Blood pressure measuring device, blood pressure measuring method, and blood pressure measuring program

Abstract

To suppress an impact of noise at a timing of control switching from cuff winding strength determination to blood pressure calculation.SOLUTION: A blood pressure measuring device includes: a cuff wound around a part to be measured; a pressure detection part for detecting cuff pressure in the cuff; a pressure control part for controlling the cuff pressure; a blood pressure calculation part for performing blood pressure calculation processing for calculating blood pressure of a person to be measured on the basis of the detected cuff pressure; and a winding strength determination part for performing winding strength determination processing for determining winding strength of the cuff onto the part to be measured. The pressure control part performs constant pressure control to keep the cuff pressure at a constant target pressure value from the start of cuff pressure increase to the end of the winding strength determination processing, and performs constant speed pressure increase control for increasing the cuff pressure at a constant speed for calculating the blood pressure after the winding strength determination processing. The winding strength determination part determines the winding strength during the constant pressure control.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a blood pressure measurement device, a blood pressure measurement method, and a blood pressure measurement program. [Background technology]

[0002] In recent years, health management has become commonplace by measuring information about an individual's physical and health, such as blood pressure values, using measuring devices and recording and analyzing the measurement results. One example of such measuring devices is a blood pressure monitor that attaches a cuff to the subject's upper arm, wrist, or other part of the body to be measured, and is equipped with a function to determine the tightness of the cuff wrapping (see Patent Document 1).

[0003] In the blood pressure monitor disclosed in Patent Document 1, after the cuff is attached, a constant voltage is applied to the pump to drive it during initial inflation, and the wrapping strength of the cuff is determined from the cuff pressure-inflation time characteristic (cuff pressure curve) from the initial pressure until the pressure value at the end of initial inflation is reached, and then the blood pressure is calculated.

[0004] However, with this type of constant voltage drive, the initial inflation level cannot be set too low in order to ensure the time required to determine the cuff wrapping strength, and since the pressure pulse wave must be acquired for blood pressure calculation immediately after determining the cuff wrapping strength, noise generated at the timing of control switching could adversely affect the pressure pulse wave. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5408142 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-described conventional techniques, an object of the present invention is to provide a technique that can suppress the influence of noise at the timing of switching control from determining the wrapping strength of the cuff to calculating blood pressure. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: a cuff that is wrapped around the part to be measured; a pressure detection unit that detects a cuff pressure in the cuff; a pressure control unit that controls the cuff pressure; a blood pressure calculation unit that performs a blood pressure calculation process to calculate the blood pressure of the subject based on the detected cuff pressure; a wrapping strength determination unit that performs a wrapping strength determination process to determine the wrapping strength of the cuff around the measurement target part; Equipped with The pressure control unit is performing constant pressure control to maintain the cuff pressure at a constant target pressure value from the start of increasing the cuff pressure until the end of the wrapping strength determination process, and performing constant speed inflation control to increase the cuff pressure at a constant speed in order to calculate the blood pressure after the end of the wrapping strength determination process; The winding strength determination unit The blood pressure measuring device is characterized in that the wrapping strength is determined during the constant pressure control.

[0008] According to this, in the constant pressure control for determining the cuff wrapping strength, the control is switched from a state in which the cuff pressure is maintained at a constant target pressure value to a constant speed inflation control for blood pressure calculation, thereby suppressing the influence of noise on blood pressure calculation at the switching timing.

[0009] In addition, in the present invention, The winding strength determination unit The wrapping strength may be determined based on a change in the cuff pressure during a determination time period, which is the time period from the initial pressure until the cuff pressure reaches the target pressure value and stabilizes.

[0010] This makes it possible to determine the wrapping strength according to the magnitude of the cuff pressure applied to the part to be measured when the cuff is wrapped around the part to be measured.

[0011] In addition, in the present invention, The winding strength determination unit The wrapping strength may be determined by comparing the number of times the cuff pressure falls below the target pressure value during the determination time period and the difference from the target pressure value with predetermined threshold values.

[0012] This makes it possible to determine whether the magnitude of the cuff pressure applied to the measurement target part when the cuff is wrapped around the measurement target part is smaller than an appropriate value, as the wrapping strength.

[0013] In addition, in the present invention, The winding strength determination unit The wrapping strength may be determined based on whether the cuff pressure increases or decreases relative to the target pressure value during the determination time period.

[0014] This makes it possible to determine whether the magnitude of the cuff pressure applied to the measurement target part when the cuff is wrapped around the measurement target part is greater than an appropriate value, as the wrapping strength.

[0015] In addition, in the present invention, The target pressure value may be less than 30 mmHg.

[0016] According to this, constant pressure control is performed with a cuff pressure lower than 30 mmHg as the target pressure value, so that constant speed inflation control for blood pressure calculation can be started from a state where the cuff pressure is lower.

[0017] In addition, in the present invention, The pressure control unit is The constant speed pressurization control may be performed depending on the result of the wrapping strength determination process.

[0018] This allows accurate blood pressure calculation by performing constant velocity inflation control when the wrapping strength is appropriate, and by discharging the air from the cuff without performing constant velocity inflation control when the wrapping strength is inappropriate, the burden on the subject can be reduced.

[0019] In addition, in the present invention, The pressure control unit is The constant pressure control may be performed by PID control.

[0020] In addition, in the present invention, The pressure control unit is A pump for supplying air to the cuff and an exhaust valve for controlling exhaust from the cuff may be controlled.

[0021] The present invention also provides detecting a cuff pressure in a cuff wrapped around the measurement target part; performing constant pressure control to maintain the cuff pressure at a constant target pressure value; a step of performing a wrapping strength determination process to determine a wrapping strength of the cuff around the measurement target portion during the constant pressure control; a step of performing a constant speed inflation control for increasing the cuff pressure at a constant speed after the wrapping strength determination process is completed; performing a blood pressure calculation process to calculate the blood pressure of the subject based on the cuff pressure during the constant velocity inflation control; The blood pressure measurement method is characterized by comprising:

[0022] According to this, in the constant pressure control for determining the cuff wrapping strength, the control is switched from a state in which the cuff pressure is maintained at a constant target pressure value to a constant speed inflation control for blood pressure calculation, thereby suppressing the influence of noise on blood pressure calculation at the switching timing.

[0023] The present invention also provides On the computer, detecting a cuff pressure in a cuff wrapped around the measurement target part; performing constant pressure control to maintain the cuff pressure at a constant target pressure value; a step of performing a wrapping strength determination process to determine a wrapping strength of the cuff around the measurement target portion during the constant pressure control; a step of performing a constant speed inflation control for increasing the cuff pressure at a constant speed after the wrapping strength determination process is completed; performing a blood pressure calculation process to calculate the blood pressure of the subject based on the cuff pressure during the constant velocity inflation control; The blood pressure measurement program is characterized by executing the following.

[0024] According to this, in the constant pressure control for determining the cuff wrapping strength, the control is switched from a state in which the cuff pressure is maintained at a constant target pressure value to a constant speed inflation control for blood pressure calculation, thereby suppressing the influence of noise on blood pressure calculation at the switching timing. [Effects of the Invention]

[0025] According to the present invention, it is possible to suppress the influence of noise at the timing of switching control from determining the wrapping strength of the cuff to calculating blood pressure. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a diagram illustrating an outline of a hardware configuration of a blood pressure measurement device according to a first embodiment. [Figure 2] FIG. 2 is a functional block diagram of the blood pressure measurement device according to the first embodiment. [Figure 3] FIG. 3 is a flowchart illustrating the procedure of the overall process of the blood pressure measurement device according to the first embodiment. [Figure 4] FIG. 4 is a graph showing the time variation of the cuff pressure and the pressure pulse wave when the blood pressure measurement device according to the first embodiment is used. [Figure 5] FIG. 5 is a flowchart illustrating a procedure of the wrapping strength determination process of the blood pressure measurement device according to the first embodiment. [Figure 6] FIG. 6 is a graph showing a variation pattern of the cuff pressure for each wrapping strength in the blood pressure measurement device according to the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating an outline of a hardware configuration of a blood pressure measurement device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0028] Example 1 An example of an embodiment of the present invention will be described below. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are not intended to limit the scope of the present invention to those only.

[0029] (Device configuration) FIG. 1 is a schematic diagram of a hardware configuration of a blood pressure measurement device 1 according to this embodiment.

[0030] The blood pressure measurement device 1 includes a cuff 11, a pressure sensor 12, a pressure pump 13, an exhaust valve 14, an air tube 15, an oscillator circuit 21, a pump drive circuit 22, a valve drive circuit 23, a display unit 25, a memory 24, an operation switch 26, a power supply 27, and a CPU 100. The blood pressure measurement device 1 corresponds to the blood pressure measurement device of the present invention. The cuff 11, the pressure pump 13, and the exhaust valve 14 correspond to the cuff, the pump, and the exhaust valve of the present invention, respectively.

[0031] Cuff 11 includes air bag 11a containing air. Cuff 11 is provided with pressure sensor 12 for detecting the pressure inside air bag 11a of cuff 11 (hereinafter referred to as "cuff pressure") via air tube 15, pressure pump 13 for supplying air to air bag 11a, and exhaust valve 14 that opens and closes to maintain the pressure inside air bag 11a or to exhaust air from air bag 11a.

[0032] Furthermore, the blood pressure measurement device 1 includes a CPU (Central Processing Unit) 100 for controlling each part of the device, and a program executed for a wrapping strength determination process and a blood pressure measurement process, which will be described later. The device is equipped with a memory 24 for storing data such as the weight, blood pressure measurement results, etc., a display unit 25 for displaying various information such as the results of wrapping strength judgment and blood pressure measurement results, an operation switch 26 for inputting various instructions for measurement, and a power supply 27 for supplying power to each part of the device such as the CPU.

[0033] Furthermore, the oscillator circuit 21 outputs a signal having an oscillation frequency corresponding to the output value of the pressure sensor 12 to the CPU 100. The pump drive circuit 22 controls the drive of the pressure pump 13 based on a control signal output from the CPU 100. The valve drive circuit 23 controls the opening and closing of the exhaust valve 14 based on the control signal output from the CPU 100.

[0034] FIG. 2 is a functional block diagram of the blood pressure measurement device 1. The CPU 100 includes a pressure detection unit 110, a pressure control unit 120, a blood pressure calculation unit 130, a condition determination unit 140, and a wrapping strength determination unit 150. The pressure detection unit 110, the pressure control unit 120, the blood pressure calculation unit 130, and the wrapping strength determination unit 150 correspond to the pressure detection unit, the pressure control unit, the blood pressure calculation unit, and the wrapping strength determination unit of the present invention, respectively.

[0035] The output signal of the oscillator circuit 21 is input to the pressure detection unit 110. The pressure detection unit 110 detects the oscillation frequency of the input signal and converts the detected oscillation frequency into a pressure value signal. The pressure detection unit 110 comprises an HPF (High Pass Filter) unit that processes the pressure value signal with HPF to extract and output a pressure pulse wave signal, and an LPF (Low Pass Filter) unit that processes the pressure value signal with LPF to extract and output a pressure pulse wave signal. and an LPF section that extracts and outputs a pressure absolute value signal.

[0036] The pressure control unit 120 controls the operation of the pump drive circuit 22 and the valve drive circuit 23 to control the cuff pressure of the cuff 11 .

[0037] The blood pressure calculation unit 130 receives the pressure pulse wave signal extracted by the HPF unit of the pressure detection unit 110 and processes the received pressure pulse wave signal according to the oscillometric method to calculate the diastolic blood pressure (minimum blood pressure) and the systolic blood pressure (maximum blood pressure).

[0038] A cuff pressure signal indicating the cuff pressure detected in time series from the LPF section of the pressure detection section 110 is input to the condition determination section 140. Based on the cuff pressure signal input in time series, the condition determination section 141 determines whether or not a condition (determination condition) for determining the wrapping strength is satisfied.

[0039] The wrapping strength determination unit 150 receives a cuff pressure signal indicating the cuff pressure detected in time series from the LPF unit of the pressure detection unit 110, and stores the input cuff pressure signal in a predetermined area of ​​the memory 24. The wrapping strength determination unit 150 waits until a determination condition is satisfied, and then performs a wrapping strength determination, which will be described later, based on the cuff pressure signal read from the memory 24.

[0040] (Blood pressure measurement method) Fig. 3 is a flowchart showing the procedure of the overall processing of the blood pressure measurement method by the blood pressure measurement device 1. The overall processing of blood pressure measurement shown in Fig. 3 is stored in advance as a program in a predetermined area of ​​the memory 24, and is realized by the CPU 100 reading and executing the program from the memory 24. The program may be stored in a computer-readable storage medium and read from the storage medium into the blood pressure measurement device 1. Fig. 4 is a graph showing the time changes of the pressure pulse wave and the cuff pressure detected during blood pressure measurement on the same time axis.

[0041] When measuring blood pressure, the subject wraps cuff 11 around the part to be measured, such as the upper arm or wrist, in advance. The following description is based on the assumption that the subject has made predetermined settings using operation switch 26 and issued a command to start blood pressure measurement. Upon receiving the command to start blood pressure measurement, blood pressure measurement device 1 has already performed predetermined initialization, such as opening exhaust valve 14 and setting the cuff pressure to atmospheric pressure (initial pressure).

[0042] When blood pressure measurement is started, the pressure control unit 120 starts constant pressure control (step S1). At this time, the pressure control unit 120 controls the pump drive circuit 22 so that the cuff pressure detected by the pressure sensor 12 is constant, using an initial inflation end pressure value, which is the cuff pressure at which the initial inflation ends, as a target pressure value (referred to as "constant pressure control"). This constant pressure control can be performed by, for example, PID control, but the control method is not limited to this.

[0043] The condition determination unit 140 monitors the cuff pressure detected by the pressure sensor 12 and determines whether the cuff pressure has reached the target pressure value and is stable (step S2). Whether the cuff pressure is stable can be determined, for example, based on whether the deviation of the cuff pressure from the target pressure value is within a range of ±5%, but the determination criteria are not limited to this.

[0044] If it is determined in step S2 that the cuff pressure has not reached the target pressure value or is not stable, step S2 is repeated and the condition determination unit 140 continues to monitor the cuff pressure. Before proceeding to step S3, the sampled cuff pressure is stored in a predetermined area of ​​the memory 24 in association with the time information of the sampling.

[0045] If the condition determination unit 140 determines in step S2 that the cuff pressure has reached the target pressure value and is stable, the wrapping strength determination unit 150 executes the wrapping strength determination process shown in Fig. 5 based on the information on the change in the cuff pressure over time stored in the memory 24 (step S3). In this way, the wrapping strength determination process is performed under constant pressure control.

[0046] In the wrapping strength determination process of step S3, the wrapping strength determination unit 150 determines the wrapping strength based on the cuff pressure fluctuation pattern during constant pressure control, from the initial pressure until the cuff pressure reaches the target pressure value and stabilizes. Here, it determines whether the wrapping strength of the cuff 11 falls into one of three categories: loose, tight, or tight. When the cuff 11 is wrapped around the part to be measured, such as the upper arm, to form a cylinder, if the circumferential length of this cylinder is approximately equal to the circumferential length of the part to be measured, the pressure applied to the part to be measured by the cuff 11 is at an appropriate level for blood pressure measurement, and this state is considered to be tight. If the circumferential length of the cylinder formed by the cuff 11 is shorter than the circumferential length of the part to be measured, the cuff 11 is wrapped too tightly around the part to be measured, and the pressure applied to the part to be measured by the cuff 11 is higher than the appropriate level, and this state is considered to be tight. If the circumferential length of the cylinder formed by cuff 11 is longer than the circumferential length of the part to be measured, cuff 11 is wrapped loosely around the part to be measured, and the pressurization of the part to be measured by cuff 11 is lower than the appropriate level, and this state is defined as loose wrapping. Here, the time from when the cuff pressure reaches the target pressure value from the initial pressure and stabilizes under constant pressure control (time P1 until Tc in FIG. 4) corresponds to the determination time of the present invention. Time Tc corresponds to the end of the wrapping strength determination process.

[0047] Figure 6 is a graph showing an example of the cuff pressure change pattern when the wrapping strength is determined to be loose, tight, or tight. Figure 6 shows an enlarged view of the area surrounded by the dashed line in Figure 4. In the loose wrapping state, the cuff pressure rises slowly during inflation and falls far below the target pressure, a so-called undershoot state, before reaching the target pressure. In the tight wrapping state, the cuff pressure rises sharply immediately after inflation begins and exceeds the target pressure, a so-called overshoot state, and then fluctuates, fluctuating above and below the target pressure, before reaching the target pressure. In the tight wrapping state, the cuff pressure rises with inflation, but does not exceed the target pressure, and quickly approaches the target pressure before reaching it.

[0048] The wrapping strength determination unit 150 determines whether the number of times and the amount by which the cuff pressure falls below the target pressure value before it reaches the target pressure value from the initial pressure are greater than a predetermined threshold (step S31). Here, the amount by which the cuff pressure falls below the target pressure value is the magnitude of the difference between the target pressure value and the cuff pressure. In step S31, if it is determined that the number of times and the amount by which the cuff pressure is less than the target pressure value before the cuff pressure reaches the target pressure value are greater than a predetermined threshold, the wrapping strength is determined to be loose (step S32).

[0049] In step S31, if it is determined that the number of times and the amount by which the cuff pressure is below the target pressure value before the cuff pressure reaches the target pressure value are below a predetermined threshold, the wrapping strength determination unit 150 determines whether the pressure value increases or decreases relative to the target pressure value (step S33). In step S33, if the cuff pressure increases or decreases relative to the target pressure value before it reaches the target pressure value, the wrapping strength is determined to be tight (step S34).

[0050] In step S33, if the cuff pressure does not increase or decrease relative to the target pressure value before it reaches the target pressure value, the wrapping strength is determined to be snug (step S35).

[0051] In the winding strength determination in step S3, if it is determined that the winding is tight, After completing the initial inflation under constant control, the pressure control unit 120 starts controlling the pump drive circuit 22 so that the cuff pressure increases at a constant rate (referred to as "constant rate inflation control") (step S5). The constant rate inflation control is executed at time P2 after Tc in FIG. 4.

[0052] The initial pressurization end pressure (target pressure) is set to, for example, about 10 mmHg, lower than the typical 30 mmHg value used in conventional constant voltage driving. By setting the initial pressurization end pressure low in this way, it is possible to acquire a blood pressure measurement pressure pulse wave from a lower pressure after the wrapping strength determination process is completed.

[0053] At the end of the wrapping strength determination process in step S3, the pump voltage (drive voltage of pump drive circuit 22) is maintained in a balanced state under constant pressure control, and then the control is switched to constant-speed inflation control to start acquiring a pressure pulse wave for blood pressure measurement. This prevents a sudden change in inflation speed, suppresses the influence of noise at the control switching timing, and allows for clear acquisition of a pressure pulse wave change.

[0054] The blood pressure calculation unit 130 acquires a pressure pulse wave for blood pressure measurement from the HPF unit of the pressure detection unit 110 by constant speed inflation control, and performs blood pressure calculation processing to calculate blood pressure values ​​such as systolic blood pressure and diastolic blood pressure by the oscillometric method (step S6).

[0055] The CPU 100 displays the measurement results, such as the blood pressure values ​​calculated in step S6, on the display unit 25 of the blood pressure measurement device 1 (step S7). Then, the CPU 100 records the measurement results, such as the blood pressure values ​​calculated in step S6, in a predetermined area of ​​the memory 24 of the blood pressure measurement device 1 (step S8), and ends the blood pressure measurement process.

[0056] If the wrapping strength is determined to be insufficient in the wrapping strength determination process of step S3, i.e., if the wrapping strength is determined to be loose or tight, pressure control unit 12025 controls valve drive circuit 23 to open exhaust valve 14 and discharge air from air bag 11a of cuff 11 (step S9). CPU 100 then causes display unit 25 to display an error (step S10) and ends the blood pressure measurement process.

[0057] <Example 2> 6 is a block diagram showing an outline of the hardware configuration of a blood pressure measurement device 2 according to Example 2. Components common to those in the blood pressure measurement device 1 according to Example 1 are denoted by common reference numerals, and detailed description thereof will be omitted.

[0058] Blood pressure measurement device 2 includes control valve 16 and control valve drive circuit 28 instead of exhaust valve 14 and valve drive circuit 23, and further includes quick exhaust valve 17 and quick exhaust valve drive circuit 30. Blood pressure measurement device 2 corresponds to the blood pressure measurement device of the present invention. Also, control valve 16 corresponds to the exhaust valve of the present invention.

[0059] Control valve 16 is a valve whose opening degree can be continuously controlled, and control valve drive circuit 28 controls the opening degree of control valve 16 based on a control signal output from CPU 100. Quick exhaust valve 17 is a valve that can rapidly exhaust air by opening the valve, thereby immediately reducing the cuff pressure. Quick exhaust valve drive circuit 30 controls the opening and closing of quick exhaust valve 17 based on a control signal output from CPU 100. In blood pressure measurement device 2, pressure control unit 120 controls the operation of pump drive circuit 22, control valve drive circuit 28, and quick exhaust valve drive circuit 29.

[0060] Since it is difficult to precisely control the cuff pressure using the pressure pump 13, by combining it with a control valve 16 that allows for slow exhaust, constant pressure control at low pressure can be achieved in a shorter time. During constant pressure control, the control valve 16 is controlled to open and close, but during constant speed pressurization control, the control valve 16 is kept closed.

[0061] The overall procedure for blood pressure measurement, including the wrapping strength determination process, is the same as that of the blood pressure measurement device 1 according to the first embodiment, and therefore will not be described again.

[0062] Furthermore, since the blood pressure measurement device 2 is provided with the quick exhaust valve 17, the cuff pressure can be reduced in a short time when the cuff is exhausted, which reduces the burden on the person being measured. [Explanation of symbols]

[0063] 1,2 Blood pressure measuring device 11. Cuff 110 Pressure detection unit 120 Pressure control section 130 Blood pressure calculation unit 150 Winding strength judgment section

Claims

1. a cuff that is wrapped around the part to be measured; a pressure detection unit that detects a cuff pressure in the cuff; a pressure control unit that controls the cuff pressure; a blood pressure calculation unit that performs a blood pressure calculation process to calculate the blood pressure of the subject based on the detected cuff pressure; a wrapping strength determination unit that performs a wrapping strength determination process to determine the wrapping strength of the cuff around the measurement target part; Equipped with The pressure control unit is performing constant pressure control to maintain the cuff pressure at a constant target pressure value from the start of increasing the cuff pressure until the end of the wrapping strength determination process, and performing constant speed inflation control to increase the cuff pressure at a constant speed in order to calculate the blood pressure after the end of the wrapping strength determination process; The winding strength determination unit The blood pressure measuring device is characterized in that the wrapping strength is determined during the constant pressure control.

2. The winding strength determination unit 2. The blood pressure measurement device according to claim 1, wherein the wrapping strength is determined based on a change in the cuff pressure during a determination time period, which is the time period from when the cuff pressure reaches the target pressure value from the initial pressure and stabilizes.

3. The winding strength determination unit The blood pressure measurement device according to claim 2, characterized in that the wrapping strength is determined by comparing the number of times the cuff pressure falls below the target pressure value during the determination time period and the difference from the target pressure value with predetermined threshold values.

4. The winding strength determination unit 4. The blood pressure measurement device according to claim 2, wherein the wrapping strength is determined based on whether the cuff pressure increases or decreases relative to the target pressure value during the determination time period.

5. 3. The blood pressure measurement device according to claim 1, wherein the target pressure value is less than 30 mmHg.

6. The pressure control unit is 3. The blood pressure measurement device according to claim 1, wherein the constant speed inflation control is performed in accordance with a result of the wrapping strength determination process.

7. The pressure control unit is The blood pressure measuring device according to claim 1 or 2, wherein the constant pressure control is performed by PID control.

8. The pressure control unit is 3. The blood pressure measuring device according to claim 1, further comprising a pump for supplying air to the cuff and an exhaust valve for controlling exhaust from the cuff.

9. detecting a cuff pressure in a cuff wrapped around the measurement target part; performing constant pressure control to maintain the cuff pressure at a constant target pressure value; a step of performing a wrapping strength determination process to determine a wrapping strength of the cuff around the measurement target portion during the constant pressure control; a step of performing a constant speed inflation control for increasing the cuff pressure at a constant speed after the wrapping strength determination process is completed; performing a blood pressure calculation process to calculate the blood pressure of the subject based on the cuff pressure during the constant velocity inflation control; A blood pressure measurement method comprising:

10. On the computer, detecting a cuff pressure in a cuff wrapped around the measurement target part; performing constant pressure control to maintain the cuff pressure at a constant target pressure value; a step of performing a wrapping strength determination process to determine a wrapping strength of the cuff around the measurement target portion during the constant pressure control; a step of performing a constant speed inflation control for increasing the cuff pressure at a constant speed after the wrapping strength determination process is completed; performing a blood pressure calculation process to calculate the blood pressure of the subject based on the cuff pressure during the constant velocity inflation control; A blood pressure measurement program characterized by executing the above.

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