JP2011041684A - Biological information measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cuff from being excessively tightly mounted. <P>SOLUTION: The cuff 10 is configured so as to be expanded and contracted. A cuff control part comprises the combination of a pump 24, a constant discharge valve 25, a rapid discharge valve 26, a pump driving part 28, a valve driving part 29 and a CPU 31, and controls the cuff 10. The cuff control part executes a cuff mounting assisting operation of maintaining the cuff 10 in an expanded state against pressurization applied to the cuff 10 when the mounting of the cuff 10 is started and contracting the cuff 10 according to the pressurization applied to the cuff 10 when the mounting of the cuff 10 is completed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a biological information measuring apparatus that measures biological information such as blood pressure using a cuff.

  In the biological information measuring apparatus, various measuring means such as sensors are used according to the biological information to be measured. When biological information such as blood pressure or pulse wave is a measurement target, a cuff (“ (Sometimes called “manchette” or “armband”) (see, for example, Patent Document 1). The cuff is worn by being wound around a predetermined part (for example, an upper limb, a lower limb, a finger, or a toe) of a subject (see, for example, Patent Document 2 and Patent Document 3). The “subject” means a person who receives measurement of biological information.

  The cuff has an air bag that can be inflated and inflated by air supply / exhaust control from the outside, and presses the part with the air bag when attached to a predetermined part. The biological information measuring device measures blood pressure and pulse waves by detecting a change in cuff pressure (that is, air pressure inside the air bag).

  When measuring blood pressure using an oscillometric method using a cuff, the cuff is wound around a predetermined site, the cuff pressure is increased or decreased by air supply / exhaust to the cuff, and the amplitude in the pulse wave detected at that time The cuff pressure when the increase is significant is determined as systolic blood pressure (maximum blood pressure), and the cuff pressure when the amplitude decrease is significant is determined as diastolic blood pressure (minimum blood pressure) (see, for example, Patent Document 4). In addition to this method, the cuff pressure when the amplitude exceeds a specific ratio with respect to the maximum value is determined as systolic blood pressure, and the cuff pressure when the amplitude falls below a specific ratio with respect to the maximum value is determined as the diastole. There are various known techniques such as determination as blood pressure.

JP 2009-172098 A JP-A-2005-319030 JP 2005-329162 A JP 2006-255096 A

  When measuring biological information using a cuff, it is very important to wear the cuff with an appropriate tightness in order to obtain an accurate measurement value.

  For example, when measuring blood pressure by the oscillometric method, if the cuff is worn too loosely, the pulse wave cannot be detected unless the cuff pressure is significantly increased, so the measured value tends to be higher than the actual blood pressure, If an excessively tight cuff is worn, the pulse wave can be detected without increasing the cuff pressure so much, and the measured value tends to be lower than the actual blood pressure. In particular, when blood pressure is measured at a peripheral site such as a toe, it is known that constriction may occur due to excessive wearing of the cuff and the measurement accuracy may be significantly reduced. Yes.

  In addition, when the subject himself wears the cuff himself or when a person other than the subject wears the cuff on the subject, the wearer often tries to wear the cuff on the “tight”. . This is because accurate measurement values are desired.

  However, it is not easy for the wearer or the subject to accurately determine how much “tightness” the cuff is attached to make it appropriate.

  An object of the present invention is to provide a biological information measuring device capable of preventing a cuff from being worn too tightly.

  The biological information measuring apparatus of the present invention includes a cuff configured to be inflatable and deflate, and a cuff control unit that controls the cuff, and the cuff control unit is configured so that when the cuff attachment starts, A cuff attachment assisting operation is performed in which the cuff is maintained in an inflated state against the pressure applied to the cuff, and the cuff is contracted in accordance with the pressure applied to the cuff when the cuff is completely attached.

  According to the present invention, it is possible to prevent the cuff from being worn tightly.

The block diagram which shows the structure of the blood pressure meter which concerns on one embodiment of this invention 1 is an external view of a cuff according to an embodiment of the present invention. The figure which shows the state before mounting | wearing of the cuff which concerns on one embodiment of this invention. The figure which shows the state at the time of mounting | wearing of the cuff concerning one embodiment of this invention The flowchart for demonstrating the cuff mounting | wearing assistance operation | movement which concerns on one embodiment of this invention. Flow chart for explaining blood pressure measurement execution control operation according to an embodiment of the present invention The flowchart for demonstrating the cuff removal determination operation | movement which concerns on one embodiment of this invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, the case where the biological information measuring device of the present invention is applied to a sphygmomanometer will be described as an example, but the present invention can be applied to other types of biological information measuring devices as long as they use a cuff. .

  FIG. 1 is a block diagram showing a configuration of a sphygmomanometer as a biological information measuring apparatus according to an embodiment of the present invention.

  1 includes a cuff 10, a hose 21, a tube 22, a pressure sensor 23, a pump 24, a constant discharge valve 25, a rapid discharge valve 26, a signal processing unit 27, a pump drive unit 28, a valve drive unit 29, and a display unit. 30, an arithmetic processing unit (CPU: Central Processing Unit) 31, an operation unit 32, and a storage unit 33.

  The pipe 22, the pressure sensor 23, the pump 24, the constant discharge valve 25, the rapid discharge valve 26, the signal processing unit 27, the pump drive unit 28, the valve drive unit 29, the display unit 30, the CPU 31, the operation unit 32, and the storage unit 33 are It is housed in a blood pressure monitor main body (not shown).

  The tube 22 is provided as an air passage inside the blood pressure monitor main body. The hose 21 has flexibility, and is provided as an air passage that connects the sphygmomanometer body and the cuff 10.

  The cuff 10 is a belt-like body configured to be wound around a predetermined part of the subject. A specific configuration of the cuff 10 will be described later.

  The pressure sensor 23 is a pressure-electrical converter using a semiconductor pressure sensor, for example, and is provided in the tube 22. The pressure sensor 23 measures the cuff pressure by converting the cuff pressure of the cuff 10 into an electrical signal and outputting it as a cuff pressure signal to the signal processing unit 27. Since the pressure sensor 23 continuously measures cuff pressure, a series of generated cuff pressure signals represents a change in cuff pressure over time.

  The signal processing unit 27 includes an amplifier, a low-pass filter, and an analog / digital (A / D) converter, amplifies the cuff pressure signal input from the pressure sensor 23, and removes high-band noise from the amplified signal. Filtering is performed, A / D conversion of the filtered signal is performed, and the signal after A / D conversion is output to the CPU 31 as cuff pressure data.

  The pump 24 pressurizes the cuff pressure by supplying air to the cuff 10 through the pipe 22 and the hose 21. The pump drive unit 28 has a control circuit that drives the pump 24 by outputting a drive signal of the pump 24 to the pump 24 in accordance with an instruction signal from the CPU 31, and starts and stops the supply of air from the pump 24 to the cuff 10. .

  The constant exhaust valve 25 and the quick exhaust valve 26 are provided in the pipe 22 and function as exhaust valves that control exhaust from the cuff 10. The constant discharge valve 25 and the quick discharge valve 26 are, for example, electromagnetic valves, and the opening amounts of the respective valves can be adjusted. The constant exhaust valve 25 and the quick exhaust valve 26 prevent exhaust from the cuff 10 when closed, and allow exhaust from the cuff 10 when open. The constant exhaust valve 25 has a smaller exhaust amount per unit time when the opening amount is maximum than the rapid exhaust valve 26. Accordingly, the cuff pressure is normally reduced by opening only the constant discharge valve 25, and when high-speed pressure reduction is necessary, the rapid discharge valve 26 is opened in addition to the constant discharge valve 25.

  The valve drive unit 29 has a control circuit that drives the constant exhaust valve 25 and the rapid exhaust valve 26 by outputting drive signals for the constant exhaust valve 25 and the rapid exhaust valve 26 according to the instruction signal from the CPU 31. And the opening amount of the rapid exhaust valve 26 is controlled.

  The CPU 31 controls various operations such as blood pressure measurement executed in the sphygmomanometer according to the present embodiment by executing a software program stored in the storage unit 33. Various operations executed in the sphygmomanometer will be described later.

  The combination of the pump 24, the pump drive unit 28, the constant exhaust valve 25, the rapid exhaust valve 26, the valve drive unit 29, and the CPU 31 constitutes a cuff control unit that controls the cuff pressure by performing supply / exhaust control on the cuff 10. . The combination of the pressure sensor 23, the signal processing unit 27, and the CPU 31 constitutes a cuff pressure measurement unit that measures cuff pressure.

  The operation unit 32 is an input device such as a push button or a touch panel, for example, and generates an operation signal according to a user input operation and outputs the operation signal to the CPU 31.

  The storage unit 33 is, for example, a semiconductor storage device, and stores software programs executed by the CPU 31, cuff pressure data acquired from the signal processing unit 27, and the like.

  The display unit 30 is a liquid crystal display device, for example, and displays various information on the screen in accordance with an instruction signal from the CPU 31.

  The above is the configuration of the sphygmomanometer of the present embodiment, but the above configuration can be implemented with various modifications.

  For example, the sphygmomanometer may further include a printing unit such as a printer that prints various information on a sheet or the like in accordance with an instruction signal from the CPU 31. Moreover, the sphygmomanometer may further include a communication unit for communicably connecting to other devices in order to exchange various information. The sphygmomanometer may further include an audio output unit for outputting a synchronization sound when measuring blood pressure or outputting an alarm sound when abnormality is detected.

  For example, although two exhaust valves are used in the above configuration, the number of exhaust valves may be one or three or more. Further, in the above configuration, the constant exhaust valve 25 is used as the main exhaust means and the quick exhaust valve 26 is used as the auxiliary exhaust means. However, for example, when the air capacity of the cuff 10 is large, the auxiliary exhaust means As an alternative, instead of using the quick exhaust valve 26, another means such as reverse rotation of the pump 24 may be used.

  Next, the configuration of the cuff 10 will be described. The cuff 10 has a configuration suitable for winding around a toe (particularly a mother toe), and specifically includes an air bag 11 and hook-and-loop fasteners 12 and 13 as shown in FIG.

  Even if the air bag 11 is curved in a C shape and is in a non-pressurized state (in other words, without positive air supply from the pump 24), the air bag 11 naturally swells by containing air therein. This is a deformable resin bag formed in advance so as to maintain the shape. Since it is formed in a curved shape, the cuff 10 can be easily wound around the toes. In addition, since a naturally inflated shape is maintained even in a non-pressurized state, air can be accommodated in the interior without maintaining the pump 24 and a constant cuff pressure can be maintained. It can be simplified.

  In order to keep the air bag 11 naturally inflated, a sponge or the like may be inserted into the air bag 11 in advance, but the configuration of the cuff 10 is further simplified, and the air bag 11 It is desirable that the inside of the air bag 11 is hollow so as not to reduce the contractility of the air bag 11.

  An opening (not shown) is formed on the outer peripheral surface of the air bag 11, and a hose 21 is inserted therein. When air is introduced into the air bladder 11 via the hose 21, the air bladder 11 expands while maintaining its curved shape, and the cuff pressure increases. When air is discharged from the air bag 11 via the hose 21, the air bag 11 contracts while maintaining the curved shape, and the cuff pressure decreases.

  The hook-and-loop fastener 12 is a belt-like body provided so as to cover the outer peripheral surface of the air bag 11, and an opening (not shown) is formed at the center thereof, through which the hose 21 passes. The hook-and-loop fastener 13 is a belt-like body provided so as to extend from one end of the hook-and-loop fastener 12, can be bonded to the hook-and-loop fastener 13, and can be peeled off from the hook-and-loop fastener 13.

  As a method for winding and mounting the cuff 10 having the above configuration, for example, the cuff 10 is first extended by hand (see FIG. 3), and after placing the toes on the inner peripheral surface side, the cuff 10 is formed in a C shape. The footpad is surrounded by the cuff 10 and the cuff 10 is fixed to the footpad by bonding the surface fasteners 12 and 13 in a state where the footpad is compressed to a certain degree by the cuff 10 (see FIG. 4).

  The above is the configuration of the cuff 10, but the above configuration can be implemented with various changes depending on the blood pressure measurement target site and the like.

  Next, the cuff wearing assist operation that is executed in the blood pressure monitor of the present embodiment will be described. The cuff attachment assisting operation automatically controls the cuff pressure so that the subject himself or another person intends to attach the cuff 10 to the subject so that the subject is not too tightly attached. The operation to execute.

  FIG. 5 is a flowchart for explaining an example of the cuff attachment assisting operation.

  In the initial state when the cuff attachment assist operation starts, the pump 24 is not driven, and the constant exhaust valve 25 and the quick exhaust valve 26 are opened. Although the cuff 10 is in a non-pressurized state, as described above, the cuff 10 has a constant cuff pressure because the cuff 10 has a shape that maintains a naturally swollen state under the non-pressurized state, and therefore, When pressure is applied from the outside or the capacity changes due to deformation, the cuff pressure increases or decreases.

  When the cuff wearing assist operation is started, cuff pressure measurement is started (step S101). The cuff pressure is measured by the pressure sensor 23 generating a cuff pressure signal based on the cuff pressure, and the signal processing unit 27 generating cuff pressure data from the cuff pressure signal and outputting it to the CPU 31.

  When the cuff pressure measurement is started, the CPU 31 determines whether or not the cuff pressure has increased from a series of cuff pressure data sequentially input from the signal processing unit 27 (step S102). For example, when the increase width from the first measurement value is 0.25 mmHg or more, the CPU 31 determines that the cuff pressure has increased. Thus, since the increase in the cuff pressure from the initial state can be detected, it is possible to detect that the cuff 10 has started to be attached to the subject.

  When the cuff pressure increases, the CPU 31 can recognize that the cuff 10 has been attached to the subject. In this case, the CPU 31 outputs an instruction signal for closing both the constant exhaust valve 25 and the rapid exhaust valve 26 to the valve drive unit 29. According to the instruction signal, the valve drive unit 29 sets the opening amounts of both the constant exhaust valve 25 and the rapid exhaust valve 26 to zero, and closes the constant exhaust valve 25 and the rapid exhaust valve 26 (step S103).

  As described above, when the cuff 10 is attached to the subject, the constant exhaust valve 25 and the rapid exhaust valve 26 are closed, and the exhaust from the cuff 10 is prevented. Thereby, even if the cuff 10 is pressed against the predetermined part of the subject and a pressure is applied from the predetermined part, the cuff 10 does not contract and maintains the expanded state against the pressure. Can do.

  Further, since the cuff 10 is formed so as to maintain a naturally inflated state even in a non-pressurized state, when the cuff 10 is attached, the cuff 10 is in an expanded state without supplying air from the pump 24. Can be formed. When a small-diameter cuff is used, such as the toe cuff 10 or the finger or child cuff as in the present embodiment, the cuff 10 is not required to be actively supplied from the pump 24. The expanded state can be easily formed.

  The “expanded state” of the cuff 10 is different from the “naturally expanded state” of the cuff 10 described above. That is, the latter is a state in which the air bag 11 of the cuff 10 is inflated with a low tension and can be easily contracted and crushed when a force is applied from the outside, whereas the air bag 11 of the cuff 10 has a high tension. It is in a state where it swells and does not easily contract even if force is applied from the outside.

  After closing the constant exhaust valve 25 and the quick exhaust valve 26 in step S103, the CPU 31 determines whether or not the cuff pressure has further increased from a series of cuff pressure data sequentially input from the signal processing unit 27. (Step S104).

  If there is a further increase in the cuff pressure (step S104: YES), the CPU 31 can determine that it was correct to recognize that the cuff 10 was attached in step S103. In this case, the cuff attachment assisting operation proceeds to step S106.

  When there is no further increase in the cuff pressure (step S104: NO), the CPU 31 can determine that it is erroneous to recognize that the cuff 10 has been attached in step S103. In this case, the CPU 31 outputs an instruction signal to the valve drive unit 29 in order to open the constant exhaust valve 25 and the rapid exhaust valve 26 as in the initial state (step S105), and the cuff attachment assist operation returns to step S101. . Thereby, when the start of wearing the cuff 10 is erroneously recognized, the cuff wearing assist operation can be executed again from the beginning.

  In step S <b> 106, the CPU 31 outputs an instruction signal for slightly opening only the constant exhaust valve 25 to the valve drive unit 29. In accordance with the instruction signal, the valve drive unit 29 opens the constant exhaust valve 25 slightly with the opening amount of the constant exhaust valve 25 set to a predetermined value while maintaining the opening amount of the rapid exhaust valve 26 at zero.

  Then, the CPU 31 performs the exhaust from the cuff 10 while controlling the changing speed of the cuff pressure by adjusting the opening amount of the constant exhaust valve 25 until the predetermined amount of exhaust is performed from the cuff 10 (steps S107 and S108). ). Here, the CPU 31 feedback-controls the opening amount of the constant exhaust valve 25 according to the change rate of the cuff pressure so that the change rate of the cuff pressure is kept within a certain range.

  As the determination threshold value in step S108, a predetermined fixed value may be employed, a value calculated based on the detected increase in the cuff pressure may be employed, An appropriate value of can also be adopted.

  When a predetermined amount of exhaust is performed from the cuff 10, the CPU 31 outputs an instruction signal to the valve drive unit 29 in order to close the constant exhaust valve 25 again (step S109).

  By the operations in steps S106 to S109, the air inside the cuff 10 can be released to some extent while maintaining the expanded state of the cuff 10. For this reason, when the cuff 10 is completely attached and the cuff 10 is released from the inflated state, it is avoided that the cuff 10 is in an insufficiently attached state, and the cuff is attached with an appropriate tightness. be able to. Furthermore, since the change speed of the cuff pressure is controlled, this can be realized more reliably.

  In step S <b> 110, the CPU 31 determines whether or not the cuff pressure has been stabilized based on a series of cuff pressure data sequentially input from the signal processing unit 27. For example, the CPU 31 determines that the cuff pressure has stabilized when no substantial fluctuation of the cuff pressure has occurred over a certain period (for example, 4 seconds). Thereby, it can be detected that the cuff 10 has been attached.

  When no significant cuff pressure fluctuation occurs within a certain period and the cuff pressure is stabilized (step S110: YES), the CPU 31 can recognize that the cuff 10 has been successfully attached. In this case, the cuff attachment assisting operation proceeds to step S111.

  Here, it is desirable to appropriately set the determination threshold so that the cuff pressure fluctuation caused by the pulse is not determined as a significant cuff pressure fluctuation. Thereby, the cuff attachment completion determination can be performed more accurately.

  When a significant cuff pressure fluctuation occurs within a certain period and the cuff pressure is not stabilized (step S110: NO), the CPU 31 can recognize that the cuff 10 has not been successfully attached. In this case, the CPU 31 outputs an instruction signal to the valve drive unit 29 in order to open the constant exhaust valve 25 and the rapid exhaust valve 26 as in the initial state (step S105), and the cuff attachment assist operation returns to step S101. . As described above, when the cuff 10 is not completely attached, that is, when the cuff 10 needs to be attached again, the cuff attachment assisting operation can be executed again from the beginning.

  In step S <b> 111, the CPU 31 outputs an instruction signal for opening both the constant exhaust valve 25 and the rapid exhaust valve 26 to the valve drive unit 29. Thereby, the constant exhaust valve 25 and the rapid exhaust valve 26 are opened. Since the cuff 10 receives a pressure from a predetermined part of the subject, the cuff 10 can be exhausted only by opening the constant exhaust valve 25 and the rapid exhaust valve 26. As a result, the cuff 10 does not maintain the expanded state, contracts according to the pressure from the predetermined part, and does not adhere to the predetermined part of the subject.

  Therefore, the cuff wearing assist operation is terminated after realizing the wearing state of the cuff 10 with an appropriate tightness.

  FIG. 6 is a flowchart for explaining an example of the blood pressure measurement execution control operation executed in the blood pressure monitor of the present embodiment.

  The sphygmomanometer according to the present embodiment performs the blood pressure measurement in step S202 after performing the above-described cuff attachment assisting operation in step S201. As the blood pressure measurement operation, any known technique such as that described in Patent Document 4 can be employed.

  Then, after executing the blood pressure measurement, the CPU 31 executes the cuff removal determination (step S203). As a result of the cuff removal determination, when it is determined that the cuff 10 is removed (step S204: YES), the blood pressure measurement execution control operation returns to step S201, and it is determined that the cuff 10 is not removed. (Step S204: NO), the CPU 31 executes the cuff removal determination again.

  That is, when the cuff attachment assisting operation is executed once and the blood pressure measurement is executed thereafter, the CPU 31 does not execute the next cuff attachment assisting operation unless the cuff 10 is removed. Thereby, it is possible to avoid repeatedly performing the cuff attachment assisting operation on the same subject.

  FIG. 7 is a flowchart for explaining an example of the cuff removal determination operation executed in the sphygmomanometer of the present embodiment.

  In step S301, based on a series of cuff pressure data sequentially input from the signal processing unit 27, the CPU 31 determines whether or not the cuff pressure has significantly decreased and then slightly increased. “The cuff pressure decreases significantly and then increases slightly” is a fluctuation behavior of the cuff pressure that normally occurs when a general cuff is removed, so by adopting this as a criterion, The removal of the cuff 10 can be detected with a certain level of accuracy. When the cuff pressure fluctuation behavior is not detected within the predetermined period (step S301: NO), the CPU 31 determines that the cuff 10 is not removed (step S304).

  In order to accurately detect the fluctuation behavior, it is desirable to appropriately set an appropriate determination threshold based on various factors such as the size of the cuff 10.

  When this cuff pressure fluctuation behavior is detected within a predetermined period (step S301: YES), the CPU 31 stabilizes the cuff pressure based on a series of cuff pressure data sequentially input from the signal processing unit 27. Whether or not (step S302). For example, the CPU 31 determines that the cuff pressure has stabilized when no substantial fluctuation of the cuff pressure has occurred over a certain period (for example, 4 seconds). Thereby, it can be detected that the cuff 10 has been removed.

  When no significant cuff pressure fluctuation occurs within a certain period and the cuff pressure is stabilized (step S302: YES), the CPU 31 determines that the cuff 10 has been removed (step S303).

  Here, it is desirable to appropriately set the determination threshold so that the cuff pressure fluctuation caused by the pulse is also determined as a significant cuff pressure fluctuation. Thereby, the cuff removal determination can be performed more accurately.

  When a significant cuff pressure fluctuation occurs within a certain period and the cuff pressure is not stabilized (step S302: NO), the CPU 31 determines that the cuff 10 has not been removed yet (step S304).

  The sphygmomanometer of the present embodiment can execute the cuff removal determination in this way and proceed to the next cuff attachment assisting operation.

  As described above, according to the present embodiment, when mounting of the cuff 10 is started, the cuff 10 is maintained in an expanded state against the pressure applied to the cuff 10, and the mounting of the cuff 10 is completed. Sometimes, a cuff attachment assisting operation is performed in which the cuff 10 is contracted in accordance with the pressure applied to the cuff 10. Thereby, even if the wearer of the cuff 10 does not judge by himself, it is possible to reliably prevent the cuff 10 from being worn excessively, and thus improve the measurement accuracy of biological information such as blood pressure. it can.

  The embodiment of the present invention has been described above. The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the configuration and operation of the apparatus described in the above embodiment are examples, and it is obvious that these can be partially changed, added, and deleted within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Cuff 11 Air bag 12, 13 Surface fastener 21 Hose 22 Pipe 23 Pressure sensor 24 Pump 25 Constant exhaust valve 26 Rapid exhaust valve 27 Signal processing part 28 Pump drive part 29 Valve drive part 30 Display part 31 CPU
32 Operation unit 33 Storage unit

Claims (8)

A cuff configured to be inflatable, and a cuff controller that controls the cuff,
The cuff control unit maintains the cuff in an inflated state against the pressure applied to the cuff when the cuff attachment starts, and is applied to the cuff when the cuff attachment is completed. Performing a cuff wearing assist operation to contract the cuff in accordance with the pressing,
Biological information measuring device. The cuff control unit has an exhaust valve that controls exhaust from the cuff, and closes the exhaust valve when the cuff attachment starts, and when the cuff attachment is completed, the exhaust valve Release
The biological information measuring device according to claim 1. The cuff control unit further includes a pump for supplying air to the cuff,
The cuff is formed so as to maintain a state in which air is accommodated without being supplied from the pump,
The cuff control unit closes the exhaust valve without driving the pump when the cuff is attached.
The biological information measuring device according to claim 2. The cuff control unit closes the exhaust valve without driving the pump when a cuff pressure rises while the exhaust valve is opened without driving the pump.
The biological information measuring device according to claim 3. The cuff controller performs a predetermined amount of exhaust from the cuff by opening the exhaust valve after closing the exhaust valve and increasing the cuff pressure when mounting of the cuff is started. The exhaust valve is closed again,
The biological information measuring device according to claim 2. The cuff controller performs a predetermined amount of exhaust from the cuff while controlling the changing speed of the cuff pressure.
The biological information measuring device according to claim 5. The cuff controller closes the exhaust valve and raises the cuff pressure, and then opens the exhaust valve after the cuff pressure is stabilized.
The biological information measuring device according to claim 2. The cuff controller determines whether or not the cuff has been removed, and after executing the cuff attachment assisting operation once, does not execute the next cuff attachment assisting operation until it is determined that the cuff has been removed.
The biological information measuring device according to claim 1.

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