JP6676915B2 - Blood pressure measurement device, blood pressure measurement system, and blood pressure measurement method - Google Patents

Description

  The present disclosure relates to a blood pressure measurement device, a blood pressure measurement system, and a blood pressure measurement method.

  Hemodialysis needs to be performed while carefully checking the condition of the patient. For example, during hemodialysis, it is known that a patient's blood pressure gradually decreases as the circulating blood volume decreases. Therefore, hemodialysis is performed using a blood pressure measurement device while appropriately checking whether the state of decrease in blood pressure is within an appropriate range. Also, a blood pressure measurement device capable of continuously measuring the blood pressure of a patient in hemodialysis is known (for example, see Patent Document 1).

International Publication No. 2004/069049

  In hemodialysis therapy, the patient is kept in a bed or chair, for example, for 3 to 4 hours, and the patient does not sit still, such as eating a meal during hemodialysis. Therefore, when blood pressure measurement is continuously performed on a dialysis patient, unlike a short-time blood pressure measurement performed in a stationary state, the measurement condition changes due to movement of the patient, and accurate measurement is performed. In some cases, the blood pressure value cannot be obtained.

  Therefore, an object of the present disclosure is to solve the above-described conventional problems, and to suppress a change in measurement conditions, to obtain a more accurate blood pressure value, a blood pressure measurement device, a blood pressure measurement system, and a blood pressure measurement. It is to provide a method.

  In order to achieve the above object, a blood pressure measurement device, a blood pressure measurement system, and a blood pressure measurement method according to the present disclosure are configured as follows.

  According to one aspect of the present disclosure, a strain sensor disposed on skin in the vicinity of a blood vessel, a pressure sensor disposed on the skin at a position spaced apart from the strain sensor, and a strain sensor mounted on the patient. A mounting device that arranges and fixes the sensor and the pressure sensor with respect to the skin surface, a pressure adjustment unit that is disposed inside the mounting device and adjusts the pressing pressure of the strain sensor against the skin surface, and is detected by the pressure sensor. A pressure control device that controls the pressure adjustment unit such that the pressure of the strain sensor against the skin surface falls within a set range based on the pressure information, and a blood pressure calculation that calculates a blood pressure value based on information detected by the strain sensor. And a blood pressure measurement device including the device.

  Further, the blood pressure measurement device includes a blood pressure measurement device, and a calibration blood pressure measurement device that is mounted on a patient and measures a blood pressure value as reference information for calibrating blood pressure value measurement by the blood pressure measurement device. The blood pressure calculation device of the device provides a blood pressure measurement system that performs calibration of blood pressure value calculation based on information detected by a strain sensor based on a blood pressure value input from a calibration blood pressure measurement device.

  Further, a strain sensor disposed on the skin near the blood vessel, a pressure sensor disposed on the skin at a position separated from the strain sensor, and a pressure adjustment unit disposed separately from the strain sensor and the pressure sensor. The fixing device is attached to the patient so as to be fixed, and based on the pressure information detected by the pressure sensor, the pressure control unit keeps the pressing pressure of the strain sensor against the skin surface within the set range while maintaining the strain. Provided is a blood pressure measurement method for calculating a blood pressure value based on information detected by a sensor.

  According to the blood pressure measurement device, the blood pressure measurement system, and the blood pressure measurement method of the present disclosure, it is possible to acquire a more accurate blood pressure value while suppressing a change in measurement conditions.

External view of blood pressure measurement device according to one embodiment of the present disclosure (attached to arm) Sectional view (including control block diagram) of the blood pressure measurement device according to the embodiment Graph of an output example of a strain sensor in the blood pressure measurement device according to the embodiment

  The blood pressure measurement device according to the first aspect of the present disclosure is mounted on a patient with a strain sensor disposed on the skin near a blood vessel, a pressure sensor disposed on the skin at a position separated from the strain sensor, and a patient. A mounting device that disposes and fixes the strain sensor and the pressure sensor to the skin surface, a pressure adjustment unit that is disposed inside the mounting device and adjusts a pressing pressure of the strain sensor against the skin surface, and is detected by the pressure sensor. Based on the obtained pressure information, a blood pressure value is calculated based on information detected by the pressure control device and the strain sensor so that the pressing pressure of the strain sensor against the skin surface falls within a set range. And a blood pressure calculating device.

  A blood pressure measurement device according to a second aspect of the present disclosure is the blood pressure measurement device according to the first aspect, wherein the pressure adjustment unit is disposed inside the mounting device and away from the strain sensor and the pressure sensor.

  A blood pressure measurement device according to a third aspect of the present disclosure is the blood pressure measurement device according to the first or second aspect, wherein the blood pressure calculation device calculates a periodic change in pressure as a continuous waveform based on information detected by the strain sensor, The blood pressure value is continuously calculated based on the continuous waveform.

  A blood pressure measurement device according to a fourth aspect of the present disclosure is the blood pressure measurement device according to the third aspect, wherein the blood pressure calculation device calculates a maximum pressure from a maximum value of a continuous waveform and calculates a minimum pressure from a minimum value of the continuous waveform. It is.

  A blood pressure measurement device according to a fifth aspect of the present disclosure is the blood pressure measurement device according to any one of the first to fourth aspects, wherein the wearing device is a wearing band worn around a patient's arm.

  A blood pressure measurement system according to a sixth aspect of the present disclosure includes a blood pressure measurement device according to any one of the first to fifth aspects, and a reference that is mounted on a patient and performs calibration of blood pressure measurement by the blood pressure measurement device. A blood pressure measurement device for calibration that measures a blood pressure value as information, the blood pressure calculation device of the blood pressure measurement device detects the blood pressure value input from the calibration blood pressure measurement device based on the information detected by the strain sensor. The calibration of the blood pressure value calculation is performed based on the calibration.

  A blood pressure measurement system according to a seventh aspect of the present disclosure is the blood pressure measurement system according to the sixth aspect, wherein the calibration blood pressure measurement device is a device that performs a blood pressure measurement based on an oscillometric method or a Livarotch-Korotkov method. .

  The blood pressure measurement system according to an eighth aspect of the present disclosure is the blood pressure measurement system according to the sixth or seventh aspect, wherein the blood pressure value as reference information is periodically transmitted from the blood pressure measurement device for calibration to the blood pressure calculation device of the blood pressure measurement device. The calibration is periodically performed in the blood pressure calculation device after being input.

  A blood pressure measurement method according to a ninth aspect of the present disclosure includes a strain sensor disposed on skin in the vicinity of a blood vessel, a pressure sensor disposed on the skin at a position separated from the strain sensor, and a strain sensor and a pressure sensor. The mounting device is mounted on the patient so as to fix the pressure adjusting unit disposed so as to cover, and based on the pressure information detected by the pressure sensor, the pressure control unit presses the strain sensor against the skin surface. The blood pressure value is calculated based on information detected by the strain sensor while maintaining the pressure within the set range.

  The blood pressure measurement method according to a tenth aspect of the present disclosure is the blood pressure measurement method according to the ninth aspect, wherein in the calculation of the blood pressure value, the periodic fluctuation of the pressure is calculated as a continuous waveform based on information detected by the strain sensor. While continuously calculating the blood pressure value based on the continuous waveform obtained, while performing continuous measurement of the blood pressure value, using a blood pressure measurement device for calibration, by measuring the blood pressure value as reference information, Based on the measured blood pressure value, calibration of blood pressure value calculation based on information detected by the strain sensor is performed.

  Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings.

  FIG. 1 shows an external view of a state in which the blood pressure measurement device 10 according to an embodiment of the present disclosure is mounted on the arm 1 of a patient, and FIG. 2 shows a cross-sectional view of the blood pressure measurement device 10 including a control block diagram. .

  As shown in FIGS. 1 and 2, the blood pressure measurement device 10 of the present embodiment includes a strain sensor 11, a pressure sensor 12, a mounting band 13, a pressure adjustment unit 14, and a controller 20.

  The strain sensor 11 is a sensor that is arranged on the skin near the blood vessel 2 in the patient's arm 1 and detects a periodic pressure change transmitted from the blood vessel 2 as a strain amount. As such a strain sensor 11, for example, a semiconductor strain sensor having a built-in piezoresistor that changes the resistance value of a circuit when a strain is applied may be used. The strain sensor 11 may be any sensor that can detect a periodic pressure change transmitted from the blood vessel 2 as a strain amount, and may employ various other types of strain sensors. Further, it is preferable to use a small sensor as the strain sensor 11, and for example, a small sensor of about 5 mm square to 2 cm square may be used. Further, in order to perform blood pressure measurement with higher accuracy, for example, a strain sensor having a built-in amplifier and high sensitivity may be used.

  The pressure sensor 12 is disposed on the skin at a position separated from the strain sensor 11 on the arm 1 of the patient, and is a sensor that detects a pressing pressure of the strain sensor 11 against the skin surface, as described later. As such a pressure sensor 12, any sensor that can detect the pressing pressure of the strain sensor 11 against the skin surface may be used, and various types of sensors may be employed. Further, it is preferable that the pressure sensor 12 is arranged at a position away from the strain sensor 11 so as not to be affected as much as possible by the pressure fluctuation of the blood vessel 2 detected by the strain sensor 11.

  The wearing band 13 is wound around the patient's arm 1 and is detachably worn. By attaching the wearing band 13 to the patient's arm 1, the strain sensor 11 and the pressure sensor 12 can be arranged and fixed at desired positions on the skin surface of the patient's arm 1. The wearing band 13 is preferably made of a material or a structure that is flexible enough to be wound around the arm 1. The mounting band 13 may be made of, for example, cloth, rubber, synthetic resin, or the like. Further, at both ends of the mounting band 13, joint portions that can be releasably joined to each other are provided, and for example, a hook-and-loop fastener may be used as the joint portion. From the viewpoint of performing highly accurate detection by the strain sensor 11, it is preferable that the mounting band 13 be made of a material having lower elasticity.

  The pressure adjustment unit 14 includes an airbag 15 in which air is sealed, an air adjustment mechanism 16 that adjusts the amount of air sealed in the airbag 15, and an air tube 17 that connects the airbag 15 and the air adjustment mechanism 16. And

  The airbag 15 is arranged inside the mounting band 13 and adjusts the tightening pressure of the mounting band 13 by expanding and contracting according to the amount of air sealed inside. In the present embodiment, airbag 15 is arranged at a position separated from strain sensor 11 and pressure sensor 12. That is, the airbag 15 is disposed at a position apart from the inside of the mounting band 13 without directly contacting the strain sensor 11 and the pressure sensor 12. The airbag 15 may be disposed so as to cover the strain sensor 11 and the pressure sensor 12 or to cover one of the strain sensor 11 and the pressure sensor 12. However, since the airbag 15 is separated from the sensors 11 and 12 as in the present embodiment, a direct effect on the sensors 11 and 12 due to expansion and contraction of the airbag 15 is suppressed. Detection accuracy can be improved.

  The air adjustment mechanism 16 includes a pump that supplies air to the airbag 15 through the air tube 17 and a discharge valve that discharges air sealed in the airbag 15 through the air tube 17. The amount of air enclosed in the airbag 15 is adjusted by controlling the operation of the pump and the discharge valve in the air adjustment mechanism 16. The tightening pressure of the mounting band 13 can be adjusted by adjusting the amount of air enclosed in the airbag 15. As a result, the pressing force of the strain sensor 11 against the skin surface and the pressing pressure of the pressure sensor 12 can be adjusted. Note that the air adjustment mechanism 16 only needs to have a function of adjusting the amount of air charged in the airbag 15 and may be configured by components other than the pump and the exhaust valve. Further, the case where the pressure adjusting unit 14 uses air as the pressure medium has been described as an example, but the pressure medium may be another fluid (including liquid and gas).

  The airbag 15, the strain sensor 11, and the pressure sensor 12 may be attached to the inside of the mounting band 13 in advance. In this case, by winding the wearing band 13 around the arm 1, the airbag 15, the strain sensor 11, and the pressure sensor 12 can be arranged at desired positions on the skin surface. If the size of the air adjustment mechanism 16 can be reduced, the air adjustment mechanism 16 may be arranged inside the mounting band 13.

  The controller 20 performs various controls related to blood pressure measurement in the blood pressure measurement device 10, and includes a pressure control device 21 and a blood pressure calculation device 22.

  The pressure control device 21 receives a signal as pressure information detected by the pressure sensor 12 and calculates the pressure in the wearing band 13 with respect to the skin surface based on the input signal. The pressure control device 21 includes, for example, a conversion circuit that converts a signal from the pressure sensor 12 into digital data, an arithmetic circuit that performs arithmetic processing on the digital data, and calculates the pressure in the mounting band 13. Further, the pressure control device 21 has a storage circuit for storing signal data, processing data, and setting data, and a display device for displaying the calculated pressure.

  Further, in the pressure control device 21, a set pressure range (set range) is stored in advance in a storage circuit, and the pressure control device 21 is set so that the calculated pressure in the mounting band 13 falls within the set pressure range. Controls the air adjustment mechanism 16. That is, when the calculated pressure is higher than the set pressure range, the pressure control device 21 controls the air adjusting mechanism 16 to discharge the air in the airbag 15, and the pressure in the mounting band 13 ( (Clamping pressure). On the other hand, when the calculated pressure is lower than the set pressure range, the pressure control device 21 controls the air adjustment mechanism 16 to supply air into the airbag 15 and reduce the pressure in the mounting band 13. To raise.

  In the blood pressure measurement device 10 of the present embodiment, a configuration is adopted in which the pressure sensor 12 and the strain sensor 11 are both arranged on the skin surface by the wearing band 13. Therefore, the pressure of the wearing band 13 detected by the pressure sensor 12 can be regarded as approximating the pressing pressure of the strain sensor 11 against the skin surface. In addition, it is preferable to set the pressure at which the strain sensor 11 is pressed against the skin surface to a pressure equal to or higher than the maximum pressure of the blood pressure. With this setting, the strain sensor 11 can be reliably fixed to the skin surface, and pulsation transmitted from the blood vessel 2 can be accurately detected as strain. As a set pressure range preset in the pressure control device 21, a certain reference value may be set, and a predetermined allowable range may be provided to set the range. Alternatively, an upper limit value and a lower limit value may be set. Range may be set.

  The pressing pressure of the strain sensor 11 may be equal to or higher than the maximum pressure of the blood pressure. However, it is not preferable that the blood pressure of the patient continues to be excessively compressed in the continuous measurement of the blood pressure and the blood flow is hindered. Therefore, it is preferable to keep the pressing pressure within the range of systolic blood pressure + 0 mmHg to 20 mmHg. However, if the pressing pressure is less than the systolic blood pressure, the strain sensor 11 itself is lifted for the blood pressure value exceeding the pressing pressure, so that the strain cannot be received and a value lower than the actual value appears. is necessary.

  The blood pressure calculation device 22 calculates the periodic fluctuation of the pressure as a continuous waveform based on the information detected by the strain sensor 11, and continuously calculates the blood pressure value based on the calculated continuous waveform. The blood pressure calculation device 22 includes, for example, a drive circuit that drives the strain sensor 11 and a control circuit that receives a signal from the strain sensor 11 and processes the received signal to calculate a blood pressure value. The control circuit includes, for example, a conversion circuit that converts a signal from the strain sensor 11 into digital data, an arithmetic circuit that performs arithmetic processing on digital data to calculate a blood pressure value, and a storage circuit that stores signal data and processed data. Have. Furthermore, the blood pressure calculation device 22 may include a display device that displays the calculated blood pressure value.

  A blood pressure measurement method for measuring the blood pressure of a patient using the blood pressure measurement device 10 according to the present embodiment having such a configuration will be described.

  First, in the arm 1 of the patient, the wearing band 13 is placed on the arm so that the strain sensor 11 is placed on the skin near the blood vessel 2 and the pressure sensor 12 is placed on the skin at a position separated from the strain sensor 11. Wrap around and attach. At this time, the airbag 15 is disposed at a position separated from the strain sensor 11 and the pressure sensor 12. In this state, the strain sensor 11, the pressure sensor 12, and the airbag 15 are fastened by the mounting band 13 and are fixed to the arm 1.

  Next, the pressure control device 21 calculates the pressure in the wearing band 13 with respect to the skin surface based on the detection signal from the pressure sensor 12. The pressure control device 21 controls the air adjustment mechanism 16 so that the calculated pressure falls within a preset pressure range stored in advance, and adjusts the amount of air enclosed in the airbag 15. Thereby, the pressure in the wearing band 13, that is, the pressing pressure of the strain sensor 11 against the skin surface is maintained within the set pressure range.

  In the state where the pressing pressure of the strain sensor 11 is maintained within a certain range, the blood pressure calculating device 22 calculates the periodic fluctuation of the pressure as a continuous waveform based on the detection signal from the strain sensor 11. The blood pressure value is continuously calculated based on the calculated continuous waveform. When a display device or the like is provided, the calculated blood pressure value is displayed on the display device.

  Further, during the measurement of blood pressure, for example, even when the tightening state of the wearing band 13 changes due to the movement of the patient, the pressure control device 21 controls the inside of the airbag 15 based on the detection signal of the pressure sensor 12. Is adjusted. Therefore, the pressure in the mounting band 13 can be kept within a certain range. Therefore, it is possible to continuously perform high-precision blood pressure measurement while suppressing the fluctuation of the measurement condition due to the movement of the patient and keeping the pressure of the strain sensor 11 pressed against the skin surface within a certain range.

  Here, an output example of the strain sensor 11 is shown in FIG. In FIG. 3, the vertical axis represents strain (με), and the horizontal axis represents time (0.1 s).

  The blood pressure measurement device 10 of the present embodiment includes a strain sensor 11 capable of detecting a minute strain, and adopts a configuration that suppresses fluctuations in the pressure of pressing the strain sensor 11 against the skin surface. Therefore, a pulse wave (pressure fluctuation) in the blood vessel 2 corresponding to the contraction and expansion of the heart becomes a minute fluctuation of the skin surface near the blood vessel 2 and can be detected by the strain sensor 11.

  As shown in FIG. 3, the output signal of the strain sensor 11 basically draws a continuous waveform that alternates between a maximum value and a minimum value. This continuous waveform can be regarded as an arterial pressure waveform. In the continuous waveform, the minimum value is a distortion generated in the blood vessel 2 due to the expansion of the heart, and the maximum value is a distortion generated in the blood vessel 2 due to the contraction of the heart. Therefore, the maximum value of the arterial pressure waveform correlates with the highest pressure of the blood vessel 2 (equal to the systolic blood pressure), and the minimum value of the arterial pressure waveform correlates with the lowest pressure of the blood vessel 2 (equal to the diastolic blood pressure).

  It is preferable to calibrate the strain sensor 11 before using the blood pressure measurement device 10. For example, a general blood pressure measurement device is separately prepared, the blood pressure value of the patient is measured, and the measurement result is compared with the blood pressure value measured by the blood pressure measurement device 10 to calibrate the blood pressure measurement device 10. May go. A general blood pressure measurement device may be a device capable of measuring blood pressure continuously or discontinuously (for example, temporarily), and may measure blood pressure based on an oscillometric method or a Livarotch-Korotkov method. It may be a device that performs the operation. The calibration can also be performed when the blood pressure measurement is performed by the blood pressure measurement device 10.

  In the case of a device for measuring blood pressure while being worn on a patient's arm, the device may be worn on the same arm on which the blood pressure measurement device 10 is worn, or may be worn on the opposite arm to measure blood pressure. May be performed. The calibration may be performed manually by an operator. The calibration is performed by connecting the blood pressure measurement device serving as a measurement reference and the blood pressure measurement device 10 of the present embodiment by wire or wirelessly, and May be performed automatically according to the given algorithm. A blood pressure measurement system including the blood pressure measurement device 10 of the present embodiment and a calibration blood pressure measurement device that measures a blood pressure value as reference information for performing calibration of blood pressure measurement by the blood pressure measurement device 10 may also be used. Good. In this case, the blood pressure calculation device 22 of the blood pressure measurement device 10 automatically performs the calibration of the blood pressure value calculation based on the information detected by the strain sensor 11 based on the blood pressure value input from the calibration blood pressure measurement device. You may do so.

  For example, the calibration may be performed when the blood pressure measurement device 10 continuously measures the blood pressure and measures a blood pressure value that deviates from a preset range. By performing the calibration in this manner, the accuracy of the blood pressure value measured by the blood pressure measurement device 10 can be improved. In particular, during hemodialysis, measurement conditions may change due to movement of the patient, so it is recommended that calibration be performed periodically during continuous blood pressure measurement. For example, the calibration may be performed every 30 minutes to 1 hour.

  As described above, according to the blood pressure measurement device 10 according to the present embodiment, based on the pressure information detected by the pressure sensor 12, the air pressure is set so that the pressing pressure of the strain sensor 11 against the skin surface falls within the set range. The amount of air enclosed in the bag 15 is adjusted. Therefore, even in a case where continuous blood pressure measurement is performed over a long period of time in hemodialysis therapy or the like, a change in measurement conditions can be suppressed regardless of patient movement. Further, a more accurate blood pressure value can be continuously obtained using the strain sensor 11.

  In the above description of the embodiment, the case where the strain sensor 11 and the pressure sensor 12 are fixed to the skin surface using the wearing band 13 as the wearing device is described as an example, but the wearing device is not limited to the wearing band. . The form is not limited as long as each sensor is pressed against and fixed to the skin surface, and for example, clothing that adheres to the skin may be used as the wearing equipment.

  Although various types of pressure sensors 12 can be used, for example, the same type of pressure sensor as the strain sensor may be used. By using the same type of sensor, the pressure detected by the pressure sensor and the pressing pressure of the strain sensor against the skin surface can be more approximated.

  When the strain sensor 11 is mounted inside the mounting band 13 in advance, the strain sensor 11 may be rotatably mounted on the mounting band 13. By doing so, the strain sensor 11 can be easily arranged along the blood vessel 2.

  The connection between the strain sensor 11 and the pressure sensor 12 and the controller 20 is not limited to a wired connection, but may be a wireless connection. Alternatively, the blood pressure information measured by the blood pressure measurement device 10 may be transmitted to another device, and the blood pressure state may be monitored in the other device.

  Further, although the case where the blood pressure measurement is performed on the patient's arm is described as an example, the case where the blood pressure measurement is performed on another site may be performed. The blood pressure measurement by the blood pressure measurement device 10 is not limited to being used in hemodialysis therapy, and may be used in other therapies.

  Note that by appropriately combining any of the above-described various embodiments, the effects of the respective embodiments can be achieved.

Reference Signs List 1 arm 2 blood vessel 10 blood pressure measurement device 11 strain sensor 12 pressure sensor 13 mounting band 14 pressure adjustment unit 15 airbag 16 air adjustment mechanism 17 air tube 20 controller 21 pressure control device 22 blood pressure calculation device

Claims (10)

A strain sensor placed on the skin near the blood vessel,
A pressure sensor disposed on the skin at a location spaced from the strain sensor;
A mounting device that is mounted on the patient and arranges and fixes the strain sensor and the pressure sensor to the skin surface,
A pressure adjustment unit that is arranged inside the wearing device and adjusts the pressing pressure of the strain sensor against the skin surface,
Based on the pressure information detected by the pressure sensor, so that the pressure of the strain sensor against the skin surface is within a set range, a pressure control device that controls the pressure adjustment unit,
A blood pressure calculation device that calculates a blood pressure value based on information detected by the strain sensor,
A blood pressure measurement device comprising:   The blood pressure measurement device according to claim 1, wherein the pressure adjustment unit is disposed inside the mounting device and away from the strain sensor and the pressure sensor.   3. The blood pressure calculation device according to claim 1, wherein the blood pressure calculation device calculates a periodic change in pressure as a continuous waveform based on information detected by the strain sensor, and continuously calculates a blood pressure value based on the calculated continuous waveform. 4. Blood pressure measuring device.   The blood pressure measurement device according to claim 3, wherein the blood pressure calculation device calculates a maximum pressure from a maximum value of the continuous waveform and calculates a minimum pressure from a minimum value of the continuous waveform.   The blood pressure measurement device according to any one of claims 1 to 4, wherein the wearing device is a wearing band worn around a patient's arm. A blood pressure measurement device according to any one of claims 1 to 5,
Mounted on a patient, as a reference information for performing calibration of blood pressure measurement by the blood pressure measurement device, and a calibration blood pressure measurement device that measures the blood pressure value,
The blood pressure calculating device of the blood pressure measuring device is a blood pressure measuring system that performs calibration of calculating a blood pressure value based on information detected by a strain sensor based on a blood pressure value input from a blood pressure measuring device for calibration.   The blood pressure measurement system according to claim 6, wherein the calibration blood pressure measurement device is a device that performs blood pressure measurement based on an oscillometric method or a Livarotch-Korotkov method.   The blood pressure value as reference information from the blood pressure measurement device for calibration is periodically input to the blood pressure calculation device of the blood pressure measurement device, and calibration is performed periodically in the blood pressure calculation device. Blood pressure measurement system. A strain sensor placed on the skin in the vicinity of the blood vessel, a pressure sensor placed on the skin at a position separated from the strain sensor, and a pressure adjustment unit placed apart from the strain sensor and the pressure sensor, Attach the device to the patient to fix it,
A blood pressure measurement method that calculates a blood pressure value based on information detected by a strain sensor while maintaining a pressure of a strain sensor against a skin surface within a set range by a pressure control unit based on pressure information detected by the pressure sensor.   In the calculation of the blood pressure value, the periodic fluctuation of the pressure is calculated as a continuous waveform based on the information detected by the strain sensor, and the blood pressure value is continuously calculated based on the calculated continuous waveform. When performing accurate measurement, a blood pressure value as reference information is measured using a blood pressure measurement device for calibration, and based on the measured blood pressure value, a blood pressure value calculation based on detection information by a strain sensor is performed. The blood pressure measurement method according to claim 9, wherein calibration is performed.

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