can be obtained.

[0020] In another example of the present disclosure, when the first measurement mode is set, the blood pressure measurement unit determines whether a specified period has passed since the previous blood pressure measurement. If the specified period has not passed, the blood pressure measurement is performed according to the first measurement mode; if the specified period has passed, the blood pressure measurement is performed according to the normal measurement mode.

[0021] According to the above configuration, when the predetermined period has elapsed, the execution measurement mode can be automatically switched from the first measurement mode to the normal measurement mode.

[0022] In another example of the present disclosure, the plurality of measurement modes include a second measurement mode. In the normal measurement mode, the blood pressure measurement unit measures the user's blood pressure based on a pulse wave signal in a first pressurization process, wherein the first pressurization process pressurizes the cuff pressure representing the internal pressure of the cuff worn on the measured part of the user. The determination unit determines whether the user has an irregular pulse wave based on the pulse wave signal in the first pressurization process. The mode setting unit sets the normal measurement mode as the execution measurement mode when an irregular pulse wave does not occur, and sets the second measurement mode as the execution measurement mode when an irregular pulse wave occurs.

[0023] According to the above configuration, the blood pressure measurement in the second measurement mode is performed on the user having an irregular pulse wave, so that a highly reliable measurement result can be obtained.

[0024] In another example of the present disclosure, the blood pressure measuring unit measures the blood pressure of the user based on the pulse wave signal during the first pressurization process in the second measurement mode, and continues the first pressurization process until the first pulse wave number of the user obtained based on the pulse wave signal during the first pressurization process reaches or exceeds a threshold value. The determination unit determines whether the user has arrhythmia based on the pulse wave signal during the first pressurization process.

[0025] According to the above configuration, since the blood pressure measurement is performed in the second measurement mode, arrhythmia determination with high reliability can be performed by acquiring more pulse wave numbers.

[0026] In another example of the present disclosure, the plurality of measurement modes include a third measurement mode. In the normal measurement mode, the blood pressure measurement unit measures the user's blood pressure based on a pulse wave signal during a decompression process in which the cuff pressure is decompressed after a second pressurization process in which the cuff pressure is pressurized to a pressure greater than the estimated systolic blood pressure, wherein the cuff pressure represents the internal pressure of the cuff worn on the measured part of the user. The determination unit determines whether an irregular pulse wave has occurred in the user based on the pulse wave signal during the decompression process. The mode setting unit sets the normal measurement mode as the execution measurement mode when an irregular pulse wave has not occurred, and sets the third measurement mode as the execution measurement mode when an irregular pulse wave has occurred.

[0027] According to the above configuration, since the blood pressure measurement in the third measurement mode is performed on the user having an irregular pulse wave, a highly reliable measurement result can be obtained.

[0028] In another example of the present disclosure, the blood pressure measuring unit measures the blood pressure of the user based on the pulse wave signal in the decompression process after the second pressurization process in the third measurement mode, and continues the second pressurization process until the second pulse wave number of the user obtained based on the pulse wave signal in the second pressurization process reaches or exceeds a threshold value. The determination unit determines whether the user has arrhythmia based on the pulse wave signal in the decompression process.

[0029] According to the above configuration, since the blood pressure measurement is performed in the third measurement mode, arrhythmia determination with high reliability can be performed by acquiring more pulse wave numbers.

[0030] In another example of the present disclosure, the plurality of measurement modes include a fourth measurement mode for re-measuring blood pressure when the user's body movement occurs. The determination unit determines whether body movement occurs based on a pulse wave signal obtained when the blood pressure measurement unit performs blood pressure measurement. The mode setting unit sets the normal measurement mode or the fourth measurement mode as the execution measurement mode based on whether the body movement occurs.

[0031] According to the above configuration, the fourth measurement mode having high reliability is set according to the presence or absence of body movement.

[0032] In another example of the present disclosure, the mode setting unit sets the normal measurement mode as the execution measurement mode when no body movement occurs during the current blood pressure measurement, and sets the fourth measurement mode as the execution measurement mode when body movement occurs during the current blood pressure measurement and the cumulative number of blood pressure measurements is less than the first number.

[0033] According to the above configuration, since the blood pressure measurement in the fourth measurement mode is performed on the user who has performed body movements, a highly reliable measurement result can be obtained.

[0034] In another example of the present disclosure, there is provided a blood pressure measurement method performed by a sphygmomanometer that measures blood pressure by forcing a user's measured part with cuff pressure. The blood pressure measurement method includes the step of automatically performing blood pressure measurement in any one of a plurality of blood pressure measurement modes according to a predetermined schedule. The plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes whose reliability related to the measurement results is higher than that of the normal measurement mode. The blood pressure measurement method also includes the following steps: when performing blood pressure measurement, determining whether any one of a plurality of predetermined phenomena has occurred to the user; and based on the determination result obtained by the determination step, setting the execution measurement mode executed in the execution step from the plurality of blood pressure measurement modes. The setting step includes: when any one of the plurality of phenomena has not occurred, setting the normal measurement mode as the execution measurement mode, and when any one of the plurality of phenomena has occurred, setting any one of the plurality of measurement modes as the execution measurement mode.

[0035] According to the above configuration, the reliability of the measurement result can be improved during the automatically started blood pressure measurement.

[0036] Effects of the Invention

[0037] According to the present disclosure, the reliability of the measurement result can be improved when the blood pressure measurement is automatically started. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a diagram for explaining an application example of a sphygmomanometer.

[0039] Figure 2 This is a diagram showing the appearance of a sphygmomanometer.

[0040] Figure 3 This is a block diagram showing the hardware configuration of a blood pressure monitor.

[0041] Figure 4 This is a block diagram showing the functional configuration of a sphygmomanometer.

[0042] Figure 5 This is a flowchart showing an example of a process procedure for setting a measurement mode according to whether or not arrhythmia occurs.

[0043] Figure 6 This is a flowchart showing an example of a blood pressure measurement process in the normal mode of the sphygmomanometer.

[0044] Figure 7 This is a flowchart showing another example of the blood pressure measurement process in the normal mode of the sphygmomanometer.

[0045] Figure 8 This is a flowchart showing an example of a blood pressure measurement process in the first measurement mode of the blood pressure monitor.

[0046] Fig. 9 This is a flowchart showing another example of the blood pressure measurement process in the first measurement mode of the blood pressure monitor.

[0047] Fig.10 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of arrhythmia.

[0048] Fig.11 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of arrhythmia.

[0049] Fig.12 This is a flowchart showing an example of a process procedure for setting a measurement mode according to whether or not an irregular pulse wave occurs.

[0050] Fig.13 This is a flowchart showing an example of a blood pressure measurement process in the second measurement mode of the blood pressure monitor.

[0051] Fig.14 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of an irregular pulse wave.

[0052] Fig.15 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of the irregular pulse wave.

[0053] Fig.16 This is a flowchart showing an example of a blood pressure measurement process in the third measurement mode of the blood pressure monitor.

[0054] Fig.17 This is a flowchart showing an example of a process of setting a measurement mode according to the presence or absence of body movement. DETAILED DESCRIPTION

[0055] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components. Their names and functions are also the same. Therefore, they will not be described in detail again.

[0056] [Application Examples]

[0057] Reference Figure 1 , an application example of the present invention is described. Figure 1 This is a diagram for explaining an application example of the sphygmomanometer 100 .

[0058] Reference Figure 1The sphygmomanometer 100 is a wrist sphygmomanometer that measures blood pressure by compressing the measured part of the user (i.e., the subject) with a cuff. When measuring blood pressure, the sphygmomanometer 100 is worn with the cuff wrapped around the user's wrist. The sphygmomanometer 100 has a main body and a cuff (armband) as main components. It should be noted that the sphygmomanometer 100 can also be an upper arm sphygmomanometer in which the main body and the cuff (armband) are integrated. Figure 1 Describe the processing content.

[0059] exist Figure 1 In the embodiment, it is assumed that the blood pressure meter 100 automatically measures the blood pressure of the user while the user is sleeping. The blood pressure meter 100 automatically starts the blood pressure measurement according to a predetermined schedule (corresponding to Figure 1 (1)).

[0060] The sphygmomanometer 100 performs blood pressure measurement of the user by the oscillometric method in a normal measurement mode (hereinafter also referred to as “normal mode”). Figure 1 (2)). The sphygmomanometer 100 determines whether arrhythmia such as atrial fibrillation, which is one of the phenomena that may affect blood pressure measurement, has occurred based on the pulse wave signal obtained when measuring blood pressure. Here, it is assumed that arrhythmia (corresponding to Figure 1 (3)).

[0061] Next, when arrhythmia occurs, the sphygmomanometer 100 switches the measurement mode executed when measuring blood pressure (hereinafter also referred to as "execution measurement mode") from the normal mode to the continuous measurement mode (corresponding to Figure 1 (4)). The continuous measurement mode is a measurement mode in which a series of processes from the start to the end of the blood pressure measurement performed in the normal mode are repeated multiple times (for example, three times). Therefore, the blood pressure value obtained by the blood pressure measurement in the continuous measurement mode (for example, the average blood pressure value of three times) becomes a more reliable value than the blood pressure value obtained by the blood pressure measurement in the normal mode. That is, it can be said that the continuous measurement mode is a measurement mode in which the reliability related to the measurement result (in this case, the blood pressure value) is higher than that of the normal mode (a more appropriate blood pressure value can be obtained). It should be noted that when no arrhythmia occurs, the measurement mode is executed to maintain the normal mode.

[0062] Then, at the next blood pressure measurement, the sphygmomanometer 100 performs the blood pressure measurement using the continuous measurement mode (corresponding to Figure 1 (5)).

[0063] According to the above application example, when arrhythmia occurs during blood pressure measurement in the normal mode (corresponding to Figure 1 (3)), the blood pressure value obtained by the blood pressure measurement may be unreliable. Figure 1In (4), the measurement mode is switched from the normal mode to the continuous measurement mode with high reliability. Figure 1 As shown in (5), the sphygmomanometer 100 performs blood pressure measurement using the continuous measurement mode.

[0064] Thus, for a user who has detected arrhythmia during sleep, the next blood pressure measurement is performed using a more reliable measurement mode. Therefore, even for a user who has detected arrhythmia, a highly reliable measurement result can be obtained.

[0065] On the other hand, for users who have not detected arrhythmia during sleep, a highly reliable measurement result can be obtained even in the normal mode, so the normal mode is also used for the next blood pressure measurement. In this case, it is possible to avoid the situation where the measurement takes a long time and is complicated for the user.

[0066] As described above, according to the sphygmomanometer 100 of this embodiment, the reliability of the measurement result can be improved during the automatically started blood pressure measurement.

[0067] [Configuration example]

[0068] <Appearance>

[0069] Figure 2 1 is a diagram showing the appearance of the sphygmomanometer 100. The sphygmomanometer 100 includes a cuff 20 for blood pressure measurement to be worn on a wrist as a measurement site, and a main body 10 integrally mounted on the cuff 20.

[0070] The cuff 20 has an elongated band shape so as to be wrapped around the wrist in the circumferential direction. A fluid bag for compressing the wrist is contained in the cuff 20. It should be noted that, in order to always maintain the cuff 20 in an annular shape, a collar with appropriate flexibility may also be provided in the cuff 20.

[0071] The main body 10 is integrally mounted on a substantially central portion of the long dimension direction of the band-shaped cuff 20. The main body 10 has a flat substantially rectangular parallelepiped shape along the outer peripheral surface of the cuff 20. The main body 10 is formed to be small and thin so as not to disturb the user's sleep. In addition, the corners of the main body 10 are rounded.

[0072] A display 50 constituting a display screen and an operation unit 52 for inputting instructions from a user are provided on a surface (top surface) on the side farthest from the wrist among the outer surfaces of the main body 10 .

[0073] The display 50 is composed of, for example, an LCD (Liquid Crystal Display), and displays various information in accordance with a control signal from a processor. Figure 2In the example, the maximum blood pressure (unit: mmHg), the minimum blood pressure (unit: mmHg), and the pulse rate (unit: beats / minute) are displayed. It should be noted that the display 50 can be composed of an organic EL (ElectroLuminescence) display, and can also include an LED (Light Emitting Diode).

[0074] The operation unit 52 inputs an operation signal corresponding to an instruction from the user to the processor. The operation unit 52 includes a measurement switch 52A for accepting a blood pressure measurement instruction (eg, a manual measurement instruction) from the user and an automatic measurement switch 52B for accepting an automatic measurement instruction.

[0075] Here, "manual measurement" refers to a measurement method in which, when a blood pressure measurement instruction is input through the measurement switch 52A, blood pressure measurement is performed according to the blood pressure measurement instruction. "Automatic measurement" refers to a measurement method in which blood pressure measurement is automatically started according to a predetermined schedule so that the user can measure the blood pressure value during sleep. The predetermined schedule refers to, for example, a plan to perform measurement at a specified time such as 1:00 a.m., 2:00 a.m., or 3:00 a.m., a plan to perform measurement once every 2 hours after pressing the automatic measurement switch 52B, etc. Therefore, not limited to at night or during sleep, when the user wants to perform a blood pressure measurement that starts automatically, the user only needs to press the automatic measurement switch 52B.

[0076] When the measurement switch 52A is pressed, the cuff 20 temporarily compresses the measurement site, and the blood pressure measurement is performed by the oscillometric method. When the measurement switch 52A is pressed again during the blood pressure measurement (for example, during the cuff 20 is pressurized), the blood pressure measurement is stopped.

[0077] When the automatic measurement switch 52B is pressed, the oscillometric blood pressure measurement automatically starts according to a predetermined schedule. When the automatic measurement switch 52B is pressed again during the automatic measurement by the sphygmomanometer 100, the sphygmomanometer 100 stops the automatic measurement.

[0078] <Hardware Configuration>

[0079] Figure 3 is a block diagram showing the hardware configuration of the sphygmomanometer 100. Figure 3 The sphygmomanometer 100 includes a main body 10 and a cuff 20 as main components. The cuff 20 contains a fluid bag 22. The main body 10 includes a processor 110, an air system component 30 for measuring blood pressure, an acceleration sensor 34, A / D conversion circuits 310 and 340, a pump drive circuit 320, a valve drive circuit 330, a display 50, a memory 51, an operation unit 52, a communication interface 53, and a power supply unit 54.

[0080] The processor 110 is a calculation processing unit such as a CPU (Central Processing Unit) or an MPU (MultiProcessing Unit). The processor 110 implements each process (step) of the sphygmomanometer 100 described later by reading and executing a program stored in the memory 51. For example, the processor 110 controls the driving pump 32 and the valve 33 according to an operation signal from the operation unit 52. In addition, the processor 110 calculates the blood pressure value using an algorithm for calculating the blood pressure based on the oscillometric method, and displays it on the display 50.

[0081] The memory 51 is implemented by a RAM (Random Access Memory), a ROM (Read-Only Memory), a flash memory, etc. The memory 51 stores a program for controlling the sphygmomanometer 100, data for controlling the sphygmomanometer 100, setting data for setting various functions of the sphygmomanometer 100, and data of measured blood pressure values, pulse wave numbers, pulse wave intervals, etc. The memory 51 is used as a working memory when executing a program, etc.

[0082] The air system assembly 30 supplies or discharges air to the fluid bag 22 contained in the cuff 20 through the air piping. The air system assembly 30 includes a pressure sensor 31 for detecting the pressure in the fluid bag 22, and a pump 32 and a valve 33 as an expansion and contraction mechanism for expanding and contracting the fluid bag 22.

[0083] The pressure sensor 31 detects the pressure (cuff pressure) in the fluid bag 22, and outputs a signal (cuff pressure signal) corresponding to the detected pressure to the A / D conversion circuit 310. The pressure sensor 31 is, for example, a piezoresistive pressure sensor, and is connected to the pump 32, the valve 33, and the fluid bag 22 contained in the cuff 20 via an air pipe. The pump 32 supplies air as a fluid to the fluid bag 22 via the air pipe to pressurize the cuff. The valve 33 opens and closes by discharging the air in the fluid bag 22 or sealing the air into the fluid bag 22 via the air pipe to control the cuff pressure.

[0084] The A / D conversion circuit 310 converts the output value of the pressure sensor 31 (for example, a voltage value corresponding to the change in resistance caused by the piezoresistive effect) from an analog signal into a digital signal and outputs it to the processor 110. The processor 110 obtains a signal indicating the cuff pressure based on the output value of the A / D conversion circuit 310. The pump drive circuit 320 controls the drive of the pump 32 based on the control signal given by the processor 110. The valve drive circuit 330 controls the opening and closing of the valve 33 based on the control signal given by the processor 110.

[0085] The processor 110 performs blood pressure measurement by using a pressurization measurement method to measure the user's blood pressure based on a pulse wave signal during a pressurization process of pressurizing the cuff pressure, or by using a decompression measurement method to measure the user's blood pressure based on a pulse wave signal during a decompression process of decompressing the cuff pressure after pressurizing the cuff pressure to a pressure greater than the estimated systolic blood pressure.

[0086] For example, when measuring by decompression measurement, the following actions are roughly performed. The cuff is wrapped around the user's measured part (wrist, arm, etc.) in advance. During the measurement, the pump 32 and valve 33 are controlled to increase the cuff pressure to a level higher than the estimated systolic blood pressure, and then the pressure is slowly reduced. During the decompression process, the cuff pressure is detected by the pressure sensor 31, and the change in arterial volume generated in the artery of the measured part is extracted as a pulse wave signal. Based on the change in the amplitude of the pulse wave signal accompanying the change in the cuff pressure at this time (mainly the rising edge and the falling edge), the highest blood pressure (systolic blood pressure) and the lowest blood pressure (diastolic blood pressure) are calculated.

[0087] The A / D conversion circuit 340 converts the output of the acceleration sensor 34 from an analog signal to a digital signal and outputs the digital signal to the processor 110. For example, the acceleration sensor 34 is used to detect the body movement of the user.

[0088] The display 50 displays various information including blood pressure measurement results based on a control signal from the processor 110. The communication interface 53 exchanges various information with an external device. The power supply unit 54 supplies power to the processor 110 and various hardware.

[0089] The operation unit 52 inputs an operation signal corresponding to an instruction from the user to the processor 110. Figure 2 As described in , the operation unit 52 includes a measurement switch 52A and an automatic measurement switch 52B.

[0090] <Functional Configuration>

[0091] Figure 4 is a block diagram showing the functional configuration of the sphygmomanometer 100. Figure 4 The sphygmomanometer 100 includes a blood pressure measuring unit 210, a pulse wave number measuring unit 215, a determination unit 220, a mode setting unit 225, and an output control unit 230 as main functional components. These functions are realized, for example, by the processor 110 of the sphygmomanometer 100 executing a program stored in the memory 51. Some or all of these functions may also be realized by hardware.

[0092] The blood pressure measuring unit 210 controls the cuff pressure indicating the internal pressure of the cuff 20 according to a measurement start instruction (e.g., a manual measurement instruction) from the user via the operation unit 52. Specifically, the blood pressure measuring unit 210 controls driving the pump 32 via the pump driving circuit 320 and driving the valve 33 via the valve driving circuit 330. The valve 33 opens and closes to discharge or seal air in the fluid bag 22, thereby controlling the cuff pressure.

[0093] The blood pressure measuring unit 210 receives the cuff pressure signal detected by the pressure sensor 31, and extracts a pulse wave signal representing the pulse wave of the measured part superimposed on the cuff pressure signal. That is, the blood pressure measuring unit 210 detects the pulse wave as a pressure component superimposed on the cuff pressure signal in synchronization with the heart beat of the user from the cuff pressure signal.

[0094] The blood pressure measurement unit 210 calculates the blood pressure information of the user based on the cuff pressure signal and the pulse wave signal superimposed on the cuff pressure signal. The blood pressure measurement unit 210 measures the blood pressure of the user according to the oscillometric method.

[0095] On the other hand, the blood pressure measurement unit 210 automatically performs blood pressure measurement according to a predetermined schedule in response to the pressing of the automatic measurement switch 52B. In the automatic measurement, the blood pressure measurement unit 210 performs blood pressure measurement in any one of a plurality of blood pressure measurement modes. The plurality of blood pressure measurement modes include a normal mode and a plurality of measurement modes M1 to M4 whose reliability of measurement results is higher than that of the normal mode. The measurement results include a blood pressure value and a determination result of the presence or absence of arrhythmia.

[0096] The measurement mode M1 is a mode in which blood pressure measurement is repeated a plurality of times (for example, three times) in succession, and corresponds to the above-mentioned continuous measurement mode.

[0097] The measurement mode M2 ​​is a mode for performing blood pressure measurement by a pressurization measurement method, and is a mode in which the pressurization process in the pressurization measurement method is continued until a pulse wave number greater than the threshold value Th1 is obtained. When the blood pressure measurement unit 210 performs the measurement mode M2, the blood pressure of the user is measured based on the pulse wave signal in the first pressurization process of pressurizing the cuff pressure, and the first pressurization process is continued until the pulse wave number N1 of the user obtained based on the pulse wave signal in the first pressurization process reaches greater than the threshold value Th1. Therefore, in the measurement mode M2, a larger pulse wave number can be obtained when measuring blood pressure than in the normal mode, so that a highly reliable arrhythmia determination result can be obtained.

[0098] The measurement mode M3 is a mode for performing blood pressure measurement by the decompression measurement mode, and is a mode for continuing the pressurization process in the decompression measurement mode until the pulse wave number is greater than the threshold value Th2. When the blood pressure measurement unit 210 performs the measurement mode M3, the blood pressure of the user is measured based on the pulse wave signal in the decompression process in which the cuff pressure is decompressed after the second pressurization process in which the cuff pressure is pressurized to a pressure greater than the estimated systolic blood pressure, and the second pressurization process is continued until the pulse wave number N2 of the user obtained based on the pulse wave signal in the second pressurization process reaches greater than the threshold value Th2. Therefore, in the measurement mode M3, a larger pulse wave number can be obtained when measuring blood pressure, and thus a highly reliable arrhythmia determination result can be obtained.

[0099] The measurement mode M4 is a mode for re-measuring the blood pressure when the user's body movement occurs during the blood pressure measurement. Detailed processing performed in the five measurement modes (ie, the normal mode and the measurement modes M1 to M4) will be described later.

[0100] The pulse wave number measuring unit 215 measures the user's pulse wave number N1 based on the pulse wave signal during the first pressurization process when the blood pressure measurement unit 210 performs the blood pressure measurement using the pressurization measurement method. In addition, the pulse wave number measuring unit 215 measures the user's pulse wave number N2 based on the pulse wave signal during the second pressurization process when the blood pressure measurement using the decompression measurement method is performed.

[0101] The determination unit 220 determines whether the user has experienced any one of a plurality of predetermined phenomena when the blood pressure measurement unit 210 performs automatic blood pressure measurement. The plurality of phenomena include irregular pulse waves, arrhythmias, and body movements.

[0102] In one aspect, the determination unit 220 determines whether the user has an irregular pulse wave based on the pulse wave signal obtained when the blood pressure measurement unit 210 performs blood pressure measurement. A known method is used for determining an irregular pulse wave. For example, the determination unit 220 determines that an irregular pulse wave has occurred when there is a pulse wave that deviates by more than ±25% from the average value of the pulse wave intervals obtained when the blood pressure measurement is performed.

[0103] On the other hand, the determination unit 220 determines whether the user has arrhythmia (a type of irregular pulse wave) based on the pulse wave signal obtained when the blood pressure measurement unit 210 performs blood pressure measurement. A known method is used for determining arrhythmia. For example, the determination unit 220 determines whether arrhythmia has occurred based on the regularity of the pulse wave interval. Therefore, in order to perform the arrhythmia determination with high accuracy, a sufficient number of pulse wave intervals are required.

[0104] In another aspect, the determination unit 220 determines whether body movement is detected based on the pulse wave signal obtained when measuring blood pressure. For example, the determination unit 220 determines that body movement has occurred when the difference between the size (amplitude) of a certain pulse wave and the size of the pulse wave before and after it is greater than a specified value. Alternatively, the determination unit 220 determines that body movement has occurred when the cuff pressure changes by more than a specified pressure within a specified time (for example, within 1 second).

[0105] Typically, when the blood pressure measurement using the pressurization measurement method is performed by the blood pressure measurement unit 210, the determination unit 220 determines whether an irregular pulse wave, arrhythmia, or body movement occurs based on the pulse wave signal during the pressurization process of the pressurization measurement method. When the blood pressure measurement using the decompression measurement method is performed by the blood pressure measurement unit 210, the determination unit 220 determines whether an irregular pulse wave, arrhythmia, or body movement occurs based on the pulse wave signal during the decompression process of the decompression measurement method.

[0106] It should be noted that the determination unit 220 may also determine whether the user's body movement has occurred based on the change in the output value obtained from the acceleration sensor 34. The determination unit 220 calculates the average value of the output of the acceleration sensor 34 for each unit period (for example, 1 second or several seconds), and then calculates the change in the acceleration output at each moment in the unit period relative to the change in the average value. Then, the determination unit 220 determines that body movement has occurred when the square root of the sum of the squares of the changes exceeds a predetermined threshold.

[0107] The mode setting unit 225 sets the execution measurement mode to be executed by the blood pressure measurement unit 210 from among the plurality of blood pressure measurement modes based on the determination result of the determination unit 220. Specifically, when any of the plurality of phenomena (e.g., irregular pulse wave, arrhythmia, body movement) does not occur, the mode setting unit 225 sets the normal mode as the execution measurement mode. When any of the phenomena occurs, the mode setting unit 225 sets any of the first to fourth measurement modes as the execution measurement mode. Hereinafter, the first to fourth measurement modes are also referred to as measurement modes M1 to M4, respectively.

[0108] First, a configuration for setting the measurement mode based on whether or not arrhythmia occurs will be described. In this case, the mode setting unit 225 sets the normal mode or the measurement mode M1 as the execution measurement mode based on whether or not the user has arrhythmia.

[0109] Specifically, the mode setting unit 225 sets the normal mode as the execution measurement mode when arrhythmia does not occur, and sets the measurement mode M1 as the execution measurement mode when arrhythmia occurs. In another example, the mode setting unit 225 may set the measurement mode M1 as the execution measurement mode when arrhythmia occurs in the most recent predetermined number of blood pressure measurements (e.g., five times) including the current blood pressure measurement, when the number of arrhythmia occurrences is greater than a reference number (e.g., three times) when arrhythmia occurs.

[0110] In another example, the mode setting unit 225 may set the measurement mode M1 as the execution measurement mode when arrhythmia occurs in the current blood pressure measurement and arrhythmia also occurs in the most recent predetermined number of blood pressure measurements (e.g., two times) including the current blood pressure measurement. That is, the mode setting unit 225 may set the measurement mode M1 as the execution measurement mode when arrhythmia occurs a predetermined number of times in succession.

[0111] Next, a configuration for setting the measurement mode based on the presence or absence of an irregular pulse wave will be described. In this case, the mode setting unit 225 sets the normal mode or any one of the measurement modes M1 to M3 as the execution measurement mode based on the presence or absence of an irregular pulse wave in the user.

[0112] Specifically, the mode setting unit 225 sets the normal mode as the execution measurement mode when an irregular pulse wave does not occur, and sets any one of the measurement modes M1 to M3 as the execution measurement mode when an irregular pulse wave occurs. For example, any one of the measurement modes M1 to M3 is selected according to the modes X1 to X3 set in the sphygmomanometer 100. When the mode X1 is set, the mode setting unit 225 selects (sets) the measurement mode M1 when an irregular pulse wave occurs. Similarly, the mode setting unit 225 selects the measurement mode M2 ​​when the mode X2 is set, and selects the measurement mode M3 when the mode X3 is set.

[0113] As described above, when any one of the measurement modes M1 to M3 is set by the mode setting unit 225, the blood pressure measurement unit 210 determines whether a predetermined period has passed since the last blood pressure measurement. If the predetermined period has not passed, the blood pressure measurement unit 210 performs blood pressure measurement in accordance with the measurement mode set in the measurement modes M1 to M3. If the predetermined period has passed, the mode setting unit 225 switches the measurement mode to the normal mode. Therefore, the blood pressure measurement unit 210 performs blood pressure measurement in the normal mode.

[0114] It should be noted that, when the blood pressure measurement unit 210 performs blood pressure measurement in the measurement mode M2, the determination unit 220 further determines whether the user has arrhythmia based on the pulse wave signal during the first pressurization process during the blood pressure measurement. In addition, when the blood pressure measurement unit 210 performs blood pressure measurement in the measurement mode M3, the determination unit 220 further determines whether the user has arrhythmia based on the pulse wave signal during the decompression process during the blood pressure measurement.

[0115] Next, a configuration for setting the measurement mode based on whether or not the user has body motion will be described. In this case, the mode setting unit 225 sets the normal mode or the measurement mode M4 as the execution measurement mode based on whether or not the user has body motion.

[0116] Specifically, the mode setting unit 225 sets the normal mode as the execution measurement mode when no body movement occurs during the current blood pressure measurement, and sets the measurement mode M4 as the execution measurement mode when body movement occurs during the current blood pressure measurement and the cumulative number of blood pressure measurements is less than J times (for example, three times). When the measurement mode M4 is set, the blood pressure measurement unit 210 performs a remeasurement of the blood pressure. The cumulative number of measurements is the cumulative number of blood pressure measurements performed since the blood pressure measurement unit 210 started automatic measurement.

[0117] The output control unit 230 displays the measurement results (e.g., systolic blood pressure value and diastolic blood pressure value) of the blood pressure measurement unit 210 and the determination results (e.g., the determination results of whether arrhythmia, irregular pulse wave, and body movement occur) of the determination unit 220 on the display 50. It should be noted that the output control unit 230 may send the measurement results and the determination results to an external device via the communication interface 53, or may be a structure for performing sound output via a speaker (not shown).

[0118] <Processing>

[0119] (Mode setting process according to the presence or absence of arrhythmia: Part 1)

[0120] Figure 5 FIG. 1 is a flowchart showing an example of a process for setting a measurement mode according to whether or not arrhythmia occurs. Figure 5 At the start time of the process shown, the user is wearing the cuff 20 of the blood pressure monitor 100. Figure 5 In the example, the normal mode or the measurement mode M1 is set as the measurement mode to be executed. Fig.10 , Fig.11 The same is true in .

[0121] Reference Figure 5, the processor 110 determines whether the start instruction of the automatic measurement is accepted (i.e., whether the selection of the automatic measurement switch 52B is accepted) (step S10). If the start instruction is not accepted (NO in step S10), the processor 110 repeats step S10. If the start instruction is accepted (YES in step S10), the processor 110 determines whether the currently set execution measurement mode is the normal mode (step S12).

[0122] When the measurement mode to be performed is the normal mode (Yes in step S12), the processor 110 performs blood pressure measurement in the normal mode (step S20). The blood pressure measurement process in the normal mode will be described later.

[0123] When the execution measurement mode is not the normal mode (i.e., the execution measurement mode is the measurement mode M1) (No in step S12), the processor 110 determines whether a specified period (e.g., a specified number of days such as 1 day or 2 days) has passed since the previous blood pressure measurement (step S14). When the specified period has passed (Yes in step S14), the processor 110 switches the execution measurement mode to the normal mode (step S16), and performs blood pressure measurement in the normal mode (step S20). When the specified period has not passed (No in step S14), the processor 110 performs blood pressure measurement in the measurement mode M1 (step S18). The blood pressure measurement process according to the measurement mode M1 will be described later.

[0124] Next, the processor 110 determines whether arrhythmia has occurred based on the pulse wave signal obtained when measuring blood pressure in step S18 or S20 (step S22). If arrhythmia has occurred (yes in step S22), the processor 110 sets the measurement mode M1 as the execution measurement mode (step S24). If arrhythmia has not occurred (no in step S22), the processor 110 sets the normal mode as the execution measurement mode (step S26).

[0125] Here, Figure 5 The blood pressure measurement process in the normal mode of step S20 will be described.

[0126] Figure 6 This is a flowchart showing an example of the blood pressure measurement process in the normal mode of the sphygmomanometer 100 . Figure 6 The process shown is a process for measuring blood pressure by pressure measurement.

[0127] Reference Figure 6The processor 110 of the sphygmomanometer 100 initializes the pressure sensor 31 (step S102). Specifically, the processor 110 initializes the processing storage area, and performs 0 mmHg adjustment of the pressure sensor 31 (setting the atmospheric pressure to 0 mmHg) while the pump 32 is turned off (stopped) and the valve 33 is opened.

[0128] Next, the processor 110 closes the valve 33 via the valve drive circuit 330 (step S104), turns on (starts) the pump 32 via the pump drive circuit 320, and starts pressurizing the cuff 20 (fluid bag 22) (step S106). At this time, the processor 110 controls the pressurization speed of the cuff pressure, which is the pressure in the fluid bag 22, based on the output of the pressure sensor 31 while supplying air from the pump 32 to the fluid bag 22 through the air pipe.

[0129] Next, the processor 110 extracts the pulse wave signal from the cuff pressure signal detected by the pressure sensor 31, attempts to calculate the highest blood pressure (systolic blood pressure) and the lowest blood pressure (diastolic blood pressure) based on the pulse wave signal, and determines whether the blood pressure calculation is completed (step S108).

[0130] When the blood pressure calculation is not completed due to insufficient data (No in step S108), the processor 110 repeats the processing of steps S106 and S108 as long as the cuff pressure does not reach the predetermined upper limit pressure (for example, 300 mmHg). When the blood pressure calculation is completed (Yes in step S108), the processor 110 stops the pump 32 (step S110), opens the valve 33 (step S112), and controls the air in the cuff 20 to be exhausted. The processor 110 displays the blood pressure value measured by the blood pressure measurement on the display 50 (step S114).

[0131] Figure 7 2 is a flowchart showing another example of the blood pressure measurement process in the normal mode of the sphygmomanometer 100 . Figure 7 The process shown is a process of measuring blood pressure by a reduced pressure measurement method.

[0132] Reference Figure 7 The processing of steps S122 to S126 is respectively the same as Figure 6 The processing of steps S102 to S106 is the same, so the detailed description thereof will not be given again.

[0133] Processor 110 estimates systolic blood pressure based on the pulse wave signal obtained during pressurization (step S128). Processor 110 determines whether the cuff pressure has reached or exceeded pressure P1 (step S130). Typically, pressure P1 is set to a fixed value (e.g., 40 mmHg) higher than the estimated systolic blood pressure value.

[0134] When the cuff pressure is less than the pressure P1 (No in step S130), the processor 110 returns to step S126. When the cuff pressure is greater than the pressure P1 (Yes in step S130), the processor 110 controls to stop the pump 32 (step S132) and gradually open the valve 33 (step S134). Thus, the process changes from the pressurization process to the decompression process, and the cuff pressure is gradually reduced.

[0135] During the decompression process, the processor 110 extracts the pulse wave signal from the cuff pressure signal detected by the pressure sensor 31, attempts to calculate the systolic blood pressure and the diastolic blood pressure based on the pulse wave signal, and determines whether the blood pressure calculation is completed (step S136). If the blood pressure calculation is not completed (no in step S136), the processor 110 repeatedly performs the processing of steps S134 and S136. If the blood pressure calculation is completed (yes in step S136), the processor 110 controls so that the valve 33 is fully opened (step S138) to rapidly discharge the air in the cuff 20. The processor 110 displays the blood pressure value measured by the blood pressure measurement on the display 50 (step S140).

[0136] Next, Figure 5 The blood pressure measurement process in the measurement mode M1 of step S18 will be described.

[0137] Figure 8 This is a flowchart showing an example of the blood pressure measurement process in the measurement mode M1 of the sphygmomanometer 100 . Figure 8 The process shown is a process for measuring blood pressure by pressure measurement.

[0138] Reference Figure 8 , each process up to step S102 to S112 is Figure 6 The various processes are the same, so the detailed description will not be given again.

[0139] The processor 110 opens the valve 33 (step S112), and determines whether the series of blood pressure measurement processes up to steps S104 to S112 have been performed K times (where K ≥ 2) in succession (step S150). If the series of blood pressure measurement processes have not been performed K times (No in step S150), the processor 110 returns to the process of step S104. If the series of blood pressure measurement processes have been performed K times (Yes in step S150), the processor 110 displays the measured blood pressure value on the display 50 (step S152). At this time, the processor 110 can display the blood pressure values ​​of each K times, or can display the average value of the blood pressure values ​​of the K times.

[0140] Fig. 9 2 is a flowchart showing another example of the blood pressure measurement process in the measurement mode M1 of the sphygmomanometer 100 . Fig. 9 The process shown is a process of measuring blood pressure by a reduced pressure measurement method.

[0141] Reference Fig. 9 , each process up to step S122 to S138 and Figure 7 The various processes are the same, so the detailed description will not be given again.

[0142] The processor 110 fully opens the valve 33 (step S138), and determines whether the series of blood pressure measurement processes up to steps S124 to S138 have been performed K times (where K ≥ 2) in succession (step S160). If the series of blood pressure measurement processes have not been performed K times (No in step S160), the processor 110 returns to the process of step S124. If the series of blood pressure measurement processes have been performed K times (Yes in step S160), the processor 110 displays the measured blood pressure value on the display 50 (step S162). At this time, the processor 110 can display the blood pressure values ​​of each K times, or the average value of the blood pressure values ​​of the K times.

[0143] According to the above Figure 5 According to the flowchart, for a user who has arrhythmia during automatic measurement, the blood pressure measurement can be performed using the measurement mode M1 for performing multiple continuous measurements in the next blood pressure measurement to obtain multiple blood pressure values ​​or their average values. Therefore, even for this user, the blood pressure meter 100 can perform blood pressure measurement with high reliability.

[0144] (Mode setting process corresponding to occurrence of arrhythmia: Part 2)

[0145] Fig.10 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of arrhythmia.

[0146] Reference Fig.10 , each process from step S10 to step S22 is Figure 5 The various processes are the same, so the detailed description will not be given again.

[0147] When the processor 110 determines that arrhythmia has not occurred (No in step S22), the processor 110 sets the normal mode as the execution measurement mode (step S26). When the processor 110 determines that arrhythmia has occurred (Yes in step S22), the processor 110 determines whether the number of times arrhythmia has occurred in the most recent predetermined number of blood pressure measurements (e.g., five times) including the current blood pressure measurement is greater than or equal to a reference number of times (e.g., three times) (step S30).

[0148] If the number of times is greater than the reference number (Yes in step S30), processor 110 sets measurement mode M1 as the execution measurement mode (step S24). If the number of times is less than the reference number (No in step S30), processor 110 sets the normal mode as the execution measurement mode (step S26).

[0149] (Mode setting process corresponding to occurrence of arrhythmia: Part 3)

[0150] Fig.11 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of arrhythmia.

[0151] Reference Fig.11 , each process from step S10 to step S22 is Figure 5 The various processes are the same, so the detailed description will not be given again.

[0152] When the processor 110 determines that arrhythmia has not occurred (No in step S22), the processor 110 sets the normal mode as the execution measurement mode (step S26). When the processor 110 determines that arrhythmia has occurred (Yes in step S22), it determines whether arrhythmia has occurred for a predetermined number of times (for example, twice) in succession (step S40). When the predetermined number of times is two, the processor 110 determines whether arrhythmia has also occurred during the previous blood pressure measurement. When the predetermined number of times is three, the processor 110 determines whether arrhythmia has also occurred during the previous and the previous blood pressure measurements.

[0153] If arrhythmia occurs a predetermined number of times in succession (Yes in step S40), the processor 110 sets the measurement mode M1 as the execution measurement mode (step S24). If arrhythmia does not occur a predetermined number of times in succession (No in step S40), the processor 110 sets the normal mode as the execution measurement mode (step S26).

[0154] (Mode Setting Processing Corresponding to Occurrence of Irregular Pulse Wave: Part 1)

[0155] Fig.12 FIG. 1 is a flowchart showing an example of a process for setting a measurement mode according to whether or not an irregular pulse wave occurs. Fig.12 In the example, it is assumed that the normal mode or the measurement mode M2 ​​is set as the execution measurement mode. This will be described later. Fig.14 , Fig.15 The same is true in .

[0156] Reference Fig.12 , each process of steps S10 to S16 and S20 is Figure 5It should be noted that in step S12, when the currently set execution measurement mode is not the normal mode (No in step S12), the processor 110 determines that the execution measurement mode is the measurement mode M2.

[0157] When the processor 110 determines that the prescribed period has not passed since the previous blood pressure measurement (No in step S14), the processor 110 performs blood pressure measurement in the measurement mode M2 ​​(step S50). The blood pressure measurement process according to the measurement mode M2 ​​will be described later. Next, the processor 110 performs an arrhythmia determination process (step S58). Specifically, the processor 110 determines whether an arrhythmia has occurred based on the pulse wave signal obtained during the pressurization process when the blood pressure is measured according to the measurement mode M2. In this case, the processor 110 can display the determination result of the arrhythmia on the display 50.

[0158] In addition, the processor 110 determines whether an irregular pulse wave has occurred based on the pulse wave signal obtained when measuring the blood pressure in step S20 (step S52). If an irregular pulse wave has occurred (yes in step S52), the processor 110 sets the measurement mode M2 ​​as the execution measurement mode (step S54). If an irregular pulse wave has not occurred (no in step S52), the processor 110 sets the normal mode as the execution measurement mode (step S56).

[0159] Here, according to Fig.12 The blood pressure measurement process in the measurement mode M2 ​​in step S50 will be described. Fig.13 This is a flowchart showing an example of a blood pressure measurement process in the measurement mode M2 ​​of the sphygmomanometer 100 . Fig.13 The process shown is a process for measuring blood pressure by pressure measurement.

[0160] Reference Fig.13 The processing of steps S202 to S206 is respectively Figure 6 The processing of steps S102 to S106 is the same, so the detailed description thereof will not be given again.

[0161] During the pressurization process, the processor 110 measures (counts) the pulse wave number N1 based on the pulse wave signal extracted from the cuff pressure signal detected by the pressure sensor 31 (step S208). The processor 110 determines whether the pulse wave number N1 is greater than the threshold value Th1 (step S210). When the pulse wave number N1 is less than the threshold value Th1 (No in step S210), the processor 110 returns to the process of step S206, and the cuff 20 continues to be pressurized as long as the cuff pressure does not reach the upper pressure limit value Pmax (for example, 300 mmHg). When the pulse wave number N1 is greater than the threshold value Th1 (Yes in step S210), the processor 110 attempts to calculate the highest blood pressure (systolic blood pressure) and the lowest blood pressure (diastolic blood pressure), and determines whether the blood pressure calculation is completed (step S212).

[0162] When the blood pressure calculation is not completed (No in step S212), the processor 110 repeats the processing of steps S206 to S212 and continues the pressurization process as long as the cuff pressure does not reach the predetermined pressure upper limit value Pmax.

[0163] When the blood pressure calculation is completed (Yes in step S212), the processor 110 stops the pump 32 (i.e., stops the pressurization process) (step S214), opens the valve 33 (step S216), and controls the exhaust of air in the cuff 20. The processor 110 displays the blood pressure value obtained in step S212 on the display 50 (step S218).

[0164] Instead of the above-described processes of steps S208 to S212 , the following processes may be executed.

[0165] Specifically, after step S206, the processor 110 attempts to calculate the systolic blood pressure and the diastolic blood pressure to determine whether the blood pressure calculation is completed. If the blood pressure calculation is not completed, as long as the cuff pressure does not reach the upper pressure limit value Pmax, the processor 110 repeatedly performs the process starting from step S206 and continues the pressurization process.

[0166] When the blood pressure calculation is completed, the processor 110 determines whether the cuff pressure is greater than the pressure P1 of the measured systolic blood pressure. Typically, the pressure P1 is set to a value greater than the systolic blood pressure by a specified value (e.g., 40 mmHg). When the cuff pressure is less than the pressure P1, the processor 110 returns to step S206 to continue pressurizing the cuff 20. When the cuff pressure is greater than the pressure P1, the processor 110 measures the pulse wave number N1 based on the pulse wave signal during the pressurization process.

[0167] The processor 110 determines whether the pulse wave number N1 is greater than the threshold value Th1. If the pulse wave number N1 is less than the threshold value Th1, the processor 110 returns to the process of step S206 and continues to pressurize the cuff 20 as long as the cuff pressure does not reach the upper pressure limit value Pmax. If the pulse wave number N1 is greater than the threshold value Th1, the processor 110 executes the process of step S214. The processes after step S214 are the same as those of step S216. Fig.13 same.

[0168] According to the above Fig.12 According to the flowchart of FIG. 1 , for a user who has an irregular pulse wave during automatic measurement, the next blood pressure measurement is performed using the measurement mode M2 ​​in which the pressurization process is continued until the pulse wave number N1 becomes equal to or greater than the threshold value Th1. Therefore, in the process of measuring blood pressure, a sufficient pulse wave number is obtained to accurately detect arrhythmia determination, and a sufficient number of pulse wave intervals are obtained. Therefore, the sphygmomanometer 100 can more accurately perform arrhythmia determination after blood pressure measurement in the measurement mode M2.

[0169] For example, if arrhythmia is not detected based on the pulse wave signal obtained when measuring blood pressure in the measurement mode M2, the possibility that the user has arrhythmia is low. On the other hand, if arrhythmia is detected based on the pulse wave signal obtained when measuring blood pressure in the measurement mode M2, the possibility that the user has arrhythmia is high, and a warning or the like can be issued to the user. In this way, the sphygmomanometer 100 can perform arrhythmia determination with high reliability.

[0170] (Mode Setting Processing Corresponding to Occurrence of Irregular Pulse Wave: Part 2)

[0171] Fig.14 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of an irregular pulse wave.

[0172] Reference Fig.14 , each process of step S10 to step S52, S58 and Fig.12 The various processes are the same, so the detailed description will not be given again.

[0173] When the processor 110 determines that an irregular pulse wave has not occurred (No in step S52), the processor 110 sets the normal mode as the execution measurement mode (step S56). When the processor 110 determines that an irregular pulse wave has occurred (Yes in step S52), the processor 110 determines whether the number of times the irregular pulse wave has occurred in the most recent predetermined number of times (e.g., five times) is greater than or equal to a reference number of times (e.g., three times) (step S60).

[0174] If the number of times is greater than the reference number (Yes in step S60), the processor 110 sets the measurement mode M2 ​​as the execution measurement mode (step S54). If the number of times is less than the reference number (No in step S60), the processor 110 sets the normal mode as the execution measurement mode (step S56).

[0175] (Mode Setting Processing Corresponding to Occurrence of Irregular Pulse Wave: Part 3)

[0176] Fig.15 This is a flowchart showing another example of the process of setting the measurement mode according to the presence or absence of the irregular pulse wave.

[0177] Reference Fig.15 , each process of step S10 to step S52, S58 and Fig.12 The various processes are the same, so the detailed description will not be given again.

[0178] When the processor 110 determines that an irregular pulse wave has not occurred (No in step S52), the processor 110 sets the normal mode as the execution measurement mode (step S56). When the processor 110 determines that an irregular pulse wave has occurred (Yes in step S52), the processor 110 determines whether an irregular pulse wave has occurred a predetermined number of times (for example, twice) in succession (step S70).

[0179] If an irregular pulse wave occurs a predetermined number of times in succession (Yes in step S70), the processor 110 sets the measurement mode M2 ​​as the execution measurement mode (step S54). If an irregular pulse wave does not occur a predetermined number of times in succession (No in step S70), the processor 110 sets the normal mode as the execution measurement mode (step S56).

[0180] (Another example of mode setting corresponding to the occurrence of an irregular pulse wave)

[0181] exist Fig.12 , Fig.14 as well as Fig.15 In the mode setting process of , the configuration in which the measurement mode M2 ​​is set as the execution measurement mode when an irregular pulse wave occurs is described, but the present invention is not limited to this configuration. The measurement mode M1 or M3 may be set as the execution measurement mode when an irregular pulse wave occurs. Fig.12 , Fig.14 as well as Fig.15 The "measurement mode M2" in steps S12, S50 and S54 is replaced with "measurement mode M1" or "measurement mode M3". The blood pressure measurement process in the measurement mode M1 is as follows. Figure 8 and Fig. 9Here, the blood pressure measurement process in accordance with the measurement mode M3 is described.

[0182] Fig.16 This is a flowchart showing an example of a blood pressure measurement process in the measurement mode M3 of the sphygmomanometer 100 . Fig.16 The process shown is a process of measuring blood pressure by a reduced pressure measurement method.

[0183] Reference Fig.16 , the processing of steps S232 to S236 is Figure 7 The processing of steps S122 to S126 is the same, so the detailed description thereof will not be given. It should be noted that the pressurization process in the decompression measurement mode is started by the processing of step S236. At this time, the sphygmomanometer 100 controls the pressurization speed to be constant.

[0184] The processor 110 measures the pulse wave number N2 based on the pulse wave signal obtained during the pressurization process in the decompression measurement mode (step S238). The processor 110 determines whether the pulse wave number N2 is greater than the threshold value Th2 (step S240). When the pulse wave number N2 is less than the threshold value Th2 (no in step S240), the processor 110 returns to the process of step S236, and continues to pressurize the cuff 20 as long as the cuff pressure does not reach the upper pressure limit value Pmax. When the pulse wave number N2 is greater than the threshold value Th2 (yes in step S240), the processor 110 estimates the systolic blood pressure based on the pulse wave signal obtained during the pressurization process (step S242). The estimation of the systolic blood pressure is performed by a well-known method. The processor 110 determines whether the cuff pressure is greater than the pressure P2 (step S244). Typically, the pressure P2 is set to a value greater than the estimated systolic blood pressure by a specified value (e.g., 40 mmHg).

[0185] When the cuff pressure is less than the pressure P2 (No in step S244), the processor 110 returns to step S236 to continue pressurizing the cuff 20. When the cuff pressure is greater than the pressure P2 (Yes in step S244), the processor 110 controls to stop the pump 32 (i.e., stop the pressurization process) (step S246) and gradually open the valve 33 (step S248). Thus, the pressurization process is changed to the decompression process, and the cuff pressure is gradually decompressed. At this time, the processor 110 controls the decompression speed to be fixed.

[0186] During the decompression process, the processor 110 extracts the pulse wave signal from the cuff pressure signal detected by the pressure sensor 31, attempts to calculate the systolic blood pressure and the diastolic blood pressure based on the pulse wave signal, and determines whether the blood pressure calculation is completed (step S250). If the blood pressure calculation is not completed (no in step S250), the processor 110 repeatedly performs the processing of steps S248 and S250. If the blood pressure calculation is completed (yes in step S250), the processor 110 controls so that the valve 33 is fully opened (step S252) to rapidly discharge the air in the cuff 20. The processor 110 displays the blood pressure value obtained in step S250 on the display 50 (step S254).

[0187] Instead of the above-described processes of steps S238 to S244, the following processes may be executed.

[0188] Specifically, after step S236, the processor 110 estimates the systolic blood pressure based on the pulse wave signal obtained during the pressurization process in the decompression measurement mode. Next, the processor 110 determines whether the cuff pressure is equal to or greater than the pressure P2.

[0189] When the cuff pressure is less than pressure P2, the processor 110 returns to step S236 to continue pressurizing the cuff 20. When the cuff pressure is greater than pressure P2, the processor 110 measures the pulse wave number N2 based on the pulse wave signal obtained during the pressurization process. Next, the processor 110 determines whether the pulse wave number N2 is greater than a threshold value Th2.

[0190] When the pulse wave number N2 is less than the threshold value Th2, the processor 110 returns to the process of step S236 and continues to pressurize the cuff 20 as long as the cuff pressure does not reach the upper pressure limit value Pmax. When the pulse wave number N2 is greater than the threshold value Th2, the processor 110 executes the process of step S246. The processes after step S246 are the same as those of step S246. Fig.16 same.

[0191] exist Fig.12In the case where the "measurement mode M2" is replaced with the "measurement mode M3", for users who have irregular pulse waves during automatic measurement, the blood pressure measurement is performed using the measurement mode M3 in which the pressurization process is continued until the pulse wave number N2 reaches or exceeds the threshold value Th2 during the next blood pressure measurement. In the measurement mode M3, the pressurization process is continued until the pulse wave number N2 reaches or exceeds the threshold value Th2 during the pressurization process, so the cuff pressure at the beginning of the decompression process is set higher than usual. As a result, if the decompression speed of the cuff is fixed, the number of pulse waves obtained during the decompression process increases, and as a result, a sufficient number of pulse wave intervals are obtained. Therefore, as with the "measurement mode M2", the arrhythmia determination performed after the blood pressure measurement according to the "measurement mode M3" can be performed with higher accuracy. That is, the sphygmomanometer 100 can perform arrhythmia determination with high reliability.

[0192] exist Fig.12 In the case where the "measurement mode M2" is replaced with the "measurement mode M1", more pulse wave numbers can be obtained in one measurement by performing multiple consecutive blood pressure measurements. Therefore, in this case, the sphygmomanometer 100 can also perform arrhythmia determination with high reliability.

[0193] (Mode setting process according to occurrence of body movement)

[0194] Fig.17 FIG. 2 is a flowchart showing an example of a process for setting a measurement mode according to whether or not body movement occurs. Fig.17 In the example, the normal mode or the measurement mode M4 is set as the execution measurement mode.

[0195] Reference Fig.17 , each process of step S10, S20 and Figure 5 The various processes are the same, so the detailed description will not be given again.

[0196] When the instruction to start the automatic measurement is received (YES in step S10 ), processor 110 determines whether the currently set execution measurement mode is the normal mode (step S80 ).

[0197] When the measurement mode to be executed is the normal mode (Yes in step S80), blood pressure measurement is performed in the normal mode (step S20). When the measurement mode to be executed is not the normal mode (that is, the measurement mode to be executed is the measurement mode M4) (No in step S80), the processor 110 determines whether a specified period of time (for example, several tens of minutes) has passed since the previous blood pressure measurement (step S82). When the specified period of time has not passed (No in step S82), the processor 110 repeatedly performs the process of step S82. When the specified period of time has passed (Yes in step S82), the processor 110 performs blood pressure measurement in the measurement mode M4 (step S84). That is, the processor 110 performs the same blood pressure measurement process as in the normal mode (for example, Figure 6 or Figure 7 Flow chart of the method) to perform re-measurement of blood pressure.

[0198] Next, the processor 110 determines whether the user has made body movements while measuring blood pressure (step S86). If no body movements have occurred (No in step S86), the processor 110 sets the normal mode as the execution measurement mode (step S92). If body movements have occurred (Yes in step S86), the processor 110 determines whether the cumulative number of measurements since the start of automatic measurement is less than J times (for example, three times) (step S88).

[0199] If the cumulative number of measurements is J or more (No in step S88), the processor 110 sets the normal mode as the execution measurement mode (step S92). If the cumulative number of measurements is less than J (Yes in step S88), the processor 110 sets the measurement mode M4 as the execution measurement mode (step S90), and returns to the process of step S80. That is, the blood pressure is remeasured.

[0200] according to Fig.17 According to the flowchart of , the measurement mode M4 is set for the user who has body movement during the automatic measurement, and the blood pressure is automatically remeasured. Therefore, the blood pressure meter 100 can perform blood pressure measurement with high reliability.

[0201] <Other Implementation Methods>

[0202] (1) In the above-mentioned embodiment, Figure 5 , Fig.10 , Fig.11 In the above description, the measurement mode M1 is set in step S24, and the blood pressure measurement in the measurement mode M1 is performed in step S18 in the next automatic measurement, but the present invention is not limited to this configuration. Figure 5 , Fig.10 , Fig.11When the measurement mode M1 is set in step S24 , the sphygmomanometer 100 may be configured to perform blood pressure measurement in the measurement mode M1 immediately after step S24 .

[0203] Similarly, in Fig.12 , Fig.14 , Fig.15 When the measurement mode M2 ​​is set in step S54, the sphygmomanometer 100 may be configured to perform blood pressure measurement in the measurement mode M2 ​​immediately after step S54. As described above, the measurement mode M1 or the measurement mode M3 may be set instead of the measurement mode M2.

[0204] According to the above configuration, when the user experiences a certain phenomenon (such as arrhythmia, irregular pulse wave, body movement) during automatic measurement, blood pressure measurement in a more reliable measurement mode can be immediately performed without waiting for the next measurement opportunity.

[0205] (2) In the above-mentioned embodiment, a program for enabling a computer to function to execute the control described in the above-mentioned flowchart can also be provided. Such a program can be recorded on a non-temporary computer-readable recording medium such as a floppy disk, a CD-ROM (Compact Disc Read Only Memory), a secondary storage device, a main storage device, and a memory card attached to the computer, and provided as a program product. Alternatively, the program can also be provided by recording on a recording medium such as a hard disk built into the computer. In addition, the program can also be provided by downloading via a network.

[0206] (3) The configuration illustrated as an example of the above-mentioned embodiment is an example of the configuration of the present invention, and can also be combined with other known technologies, and can be configured to omit a part and make changes within the scope of the main purpose of the present invention. In addition, in the above-mentioned embodiment, the processing and configuration described in other embodiments can also be appropriately adopted for implementation.

[0207] [Note]

[0208] As described above, the present embodiment includes the following disclosures.

[0209] [Composition 1]

[0210] A sphygmomanometer (100) measures blood pressure by compressing a user's measured part with a cuff (20), wherein the sphygmomanometer (100) comprises a blood pressure measuring unit (210), wherein the blood pressure measuring unit (210) automatically performs blood pressure measurement in accordance with a predetermined schedule in any one of a plurality of blood pressure measurement modes, wherein the plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes having a higher reliability of measurement results than the normal measurement mode.

[0211] The sphygmomanometer (100) further comprises: a determination unit (220) for determining whether any one of a plurality of predetermined phenomena has occurred to the user when the blood pressure measurement unit (210) performs blood pressure measurement; and a mode setting unit (225) for setting an execution measurement mode to be performed by the blood pressure measurement unit (210) from among the plurality of blood pressure measurement modes based on the determination result of the determination unit (220); the mode setting unit (225) setting the normal measurement mode as the execution measurement mode when any one of the plurality of phenomena has not occurred, and setting any one of the plurality of measurement modes as the execution measurement mode when any one of the plurality of phenomena has occurred.

[0212] [Composition 2]

[0213] According to the blood pressure meter (100) described in configuration 1, wherein the multiple measurement modes include a first measurement mode for performing blood pressure measurement more than one time in succession, the determination unit (220) determines whether the user has arrhythmia based on a pulse wave signal obtained when the blood pressure measurement is performed by the blood pressure measurement unit (210), and the mode setting unit (225) sets the normal measurement mode or the first measurement mode as the execution measurement mode based on the presence or absence of the arrhythmia.

[0214] [Composition 3]

[0215] According to the sphygmomanometer (100) described in configuration 2, the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the arrhythmia has not occurred, and sets the first measurement mode as the execution measurement mode when the arrhythmia has occurred.

[0216] [Composition 4]

[0217] According to the blood pressure meter (100) described in configuration 2, the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the arrhythmia has not occurred, and the mode setting unit (225) sets the first measurement mode as the execution measurement mode when the arrhythmia has occurred and the number of times the arrhythmia has occurred in the most recent specified number of blood pressure measurements is greater than a benchmark number of times.

[0218] [Composition 5]

[0219] According to the sphygmomanometer (100) described in configuration 2, the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the arrhythmia does not occur, and the mode setting unit (225) sets the first measurement mode as the execution measurement mode when the arrhythmia occurs continuously for a specified number of times.

[0220] [Composition 6]

[0221] According to the blood pressure meter (100) described in any one of structures 2 to 5, the blood pressure measuring unit (210) determines whether a specified period has passed since the previous blood pressure measurement when the first measurement mode is set, and the blood pressure measuring unit (210) performs blood pressure measurement in accordance with the first measurement mode if the specified period has not passed, and performs blood pressure measurement in accordance with the normal measurement mode if the specified period has passed.

[0222] [Composition 7]

[0223] According to the blood pressure meter (100) described in any one of structures 1 to 6, wherein the multiple measurement modes include a second measurement mode, the blood pressure measuring unit (210) measures the user's blood pressure based on the pulse wave signal in the first pressurization process when in the normal measurement mode, wherein the first pressurization process pressurizes the cuff pressure representing the internal pressure of the cuff worn on the measured part of the user, the determination unit (220) determines whether the user has an irregular pulse wave based on the pulse wave signal in the first pressurization process, and the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the irregular pulse wave does not occur, and sets the second measurement mode as the execution measurement mode when the irregular pulse wave occurs.

[0224] [Composition 8]

[0225] According to the blood pressure meter (100) described in configuration 7, wherein the blood pressure measuring unit (210) measures the user's blood pressure based on the pulse wave signal during the first pressurization process in the second measurement mode, the blood pressure measuring unit (210) continues the first pressurization process until the first pulse wave number of the user obtained based on the pulse wave signal during the first pressurization process reaches above a threshold value, and the determination unit (220) determines whether the user has arrhythmia based on the pulse wave signal during the first pressurization process.

[0226] [Composition 9]

[0227] According to the blood pressure meter (100) described in any one of structures 1 to 8, wherein the multiple measurement modes include a third measurement mode, the blood pressure measuring unit (210) measures the user's blood pressure in the normal measurement mode based on a pulse wave signal during a decompression process in which the cuff pressure is decompressed after a second pressurization process, wherein the second pressurization process pressurizes the cuff pressure representing the internal pressure of the cuff worn on the measured part of the user to a pressure greater than the estimated systolic blood pressure, the determination unit (220) determines whether the user has an irregular pulse wave based on the pulse wave signal during the decompression process, and the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the irregular pulse wave does not occur, and sets the third measurement mode as the execution measurement mode when the irregular pulse wave occurs.

[0228] [Composition 10]

[0229] According to the blood pressure meter (100) described in configuration 9, wherein the blood pressure measuring unit (210) measures the user's blood pressure based on the pulse wave signal during the decompression process after the second pressurization process in the third measurement mode, the blood pressure measuring unit (210) continues the second pressurization process until the second pulse wave number of the user obtained based on the pulse wave signal during the second pressurization process reaches above a threshold value, and the determination unit (220) determines whether the user has arrhythmia based on the pulse wave signal during the decompression process.

[0230] [Composition 11]

[0231] A blood pressure meter (100) according to any one of structures 1 to 10, wherein the plurality of measurement modes include a fourth measurement mode for re-measuring the blood pressure when body movement of the user occurs, the determination unit (220) determines whether the body movement has occurred based on a pulse wave signal obtained when the blood pressure measurement is performed by the blood pressure measurement unit (210), and the mode setting unit (225) sets the normal measurement mode or the fourth measurement mode as the execution measurement mode based on the presence or absence of the body movement.

[0232] [Composition 12]

[0233] According to the blood pressure meter (100) described in configuration 11, the mode setting unit (225) sets the normal measurement mode as the execution measurement mode when the body movement does not occur during the current blood pressure measurement, and the mode setting unit (225) sets the fourth measurement mode as the execution measurement mode when the body movement occurs during the current blood pressure measurement and the cumulative number of blood pressure measurements is less than the first number.

[0234] [Composition 13]

[0235] A blood pressure measurement method is a blood pressure measurement method performed by a sphygmomanometer (100) that measures blood pressure by compressing a user's measured part through a cuff (20), wherein the blood pressure measurement method includes a step of automatically performing blood pressure measurement in any one of a plurality of blood pressure measurement modes according to a predetermined schedule, the plurality of blood pressure measurement modes including a normal measurement mode and a plurality of measurement modes with higher reliability related to measurement results than the normal measurement mode, the blood pressure measurement method also includes the following steps: when performing the blood pressure measurement, determining whether any one of a plurality of predetermined phenomena has occurred to the user; and based on the determination result obtained by the determination step, setting an execution measurement mode to be executed in the execution step from among the plurality of blood pressure measurement modes, the setting step including: when any one of the plurality of phenomena has not occurred, setting the normal measurement mode as the execution measurement mode, and when any one of the plurality of phenomena has occurred, setting any one of the plurality of measurement modes as the execution measurement mode.

[0236] The embodiments disclosed this time should be considered as illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

[0237] Description of Reference Numerals

[0238] 10: Main body; 20: Cuff; 22: Fluid bag; 30: Air system component; 31: Pressure sensor; 32: Pump; 33: Valve; 34: Acceleration sensor; 50: Display; 51: Memory; 52: Operation unit; 52A: Measurement switch; 52B: Automatic measurement switch; 53: Communication interface; 54: Power supply unit; 100: Sphygmomanometer; 110: Processor; 210: Blood pressure measurement unit; 215: Pulse wave number measurement unit; 220: Determination unit; 225: Mode setting unit; 230: Output control unit; 310, 340: A / D conversion circuit; 320: Pump drive circuit; 330: Valve drive circuit.

Claims

1. A sphygmomanometer that measures blood pressure by compressing a user's measured area with a cuff, wherein: The sphygmomanometer includes a blood pressure measuring unit that automatically performs blood pressure measurement in accordance with a predetermined schedule in any one of a plurality of blood pressure measurement modes. The plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes having a higher reliability of measurement results than the normal measurement mode, The sphygmomanometer further comprises: a determination unit that determines whether any one of a plurality of predetermined phenomena occurs to the user when the blood pressure measurement unit performs blood pressure measurement; as well as a mode setting unit that sets a measurement mode to be performed by the blood pressure measurement unit from among the plurality of blood pressure measurement modes based on the determination result of the determination unit, The mode setting unit sets the normal measurement mode as the execution measurement mode when any of the plurality of phenomena does not occur, and sets any of the plurality of measurement modes as the execution measurement mode when any of the plurality of phenomena occurs.

2. The sphygmomanometer according to claim 1, wherein: The plurality of measurement modes include a first measurement mode in which blood pressure measurement is performed continuously a plurality of times or more. The determination unit determines whether the user has arrhythmia based on a pulse wave signal obtained when the blood pressure measurement unit performs blood pressure measurement, The mode setting unit sets the normal measurement mode or the first measurement mode as the execution measurement mode based on whether the arrhythmia occurs.

3. The sphygmomanometer according to claim 2, wherein: The mode setting unit sets the normal measurement mode as the execution measurement mode when the arrhythmia has not occurred, and sets the first measurement mode as the execution measurement mode when the arrhythmia has occurred.

4. The sphygmomanometer according to claim 2, wherein: The mode setting unit sets the normal measurement mode as the execution measurement mode when the arrhythmia does not occur. When the arrhythmia occurs, the mode setting unit sets the first measurement mode as the execution measurement mode if the number of occurrences of the arrhythmia in the most recent predetermined number of blood pressure measurements is equal to or greater than a reference number of times.

5. The sphygmomanometer according to claim 2, wherein: The mode setting unit sets the normal measurement mode as the execution measurement mode when the arrhythmia does not occur. The mode setting unit sets the first measurement mode as the execution measurement mode when the arrhythmia occurs a predetermined number of times in succession.

6. The sphygmomanometer according to any one of claims 2 to 5, wherein: The blood pressure measurement unit determines whether a predetermined period has passed since the last blood pressure measurement when the first measurement mode is set. If the predetermined period has not elapsed, the blood pressure measurement unit performs blood pressure measurement in accordance with the first measurement mode. When the predetermined period has elapsed, the blood pressure measurement unit performs blood pressure measurement in the normal measurement mode.

7. The sphygmomanometer according to any one of claims 1 to 5, wherein The plurality of measurement modes include a second measurement mode, In the normal measurement mode, the blood pressure measurement unit The blood pressure of the user is measured based on the pulse wave signal in a first pressurization process, wherein the first pressurization process pressurizes the cuff pressure indicating the internal pressure of the cuff worn on the measured part of the user, The determination unit determines whether the user has an irregular pulse wave based on the pulse wave signal during the first pressurization process, The mode setting unit sets the normal measurement mode as the execution measurement mode when the irregular pulse wave has not occurred, and sets the second measurement mode as the execution measurement mode when the irregular pulse wave has occurred.

8. The sphygmomanometer according to claim 7, wherein: When the blood pressure measurement unit is in the second measurement mode, measuring the user's blood pressure based on the pulse wave signal during the first pressurization process, The blood pressure measurement unit continues the first pressurization process until the first pulse wave number of the user acquired based on the pulse wave signal during the first pressurization process reaches or exceeds a threshold value, The determination unit determines whether the user has arrhythmia based on the pulse wave signal during the first pressurization process.

9. The sphygmomanometer according to any one of claims 1 to 5, wherein: The plurality of measurement modes include a third measurement mode, In the normal measurement mode, the blood pressure measurement unit The blood pressure of the user is measured based on a pulse wave signal during a decompression process in which the cuff pressure is decompressed after a second pressurization process, wherein the second pressurization process pressurizes the cuff pressure representing the internal pressure of the cuff worn on the measured part of the user to a pressure greater than the estimated systolic blood pressure, The determination unit determines whether the user has an irregular pulse wave based on the pulse wave signal during the decompression process, The mode setting unit sets the normal measurement mode as the execution measurement mode when the irregular pulse wave has not occurred, and sets the third measurement mode as the execution measurement mode when the irregular pulse wave has occurred.

10. The sphygmomanometer according to claim 9, wherein: When the blood pressure measurement unit is in the third measurement mode, measuring the blood pressure of the user based on the pulse wave signal during the decompression process after the second pressurization process, The blood pressure measurement unit continues the second pressurization process until the second pulse wave number of the user acquired based on the pulse wave signal during the second pressurization process reaches or exceeds a threshold value, The determination unit determines whether the user has arrhythmia based on a pulse wave signal during the decompression process.

11. The sphygmomanometer according to any one of claims 1 to 5, wherein The plurality of measurement modes include a fourth measurement mode for re-measuring blood pressure when body movement of the user occurs, The determination unit determines whether the body movement has occurred based on a pulse wave signal obtained when the blood pressure measurement unit performs blood pressure measurement, The mode setting unit sets the normal measurement mode or the fourth measurement mode as the execution measurement mode based on whether the body movement occurs.

12. The sphygmomanometer according to claim 11, wherein: The mode setting unit sets the normal measurement mode as the execution measurement mode when the body movement does not occur during the current blood pressure measurement. The mode setting unit sets the fourth measurement mode as the execution measurement mode when the body movement occurs during the current blood pressure measurement and the cumulative number of blood pressure measurements is less than the first number.

13. A blood pressure measurement method, the blood pressure measurement method being a blood pressure measurement method performed by a sphygmomanometer that measures blood pressure by compressing a user's measurement site with a cuff, wherein: The blood pressure measurement method includes the step of automatically performing blood pressure measurement in any one of a plurality of blood pressure measurement modes according to a predetermined schedule, The plurality of blood pressure measurement modes include a normal measurement mode and a plurality of measurement modes having a higher reliability of measurement results than the normal measurement mode, The blood pressure measurement method further comprises the following steps: When the blood pressure measurement is performed, determining whether any one of a plurality of predetermined phenomena occurs to the user; and setting an execution measurement mode to be executed in the execution step from among the plurality of blood pressure measurement modes based on the determination result obtained in the determination step, The setting step includes: setting the normal measurement mode as the execution measurement mode when any of the multiple phenomena does not occur, and setting any of the multiple measurement modes as the execution measurement mode when any of the multiple phenomena occurs.

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