WO2021090811A1 - 血圧計、血圧算出方法、およびプログラム - Google Patents

血圧計、血圧算出方法、およびプログラム Download PDF

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Publication number
WO2021090811A1
WO2021090811A1 PCT/JP2020/041106 JP2020041106W WO2021090811A1 WO 2021090811 A1 WO2021090811 A1 WO 2021090811A1 JP 2020041106 W JP2020041106 W JP 2020041106W WO 2021090811 A1 WO2021090811 A1 WO 2021090811A1
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Prior art keywords
blood pressure
wrist
pressure measurement
cuff
sphygmomanometer
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PCT/JP2020/041106
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English (en)
French (fr)
Japanese (ja)
Inventor
幸哉 澤野井
新吾 山下
美佳 江副
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オムロンヘルスケア株式会社
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Publication of WO2021090811A1 publication Critical patent/WO2021090811A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Definitions

  • the present invention relates to a sphygmomanometer, and more particularly to a sphygmomanometer having a nighttime (sleeping) blood pressure measurement mode.
  • the present invention also relates to a blood pressure calculation method for calculating blood pressure by such a sphygmomanometer.
  • the present invention also relates to a program for causing a computer to execute such a blood pressure calculation method.
  • a sphygmomanometer for measuring nighttime blood pressure
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2018-075447
  • a sphygmomanometer is integrally attached to an arm (upper arm) as a measurement site, and is a subject.
  • the posture is specified by the angle of the trunk with respect to the floor surface and the position of the arm according to the angle of the trunk when the subject sleeping on the floor surface is viewed along the height direction. It is disclosed that the calculated blood pressure value of the subject is corrected according to the identified posture.
  • the wrist (left wrist in this example) 90 has a degree of freedom of rotation around the wrist 90 in the longitudinal direction.
  • the palm side surface (palm side surface) 90a is sideways (direction facing the trunk) and upward.
  • Can take three downward postures hereinafter referred to as "wrist rotation posture").
  • ENV-h, ENV-u, and ENV-d are displaced from each other in the horizontal axis (cuff pressure) direction (in the example of FIG. 14, the maximum of each envelope ENV-h, ENV-u, ENV-d).
  • the amplitude value is normalized to 1). Therefore, when the blood pressure is calculated simply by a known algorithm (that is, as shown in FIG. 14, the cuff at the time when the envelopes ENV-h, ENV-u, and ENV-d cross a certain error level THS.
  • the pressure is calculated as blood pressure values SBP-h, SBP-u, SBP-d), for example, as shown in the box whiskers diagram of FIG. 13 (A), a blood pressure measurement error occurs depending on the rotational posture of the wrist 90.
  • this blood pressure measurement error is defined as an error with respect to the blood pressure value measured by auscultation with the upper arm of the subject 80 in the recumbent position as the measurement site.
  • FIG. 13 (A) shows SBP (Systolic Blood Pressure) and DBP (Diastolic Blood Pressure) when the wrists are rotated sideways (facing the trunk), upwards, and downwards.
  • Blood pressure measurement error (data for 40 people x 3 times) is represented by a box with diagonal lines, a box with white lines, a box with vertical lines, and a "beard" extending vertically from each box. ing.
  • FIG. 13 (A) as described in FIG.
  • the sphygmomanometer of this disclosure is A sphygmomanometer that calculates blood pressure by the oscillometric method by temporarily pressing the wrist as the subject's measurement site with a blood pressure measurement cuff. It has a nighttime blood pressure measurement mode that automatically starts blood pressure measurement according to a predetermined schedule.
  • a rotational posture detection unit that includes an acceleration sensor integrally provided with the blood pressure measurement cuff and detects the rotational posture of the wrist to which the blood pressure measurement cuff is attached based on the output of the acceleration sensor.
  • the blood pressure measurement error according to the detected rotation posture of the wrist is calculated based on the pressure of the blood pressure measurement cuff. It is characterized by having a blood pressure acquisition unit that calculates a blood pressure value so as to suppress it.
  • the "accelerometer integrally provided with the blood pressure measurement cuff" is not limited to the case where the acceleration sensor is directly mounted on the blood pressure measurement cuff, and the acceleration sensor is mounted on, for example, the main body described later. , Including the case where it is integrated with the blood pressure measurement cuff via the main body.
  • the “rotational posture of the wrist” refers to a posture in which the palm side surface (the side surface on the palm side) of the wrist is turned sideways (facing the trunk), upward, or downward due to the rotation of the wrist, for example.
  • the "blood pressure measurement error” according to the rotational posture of the wrist is defined as an error with respect to the reference blood pressure value (for example, the blood pressure value measured by auscultation with the human upper arm in the supine position as the measurement site).
  • the rotation posture detection unit detects the rotation posture of the wrist equipped with the blood pressure measurement cuff based on the output of the accelerometer.
  • the blood pressure acquisition unit responds to the detected rotation posture of the wrist based on the pressure of the blood pressure measurement cuff when the blood pressure measurement cuff is in the pressurizing process or the depressurizing process.
  • the blood pressure value is calculated so as to suppress the blood pressure measurement error. Therefore, according to this sphygmomanometer, the blood pressure can be calculated accurately according to the rotational posture of the wrist as the measurement site.
  • this sphygmomanometer is a type that presses the wrist as the measurement site, it is expected that the degree of disturbing the subject's sleep is less than that of the type that presses the upper arm (Imai et al., “Development and evaluation of a home nocturnal blood pressure monitoring system using a wrist-cuff device”, Blood Pressure Monitoring 2018, 23, P318-326). Therefore, this sphygmomanometer is suitable for nighttime (sleeping) blood pressure measurement.
  • the blood pressure measuring cuff when a human wrist in the supine position is temporarily pressed by the blood pressure measuring cuff and the blood pressure is calculated using the algorithm by the oscillometric method based on the pressure of the blood pressure measuring cuff.
  • An error storage unit that stores blood pressure measurement errors according to the rotational posture of a human wrist in advance is further provided.
  • the above blood pressure acquisition department In the nocturnal blood pressure measurement mode, when the blood pressure measurement cuff is in the pressurizing process or the depressurizing process, the blood pressure value of the subject is measured using the above algorithm by the above oscillometric method based on the pressure of the above blood pressure measurement cuff.
  • the first blood pressure calculation unit to calculate and It is characterized by including an error correction unit that corrects the calculated blood pressure value by the amount of the blood pressure measurement error according to the detected rotation posture of the wrist with reference to the error storage unit.
  • Human refers to a general person and may be multiple people. In that case, a person other than the “subject” may be included. Moreover, the “human” may be the same person as the "subject”.
  • the “algorithm by the oscillometric method” is to set an envelope for a sequence of pulse wave amplitudes obtained from the cuff pressure when the blood pressure measurement cuff is in a pressurization process or a decompression process, and to set an envelope of the envelope.
  • a predetermined ratio of thresholds to the maximum value is set, and the cuff pressure at the time when the envelope crosses those thresholds.
  • Remembering the blood pressure measurement error in advance means that the blood pressure measurement error is typically memorized at the stage before the sale of the sphygmomanometer prior to the blood pressure measurement.
  • the error storage unit temporarily presses the human wrist in the supine position with the blood pressure measuring cuff, and based on the pressure of the blood pressure measuring cuff, the oscilometric method is used.
  • the blood pressure measurement error according to the rotational posture of the human wrist when the blood pressure is calculated using the algorithm is stored in advance.
  • the first blood pressure calculation unit of the blood pressure acquisition unit is an oscillometric method based on the pressure of the blood pressure measurement cuff when the blood pressure measurement cuff is in the pressurization process or the depressurization process in the nocturnal blood pressure measurement mode.
  • the blood pressure value of the subject is calculated using the above algorithm according to.
  • the error correction unit corrects the calculated blood pressure value by the amount of the blood pressure measurement error according to the detected rotation posture of the wrist with reference to the error storage unit. That is, the once calculated blood pressure value is corrected by the amount of the blood pressure measurement error according to the detected rotation posture of the wrist. As a result, the blood pressure measurement error according to the rotational posture of the wrist can be suppressed. Therefore, the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated accurately.
  • the algorithm is a specific algorithm defined to suppress the blood pressure measurement error when the wrist of the human in the supine position is in a specific rotational posture.
  • the error storage unit calculates the blood pressure measurement error according to another rotational posture different from the specific rotational posture of the human wrist when the blood pressure is calculated by using the specific algorithm by the oscillometric method.
  • the first blood pressure calculation unit calculates the blood pressure value of the subject by using the specific algorithm regardless of the rotation posture of the wrist.
  • the error correction unit refers to the error storage unit and uses the calculated blood pressure value to obtain the other rotational posture of the wrist. It is characterized in that the correction is made by the amount of the blood pressure measurement error according to the above.
  • the “specific rotational posture” is a rotational posture in which the palm side surface (the surface on the palm side) is sideways (the direction facing the trunk)
  • the “other rotational posture” is, for example, the palm side surface. Refers to a rotational posture that is upward or downward.
  • the algorithm is a specific algorithm defined to suppress the blood pressure measurement error when the wrist of the human in the supine position is in a specific rotational posture.
  • the error storage unit calculates the blood pressure measurement error according to another rotational posture different from the specific rotational posture of the human wrist when the blood pressure is calculated by using the specific algorithm by the oscillometric method. , I remember in advance.
  • the first blood pressure calculation unit calculates the blood pressure value of the subject by using the specific algorithm regardless of the rotational posture of the wrist. Only when the wrist of the subject is in the other rotational posture of the subject, the error correction unit refers to the error storage unit and uses the calculated blood pressure value to obtain the other rotational posture of the wrist.
  • the blood pressure measurement error is corrected according to the above. That is, the error correction unit corrects the blood pressure value calculated by using the specific algorithm when the wrist of the subject is in the specific rotational posture in the nighttime blood pressure measurement mode. No need. Therefore, the process of calculating blood pressure becomes simple.
  • a candidate algorithm storage unit that stores in advance a plurality of candidate algorithms defined to suppress the blood pressure measurement error according to the rotation posture of the wrist is further provided.
  • the above blood pressure acquisition department In the nighttime blood pressure measurement mode, an algorithm switching unit that selects and sets an algorithm according to the detected rotation posture of the wrist from among the plurality of candidate algorithms.
  • the blood pressure value In the nocturnal blood pressure measurement mode, when the blood pressure measurement cuff is in the pressurization process or the depressurization process, the blood pressure value is calculated using the currently set algorithm based on the pressure of the blood pressure measurement cuff. 2 It is characterized by including a blood pressure calculation unit.
  • Multiple candidate algorithms according to the wrist rotation posture typically means that the thresholds of a predetermined ratio to the maximum value of the envelope are set to each other according to the wrist rotation posture. Refers to an algorithm specified by a different value.
  • Remembering a plurality of candidate algorithms in advance means that they are typically memorized at the stage before the sale of the sphygmomanometer prior to the blood pressure measurement.
  • the candidate algorithm storage unit stores in advance, as the above-mentioned algorithm, a plurality of candidate algorithms defined so as to suppress the above-mentioned blood pressure measurement error according to the above-mentioned rotational posture of the wrist. ing.
  • the algorithm switching unit of the blood pressure acquisition unit selects and sets an algorithm corresponding to the detected rotation posture of the wrist from among the plurality of candidate algorithms in the nighttime blood pressure measurement mode.
  • the second blood pressure calculation unit is an algorithm currently set (that is, based on the pressure of the blood pressure measuring cuff when the blood pressure measuring cuff is in the pressurizing process or the depressurizing process in the nighttime blood pressure measuring mode.
  • the blood pressure value is calculated using the detected algorithm according to the rotational posture of the wrist). Therefore, it is possible to suppress the occurrence of blood pressure measurement error according to the rotational posture of the wrist. Therefore, the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated accurately.
  • the main body includes the rotational posture detection unit including the acceleration sensor, the pressure control unit that controls the pressure of the blood pressure measurement cuff, and the blood pressure acquisition unit. It is characterized by that.
  • the "body” is typically placed at a specific site in the longitudinal direction of the band-shaped blood pressure measurement cuff, for example, a site that is intended to correspond to the palm side surface (palm side surface) of the wrist. Will be done.
  • the "pressure control unit” includes, for example, a pump that supplies a fluid for pressurization to the blood pressure measuring cuff, a valve that exhausts the fluid from the blood pressure measuring cuff, and elements that drive and control these pumps / valves and the like. ..
  • the sphygmomanometer of this embodiment can be integrally and compactly configured as a wrist-type sphygmomanometer. Therefore, the handling by the user becomes convenient. Further, in the sphygmomanometer of this embodiment, the rotational posture detecting unit can easily detect the rotational posture of the wrist according to, for example, the direction of the gravitational acceleration vector relative to the main body.
  • the blood pressure calculation method of this disclosure is This is a blood pressure calculation method for a sphygmomanometer that temporarily presses the wrist as the subject's measurement site with a blood pressure measurement cuff and calculates the blood pressure by the oscillometric method.
  • the above blood pressure monitor It has a nighttime blood pressure measurement mode that automatically starts blood pressure measurement according to a predetermined schedule.
  • the above blood pressure calculation method is When the sphygmomanometer is in the nighttime blood pressure measurement mode, Based on the output of the acceleration sensor, the rotational posture of the wrist to which the blood pressure measuring cuff is attached is detected.
  • the algorithm for calculating the blood pressure by the oscillometric method is used based on the pressure of the blood pressure measuring cuff, and the detected wrist is used.
  • a blood pressure calculation method characterized in that a blood pressure value is calculated so as to suppress a blood pressure measurement error according to a rotating posture.
  • the blood pressure can be calculated accurately according to the rotational posture of the wrist as the measurement site.
  • this disclosed program is a program for causing a computer to execute the above blood pressure calculation method.
  • the above blood pressure calculation method can be implemented by causing a computer to execute this disclosed program.
  • the blood pressure can be accurately calculated according to the rotational posture of the wrist as the measurement site in the nighttime (sleeping) blood pressure measurement mode. Also, according to the program of this disclosure, such a blood pressure calculation method can be executed by a computer.
  • FIG. 8A is a diagram showing the passage of time of the cuff pressure PC accompanying the blood pressure measurement.
  • FIG. 8B is a diagram showing the passage of time of the pulse wave signal SM accompanying the blood pressure measurement.
  • FIG. 8C is a diagram showing an envelope ENV set for a sequence of pulse wave amplitudes formed by the pulse wave signal SM. It is a figure explaining the method of the blood pressure calculation by the said 1st operation flow in the nighttime blood pressure measurement mode. It is a figure which illustrates the error table which recorded the blood pressure measurement error according to the rotational posture of a human wrist. It is a figure which shows the 2nd operation flow at the time of performing the blood pressure measurement in the nighttime blood pressure measurement mode by the said sphygmomanometer. It is a figure explaining the method of the blood pressure calculation by the said 2nd operation flow in the nighttime blood pressure measurement mode.
  • FIG. 13 (A) is a box-and-whisker plot showing a blood pressure measurement error according to the rotational posture of a human wrist.
  • FIG. 13B is a diagram illustrating the meaning represented by the boxplot. It is a figure explaining the method of calculating the blood pressure so that the blood pressure measurement error shown in FIG. 13A occurs.
  • FIG. 1 shows the appearance of the wrist type sphygmomanometer 100 according to the embodiment of the present invention.
  • the sphygmomanometer 100 is roughly divided into a blood pressure measuring cuff 20 to be attached to the left wrist 90 (see FIG. 3 described later) as a measurement site, and a main body 10 integrally attached to the cuff 20. ing.
  • the cuff 20 is a general one for a wrist-type sphygmomanometer, and has an elongated band-like shape so as to surround the left wrist 90 along the circumferential direction.
  • the cuff 20 contains a fluid bag 22 (see FIG. 2) for pressing the left wrist 90.
  • a carla having appropriate flexibility may be provided in the cuff 20.
  • the main body 10 is integrally attached to a portion substantially in the center of the strip-shaped cuff 20 in the longitudinal direction.
  • the portion to which the main body 10 is attached is planned to correspond to the palm side surface (palm side surface) 90a of the left wrist 90 in the mounted state.
  • 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 interfere with the sleep of the user (in this example, the subject; the same applies hereinafter). Further, the corners of the main body 10 are rounded (the corners are rounded).
  • a display 50 forming a display screen and an operation unit 52 for inputting an instruction from the user are input. And are provided.
  • the display 50 is composed of an LCD (Liquid Crystal Display) and displays predetermined information according to a control signal from a CPU (Central Processing Unit) 110 described later.
  • the systolic blood pressure (unit: mmHg), the diastolic blood pressure (unit: mmHg), and the pulse rate (unit: beat / minute) are displayed.
  • the display 50 may consist of an organic EL (ElectroLuminescence) display or may include an LED (Light Emitting Diode).
  • the operation unit 52 inputs an operation signal according to an instruction by the user to the CPU 110 described later.
  • the operation unit 52 includes a measurement switch 52A for receiving a blood pressure measurement instruction by the user and a night measurement switch 52B for receiving an instruction to switch the mode between the normal blood pressure measurement mode and the nighttime blood pressure measurement mode.
  • a check switch 52C for receiving an instruction to display the stored measurement result on the display 50 is included.
  • the "normal blood pressure measurement mode” means a mode in which, when a blood pressure measurement instruction is input by the measurement switch 52A, the blood pressure is measured in response to the blood pressure measurement instruction.
  • the "nighttime blood pressure measurement mode” means a mode 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 a plan for measuring at a fixed time such as 1:00, 2:00, or 3:00 at midnight, or a plan for measuring once every two hours after the night measurement switch 52B is pressed.
  • the measurement switch 52A, the night measurement switch 52B, and the check switch 52C are all momentary type (self-recovery type) switches, and are turned on and released only while being pressed down. And return to the off state.
  • the measurement switch 52A When the measurement switch 52A is pressed down while the sphygmomanometer 100 is in the normal blood pressure measurement mode, it means a blood pressure measurement instruction, and the cuff 20 temporarily presses the area to be measured (left wrist 90). Blood pressure measurements are performed by the metric method.
  • the measurement switch 52A When the measurement switch 52A is pressed down again during blood pressure measurement (for example, while pressurizing the cuff 20), it means an instruction to stop blood pressure measurement, and blood pressure measurement is stopped immediately.
  • the night measurement switch 52B is pressed down while the sphygmomanometer 100 is in the normal blood pressure measurement mode, it means an instruction to shift to the night blood pressure measurement mode, and the sphygmomanometer 100 measures the night blood pressure from the normal blood pressure measurement mode. Move to mode. In the nocturnal blood pressure measurement mode, as described above, blood pressure measurement by the oscillometric method is automatically started according to a predetermined schedule. If the night measurement switch 52B is pressed again while the sphygmomanometer 100 is in the nighttime blood pressure measurement mode, it means an instruction to stop the nighttime blood pressure measurement mode, and the sphygmomanometer 100 shifts from the nighttime blood pressure measurement mode to the normal blood pressure measurement mode. To do.
  • the user may instruct blood pressure measurement by interruption by pressing the measurement switch 52A, in addition to the predetermined schedule.
  • the blood pressure measurement is temporarily performed by the cuff 20 in response to the interrupted blood pressure measurement instruction, and the blood pressure measurement is performed by the oscillometric method.
  • FIG. 2 shows the block configuration of the sphygmomanometer 100.
  • the cuff 20 includes a fluid bag 22 for pressing the left wrist 90 as a measurement site as described above.
  • the fluid bag 22 and the main body 10 are connected by an air pipe 39 so that the fluid can flow.
  • the main body 10 includes a CPU 110 as a control unit, a memory 51 as a storage unit, a power supply unit 53, an acceleration sensor 34, a pressure sensor 31, and a pump. 32 and a valve 33 are mounted. Further, the main body 10 includes an A / D conversion circuit 310 that converts the output of the pressure sensor 31 from an analog signal to a digital signal, a pump drive circuit 320 that drives the pump 32, and a valve drive circuit 330 that drives the valve 33. It is equipped with an A / D conversion circuit 340 that converts the output of the acceleration sensor 34 from an analog signal to a digital signal.
  • the pressure sensor 31, the pump 32, and the valve 33 are commonly connected to the fluid bag 22 through the air pipe 39 so that the fluid can flow.
  • the memory 51 contains a program for controlling the sphygmomanometer 100, data used for controlling the sphygmomanometer 100, setting data for setting various functions of the sphygmomanometer 100, data of blood pressure value measurement results, and pulse. Stores number data and so on. Further, the memory 51 is used as a work memory or the like when a program is executed.
  • the memory 51 stores an algorithm for the sitting position and an algorithm for the supine position as an algorithm for calculating blood pressure by the oscillometric method.
  • the “sitting position” means that a user 80 who wears a sphygmomanometer 100 on his left wrist 90 sits on a chair 97 or the like, puts his left elbow on a table 98, and puts his left wrist 90 on his trunk.
  • by raising it diagonally forward (hands up, elbows down) it means a posture in which the left wrist 90 (and sphygmomanometer 100) is maintained at the height level of the heart 81.
  • This posture is recommended to improve the accuracy of blood pressure measurement because the height difference between the left wrist 90 of the user 80 and the heart 81 can be eliminated.
  • a user 80 wearing a sphygmomanometer 100 on the left wrist 90 is placed on a horizontal floor surface 99 or the like with the left elbow extended along the trunk. It means lying on his back.
  • the height difference ⁇ H between the left wrist 90 (and the sphygmomanometer 100) of the user 80 and the heart 81 occurs (the height of the heart 81 is higher than the height of the left wrist 90), so that the blood pressure measurement value is measured. There will be a gap.
  • the blood pressure measurement value may deviate due to the bending and stretching of the left elbow. There is also sex.
  • a blood pressure calculation algorithm for measuring the blood pressure in the recumbent position is used as opposed to the blood pressure calculation algorithm for measuring the blood pressure in the sitting position. It is desirable to change.
  • the memory 51 is a sitting algorithm (thystole threshold THS1 and diastole algorithm shown in FIG.
  • the threshold level THS1 for the systole and the threshold level THD2 for the diastole are stored.
  • the algorithm for the supine position (the threshold THS2 for the systole and the threshold THD2 for the diastole shown in FIG. 9 described later are used) are stored. .. The specific method of calculating blood pressure using these algorithms will be described later.
  • the memory 51 acts as an error storage unit, and as shown in the error table of FIG. 10, the algorithm for the supine position (threstole level shown in FIG. 9 described later) by the oscillometric method is used.
  • the blood pressure measurement error according to the rotational posture of the human wrist 90 in the supine position when the blood pressure is calculated using THS2 and the threshold level THD2 for diastole is stored in advance. .. Specifically, in the "error average" column in the middle of the error table of FIG. 10, when the rotational posture of the wrist 90 shown in FIG. 13 (A) is sideways (direction facing the trunk), upward, or downward.
  • the average value of blood pressure measurement error (data for 40 people x 3 times) for SBP (Systolic Blood Pressure; systolic blood pressure) and DBP (Diastolic Blood Pressure; diastolic blood pressure) is stored.
  • SBP Sestolic Blood Pressure
  • DBP Diastolic Blood Pressure; diastolic blood pressure
  • -0.75 mmHg is stored as the average value of blood pressure measurement error for SBP when the rotation posture of the wrist 90 is "sideways”
  • -1.19 mmHg is stored as the average value of blood pressure measurement error for DBP. ..
  • the average value of the blood pressure measurement error for SBP is -3.30 mmHg
  • the average value of the blood pressure measurement error for DBP is -3.06 mmHg.
  • -3.55 mmHg is stored as the average value of the blood pressure measurement error for SBP when the rotational posture of the wrist 90 is "downward”
  • -2.84 mmHg is stored as the average value of the blood pressure measurement error for DBP. ..
  • the rotational posture of the wrist 90 corresponds to the blood pressure measurement error for SBP and DBP when the rotational posture of the wrist 90 is "lateral orientation”. Differences in blood pressure measurement errors for SBP and DBP in the cases of "upward” and “downward” are stored, respectively.
  • the blood pressure measurement error (-0.75 mmHg) for the SBP when the rotation posture of the wrist 90 is "sideways” corresponds to the blood pressure measurement error (-0.75 mmHg) for the SBP when the rotation posture of the wrist 90 is "upward”.
  • -2.55 mmHg is stored as a difference of 3.30 mmHg).
  • the blood pressure measurement error (-0.75 mmHg) for the SBP when the rotation posture of the wrist 90 is "sideways” corresponds to the blood pressure measurement error (-0.75 mmHg) for the SBP when the rotation posture of the wrist 90 is "downward”.
  • -2.80 mmHg is stored as a difference of 3.55 mmHg). Similar differences are stored for DBP. How to use this error table will be described later.
  • the CPU 110 shown in FIG. 2 controls the operation of the entire sphygmomanometer 100. Specifically, the CPU 110 acts as a pressure control unit according to a program for controlling the sphygmomanometer 100 stored in the memory 51, and drives the pump 32 and the valve 33 in response to an operation signal from the operation unit 52. Take control. Further, the CPU 110 functions as a blood pressure calculation unit, calculates a blood pressure value using an algorithm for calculating blood pressure by the oscillometric method, and controls the display 50 and the memory 51. The CPU 110 also functions as a rotation posture detection unit, which will be described later.
  • the power supply unit 53 includes a secondary battery, a CPU 110, a pressure sensor 31, a pump 32, a valve 33, an acceleration sensor 34, a display 50, a memory 51, an A / D conversion circuit 310, 340, and a pump drive circuit 320. , And each part of the valve drive circuit 330 is supplied with electric power.
  • the acceleration sensor 34 includes a 3-axis acceleration sensor integrally mounted on the main body 10 and represents the direction of the gravitational acceleration vector with respect to the main body 10 (thus, the rotational posture of the subject's wrist 90 wearing the main body 10). Output data.
  • the A / D conversion circuit 340 converts the output of the acceleration sensor 34 from an analog signal to a digital signal and outputs it to the CPU 110.
  • the CPU 110 acts as a rotation posture detection unit and detects the rotation posture of the wrist 90 to which the cuff 20 is attached based on the output of the acceleration sensor 34.
  • the XYZ Cartesian coordinate system is set in the main body 10.
  • the Z axis is in the thickness direction of the main body 10
  • the X axis is in the lateral direction of the main body 10 (corresponding to the width direction of the wrist 90)
  • the Y axis (not shown) is in the longitudinal direction of the main body 10 (corresponding to the longitudinal direction of the wrist 90).
  • Each is set.
  • the pump 32 supplies air as a fluid to the fluid bag 22 through the air pipe 39 in order to pressurize the pressure (cuff pressure) in the fluid bag 22 contained in the cuff 20.
  • the valve 33 is opened and closed to discharge the air from the fluid bag 22 through the air pipe 39 or to fill the fluid bag 22 with air to control the cuff pressure.
  • the pump drive circuit 320 drives the pump 32 based on a control signal given from the CPU 110.
  • the valve drive circuit 330 opens and closes the valve 33 based on a control signal given from the CPU 110.
  • the pressure sensor 31 and the A / D conversion circuit 310 function as a pressure detection unit that detects the pressure of the cuff.
  • the pressure sensor 31 is a piezoresistive pressure sensor in this example, and outputs the pressure (cuff pressure) in the fluid bag 22 contained in the cuff 20 as an electric resistance due to the piezoresistive effect through the air pipe 39.
  • the A / D conversion circuit 310 converts the output (electrical resistance) of the pressure sensor 31 from an analog signal to a digital signal and outputs it to the CPU 110.
  • the CPU 110 acts as an oscillating circuit that oscillates at a frequency corresponding to the electrical resistance from the pressure sensor 31, and acquires a signal representing the cuff pressure according to the oscillating frequency.
  • FIG. 6 shows an operation flow when a user measures blood pressure in a normal blood pressure measurement mode with a sphygmomanometer 100.
  • the measurement switch 52A is continuously pressed for, for example, 3 seconds or more in the power-off state, the power is turned on and the normal blood pressure measurement mode is set by default.
  • step S2 of FIG. 6 when the user presses down the measurement switch 52A provided on the main body 10 and inputs a blood pressure measurement instruction, the CPU 110 initializes the pressure sensor 31 (step S2). Specifically, the CPU 110 initializes the processing memory area, turns off (stops) the pump 32, and adjusts the pressure sensor 31 to 0 mmHg (atmospheric pressure is set to 0 mmHg) with the valve 33 open. )I do.
  • the CPU 110 closes the valve 33 via the valve drive circuit 330 (step S3), and then turns on (starts) the pump 32 via the pump drive circuit 320 to form the cuff 20 (fluid bag 22). Pressurization is started (step S4).
  • the CPU 110 is the pressure inside the fluid bag 22 as shown in FIG. 8A 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 39.
  • Cuff pressure Controls the pressurization speed of the PC.
  • step S5 of FIG. 6 the CPU 110 acts as a blood pressure calculation unit, and the pulse wave signal SM (variable component due to the pulse wave included in the output of the pressure sensor 31) acquired at this time (FIG. 8 (FIG. 8).
  • the pulse wave signal SM variable component due to the pulse wave included in the output of the pressure sensor 31 acquired at this time (FIG. 8 (FIG. 8).
  • the calculation of the blood pressure value is attempted using the sitting algorithm stored in the memory 51.
  • step S6 if the blood pressure value cannot be calculated yet due to lack of data (No in step S6), the cuff pressure PC reaches the upper limit pressure (for safety, for example, 300 mmHg is predetermined). Unless otherwise specified, the processes of steps S4 to S6 are repeated.
  • the CPU 110 calculates the blood pressure value as follows. That is, with respect to the sequence of pulse wave amplitudes (peak to peak) formed by the pulse wave signal SM shown in FIG. 8 (B) obtained from the cuff pressure PC when the cuff 20 is in the pressurizing process, FIG.
  • the envelope ENV as shown in (C) is set. Along with this, it sets the maximum value AmpMax envelope ENV, predetermined ratio alpha dia for loci, two threshold level THD1, Ths1 of alpha sys.
  • THS1 ⁇ sys ⁇ AmpMax.
  • the cuff pressure PCs at the time when the envelope ENV crosses those threshold levels THD1 and THS1 are shown in the diastolic blood pressure (diastolic blood pressure) BPdia1 and the systolic blood pressure (systolic blood pressure), respectively. Calculated as BPsys1.
  • step S6 the CPU 110 turns off the pump 32 (step S7), opens the valve 33 (step S8), and enters the cuff 20 (fluid bag 22). Controls the exhaust of air.
  • the CPU 110 counts the pulse waves obtained from the cuff pressure PC while repeating the processes of steps S4 to S6, and calculates the pulse rate (unit: beat / minute).
  • the CPU 110 displays the calculated blood pressure value and pulse rate on the display 50 (step S9), and controls to save the data such as the blood pressure value and the pulse rate in the memory 51.
  • FIG. 7 shows a first operation flow when a user measures blood pressure in nocturnal blood pressure measurement mode with a sphygmomanometer 100. At the start of this flow, the sphygmomanometer 100 is assumed to be in the normal blood pressure measurement mode.
  • step S11 of FIG. 7 when the user presses down the nighttime measurement switch 52B provided on the main body 10, the sphygmomanometer 100 shifts from the normal blood pressure measurement mode to the nighttime blood pressure measurement mode.
  • a schedule for measuring once every hour for example, from the time when the nighttime measurement switch 52B is pressed until, for example, 7:00 am is set. It should be noted that the schedule is not limited to this, and even if a schedule for measuring on time such as 7:00 am, 1:00 am, 2:00 pm, and 3:00 am is set after the nighttime measurement switch 52B is pressed. Good.
  • the CPU 110 determines whether or not the measurement time is determined by the schedule (in the nighttime blood pressure measurement mode). If it is not the measurement time specified in the schedule (No in step S12), wait for the measurement time specified in the schedule to be reached.
  • step S13 the CPU 110 acts as a rotation posture detection unit, and the rotation of the wrist 90 to which the cuff 20 is attached is rotated based on the output of the acceleration sensor 34. Detect posture.
  • the rotational posture of the wrist 90 to which the cuff 20 is attached is shown in FIG. 5A based on the direction of the gravity acceleration vector G output by the acceleration sensor 34. It is detected whether it is “sideways”, “upward” as shown in FIG. 5 (B), or “downward” as shown in FIG. 5 (C).
  • step S14 blood pressure measurement is started in the same manner as in steps S2 to S4 of FIG. That is, the CPU 110 first initializes the pressure sensor 31 (step S14).
  • the CPU 110 closes the valve 33 via the valve drive circuit 330 (step S15), and then turns on (starts) the pump 32 via the pump drive circuit 320 to form the cuff 20 (fluid bag 22). Pressurization is started (step S16). At this time, the CPU 110 controls the pressurizing speed of the cuff pressure PC in the same manner as shown in FIG. 8 (A).
  • step S17 of FIG. 7 the CPU 110 functions as the first blood pressure calculation unit, and the pulse wave signal SM (variable component due to the pulse wave included in the output of the pressure sensor 31) acquired at this time (FIG. 7).
  • the pulse wave signal SM (variable component due to the pulse wave included in the output of the pressure sensor 31) acquired at this time (FIG. 7).
  • an attempt is made to calculate blood pressure values (maximum blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure)) using an algorithm for the supine position.
  • the cuff pressure PC reaches the upper limit pressure (for safety, for example, 300 mmHg is predetermined). Unless otherwise specified, the processes of steps S16 to S18 are repeated.
  • the CPU 110 calculates the blood pressure value as follows. That is, the envelope ENV as shown in FIG. 9 with respect to the sequence of pulse wave amplitudes (peak to peak) formed by the pulse wave signal SM obtained from the cuff pressure PC when the cuff 20 is in the pressurizing process. (Similar to that shown in FIG. 8C) is set.
  • the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated more accurately than when the algorithm for the sitting position is simply used.
  • the CPU 110 counts the pulse waves obtained from the cuff pressure PC while repeating the processes of steps S16 to S18, and calculates the pulse rate (unit: beat / minute).
  • step S18 the CPU 110 turns off the pump 32 (step S19), opens the valve 33 (step S20), and cuffs 20 (fluid bag 22). ) Controls the exhaust of the air inside.
  • the CPU 110 acts as an error correction unit to correct the calculated blood pressure value by the amount of the blood pressure measurement error according to the rotational posture of the wrist 90 detected in step S13.
  • the CPU 110 refers to the "error average" column of the error table (FIG. 10) stored in the memory 51, and the rotational posture of the wrist 90 is "sideways" as shown in FIG. 5 (A).
  • 1.19 mmHg and 0.75 mmHg are added to the calculated diastolic blood pressure (diastolic blood pressure) BPdia2 and systolic blood pressure (systolic blood pressure) BPsys2, respectively.
  • the calculated diastolic blood pressure (diastolic blood pressure) BPdia2 and systolic blood pressure (systolic blood pressure) BPsys2 are 3.06 mmHg, respectively. Add only 3.30 mmHg.
  • the calculated diastolic blood pressure (diastolic blood pressure) BPdia2 and systolic blood pressure (systolic blood pressure) BPsys2 are 2.84 mmHg, respectively. Add only 3.55 mmHg.
  • the once calculated blood pressure value is corrected by the amount of the blood pressure measurement error according to the detected rotational posture of the wrist 90.
  • the blood pressure measurement error according to the rotational posture of the wrist 90 can be suppressed. Therefore, the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated accurately.
  • the CPU 110 displays the calculated blood pressure value and pulse rate on the display 50 (step S22), and controls to save the blood pressure value, the pulse rate, and the data representing the rotational posture of the wrist 90 in the memory 51. Do.
  • step S23 the CPU 110 determines whether or not all the blood pressure measurements defined in the above schedule have been completed.
  • the process returns to step S12. Then, it waits for the next measurement time determined in the above schedule (No in step S12).
  • step S12 When the next measurement time specified in the above schedule is reached (Yes in step S12), the CPU 110 repeats the processes of steps S13 to S22. In this way, the CPU 110 repeats the measurement as long as the blood pressure measurement is still scheduled according to the above schedule (“incomplete” in step S23), and when all the blood pressure measurements determined in the above schedule are completed (in step S23). "End"), the above-mentioned nocturnal blood pressure measurement mode is terminated.
  • the CPU 110 acts as a blood pressure acquisition unit (including the first blood pressure calculation unit and the error correction unit), and the cuff 20 is in the pressurization process or
  • the blood pressure is calculated based on the cuff pressure using an algorithm for calculating blood pressure by the oscillometric method, and the calculated blood pressure value is the blood pressure according to the detected rotational posture of the wrist 90. Correct to suppress measurement error. Therefore, according to the sphygmomanometer 100, the blood pressure can be calculated accurately according to the rotational posture of the wrist 90 as the measurement site.
  • the rotational posture of the wrist 90 was detected by dividing it into three angular ranges in the ZX plane as shown in FIGS. 5 (D) to 5 (F). It is not limited to.
  • the CPU 110 may detect the rotational posture of the wrist 90 by dividing it into four or more angular ranges. In that case, in the error table of FIG. 10, the blood pressure measurement error corresponding to each angle range is stored in advance for each of the four or more angle ranges. Then, in step S21, the CPU 110 corrects the calculated blood pressure value by the amount of the blood pressure measurement error according to the angle range of the wrist 90 detected in step S13. In this case, the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated more accurately.
  • FIG. 11 shows a second operation flow when the user measures blood pressure in the nocturnal blood pressure measurement mode with the sphygmomanometer 100. At the start of this flow, the sphygmomanometer 100 is assumed to be in the normal blood pressure measurement mode.
  • the memory 51 acts as a candidate algorithm storage unit and replaces the supine algorithm (using the systolic threshold THS2 and the diastolic threshold THS2 shown in FIG. 9).
  • FIG. 5 (A), FIG. 5 (B), and FIG. 5 (C) show a plurality of candidate algorithms defined to suppress the blood pressure measurement error according to the rotational posture of the wrist 90 (FIG. 12 described later).
  • the systolic threshold THS2-h, THS2-u, THS2-d and the corresponding diastolic thresholds THD2-h, THD2-u, THD2-d are used in combination, respectively.) Is memorized in advance.
  • the sphygmomanometer 100 measures the nighttime blood pressure from the normal blood pressure measurement mode as in the first operation flow. Move to mode.
  • a schedule for measuring once every hour for example, from the time when the nighttime measurement switch 52B is pressed until, for example, 7:00 am is set. It should be noted that the schedule is not limited to this, and even if a schedule for measuring on time such as 7:00 am, 1:00 am, 2:00 pm, and 3:00 am is set after the nighttime measurement switch 52B is pressed. Good.
  • the CPU 110 determines whether or not the measurement time is determined by the schedule (in the nighttime blood pressure measurement mode). If it is not the measurement time specified in the schedule (No in step S42), the measurement time specified in the schedule is waited for.
  • step S43 the CPU 110 acts as a rotation posture detection unit and is based on the output of the acceleration sensor 34, as in the first operation flow. , Detects the rotational posture of the wrist 90 to which the cuff 20 is attached.
  • the CPU 110 has a rotational posture of the wrist 90 to which the cuff 20 is attached based on the direction of the gravitational acceleration vector G output by the acceleration sensor 34. It detects which of "sideways” as shown in A), “upward” as shown in FIG. 5 (B), and “downward” as shown in FIG. 5 (C).
  • the threshold THS2-u for systole and the corresponding threshold THS2-u for diastole shown in FIG. 12 Select and set the combination with u.
  • the systolic threshold THS2-d and the corresponding diastolic threshold THS2-d shown in FIG. 12 are shown.
  • the combination with d is selected and set.
  • step S45 blood pressure measurement is started in the same manner as in steps S2 to S4 of FIG. That is, the CPU 110 first initializes the pressure sensor 31 (step S45).
  • the CPU 110 closes the valve 33 via the valve drive circuit 330 (step S46), and then turns on (starts) the pump 32 via the pump drive circuit 320 to form the cuff 20 (fluid bag 22). Pressurization is started (step S47). At this time, the CPU 110 controls the pressurizing speed of the cuff pressure PC in the same manner as shown in FIG. 8 (A).
  • step S48 of FIG. 11 the CPU 110 functions as a second blood pressure calculation unit, and the pulse wave signal SM (variable component due to the pulse wave included in the output of the pressure sensor 31) acquired at this time (FIG. Based on (similar to that shown in 8 (B)), an attempt is made to calculate the blood pressure value (maximum blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure)) using the currently set algorithm.
  • the blood pressure value maximum blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure)
  • step S49 if the blood pressure value cannot be calculated yet due to lack of data (No in step S49), the cuff pressure PC reaches the upper limit pressure (for safety, for example, 300 mmHg is predetermined). Unless otherwise specified, the processes of steps S47 to S49 are repeated.
  • the CPU 110 calculates the blood pressure value as follows. That is, the envelope ENV as shown in FIG. 12 with respect to the sequence of pulse wave amplitudes (peak to peak) formed by the pulse wave signal SM obtained from the cuff pressure PC when the cuff 20 is in the pressurizing process. -H, ENV-u, ENV-d are set.
  • the envelope ENV-h exemplifies the envelope when the rotation posture of the wrist 90 is "sideways" as shown in FIG. 5 (A).
  • the envelope ENV-u exemplifies the envelope when the rotational posture of the wrist 90 is "upward” as shown in FIG. 5 (B).
  • the envelope ENV-d exemplifies the envelope when the rotational posture of the wrist 90 is "downward" as shown in FIG. 5 (C).
  • the envelopes ENV-h, ENV-u, and ENV-d are displaced from each other in the horizontal axis (cuff pressure) direction (in the example of FIG. 12, each envelope ENV-h).
  • ENV-u, ENV-d's maximum amplitude value AmpMax is normalized to 1.).
  • the CPU 110 has a threshold line ENV-h shown in FIG.
  • the cuff pressure PC at the time of crossing is calculated as systolic blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure), respectively.
  • the envelope ENV-u shown in FIG. 12 crosses the threshold THS2-u and THD2-u.
  • the cuff pressure PC at the time point is calculated as systolic blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure), respectively.
  • the CPU 110 has the envelope ENV-d shown in FIG. 12 crossing the threshold THS2-d and THD2-d.
  • the cuff pressure PC at the time point is calculated as systolic blood pressure (systolic blood pressure) and diastolic blood pressure (diastolic blood pressure), respectively.
  • the rotational posture of the wrist 90 is "sideways" as shown in FIG. 5 (A), "upward” as shown in FIG.
  • the CPU 110 counts the pulse waves obtained from the cuff pressure PC while repeating the processes of steps S47 to S49, and calculates the pulse rate (unit: beat / minute).
  • step S49 the CPU 110 turns off the pump 32 (step S50), opens the valve 33 (step S51), and cuffs 20 (fluid bag 22). ) Controls the exhaust of the air inside.
  • the CPU 110 displays the calculated blood pressure value and pulse rate on the display 50 (step S52), and controls to save the blood pressure value, the pulse rate, and the data representing the rotational posture of the wrist 90 in the memory 51. Do.
  • step S53 the CPU 110 determines whether or not all the blood pressure measurements defined in the above schedule are completed.
  • the process returns to step S42. Then, it waits for the next measurement time determined in the above schedule (No in step S42).
  • step S42 When the next measurement time specified in the above schedule is reached (Yes in step S42), the CPU 110 repeats the processes of steps S43 to S52. In this way, the CPU 110 repeats the measurement as long as the blood pressure measurement is still scheduled according to the above schedule (“incomplete” in step S53), and when all the blood pressure measurements determined in the above schedule are completed (in step S53). "End"), the above-mentioned nocturnal blood pressure measurement mode is terminated.
  • the CPU 110 acts as a blood pressure acquisition unit (including an algorithm switching unit and a second blood pressure calculation unit), and the detected rotation of the wrist 90.
  • a blood pressure acquisition unit including an algorithm switching unit and a second blood pressure calculation unit
  • the blood pressure value is used by the oscillometric method based on the cuff pressure. Is calculated. Therefore, according to the sphygmomanometer 100, the blood pressure can be calculated accurately according to the rotational posture of the wrist 90 as the measurement site.
  • the rotational posture of the wrist 90 was detected by dividing it into three angular ranges in the ZX plane as shown in FIGS. 5 (D) to 5 (F). It is not limited to.
  • the CPU 110 may detect the rotational posture of the wrist 90 by dividing it into four or more angular ranges.
  • the memory 51 stores in advance a plurality of candidate algorithms defined to suppress the blood pressure measurement error according to each angle range for each of the four or more angle ranges.
  • the CPU 110 selects and sets an algorithm corresponding to the detected angular range of the wrist 90 from among the plurality of candidate algorithms. In this case, the blood pressure values (maximum blood pressure and diastolic blood pressure) can be calculated more accurately.
  • step S17 of FIG. 7 the CPU 110 uses the algorithm for the supine position (in FIG. 9).
  • the blood pressure value was calculated using the systolic threshold THS2 and the diastolic threshold THS2), but the present invention is not limited to this. This is because the threshold levels THS2 and THD2 of the supine position algorithm are not particularly countermeasures against the blood pressure measurement error that occurs depending on the rotational posture of the wrist 90.
  • the CPU 110 instead of the supine position algorithm (thresto level THS2, THD2), for example, identifies the wrist 90 regardless of the rotational posture of the wrist 90 detected in step S13.
  • a specific algorithm eg, a systolic threshold shown in FIG. 12
  • the blood pressure value may be calculated using a combination of level THS2-h and the corresponding systolic threshold level THD2-h).
  • step S21 of FIG. 7 the CPU 110 calculates the blood pressure value in step S17. , No need to correct.
  • the CPU 110 is set to "sideways" in the error table of FIG.
  • step S17 With reference to the "difference" column, add 1.87 mmHg and 2.55 mmHg to the diastolic blood pressure (diastolic blood pressure) BPdia2-s and systolic blood pressure (systolic blood pressure) BPsys2-s calculated in step S17, respectively. .. Further, when the rotational posture of the wrist 90 detected in step S13 is "downward” as shown in FIG. 5 (C), in step S21 of FIG. 7, the CPU 110 is set to "laterally" in the error table of FIG.
  • the blood pressure value (maximum blood pressure and diastolic blood pressure) can be calculated accurately. Moreover, since the CPU 110 corrects the calculated blood pressure value only when the user's wrist 90 is in the other rotational posture, the blood pressure calculation process becomes simple.
  • the sphygmomanometer 100 calculates the blood pressure value so as to suppress the blood pressure measurement error according to the detected rotation posture of the wrist 90, and therefore, according to the rotation posture of the wrist 90 as the measurement site. , Blood pressure can be calculated accurately.
  • the sphygmomanometer 100 is a type that presses the wrist 90 as the measurement site (in the above example, the left wrist is used, but the right wrist may be used), the user is compared with the type that presses the upper arm. It is expected that (subject) will not interfere with sleep (Imai et al., “Development and evaluation of a home nocturnal blood pressure monitoring system using a wrist-cuff device”, Blood Pressure Monitoring 2018, 23, P318- 326). Therefore, this sphygmomanometer 100 is suitable for nighttime blood pressure measurement.
  • this sphygmomanometer 100 is integrally and compactly configured as a wrist-type sphygmomanometer, it is convenient for the user to handle. Further, in this sphygmomanometer 100, since the rotational posture detection unit including the acceleration sensor 34 is integrally mounted on the main body 10 (and the cuff 20), the direction of the gravitational acceleration vector G relative to the main body 10 is increased. The rotational posture of the wrist 90 can be easily detected.
  • the blood pressure is calculated in the process of pressurizing the cuff 20 (fluid bag 22), but the present invention is not limited to this. Blood pressure may be calculated in the process of depressurizing the cuff 20.
  • the blood pressure measurement instruction and the transition instruction to the nighttime blood pressure measurement mode are input by the measurement switch 52A and the nighttime measurement switch 52B as the operation unit provided on the main body 10, but the present invention is limited to this. is not it.
  • a communication unit capable of wireless communication is mounted on the main body 10, and a blood pressure measurement instruction and a transition instruction to the nighttime blood pressure measurement mode are input from a smartphone or the like existing outside the blood pressure monitor 100 via this communication unit. You may.
  • the main body 10 is provided integrally with the cuff 20, but the present invention is not limited to this.
  • the main body 10 may be configured as a separate body from the cuff 20 and may be connected to the cuff 20 (fluid bag 22) so that fluid can flow through a flexible air tube.
  • the above-mentioned blood pressure calculation method (particularly, the operation flow of FIGS. 6, 7, and 11) is used as software (computer program) for non-temporary (compact disc), DVD (digital universal disc), flash memory, or the like. Data may be recorded on a recording medium that can store data in non-transitory).
  • a substantial computer device such as a personal computer, a PDA (Personal Digital Assistance), or a smartphone, the above-mentioned blood pressure calculation method can be applied to those computer devices. Can be executed.

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