JP2010099383A - Electronic blood pressure meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out blood pressure measurement early in the morning or during night by determining its timing by a simple system. <P>SOLUTION: In the electronic pressure meter, a meter body 10 is detachably mounted on a cuff 20. When a subject sleeps, he/she winds the cuff 20 around his/her wrist, after removing the meter body 10 from it. The duration of the subject's sleep is detected by signals from his body movements detected by an acceleration sensor 26 and signals from his body temperature detected by a temperature sensor 27, both incorporated in the cuff 20. Prior to or subsequent to the duration of the subject's sleep detected, his blood pressure measurement is done by circuits within the meter body 10 integrally mounted to the cuff 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic sphygmomanometer, and more particularly, to an electronic sphygmomanometer that can make a determination in consideration of the sleep time of a person to be measured for blood pressure measurement.

  Normally, blood pressure is low while sleeping at night, but gradually increases after waking up. It is considered to be 'early morning hypertension' especially when the early morning rise is remarkable. People with early morning hypertension are at high risk for cerebrovascular disease and ischemic heart disease. In general, the blood pressure at night is lower than the daytime and the pulse is considerably reduced, so the burden on the heart and blood vessels is much lighter. The risk of stroke is said to increase.

  Therefore, home blood pressure management is important in order to detect early morning / nighttime hypertension, and morning and night blood pressure must be measured daily or repeatedly.

  Since the clock function of the sphygmomanometer is used to record the time when blood pressure is measured, an accurate clock function is important in detecting early morning / nighttime hypertension.

  However, most of the time adjustment of the clock function of the conventional blood pressure monitor is manually set by the user. Conventional sphygmomanometers can measure without an appropriate time setting, and battery-powered devices need to be reset every time the battery is replaced, so the time setting is neglected.

  In addition, when a function for automatically setting the time such as a radio clock is provided, the time cannot be corrected in a place or region where the radio wave does not reach.

Therefore, a function for measuring time (sleep) information unique to the human body based on information obtained from the human body has been proposed. Patent Document 1 discloses a function for detecting and measuring the sleep cycle of a human body, and Patent Document 2 discloses a function for detecting a period of rest from biological information while sleeping. Patent Document 3 discloses a function for measuring the timing of blood pressure measurement based on the sleep depth of the subject.
Japanese Patent Laid-Open No. 8-122452 JP-A-8-317909 JP 2007-229238 A

  In the conventional electronic sphygmomanometer clock function, the time was set by the user, and in the battery-driven electronic sphygmomanometer, the user had to reset the clock when replacing the battery. If the user feels bothered, the appropriate time cannot be set. In addition, the conventional electronic sphygmomanometer can measure blood pressure without setting the time. Therefore, in such a case, blood pressure is measured without setting the time, so the time recorded as the measurement result is not reliable, and the tendency of early morning / night hypertension cannot be accurately determined.

  It is also possible to use means such as a radio timepiece in order to omit time adjustment by the user. However, the correct time cannot be set in places or areas where radio waves do not reach.

  Even if the time is set appropriately, it may be difficult to determine the tendency of early morning / night hypertension from the measurement time of the measurement result. In other words, the rhythm of life is different for each person to be measured, and when the life rhythm is reversed day and night like a shift worker, even if a clock with an accurate time setting is used, the early morning according to the life rhythm of each person to be measured And it is not possible to clearly determine the measurement time zone at night.

  However, Patent Document 1 merely provides a clock function that outputs an alarm with respect to the sleep cycle, and cannot provide a measurement timing for measuring the early morning / nighttime hypertension of the measurement subject. Further, Patent Document 2 also detects a resting state while sleeping, but cannot provide a measurement timing for measuring the early morning / nighttime hypertension of the measurement subject. Moreover, in patent document 2, it is necessary to prepare the bed incorporating an apparatus, and an apparatus becomes large and is not realistic. Moreover, in patent document 3, only the blood pressure measurement timing is obtained based on the depth of sleep, and the measurement timing for measuring the early morning / nighttime hypertension of the measurement subject cannot be provided.

  Therefore, an object of the present invention is to provide an electronic sphygmomanometer that performs blood pressure measurement by obtaining a measurement timing for early morning / night blood pressure measurement with a simple configuration regardless of the life rhythm of the subject. is there.

  According to one aspect of the present invention, an electronic sphygmomanometer that measures a subject's blood pressure includes a memory unit, a winding member that is wound around a wrist of a living body, a measurement unit that measures blood pressure, and data in the memory unit Based on the analysis result, a period detection unit that detects a sleep period, a measurement bag that is wound around a measurement site of a living body and expands when a fluid is supplied during measurement, and a period detection unit Before and after the sleep period, and a control unit that causes the measurement unit to measure blood pressure. The measurement unit measures the internal pressure of the measurement bag at the time of measurement, and the blood pressure based on the internal pressure measured by the pressure sensor. A wrapping member that receives an acceleration sensor for detecting body movement, a temperature sensor for detecting body temperature, and a detection signal from the acceleration sensor and the temperature sensor, Detection signal Further comprising a data acquisition unit for storing a time series of input data to the memory unit.

  Preferably, the period detection unit analyzes the detection signal levels of the acceleration sensor and the temperature sensor indicated by the data in the memory unit based on a predetermined condition for determining the sleep period, and detects the sleep period.

  Preferably, the apparatus further includes a readable blood pressure storage unit that stores the blood pressure calculated by the blood pressure calculation unit in association with the measurement time data.

  Preferably, based on the difference between the measurement time data indicating the most recent time in the blood pressure storage unit and the start time of the sleep period, the blood pressure associated with the measurement time data is determined as the bedtime blood pressure.

  Preferably, the blood pressure storage unit stores data indicating the bedtime blood pressure in association with the bedtime blood pressure and the determined blood pressure.

  Preferably, based on the difference between the measurement time data indicating the most recent time in the blood pressure storage unit and the end time of the sleep period, the blood pressure associated with the measurement time data is determined as the wake-up blood pressure.

  Preferably, the blood pressure storage unit stores data indicating the wake-up blood pressure in association with the determined blood pressure.

  Preferably, the blood pressure storage unit stores the data of the sleep period in association with the blood pressure calculated by the blood pressure calculation unit.

  Preferably, the winding member is replaced with a measurement bag, and the measurement unit is detachably attached to the measurement bag.

Preferably, the elapsed time after the sleep period is output.
Preferably, a timer that measures the current time is further provided, and a message that prompts the user to set the timer is output according to a difference between the calculated bedtime / wake-up time and a preset time.

  According to the present invention, the sleep period of the person to be measured from the detection signal of the body movement detected by the acceleration sensor included in the winding member wound around the wrist of the living body and the detection signal of the body temperature detected by the temperature sensor. Can be determined whether blood pressure measurement was performed before and after the detected sleep period.

  Therefore, the blood pressure measurement can be performed with a simple configuration using the wrapping member with the measurement timing for the early morning / night blood pressure measurement regardless of the life rhythm of the measurement subject.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts, and description thereof will not be repeated.

  Here, in the present embodiment, “sleeping” refers to an operation in which the measurement subject enters the floor, and “wakes up” refers to an operation in which the measurement subject wakes up from sleep and gets up. The time when the subject enters the sleep state after going to sleep is called 'sleeping', and the awakening from sleep is called 'wakening'.

FIG. 1 is a view showing an appearance of a wrist electronic sphygmomanometer 1 according to an embodiment of the present invention.
Referring to FIG. 1, an electronic sphygmomanometer 1 includes a main body 10 and a cuff 20 that can be wound around the limb of a person to be measured. The main body 10 is attached to the cuff 20. On the surface of the main body unit 10, a display unit 40 made of, for example, liquid crystal and an operation unit 41 for receiving instructions from a user (a person to be measured) are arranged. The operation unit 41 includes a plurality of switches.

In the present embodiment, the cuff 20 is attached to the wrist of the measurement subject.
FIG. 2 is a diagram showing the concept of controlling the cuff pressure for blood pressure measurement in electronic blood pressure monitor 1 according to the embodiment of the present invention. FIG. 2 shows a state where the cuff 20 is attached to the wrist 200 of the measurement subject.

  Referring to FIG. 2, a cuff pressure adjusting mechanism including a pump 51 and an exhaust valve (hereinafter simply referred to as “valve”) 52 is disposed in the main body 10.

  An air system 30 including a pump 51, a valve 52, and a pressure sensor 32 for detecting the pressure (cuff pressure) in the air bladder 21 is connected to the air bladder 21 contained in the cuff 20 via an air tube 31. Is done. Thus, since the air system 30 is provided in the main body part 10, the thickness of the cuff 20 can be kept thin.

  FIG. 3 is a block diagram showing a hardware configuration of electronic blood pressure monitor 1 according to the embodiment of the present invention.

  Referring to FIG. 3, the cuff 20 of the electronic sphygmomanometer 1 includes an air bag 21, a substrate 22 on which various circuits are arranged, a battery 28 that supplies power to the circuit of the substrate 22, and a cuff side wearing detection switch. 29.

  The substrate 22 includes a CPU (Central Processing Unit) 24, a memory unit 23 and an I / F (abbreviation of interface) 25 connected to the CPU 24, an acceleration sensor 26 that provides detection data to the CPU 24 via the I / F 25, and a temperature. A sensor 27 is provided. The acceleration sensor 26 detects the tilt angle of the wrist around which the cuff 20 is wound. The temperature sensor 27 detects the body temperature at the site where the cuff 20 is worn.

  In addition to the display unit 40 and the operation unit 41 described above, the main unit 10 centrally controls each unit and performs various arithmetic processes, and a program that causes the CPU 100 to perform predetermined operations. And a memory unit 42 for storing various data including blood pressure data, a power source 44 for supplying power to each unit of the main body unit 10, and a timer 45 for measuring the current time and outputting the time measurement data to the CPU 100. Including. The operation unit 41 includes a power switch 41A that receives an input of an instruction to turn on or off the power, a measurement switch 41B that receives an instruction to start measurement, a stop switch 41C that receives an instruction to stop measurement, and a memory Memory switch 41D for accepting an instruction to read out information such as blood pressure recorded in the unit 42 and display it on the display unit 40, and an ID operated to input ID (Identifier) information for identifying the person to be measured A switch 41E is provided.

  The main body 10 further includes an I for transmitting and receiving signals between the air system 30, the cuff pressure adjusting mechanism 50, the oscillation circuit 33, the main body side mounting detection switch 46, and the CPU 100 and the substrate 22. / F (interface) 47. Communication between the CPU 100 and the substrate 22 is performed by a radio signal such as infrared rays. The I / F 25 and the I / F 47 correspond to, for example, a light emitting unit, a light receiving unit, and a modem unit for infrared communication.

  The adjustment mechanism 50 includes a pump drive circuit 53 and a valve drive circuit 54 in addition to the pump 51 and the valve 52.

  The pump 51 supplies air to the air bladder 21 in order to increase the cuff pressure. The valve 52 is opened and closed to exhaust or seal the air in the air bladder 21. The pump drive circuit 53 controls the drive of the pump 51 based on a control signal given from the CPU 100. The valve drive circuit 54 performs opening / closing control of the valve 52 based on a control signal given from the CPU 100.

  The pressure sensor 32 is, for example, an electrostatic capacitance type pressure sensor, and the capacitance value changes depending on the cuff pressure. The oscillation circuit 33 is connected to the pressure sensor 32 and outputs an oscillation frequency signal corresponding to the capacitance value of the pressure sensor 32 to the CPU 100. The CPU 100 detects a pressure by converting a signal obtained from the oscillation circuit 33 into a pressure.

  As shown in FIGS. 4 and 5, in the electronic sphygmomanometer 1 according to the embodiment of the present invention, the main body 10 is detachably attached to the cuff 20.

  The cuff side device detection switch 29 and the main body side attachment detection switch 46 have a function of detecting whether the main body portion 10 is attached to the cuff 20 and both are integrally connected. The detection result of the cuff side device detection switch 29 is given to the CPU 24 mounted on the substrate 22, and the detection result of the main body side attachment detection switch 46 is given to the CPU 100. Even if only one of the cuff-side device detection switch 29 and the main-body-side device detection switch 46 is used, the function of detecting whether the main body portion 10 is attached to the cuff 20 and both are integrally connected is realized. Good.

  The main body unit 10 is provided with a main body side mounting detection switch 46. The main body side attachment detection switch 46 detects whether or not the cuff 20 and the main body 10 are integrally connected, and outputs the detection result to the CPU 100.

  A separable configuration of the wrist electronic blood pressure monitor 1 shown in FIG. 1 will be described. Referring to FIGS. 4 and 5, the main body 10 is detachably attached to the cuff 20. In FIG. 4, pipe portions 20 </ b> A and 20 </ b> B connected to the internal air tube 31 are provided on the surface of the cuff 20 on which the main body portion 10 is mounted, and a hook-shaped locking portion for attaching the main body portion 10. 20X, 20Y and 20Z. On the other hand, with reference to FIG. 5, pipe surfaces 10 </ b> A and 10 </ b> B connected to the internal air tube 31 are provided on the surface of the casing of the main body 10 that contacts the surface of the cuff 20 when attached to the cuff 20. Hole-shaped portions 10X, 10Y and 10Z for locking the portion 10 to the cuff 20 are formed in advance.

  When attaching the main body 10 to the cuff 20, the measurement subject aligns the locking portions 20X, 20Y and 20Z made of hook-shaped members with the hole-shaped portions 10X, 10Y and 10Z of the main body 10, respectively. To engage. FIG. 6 shows a state in which the hooks of the locking portions 20X, 20Y and 20Z of the cuff 20 are viewed from the side. Thereby, the main body 10 is locked to the cuff 20. As described above, in the electronic sphygmomanometer 1, a connecting portion that locks and connects the main body 10 on the cuff 20 is configured. That is, in the connecting portion, the locking portion 20X, 20Y and 20Z of the cuff 20 and the portions 10X, 10Y and 10Z of the body portion 10 corresponding to each of them can be engaged and disengaged so that the body portion 10 is on the cuff 20. Locked.

  In a state where the main body portion 10 is locked to the cuff 20 by the connecting portion, the main body portion 10 and the cuff 20 are integrated as shown in FIG. In this state, each of the tube portions 10 </ b> A and 10 </ b> B provided in the main body 10 is in a mating state with each of the tube portions 20 </ b> A and 20 </ b> B of the cuff 20. That is, the diameters of the pipes of the portions 10A and 10B and the diameters of the pipes 20A and 20B are different from each other.

  In the present embodiment, the main body portion 10 is detachably attached to the cuff 20, but whether or not the main body portion 10 is attached to the cuff 20 is detected by the cuff side device detection switch 29 and the main body side attachment detection switch 46. Is done.

  With reference to FIG. 7 and FIG. 8, the detection mechanism of whether the main-body part 10 is mounted | worn with the cuff 20 via the above-mentioned connection part is demonstrated. Referring to FIGS. 7A to 7C, the simplest detection method uses a push button switch. In the main body side mounting detection switch 46 of the main body 10, a protruding and retractable portion usually protrudes from the surface of the main body 10 where the main body 10 is mounted with the cuff 20 of the housing. In the state shown in FIG. 7A, the main body 10 is not attached to the cuff 20, so the main body side detection switch 46 is in an OFF state. At this time, the main body side detection switch 46 sends an “OFF” signal to the CPU 100. Output to.

  As shown in FIG. 7C, when the main body 10 is mounted on the cuff 20, the protruding portion of the main body side mounting detection switch 46 is pressed by the contact surface with the cuff 20 and contracts accordingly. As a result, the main body side mounting detection switch 46 changes from the state of FIG. 7A to FIG. 7B. In the state of FIG. 7B, an “ON” signal is output to the CPU 100 from the main body side attachment detection switch 46. After that, when the main body 10 is removed from the cuff 20, the contracted protruding portion of the main body side attachment detection switch 46 expands to return to the original state and is turned off. At this time, the main body side mounting detection switch 46 outputs an “OFF” signal to the CPU 100.

  In the state detection in which the main body portion 10 is mounted on the cuff 20 via the connecting portion, a cuff side mounting detection switch 29 is provided. The cuff-side attachment detection switch 29 may be realized by the push button switch shown in FIGS. When the main body 10 is attached, an “ON signal” is output to the CPU 24, and when nothing is hit (when the main body 10 is removed from the cuff 20), an “OFF signal” is output to the CPU 24. Output to.

  Whether or not the main body portion 10 is attached to the cuff 20 is not limited to the one using the push button switch shown in FIGS. 7A to 7C, and may be a method as shown in FIG. FIG. 8 shows a method using an optical sensor, for example. In FIG. 8, the main body side mounting detection switch 46 is replaced by an optical sensor 463. The optical sensor 463 includes a light emitting element 461 and a light receiving element 462. In a state where the cuff 20 is not attached to the main body 10, the light output from the light emitting element 461 is received by the light receiving element 462 without being interrupted, and is not attached to the cuff 20 according to the received light level. An “OFF” signal indicating this is output. On the other hand, when the main body 10 is attached to the cuff 20, the projection member 291 blocks the light path between the light emitting element 461 and the light receiving element 462, so that the light receiving level of the light receiving element 462 decreases and the light sensor 463 An “ON” signal indicating that the cuff 20 is attached is derived according to the received light level and is given to the CPU 100.

  The acceleration sensor 26 according to the present embodiment will be described with reference to FIGS. In the present embodiment, the acceleration sensor 26 is also used as a height guide function for notifying by sound or display when the wrist equipped with the electronic sphygmomanometer 1 of FIG. 1 comes to the height of the heart.

  Here, the height guide function is for guiding a correct measurement posture using the wrist electronic sphygmomanometer 1. As shown in FIG. 10 (A), for the purpose of adjusting the wrist, which is the measurement site, to the height of the heart, guide information is sounded or displayed on the display unit 40 when the wrist comes to the heart level. An image such as B) is notified.

  The detection signal of the acceleration sensor 26 is used to detect whether the wrist is at the level of the heart. Specifically, the acceleration sensor 26 is a biaxial (X-axis and Y-axis) acceleration sensor, and the electronic sphygmomanometer 1 is in the X-axis and Y-axis directions by the acceleration sensor 26 as shown in FIG. The inclination of the arm worn is detected based on the detected angle signal. Detection angle (angle φ, angle o) detected by the acceleration sensor 26 in the pitch direction of the forearm as shown in FIG. 9B and the roll direction shown in FIG. 9C of the electronic sphygmomanometer 1 attached to the arm, and The height of the cuff 20 and the heart is calculated using information on the arm length of the measurement subject input from the operation unit 41. The details of the height guide function are described in detail in Japanese Patent No. 3972144 by the applicant of the present application, and the description thereof is omitted here.

  In the present embodiment, the acceleration sensor 26 detects the angles in the pitch direction and the roll direction, and detects whether the wrist with the cuff 20 is moving, that is, whether there is body movement, based on the detected angle. .

  FIG. 11 shows a functional configuration of the electronic sphygmomanometer 1 according to the present embodiment. Referring to FIG. 11, the CPU 100 includes a pressure adjustment unit 101, a blood pressure calculation unit 102, a wear detection unit 103, a data collection control unit 104, a height detection unit 105 for a height guide function, a notification unit 106, and a state. A determination unit 107 is provided.

  The pressure adjustment unit 101 controls the pump 51 and the valve 52 via the pump drive circuit 53 and the valve drive circuit 54, and adjusts the cuff pressure by flowing air into and out of the air bag 21 via the air tube 31. To do. The pump 51 supplies air to the air bladder 21 in order to increase the cuff pressure. The valve 52 is opened and closed to exhaust or seal the air in the air bladder 21. The pump drive circuit 53 controls the drive of the pump 51 based on a control signal given from the CPU 100. The valve drive circuit 54 performs opening / closing control of the valve 52 based on a control signal given from the CPU 100.

  The pressure sensor 32 is a capacitance-type pressure sensor for detecting the pressure (referred to as cuff pressure) in the cuff 20 that is a blood pressure measurement bag, and the capacitance value changes due to the cuff pressure. The oscillation circuit 33 outputs an oscillation frequency signal corresponding to the capacitance value of the pressure sensor 32 to the CPU 100. The CPU 100 detects a pressure by converting a signal obtained from the oscillation circuit 33 into a pressure.

  Based on the pulse pressure signal input from the oscillation circuit 33, the blood pressure calculation unit 102 calculates (estimates) the maximum blood pressure and the minimum blood pressure (systolic blood pressure and diastolic blood pressure), for example, according to the oscillometric method, and detects it per predetermined time. The pulse rate is calculated based on the pulse pressure signal. Specifically, in the process of gradually increasing (or depressurizing) the cuff pressure to a predetermined value by the pressure adjustment unit 101, based on the pressure detection signal from the oscillation circuit 33, the maximum blood pressure and the minimum blood pressure of the measurement subject are determined. calculate. Conventionally known methods can be applied to the calculation of blood pressure and pulse by the blood pressure calculation unit 102.

  The mounting detection unit 103 detects whether the main body unit 10 is mounted integrally with the cuff 20 based on the detection signal from the main body side mounting detection switch 46 described in FIG. 7 or FIG. The detection result is given to the data collection control unit 104. The data collection control unit 104 outputs a signal for controlling data collection to the cuff 20 side via the I / F 47 in accordance with the signal given from the mounting detection unit 103.

  The height detection unit 105 performs the above-described height guide function processing based on the detection signal input from the acceleration sensor 26 of the cuff 20 via the I / F 47 and displays the processing result via the notification unit 106. Displayed on the unit 40.

  The state determination unit 107 is based on a signal input from the cuff 20 via the I / F 47, and calculates the time elapsed from the blood pressure measurement, the bedtime / wakeup time calculation unit 111 that calculates the bedtime / wakeup time of the measurement subject. A time calculation unit 112, an elapsed time calculation unit 113 that calculates the elapsed time since the measurement subject wakes up, and a sleep time calculation unit 114 that calculates the sleep time of the measurement subject. When calculating the time in each of these units, time data input from the timer 45 is used.

  The time correction guide unit 108 has a function of urging the subject to reset the time of the timer 45 to the correct time.

  In FIG. 11, as for peripheral circuits of the CPU 100, only a portion that directly inputs and outputs with the CPU 100 is shown.

  FIG. 12 shows a data storage example of the memory unit 42 according to the present embodiment. The memory unit 42 includes regions E1 and E2. In the area E1, blood pressure measurement result data by the blood pressure calculation unit 102 is stored in record R units. In the record R, a field FE1 for storing the measured maximum blood pressure (systolic blood pressure) data 431, a field FE2 for storing the measured minimum blood pressure (diastolic blood pressure) 432, and data 433 of the detected pulse rate. For storing the field FE3 for storing the data, the field FE4 for storing the data 434 indicating the time of blood pressure measurement based on the time measurement data given from the timer 45, and the data 435 for either flag F1 or F2 Includes field FE5.

  The blood pressure calculation unit 102 sets the pointer 421 in association with the measurement data stored in the memory unit 42. The pointer 421 points to the latest measurement data record R stored by the blood pressure calculation unit 102. Here, the latest measurement data is data in which the time indicated by the associated data 434 indicates the latest time.

  Here, the measurement result data is stored in units of records. However, the measurement result data is not limited to the record format as long as the data 431 to 435 are stored in association with each other.

  Moreover, the data of sleep time TM mentioned later may be linked | related with the record R, and may be stored. Thereby, if the data of the record R memorize | stored in the memory part 42 are read and displayed on the display part 40, a to-be-measured person will be the blood pressure measurement data of the said record R is data when sufficient sleep was obtained. Whether or not can be determined based on the sleep time TM displayed at the same time, the reliability of the measurement data can be determined.

  FIG. 13 shows an example of output signals from the temperature sensor 27 and the acceleration sensor 26 according to the present embodiment. With reference to FIG. 13, a procedure for detecting the sleep time of the person to be measured based on the output signal L1 of the temperature sensor 27 and the output signal L2 of the acceleration sensor 26 will be described.

  In FIG. 13, the vertical axis represents the output level (output voltage) of the output signal L1 of the temperature sensor 27 and the output signal L2 of the acceleration sensor 26, and the horizontal axis represents the passage of time based on the time measured by the timer 45. Is shown. In FIG. 13, a time TR1 indicating the timing when the main body 10 is removed from the cuff 20 and a time TR2 indicating the timing when the main body 10 is mounted on the cuff 20 are shown.

  In the present embodiment, when the person to be measured goes to bed, the main body 10 is removed from the cuff 20 and only the cuff 20 is wound around the wrist that is the measurement site. Then go to sleep. The time TR1 is detected based on the time data input from the timer 45 when the main body 10 is removed at the time of going to bed. Thereafter, when the person to be measured wakes up from sleep and gets up, he attaches the removed main body 10 to the cuff 20 wound around the wrist. The time TR2 is detected based on the time data input from the timer 45 when the main body 10 is mounted at the time of getting up.

  The attachment / detachment of the main body 10 with respect to the cuff 20 is detected by the attachment detection unit 103 based on the detection signal of the main body side detection switch 46. The mounting detection unit 103 stores a value (ON or OFF) indicated by a detection signal input from the main body side mounting detection switch 46, and compares and compares the input detection signal value with the stored value. Based on the result, it is detected whether it is attached or removed. The detection signal is output to the state determination unit 107 and the data collection control unit 104.

  In the present embodiment, the sleep time TM in which the measurement subject is in a sleep state is measured between times TR1 and TR2. In general, it is known that when a human falls asleep, the body temperature rapidly decreases and rises when he wakes up. Therefore, it is estimated (detected) that the patient is in a sleep state in a period in which the signal waveform of the output signal L1 of the temperature sensor 27 that measures the body temperature indicates a V shape. Further, it is known that the body movement of the person to be measured approximately stops in the sleep state. Accordingly, it is estimated (detected) that the output signal L2 of the acceleration sensor 26 is in a sleep state in a period in which the amplitude converges between the constant amplitude AM. The constant amplitude AM can be obtained based on data sampled in advance from many subjects through experiments.

  The signal levels of the output signals L1 and L2 are input as data, and stored in a predetermined storage area of the memory unit 42 in association with the timing data input from the timer 45, whereby the data collection of the output signals L1 and L2 is performed. As a result of this data collection, waveforms as shown in FIG. 13 are plotted in the predetermined storage area of the memory unit 42.

  During the period in which the measurement subject is in the sleep state, the waveform data of the output signal L1 stored in the predetermined storage area of the memory unit 42 is analyzed by differentiation processing or the like, and a period for designating the V-shaped waveform is obtained based on the analysis result. . Similarly, the waveform of the output signal L2 is analyzed to obtain a period in which the amplitude converges between the constant amplitudes AM, a period in which both of the obtained periods overlap is detected, and based on the detected period, FIG. Thus, the sleep time TM of the person to be measured can be detected.

  FIG. 14 shows a flowchart of processing in consideration of the sleep time of the measurement subject according to the present embodiment. This flowchart is stored in advance as a program in a predetermined storage area of the memory unit 42 and a predetermined storage area of the memory unit 23, and the CPU 100 receives the instructions of the program from the memory unit 42 and the CPU 24 transmits the instructions from the memory unit 23. Processing is realized by reading and executing the code.

  Here, it is assumed in advance that the electronic sphygmomanometer 1 is attached to the measurement site (wrist) of the measurement subject as shown in FIG.

  In a state where the electronic sphygmomanometer 1 is worn on the wrist, the CPU 100 determines whether or not the power switch 41A of the operation unit 41 has been turned off. If it is determined that the power-off operation has been performed (YES in step S3), the series of processing ends. On the other hand, if it is determined that the power OFF operation has not been performed, that is, the power ON operation has been performed (NO in step S3), a blood pressure measurement process (step S5) is performed. This blood pressure measurement process will be described later with reference to FIG.

  Here, the start of blood pressure measurement is performed by operating the power switch 41A, but may be instructed by operating the measurement switch 41B.

  When the blood pressure measurement process in step S5 is completed, blood pressure data (maximum blood pressure and minimum blood pressure) calculated (measured) by the blood pressure calculation unit 102 and heart rate data are stored in record R units in the region E1 of the memory unit 42. . The blood pressure calculation unit 102 indicates the stored record R with the pointer 421. In this record R, fields FE1, FE2, and FE3 store measured systolic blood pressure data 431, diastolic blood pressure data 432, and detected heart rate data 433, respectively. In the field FE4, time data 434 based on the time data input from the timer 45 is stored. At this time, the value of the field FE5 is still undefined, and for example, an initial value “0” is set.

  After storing the measurement data, the elapsed time calculation unit 112 from the measurement starts counting the elapsed time T1 based on the time measurement data from the timer 45 (step S9). The elapsed time T1 is data for measuring time in the period from blood pressure measurement to bedtime (time TR1).

  Thereafter, the attachment detection unit 103 determines whether or not the main body 10 has been removed from the cuff 20 based on the detection signal output from the main body side attachment detection switch 46 (step S11). While the removal is not detected, the process returns to step S3.

  On the other hand, when it is detected that the main body 10 is removed from the cuff 20 (YES in step S11), that is, when the time TR1 is detected, the attachment detection unit 103 uses a signal based on this detection signal as a data The data is output to the collection control unit 104.

  The data collection control unit 104 transmits a data collection start instruction signal to the cuff 20 side via the I / F 47 according to the input signal. When the CPU 24 of the cuff 20 receives the data collection start instruction signal via the I / F 25, it records (inputs) the output signals L1 and L2 of the acceleration sensor 26 and the temperature sensor 27, and starts collecting the data indicated by the signal. (Step S13). There is a timer (not shown) inside the CPU 24, and data collection of the time series output signals L1 and L2 can be performed based on the timing data of this timer. The collected data is stored in the memory unit 23 by the CPU 24.

  Note that the CPU 100 and the CPU 24 periodically communicate with each other. This communication periodically synchronizes the timing operation of the internal timer of the CPU 24 and the timer 45, so that the two timers operate to indicate the same timing time.

  Simultaneously with starting the data collection of the output signals L1 and L2, the elapsed time calculation unit 112 from the measurement stops counting the elapsed time T1, and instead of the timer 45 of the elapsed time T2 by the bedtime / wakeup time calculation unit 111. Counting is started based on the time measurement data (steps S15 and S17). The elapsed time T2 is data for measuring time in a period from bedtime (time TR1) to wakeup (time TR2), that is, a data collection period.

  Thereafter, the attachment detection unit 103 detects whether or not the main body unit 10 is attached to the cuff 20 based on the detection output of the main body side detection switch 46 (step S19). If the attachment is not detected, the process returns to step S17, and the detection signals are collected by the acceleration sensor 26 and the temperature sensor 27 and stored in the memory unit 23.

  On the other hand, when it is detected that the main body unit 10 is mounted on the cuff 20 (YES in step S19), that is, when the time TR2 is detected, the mounting detection unit 103 outputs a detection signal to the data collection control unit 104. Therefore, the data collection control unit 104 transmits a data collection stop signal to the cuff 20 side via the I / F 47.

  When the CPU 24 of the cuff 20 inputs the data collection stop signal via the I / F 25, the CPU 24 of the cuff 20 stops collecting the detection signal data by the acceleration sensor 26 and the temperature sensor 27 (step S21). Simultaneously with the stop of data collection of the output signals L1 and L2, the sleeping / wake-up time calculation unit 111 stops counting the elapsed time T2, and instead, the elapsed time calculation unit 113 from the wake-up calculates the timing data of the timer 45. Based on this, the elapsed time T3 starts to be counted (steps S23 and S25). The elapsed time T3 is data for measuring the elapsed time since the main body 10 is mounted on the cuff 20, that is, the elapsed time from the time of getting up (time TR2).

  Thereafter, the sleep time calculation unit 114 of the CPU 100 performs sleep time based on the data described in FIG. 13 based on the data of the output signals L1 and L2 read from the memory unit 23 by the CPU 24 of the substrate 22 via the I / F 47. TM is calculated (step S27).

  Then, the CPU 100 compares the sleep time TM with the predetermined time, and detects whether there is a sleep time exceeding the predetermined time based on the comparison result (step S29). If it is detected that the sleeping time TM exceeds the predetermined time (YES in step S29), the process proceeds to the next step S31. If it is determined that the sleeping time TM is equal to or shorter than the predetermined time (NO in step S29). ), The process returns to step S3.

  In step S31, the CPU 100 calculates how many hours ago it fell asleep based on the elapsed times T1, T2, and T3.

  In step S33, the CPU 100 compares the time of the data 434 of the record R indicated by the pointer 421 with the sleep time calculated in step S31, and detects the difference. When the difference time is compared with a predetermined threshold value (TH1) and it is determined that the difference time ≧ TH1, the process proceeds to step S39 described later. If it is determined that the difference time <TH1, the most recent measurement result is determined to be the blood pressure measurement result immediately after going to bed (step S35). Therefore, the flag F1 indicating that the blood pressure measurement result is immediately after going to bed is set in the field FE5 of the record R indicated by the pointer 42 (step S37). Thereafter, the process proceeds to step S39.

  In step S39, based on the elapsed time T3, it is determined whether or not blood pressure measurement has been performed within, for example, 30 minutes after the body portion 10 is attached to the cuff 20. This determination is made by updating the record indicated by the pointer 421. It is detected by whether or not. If it is not determined that the blood pressure measurement after waking up has been performed within a predetermined time (30 minutes in the present embodiment) after waking up (NO in step S39), the process returns to step S3.

  On the other hand, if it is determined that blood pressure measurement has been performed within 3 hours after mounting the main body 10 on the cuff 20 (YES in step S39), in the next step S41, the CPU 100 determines the elapsed time after the cuff is mounted. The count of T3 is stopped (step S41). Thereafter, the elapsed time after waking up is calculated based on the value of the elapsed time T3 when the counting operation is stopped (step S43).

  The calculated elapsed time after getting up is compared with the measurement time of the data 434 indicated by the latest blood pressure measurement result of the record R indicated by the pointer 421 stored in the memory unit 42, and the difference is obtained. If the difference time is greater than or equal to TH2, the process proceeds to step S3. If it is determined that the difference time <TH2, the most recent measurement result is determined to be the blood pressure measurement result immediately after getting up (step S47).

  In step S47, the record R indicated by the pointer 421 stored in the memory unit 42 is determined to indicate the result of blood pressure measurement immediately after getting up, and the field FE5 of the record R indicated by the pointer 421 is set in the wake-up. A flag F2 indicating that the blood pressure measurement result is immediately after is set (step S49). Thereafter, the process returns to step S3.

  Although the data collection start / stop signal for the CPU 24 is given from the data collection control unit 104 here, the present invention is not limited to this. That is, the CPU 24 may input a detection signal for mounting / removal of the main body 10 by the cuff-side mounting detection switch 29 and start / stop data collection based on the input signal.

  In the present embodiment, the acceleration sensor 26 and the temperature sensor 27 are provided in the cuff 20 from which the main body 10 of the wrist electronic sphygmomanometer 1 can be removed, but the present invention is not limited to the wrist sphygmomanometer. For example, the following configuration may be used. That is, at the time of going to bed, a wristband-like shape separate from the cuff of the electronic blood pressure monitor is worn on the wrist. A substrate 22 provided with an acceleration sensor 26 and a temperature sensor 27 is provided inside the wristband. Data collected by the circuit of the substrate 22 at bedtime may be transmitted to the electronic sphygmomanometer wirelessly.

(Blood pressure measurement process)
FIG. 15 shows a blood pressure measurement processing procedure according to the present embodiment. This processing procedure follows a known blood pressure measurement process.

  The processing shown in the flowchart of FIG. 15 is stored in advance in the memory unit 42 as a program, and the blood pressure measurement processing function is realized by the CPU 100 reading and executing this program.

  Referring to FIG. 15, CPU 100 executes a predetermined initialization process for blood pressure measurement (step S102).

  Next, the pressure adjustment unit 101 of the CPU 100 executes a pressurizing process for the cuff 20 (step S104). In the present embodiment, the CPU 100 detects the cuff pressure based on the output from the oscillation circuit 33, and determines whether or not the cuff pressure has reached a predetermined value (for example, 180 mmHg). Until the CPU 100 detects that the cuff pressure reaches a predetermined value, the pressure adjusting unit 101 performs the pressurizing process.

  When the CPU 100 determines that the cuff pressure has reached a predetermined value, the pressure adjustment unit 101 ends the pressurization process, and controls the pump drive circuit 53 and the valve drive circuit 54 so that the air is gradually exhausted. To do. Thereby, the cuff pressure is gradually reduced (step S106).

  Next, the blood pressure calculation unit 102 calculates blood pressure (maximum blood pressure, minimum blood pressure) by a known method (step S108). Specifically, in the process of gradually reducing the cuff pressure, the blood pressure calculation unit 102 extracts pulse wave information based on the oscillation frequency obtained from the oscillation circuit 33. Then, the blood pressure is calculated from the extracted pulse wave information. The blood pressure calculation unit 102 also calculates the pulse rate by a known method.

(Measure blood pressure when waking up)
The value of the elapsed time T3 after waking up may be displayed on the display unit 40 to prompt the person to be measured to perform blood pressure measurement when waking up. In this case, measurement data for early morning hypertension determination can be obtained with certainty.

(Processed by the time correction guide unit 108)
The time correction guide unit 108 is the bedtime / wake-up time pointed to by the times TR1 and TR2 detected in the measurement subject's life rhythm, and time data (for example, bedtime 24:00, wake-up 6 hours) set in the memory unit 42 in advance. Compare As a result of the comparison, if the difference exceeds a predetermined value, it is estimated (detected) that the time of the timer 45 is not accurate, and the time of the timer 45 is set correctly on the display unit 40 via the notification unit 106. A message prompting 'is output. The timer 45 can be expected to be timed by the measurement subject who has confirmed this message.

(Measurement result reading process)
The measurement data of the record R stored in the memory unit 42 is read from the memory unit 42 by the CPU 100 and displayed on the display unit 40 when the memory switch 41D of the operation unit 41 is operated. At this time, information based on the flag F1 or F2 is also displayed together with the blood pressure measurement data, so the blood pressure data displayed together with the information of the flag F1 is data immediately after going to bed and may be reference data for determining nocturnal hypertension. Instructed. In addition, the blood pressure data displayed together with the information of the flag F2 is instructed to be data immediately after getting up and reference data for determining early morning hypertension.

  The measurement data of the record R in the memory unit 42 may be read out, transmitted to a medical institution terminal, and displayed. In addition, when the area for storing the record R in the memory unit 42 is composed of a removable storage medium, the storage medium may be removed, brought to a medical institution, and diagnosed based on the contents of the storage medium. Is possible.

(Effects of the embodiment)
The acceleration sensor 26 and the temperature sensor 27 are built in the cuff 20 of the wrist-type electronic sphygmomanometer 1, and after removing the main body 10 from the cuff 20 during sleep, only the cuff 20 is attached to the wrist. And based on the result of the detection of the body movement by the acceleration sensor 26 and the detection of the body temperature by the temperature sensor 27, the sleep and awakening of the measurement subject are measured.

  Therefore, since it is possible to accurately determine before sleep and after getting up, not the concept of time, the reliability of the measurement time of the blood pressure measurement result is improved. Therefore, the tendency of early morning hypertension and nocturnal hypertension can be found.

  Since the measurement subject can measure the wake-up time and the sleep time without the trouble of setting the clock, the convenience for the user is improved.

  Further, there is no need for an expensive and large system such as an electroencephalogram or respiration measurement, and it can be realized by an inexpensive and small acceleration sensor 26 and temperature sensor 27.

  In addition, when trying to measure sleep and measuring brain waves, breathing, etc., it is generally a burden on the user because the sensor device is attached to the head or face of the person being measured. In this embodiment, the acceleration sensor 26 and the temperature sensor 27 need only be attached to the wrist like a wristband, so that the burden on the user is small.

  Since the sleep time can be measured as the measurement state of the measurement subject, the reliability of the blood pressure measurement result can be improved.

  When the life (wake-up and sleep) rhythm and the internal set time are significantly different, the user can be notified to prompt correction.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the external appearance of the wrist-type electronic blood pressure meter which concerns on this Embodiment. It is a figure explaining the air system of the electronic blood pressure monitor which concerns on this Embodiment. It is a hardware block diagram of the wrist type electronic blood pressure monitor which concerns on this Embodiment. It is a figure explaining the structure for detachably locking a main-body part to the cuff which concerns on this Embodiment. It is a figure explaining the structure for detachably locking a main-body part to the cuff which concerns on this Embodiment. It is a figure explaining the structure for detachably locking a main-body part to the cuff which concerns on this Embodiment. (A)-(C) is a figure explaining an example of the detection mechanism whether the main-body part which concerns on this Embodiment is mounted | worn. It is a figure explaining the other example of the detection mechanism whether the main-body part which concerns on this Embodiment is mounted | worn. It is a figure explaining the acceleration sensor which concerns on this Embodiment. It is a figure explaining the acceleration sensor which concerns on this Embodiment. It is a functional lineblock diagram of the electronic sphygmomanometer concerning this embodiment. It is a figure which shows the example of data storage of the memory part which concerns on this Embodiment. It is a figure which shows an example of the output signal of the temperature sensor and acceleration sensor which concern on this Embodiment. It is a flowchart of the measurement process which considered the sleep time which concerns on this Embodiment. It is a flowchart of the blood-pressure measurement process which concerns on this Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 Pressure adjustment part, 102 Blood pressure calculation part, 103 Wearing detection part, 104 Data collection control part, 105 Height detection part, 106 Notification part, 107 State judgment part, 111 Sleeping / wake-up time calculation part, 112 Elapsed time from measurement Calculation unit, 113 Elapsed time calculation unit from rising, 114 Sleep time calculation unit, 108 Time correction guide unit.

Claims (6)

An electronic sphygmomanometer that measures a subject's blood pressure,
A winding member including a memory unit and wound around a wrist of a living body;
A measurement unit for measuring blood pressure;
Analyzing the data in the memory unit, based on the analysis result, a period detection unit that detects a sleep period,
A measurement bag wound around the measurement site of the living body and inflated by supplying a fluid during measurement;
A control unit for performing blood pressure measurement by the measurement unit before and after the sleep period detected by the period detection unit,
The measuring unit is
A pressure sensor for measuring the internal pressure of the measurement bag during measurement;
A blood pressure calculator that calculates blood pressure based on the internal pressure measured by the pressure sensor,
The winding member is
An acceleration sensor for detecting body movement;
A temperature sensor for detecting body temperature;
An electronic sphygmomanometer, further comprising: a data collection unit that inputs detection signals of the acceleration sensor and the temperature sensor, and stores data of the detection signal in the memory unit in time series of input.   The period detection unit analyzes the detection signal levels of the acceleration sensor and the temperature sensor indicated by data in the memory unit based on a predetermined condition for determining the sleep period, and detects the sleep period. Item 2. The electronic blood pressure monitor according to Item 1.   The electronic sphygmomanometer according to claim 1, further comprising a readable blood pressure storage unit that stores the blood pressure calculated by the blood pressure calculation unit in association with measurement time data. The winding member is replaced with the measurement bag,
The electronic blood pressure monitor according to claim 1, wherein the measurement unit is detachably attached to the measurement bag.   The electronic sphygmomanometer according to claim 1, which outputs an elapsed time after the sleep period. A timer that measures the current time is further provided.
The electronic sphygmomanometer according to claim 1, wherein a message prompting the setting of the timer is output according to a difference between a time for instructing the sleep period and a preset time.

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