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

Abstract

A blood pressure measuring device is provided with: a cuff wound around a portion to be measured; a pressure detection unit that detects cuff pressure; a pressure control unit that controls the cuff pressure; a blood pressure calculation unit that performs a blood pressure calculation process on the basis of the cuff pressure; and a winding strength determination unit that performs a winding strength determination process for determining the winding strength of the cuff, and the pressure control unit performs a constant pressure control for maintaining the cuff pressure at a constant target pressure value from the start of the pressurization of the cuff pressure to the end of the winding strength determination process, and performs a constant pressure control for maintaining the cuff pressure at a constant target pressure value from the start of the pressurization of the cuff pressure to the end of the winding strength determination process. And a constant-speed pressurization control for pressurizing the cuff pressure at a constant speed in order to calculate the blood pressure is performed after the completion of the winding strength determination processing, and the winding strength determination unit determines the winding strength in the pressure constant control.

Description

Technical Field

[0001] This invention relates to a blood pressure measuring device, a blood pressure measuring method, and a blood pressure measuring procedure. Background Technology

[0002] In recent years, the use of measuring devices to measure blood pressure and other information related to an individual's body and health has become increasingly common. The results of these measurements are then recorded and analyzed for health management. As an example of such a measuring device, a blood pressure monitor is known to have a cuff attached to the upper arm, wrist, or other measuring area of ​​the subject, and includes a function to determine the strength of the cuff's wrapping (see Patent Document 1).

[0003] In the blood pressure monitor disclosed in Patent Document 1, after the cuff is put on, a constant voltage is applied to the pump and driven during the initial pressurization. The cuff winding strength is determined based on the cuff pressure-pressurization time characteristics (cuff pressure curve) from the initial pressure to the end of the initial pressurization. Then, blood pressure calculation is performed.

[0004] However, in such constant voltage drive, in order to ensure the time required for determining the cuff winding strength, the initial pressure level cannot be too low. Therefore, the pressure pulse wave needs to be acquired immediately after the cuff winding strength is determined for blood pressure calculation. Thus, noise generated during the control switching timing may have an adverse effect on the pressure pulse wave.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent No. 5408142 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In view of the prior art as described above, the object of the present invention is to provide a technique that can suppress the influence of noise on the switching timing of control from determining the cuff winding strength to calculating blood pressure.

[0010] Solution for solving the problem

[0011] To solve the above-mentioned technical problems, the present invention provides a blood pressure measuring device, characterized in that it comprises:

[0012] The cuff is wrapped around the part being measured.

[0013] The pressure detection unit detects the cuff pressure inside the cuff.

[0014] The pressure control unit controls the pressure of the cuff;

[0015] The blood pressure calculation unit performs blood pressure calculation processing to calculate the subject's blood pressure based on the detected cuff pressure; and

[0016] The winding strength determination unit performs winding strength determination processing to determine the winding strength of the cuff to the measured part.

[0017] The pressure control unit performs constant pressure control to maintain the cuff pressure at a constant target pressure value from the start of cuff pressure application to the end of the winding strength determination process. Furthermore, after the winding strength determination process is completed, it performs constant-rate pressurization control to apply constant pressure to the cuff at a constant speed for calculating the blood pressure.

[0018] The winding strength determination unit determines the winding strength during the constant pressure control.

[0019] Therefore, in the constant pressure control for determining the cuff winding strength, the control is switched from maintaining the cuff pressure at a constant target pressure value to constant rate pressurization control for blood pressure calculation, thus suppressing the influence of switching timing noise on blood pressure calculation.

[0020] Alternatively, in this invention, the winding strength determination unit may determine the winding strength based on the change in the cuff pressure during the determination target time, where the determination target time is the time from when the cuff pressure reaches and stabilizes at the target pressure value from the initial pressure.

[0021] Therefore, the winding strength can be determined by the amount of pressure applied to the measured part by the cuff pressure when the cuff is wound around it.

[0022] Alternatively, in this invention, the winding strength determination unit may determine the winding strength by comparing the number of times the cuff pressure is less than the target pressure value within the determination period and the difference between the cuff pressure and the target pressure value with a predetermined threshold.

[0023] Therefore, as a measure of the winding strength, it is possible to determine whether the pressure exerted on the measured part by the cuff when the cuff is wound around it is less than a reasonable value.

[0024] Alternatively, in this invention, the winding strength determination unit may determine the winding strength based on whether the cuff pressure increases or decreases relative to the target pressure value within the determination period.

[0025] Therefore, as a measure of the winding strength, it is possible to determine whether the pressure exerted on the measured part by the cuff when the cuff is wound around it is greater than a reasonable value.

[0026] In addition, in this invention, the target pressure value may be less than 30 mmHg.

[0027] Therefore, by using a cuff pressure of less than 30 mmHg as the target pressure value for constant pressure control, it is possible to start from a state of lower cuff pressure for isokinetic pressor control used in blood pressure calculation.

[0028] Alternatively, in this invention, the pressure control unit may perform the constant speed pressurization control based on the result of the winding strength determination process.

[0029] Therefore, under appropriate winding strength, constant-rate pressurization control can be performed to achieve high-precision blood pressure calculation. Furthermore, if the winding strength is inappropriate, air can be expelled from the cuff without constant-rate pressurization control, thus reducing the burden on the person being measured.

[0030] Alternatively, in this invention, the pressure control unit may perform constant pressure control via PID control.

[0031] Alternatively, in this invention, the pressure control unit may control the pump that supplies air to the cuff and the exhaust valve that controls the exhaust from the cuff.

[0032] Furthermore, the present invention is a method for measuring blood pressure, characterized by comprising the following steps:

[0033] Detect the cuff pressure wrapped around the cuff of the part being measured;

[0034] Pressure constant control is performed to maintain the cuff pressure at a constant target pressure value.

[0035] In the constant pressure control, a winding strength determination process is performed to determine the winding strength of the cuff to the measured part.

[0036] After the winding strength determination process is completed, constant-speed pressurization control is performed to apply pressure to the cuff at a constant speed; and

[0037] In the constant rate pressurization control, blood pressure calculation processing is performed to calculate the blood pressure of the subject based on the cuff pressure.

[0038] Therefore, in the constant pressure control for determining the cuff winding strength, the control is switched from maintaining the cuff pressure at a constant target pressure value to constant rate pressurization control for blood pressure calculation, thus suppressing the influence of switching timing noise on blood pressure calculation.

[0039] Furthermore, the present invention is a blood pressure measurement program, characterized in that the blood pressure measurement program causes a computer to perform the following steps:

[0040] Detect the cuff pressure wrapped around the cuff of the part being measured;

[0041] Pressure constant control is performed to maintain the cuff pressure at a constant target pressure value.

[0042] In the constant pressure control, a winding strength determination process is performed to determine the winding strength of the cuff to the measured part.

[0043] After the winding strength determination process is completed, constant-speed pressurization control is performed to apply pressure to the cuff at a constant speed; and

[0044] In the constant rate pressurization control, blood pressure calculation processing is performed to calculate the blood pressure of the subject based on the cuff pressure.

[0045] Therefore, in the constant pressure control for determining the cuff winding strength, the control is switched from maintaining the cuff pressure at a constant target pressure value to constant rate pressurization control for blood pressure calculation, thus suppressing the influence of switching timing noise on blood pressure calculation.

[0046] Invention Effects

[0047] According to the present invention, the influence of noise on the switching timing from the determination of the cuff winding strength to the control of blood pressure calculation can be suppressed. Attached Figure Description

[0048] Figure 1 This is a schematic diagram showing the hardware configuration of the blood pressure measuring device of Example 1.

[0049] Figure 2 This is a functional block diagram of the blood pressure measuring device in Example 1.

[0050] Figure 3 This is a flowchart illustrating the overall processing procedure of the blood pressure measuring device in Example 1.

[0051] Figure 4 This is a graph showing the time variation of cuff pressure and pressure pulse wave when the blood pressure measuring device of Example 1 is used.

[0052] Figure 5 This is a flowchart illustrating the process of determining the winding strength of the blood pressure measuring device in Example 1.

[0053] Figure 6 This is a graph showing the variation pattern of cuff pressure according to the winding strength of the blood pressure measuring device of Example 1.

[0054] Figure 7 This is a schematic diagram showing the hardware configuration of the blood pressure measuring device of Example 2. Detailed Implementation

[0055] Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0056] <Example 1>

[0057] Hereinafter, an example of an embodiment of the present invention will be described. Unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of the constituent components described in this embodiment are not intended to limit the scope of the present invention.

[0058] (Device configuration)

[0059] Figure 1 This is a schematic diagram of the hardware configuration of the blood pressure measuring device 1 in this embodiment.

[0060] The blood pressure measuring device 1 includes a cuff 11, a pressure sensor 12, a pressurizing pump 13, an exhaust valve 14, an air tube 15, an oscillation 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 measuring device 1 corresponds to the blood pressure measuring device of the present invention. The cuff 11, the pressurizing pump 13, and the exhaust valve 14 correspond to the cuff, pump, and exhaust valve of the present invention, respectively.

[0061] The cuff 11 includes an air bag 11a containing air. The cuff 11 is provided with the following via an air tube 15: a pressure sensor 12 for detecting the pressure inside the air bag 11a (hereinafter referred to as "cuff pressure"); a pressurization pump 13 for supplying air to the air bag 11a; and an exhaust valve 14 for maintaining the pressure inside the air bag 11a or expelling air from the air bag 11a and is openable and closable.

[0062] Furthermore, the blood pressure measuring device 1 includes: a CPU (Central Processing Unit) 100 for controlling various parts of the device; a memory 24 for storing programs executed for the winding strength determination processing and blood pressure measurement processing described later, as well as data such as blood pressure measurement results; a display unit 25 for displaying various information such as winding strength determination results and blood pressure measurement results; an operation switch 26 for inputting various instructions for measurement; and a power supply 27 for supplying power to the CPU and other parts of the device.

[0063] Furthermore, the oscillation circuit 21 outputs a signal with 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 pressurization pump 13 based on the 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.

[0064] Figure 2 This is a functional block diagram of the blood pressure measuring device 1.

[0065] CPU100 includes a pressure detection unit 110, a pressure control unit 120, a blood pressure calculation unit 130, a condition judgment unit 140, and a winding strength judgment unit 150. The pressure detection unit 110, the pressure control unit 120, the blood pressure calculation unit 130, and the winding strength judgment unit 150 respectively correspond to the pressure detection unit, the pressure control unit, the blood pressure calculation unit, and the winding strength judgment unit of the present invention.

[0066] The output signal of the oscillation 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 includes: an HPF unit, which extracts and outputs a pressure pulse wave signal by performing HPF (High Pass Filter) processing on the pressure value signal; and an LPF unit, which extracts and outputs the absolute pressure value signal by performing LPF (Low Pass Filter) processing on the pressure value signal.

[0067] The pressure control unit 120 controls the cuff pressure of the cuff 11 by controlling the operation of the pump drive circuit 22 and the valve drive circuit 23.

[0068] The blood pressure calculation unit 130 inputs the pressure pulse wave signal extracted by the HPF unit of the pressure detection unit 110, processes the input pressure pulse wave signal according to the oscillometric method, and calculates the diastolic blood pressure (lowest blood pressure) and systolic blood pressure (highest blood pressure).

[0069] The LPF section of the pressure detection unit 110 inputs a cuff pressure signal, representing the cuff pressure detected according to a timing sequence, to the condition determination unit 140. Based on the cuff pressure signal input according to the timing sequence, the condition determination unit 141 determines whether the conditions (determination conditions) for determining the winding strength are met.

[0070] In the winding strength determination unit 150, a cuff pressure signal representing the cuff pressure detected according to a timing sequence is input from the LPF unit of the pressure detection unit 110, and the input cuff pressure signal is stored in a predetermined area of ​​the memory 24. The winding strength determination unit 150 waits for the determination conditions to be met, and performs the winding strength determination described later based on the cuff pressure signal read from the memory 24.

[0071] (Methods for measuring blood pressure)

[0072] Figure 3 This is a flowchart illustrating the overall process of blood pressure measurement performed by the blood pressure measuring device 1. Figure 3The entire process of blood pressure measurement shown is pre-programmed and stored in a designated area of ​​memory 24. The CPU 100 reads the program from memory 24 and executes it. The program can be stored on a computer-readable storage medium and read from that storage medium by the blood pressure measuring device 1. Figure 4 It is a graph showing the time change of the pressure pulse wave detected during blood pressure measurement and the cuff pressure, on the same time axis.

[0073] When measuring blood pressure, the subject wraps the cuff 11 around the upper arm, wrist, or other areas to be measured beforehand. Furthermore, the procedure for the subject to perform pre-defined settings via the operating switch 26 and instruct the start of blood pressure measurement will be explained. It should be noted that upon receiving the instruction to start blood pressure measurement, the blood pressure measuring device 1 performs pre-defined initializations such as opening the exhaust valve 14 and setting the cuff pressure to atmospheric pressure (initial pressure).

[0074] When blood pressure measurement begins, the pressure control unit 120 initiates constant pressure control (step S1). At this time, the pressure control unit 120 uses the initial pressure at the end of the initial pressurization as the target pressure value and controls the pump drive circuit 22 to keep the cuff pressure detected by the pressure sensor 12 constant (referred to as "constant pressure control"). This constant pressure control can be performed, for example, by PID control, but the control method is not limited to this.

[0075] In the condition determination unit 140, the cuff pressure detected by the pressure sensor 12 is monitored, and it is determined whether the cuff pressure has reached and stabilized at the target pressure value (step S2). Whether the cuff pressure is stable can be determined, for example, based on whether the deviation between the cuff pressure and the target pressure value converges within a range of ±5%, but the determination criteria are not limited to this.

[0076] In step S2, if it is determined that the cuff pressure has not reached the target pressure value or is unstable, step S2 is repeated, and the condition judgment unit 140 continues to monitor the cuff pressure. Until step S3 is entered, the sampled cuff pressure and the sampling time information are stored in a designated area of ​​the memory 24 in a correlated manner.

[0077] In step S2, if the condition determination unit 140 determines that the cuff pressure has reached and stabilized at the target pressure value, the winding strength determination unit 150 executes the following based on the cuff pressure time change information stored in the memory 24: Figure 5 The winding strength determination process is shown in step S3. Thus, the winding strength determination process is performed under constant pressure control.

[0078] In the winding strength determination process of step S3, the winding strength determination unit 150 determines the winding strength by observing the variation pattern of the cuff pressure during the time it takes for the cuff pressure in the constant pressure control to reach and stabilize at the target pressure value from the initial pressure. Here, it is determined whether the winding strength of the cuff 11 falls into one of the three categories: loose winding, proper winding, or tight winding. When the cuff 11 is wound around the upper arm or other parts to be measured and formed into a cylindrical shape, if the circumference of the cylinder is approximately equal to the circumference of the parts to be measured, the pressure applied to the parts to be measured by the cuff 11 is at a reasonable level for blood pressure measurement, and this state is defined as proper winding. If the circumference of the cylinder formed by the cuff 11 is shorter than the circumference of the parts to be measured, the cuff 11 is tightly wound around the parts to be measured, and the pressure applied to the parts to be measured by the cuff 11 becomes higher than the reasonable level, and this state is defined as tight winding. Furthermore, when the circumference of the cylinder formed by the cuff 11 is longer than the circumference of the part being measured, the cuff 11 is loosely wound around the part being measured, and the pressure applied to the part being measured by the cuff 11 becomes lower than a reasonable level. Therefore, this state is defined as loose winding. Here, in constant pressure control, the time from when the cuff pressure reaches and stabilizes at the target pressure value (in...) Figure 4 The time P1 up to Tc corresponds to the determination time of this invention. Time Tc corresponds to the end of the winding strength determination process.

[0079] Figure 6 It is a graph showing the variation pattern of cuff pressure when the winding strength is judged as loose winding, proper winding, and tight winding. Figure 6 Will Figure 4 The variation in cuff pressure is magnified by the area enclosed by the dashed line. In a loosely wound state, the cuff pressure rises slowly upon pressurization, reaching the target pressure value after a prolonged period significantly below it (a so-called "downward rush"). In a tightly wound state, the cuff pressure rises sharply immediately after pressurization begins, exceeding the target pressure value. After this so-called "overshoot" state, the pressure fluctuates around the target value as it reaches it. In a properly wound state, although the cuff pressure rises with pressurization, it does not exceed the target pressure value, reaching it after rapidly approaching it.

[0080] The winding strength determination unit 150 determines whether the number and amount of times the cuff pressure is less than the target pressure value from the initial pressure to the target pressure value are greater than a predetermined threshold (step S31). Here, the amount less than the target pressure value refers to the magnitude of the difference between the target pressure value and the cuff pressure.

[0081] In step S31, if it is determined that the number and amount of times the cuff pressure is less than the target pressure value until the cuff pressure reaches the target pressure value are greater than a specified threshold, then the winding strength is determined to be loose winding (step S32).

[0082] In step S31, if it is determined that the number and amount of times the cuff pressure is less than the target pressure value until the cuff pressure reaches the target pressure value are below a predetermined threshold, the winding strength determination unit 150 determines whether the pressure value increases or decreases relative to the target pressure value (step S33).

[0083] In step S33, if it is determined that the pressure value increases or decreases relative to the target pressure value until the cuff pressure reaches the target pressure value, it is determined that the winding strength is tight winding (step S34).

[0084] In step S33, if the cuff pressure does not increase or decrease relative to the target pressure value until the cuff pressure reaches the target pressure value, it is determined that the winding strength is appropriate (step S35).

[0085] In the winding strength determination in step S3, if the winding is deemed appropriate, the initial pressurization based on constant pressure control ends, and the pressure control unit 120 begins to control the pump drive circuit 22 to increase the cuff pressure at a constant rate (referred to as "constant rate pressurization control") (step S5). Constant rate pressurization control in... Figure 4 P2 will execute after Tc.

[0086] The initial pressurization end pressure value (target pressure value) is set to be about 10 mmHg lower than the typical value of 30 mmHg in the previous constant voltage drive. In this way, by setting the initial pressurization end pressure value low, the pressure pulse wave for blood pressure measurement can be obtained from a lower pressure after the winding strength determination process is completed.

[0087] Furthermore, at the end of the winding strength determination process in step S3, the pump voltage (drive voltage of pump drive circuit 22) maintaining the equilibrium state under constant pressure control switches from this state to constant-rate pressurization control, and begins to acquire pressure pulse waves for blood pressure measurement. This prevents sudden changes in pressurization rate, thus suppressing the influence of noise in the control switching timing and acquiring clear pressure pulse wave changes.

[0088] The blood pressure calculation unit 130 acquires the pressure pulse wave for blood pressure measurement from the HPF unit of the pressure detection unit 110 through constant rate pressurization control, and performs blood pressure calculation processing (step S6) to calculate blood pressure values ​​such as systolic blood pressure and diastolic blood pressure using the oscillometric method.

[0089] The CPU 100 displays the measurement results, such as the blood pressure value calculated in step S6, on the display unit 25 of the blood pressure measuring device 1 (step S7). Then, the CPU 100 records the measurement results, such as the blood pressure value calculated in step S6, in a designated area of ​​the memory 24 of the blood pressure measuring device 1 (step S8), and ends the blood pressure measurement process.

[0090] In the winding strength determination process of step S3, if the winding strength is determined to be inappropriate, i.e., if it is determined to be loose winding or tight winding, the pressure control unit 120 controls the valve drive circuit 23 to open the exhaust valve 14, releasing air from the air bag 11a of the cuff 11 (step S9). Then, the CPU 100 causes the display unit 25 to display an error (step S10), ending the blood pressure measurement process.

[0091] <Example 2>

[0092] Figure 7 This is a schematic block diagram showing the hardware configuration of the blood pressure measuring device 2 of Embodiment 2. For configurations identical to those of the blood pressure measuring device 1 of Embodiment 1, the same reference numerals are used, and detailed descriptions are omitted.

[0093] The blood pressure measuring device 2 replaces the exhaust valve 14 and valve drive circuit 23 with a control valve 16 and a control valve drive circuit 28, and also includes a rapid exhaust valve 17 and a rapid exhaust valve drive circuit 30. The blood pressure measuring device 2 corresponds to the blood pressure measuring device of the present invention. Furthermore, the control valve 16 corresponds to the exhaust valve of the present invention.

[0094] Control valve 16 is a valve whose opening degree can be continuously controlled. Control valve drive circuit 28 controls the opening degree of control valve 16 through a control signal output from CPU 100. Quick exhaust valve 17 is a valve that can quickly release 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 through a control signal output from CPU 100. In blood pressure measuring 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.

[0095] Since the pressure pump 13 is difficult to control precisely with the cuff pressure, a control valve 16 that allows for slow-speed venting can be combined to achieve constant pressure control at low pressure in a shorter time. The control valve 16 is opened and closed during constant pressure control, but closed during constant-speed pressurization control.

[0096] The overall processing procedure for blood pressure measurement, including the winding strength determination process, is the same as that of the blood pressure measuring device 1 in Example 1, so the description is omitted.

[0097] Furthermore, the blood pressure measuring device 2 is equipped with a quick exhaust valve 17, which can reduce the cuff pressure in a short time when venting, thus reducing the burden on the person being measured.

[0098] Explanation of reference numerals in the attached figures

[0099] 1, 2: Blood pressure measuring device;

[0100] 11: Cuffs;

[0101] 110: Pressure Testing Department;

[0102] 120: Pressure Control Unit;

[0103] 130: Blood Pressure Calculation Department;

[0104] 150: Winding strength determination section.

Claims

1. A blood pressure measuring apparatus characterized by comprising: Possessing: a cuff wound around a measurement target; 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 for calculating a blood pressure of the measurement target based on the detected cuff pressure; and a winding strength determination unit that performs a winding strength determination process for determining a winding strength of the cuff on the measurement target, the pressure control unit performs a pressure constant control for maintaining the cuff pressure at a constant target pressure value from the start of the cuff pressure increase to the end of the winding strength determination process, and performs a constant-rate pressure increase control for increasing the cuff pressure at a constant rate for the calculation of the blood pressure after the winding strength determination process ends, the winding strength determination unit determines the winding strength in the pressure constant control.

2. The blood pressure measurement device according to claim 1, wherein the winding strength determination unit determines the winding strength based on a change in the cuff pressure in a determination target time from when the cuff pressure reaches and stabilizes at the target pressure value.

3. The blood pressure measurement device according to claim 2, wherein the winding strength determination unit determines the winding strength by comparing the number of times the cuff pressure is less than the target pressure value and the difference between the cuff pressure and the target pressure value in the determination target time with predetermined threshold values, respectively.

4. The blood pressure measurement device according to claim 2 or 3, wherein the winding strength determination unit determines the winding strength based on whether the cuff pressure increases or decreases with respect to the target pressure value in the determination target time.

5. The blood pressure measurement device according to claim 1 or 2, wherein the target pressure value is less than 30 mmHg.

6. The blood pressure measurement device according to claim 1 or 2, wherein the pressure control unit performs the constant-rate pressure increase control according to the result of the winding strength determination process.

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

8. The blood pressure measurement device according to claim 1 or 2, wherein the pressure control unit controls a pump that supplies air to the cuff and an exhaust valve that controls exhaust from the cuff. Possessing:

9. A method of blood pressure measurement, characterized by, detecting a cuff pressure in a cuff wound around a measurement target; performing a pressure constant control for maintaining the cuff pressure at a constant target pressure value; performing a winding strength determination process for determining a winding strength of the cuff on the measurement target in the pressure constant control; performing a constant-rate pressure increase control for increasing the cuff pressure at a constant rate after the winding strength determination process ends; and performing a blood pressure calculation process for calculating a blood pressure of the measurement target based on the cuff pressure in the constant-rate pressure increase control. The blood pressure measurement program causes a computer to perform: detecting a cuff pressure in a cuff wound around a measurement target; 10. A blood pressure measurement program characterized by comprising: ​ ​ performing pressure constant control in which the cuff pressure is to be maintained at a constant target pressure value; in the pressure constant control, performing a winding strength determination process of determining a winding strength of the cuff on the measurement portion; after the winding strength determination process ends, performing constant-rate pressurization control in which the cuff pressure is pressurized at a constant rate; and in the constant-rate pressurization control, performing a blood pressure calculation process of calculating a blood pressure of the subject based on the cuff pressure.

Images