JP2009022477A - Sphygmomanometry apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sphygmomanometry apparatus for measuring blood pressure with a good S/N ratio of systolic blood pressure measurement while reducing phenomena that pulse waves on the upstream side of a cuff are detected by a pulse wave detection part via an ischemia air bag. <P>SOLUTION: The sphygmomanometry apparatus is provided with: a first pipe connected between the ischemia air bag and a pressure elevating and reducing means via a first open/close valve 15-2; a second pipe connected between a sub-air bag and the pressure elevating and reducing means via a second open/close valve 15-1; and a third pipe connected between an air bag for detecting pulse waves and a cuff pressure detecting means via a third open/close valve. A bypass flow path comprising a first fluid body resistor 14 is provided between the first pipe connected to the ischemic air bag for and the third pipe connected to the air bag for pulse wave detection. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blood pressure measurement device, and more particularly to a technique for measuring blood pressure using a cuff for ischemia.

  According to the oscillometric blood pressure measurement method, the cuff pressure is raised to a pressure higher than the systolic blood pressure, the blood vessel at the measurement site is once closed, and the artery at the measurement site is gradually reduced while the cuff pressure is gradually reduced. The blood pressure is measured by detecting the change in the amplitude of the pulse wave superimposed on the cuff pressure signal generated based on the volume change. The cuff used for blood pressure measurement has the strongest cuff that can press the blood vessel in the center, and the cuff that presses this blood vessel toward both ends of the cuff gradually decreases and has a cuff edge effect that becomes almost zero at both ends of the cuff. Yes.

  Due to this characteristic, when the cuff pressure is sufficiently higher than the systolic blood pressure, the change in the amplitude of the pulse wave during blood pressure measurement is synchronized with the heart beat from the heart side of the measurement site, and the blood flow is upstream of the cuff ( It becomes almost constant due to the phenomenon that reaches the end of the heart and is returned.

  Further, when the cuff pressure is reduced, the blood flow from the heart side of the measurement site gradually enters the cuff central portion and invades while increasing the degree of invasion, and is pushed back. When the cuff is further depressurized, the blood vessel is closed in the center of the cuff, but the blood intrusion reaches the vicinity of the center of the cuff. Along with this, the pulse wave amplitude superimposed on the cuff pressure also changes gradually.

  In addition to this phenomenon, if the cuff pressure further decreases and the cuff pressure becomes lower than the systolic blood pressure, blood flow will occur on the distal side of the cuff (or the forearm when the measurement site is the upper arm). Become. The amplitude of the pulse wave superimposed on the cuff pressure increases as the volume changes to the distal side.

  As the cuff is further depressurized, the pulse wave amplitude increases due to an increase in the output to the peripheral side. Furthermore, as the pressure decreases further, the forearm vein located more distal than the cuff is closed by the cuff with the increase in the output to the periphery, so that the intravascular pressure of the vein and the whole artery rises, and in one cardiac cycle Timing occurs when the intravascular pressure on the distal side becomes larger than the cuff pressure.

  Due to the increase in the intravascular pressure, a baroreflex is generated from the peripheral site side, and the pulse wave amplitude is further increased by this reflection. As the cuff is further depressurized, the volume of the blood vessel during the systole increases, but due to the cuff edge characteristics, the cuff edge compression force is weakened, so the volume of the blood vessel that is capped during the diastole is increased. By decreasing, the pulse wave amplitude reaches a peak and gradually decreases. If the cuff pressure further decreases and the cuff pressure becomes lower than the diastolic blood pressure, the blood vessel is not closed during one cardiac cycle, and the pulse wave amplitude is further reduced. As the cuff pressure further decreases, the compliance of the entire cuff increases, and a series of pulse wave amplitude changes in which the pulse wave amplitude further decreases due to a decrease in the volume-pressure cuff conversion efficiency of the cuff.

  The oscillometric method measures and predicts systolic blood pressure and diastolic blood pressure from this series of pulse wave amplitude changes.

  In the measurement of systolic blood pressure, it is important to detect the cuffing phenomenon toward the peripheral side of the cuff, but when the cuff pressure is higher than the systolic blood pressure, the inflow and return of blood flow below the cuff upstream. Occurrence of pulse waves due to. In addition, this pulse wave shows a gradually increasing change, and the amount of stroke to the downstream side is initially small, and the volume change due to stroke is small compared to the blood vessel volume change on the upstream side of the cuff. It is difficult to detect the phenomenon.

  The volume change of the subcuff blood vessel at the timing when the cuffing toward the peripheral side of the cuff is a state in which about half of the volume of the blood vessel under the cuff is open or closed. Therefore, since the timing at which substantially the entire blood vessel volume under the cuff is opened or closed, that is, approximately 50% of the timing at which the pulse wave amplitude becomes the largest, the pulse wave amplitude that appears after the decompression is started. And the cuff pressure at that time are recorded in pairs, the record goes back from the point when the pulse wave amplitude becomes maximum, and the cuff pressure when the pulse wave amplitude becomes 50% of the maximum pulse wave amplitude, the systolic blood pressure The method of determining the value is adopted.

  However, the maximum pulse wave amplitude is affected by the vascular elasticity of the measurement site and the baroreflex from the cuff peripheral site. This baroreflex is caused by an increase in blood pressure in the forearm, which is the cuff peripheral region, and this increase in pressure is affected by the amount of blood flowing into the cuff peripheral region, the blood volume of the forearm, and vascular elasticity. This forearm blood is filled without being returned to the heart is called congestion. In addition to the characteristics of blood vessels, this congestion is likely to occur when the amount of blood flowing to the periphery during measurement is large, for example, when the cuff decompression rate during measurement is slow or when the pulse rate is high, and blood pressure measurement is repeated. Occasionally, this congestion is likely to occur unless the measurement interval is longer than the time required for the forearm blood flow to return to the heart. For this reason, since the maximum amplitude of the pulse wave is affected by the vascular elasticity of the individual measurement site of the individual to be measured, the likelihood of congestion, and the measurement interval, 50% of the maximum pulse wave amplitude is uniformly the systolic pressure. There is a problem of not becoming.

On the other hand, since the cuff pressure which is the target of the systolic blood pressure measurement is slightly lower than the systolic blood pressure, a small change accompanying the ejection to the cuff erasing is detected with a high S / N ratio. In addition to the cuff, a small cuff for pulse wave detection for selectively detecting the change in the volume of the blood vessel on the peripheral side is provided in the middle and the peripheral side of the cuff for ischemia, and the cuff for pulse wave detection via the cuff for cough In order to block the pulse wave signal upstream of the cuff that interferes with peripheral pulse wave detection, a cushioning material is provided between the cuff for ischemia and the cuff for pulse wave detection. There has been proposed a double cuff method in which an acoustic filter (for example, composed of a fluid resistance and a volume buffer tank) for attenuating the pulse wave of the ischemic cuff is provided in a connecting pipe with the pulse wave detection cuff (Patent Document 1).
JP 2005-185295 A

  Even in the above-described double cuff method, when the cuff pressure is larger than the systolic blood pressure, a change in blood vessel volume due to blood flow exists. Due to this presence, in order to prevent the upstream side pulse wave from entering the pressure detection unit as described above, the acoustic filter attenuates the upstream side pulse wave, and the pulse between the blood pressure prevention air bag and the pulse wave detection air bag. The propagation of wave vibration is blocked using a buffer material. However, in the acoustic filter, due to the problem of the pressure difference between the air bag for ischemia and the air bag for pulse wave detection due to the cuff decompression, the size of the volume buffer tank is limited by the limitation of the fluid resistance and the downsizing of the blood pressure measuring device. In the buffer material, the arterial wave characteristics are limited due to the problem of reduced ischemic function, so the influence of the upstream pulse wave cannot be completely eliminated, which hinders measurement of systolic blood pressure. May occur.

  In order to solve the above-described problems, according to the blood pressure measurement device of the present invention, a cuff member that is detachably attached to a blood pressure measurement site, and an air bag for ischemia that is contained in the cuff member and compresses the blood pressure measurement site. (A cuff for ischemia) and a sub-air (sub-cuff) bag that is laid on the opposite side of the blood bag for measuring blood pressure of the blood bag for ischemia and assists the compression of the air bag for blood pressure of the blood pressure measuring site A pulse wave detection air bag (pulse wave detection cuff) that lays on the blood pressure measurement site of the ischemic air bag and contacts the blood pressure downstream side of the blood pressure measurement site and detects a pulse wave generated on the downstream side. ), A pressure-increasing / decreasing means connected via a pipe and an open / close valve to increase / decrease the cuff body, the pressure detection pressure of the air bag for detecting the pulse wave and the air bag for preventing blood pressure Cuff pressure detection to obtain cuff pressure signal from change And a pipe between the sub-air bag and the pressure increasing / decreasing means. The pipe is connected between the air bag for ischemia and the pressure increasing / decreasing means via a first opening / closing valve. A second pipe connected via an open / close valve; a third pipe connecting the pulse wave detection air bag and the cuff pressure detecting means via a third open / close valve; Between the first pipe connected to the first pipe and the third pipe connected to the pulse wave detection air bag, there is a bypass flow path composed of a first fluid resistance, and the pulse superimposed on the cuff pressure signal. A pulse wave detection means for detecting a wave to obtain a pulse wave signal, a blood pressure determination means for determining a blood pressure value based on the cuff pressure signal and the pulse wave signal, and a display means for displaying the blood pressure value, Before pressurizing the air bag for ischemia and the air bag for pulse wave detection, the first opening / closing bar And the third open / close valve are closed, the second open / close valve is opened and the sub air bag is pressurized to a specified pressure, then the second open / close valve is closed, and the air amount of the sub air bag is The second on-off valve is closed while adjusting the pressure and measuring the blood pressure.

  The second open / close valve is opened at the end of blood pressure measurement or before the start of blood pressure measurement to exhaust the air in the sub air bag to the outside.

  Further, the first on-off valve, the second on-off valve, and the third on-off valve are electromagnetic valves.

  Further, an air tank is connected to the third pipe.

  A cuff member that is detachably attached to the blood pressure measurement site; an air bag for ischemia that is included in the cuff member and compresses the blood pressure measurement site; and a blood pressure measurement site of the air bag for ischemia A sub-air bag (sub-cuff) that is laid on the opposite side to the side in contact with the heart side of the blood pressure measurement site and assists the compression of the air bag for ischemia, and a pipe and an open / close valve for pressurizing and depressurizing the cuff member The pressure-increasing / decreasing means connected, the cuff pressure detecting means for obtaining a cuff pressure signal from the change in pressure of the air bag for ischemia, and the pipe are connected between the air bag for ischemia and the pressure-increasing means. A first pipe connected via an on-off valve; a second pipe connected via a second on-off valve between the sub air bag and the pressure-increasing / decreasing means; a pulse wave detecting air bag; and the cuff pressure. Connected to the detection means via the third on-off valve. Three pipes, a pulse wave detection means for obtaining a pulse wave signal by detecting a pulse wave superimposed on the cuff pressure signal, a blood pressure determination means for determining a blood pressure value based on the cuff pressure signal and the pulse wave signal, A blood pressure measuring device including a display means for displaying the blood pressure value, wherein the first on-off valve and the second on-off valve are closed before pressurizing the air bag for ischemia, and the third on-off valve While opening the valve and pressurizing until the sub air bag reaches a specified pressure, closing the second closing valve, adjusting the amount of air in the sub air bag, and measuring the blood pressure, The second opening / closing valve is closed.

  According to the present invention, when the cuff pressure cuff is higher than the systolic blood pressure, which was also present in the double cuff method, the cuff upstream portion (on the heart side of the central portion in the arterial running direction of the measurement portion of the ischemic bladder). Pulse waves generated by blood flow entering and exiting in synchrony with the contraction and expansion of the heart are used for ischemia by reinforcing the upstream end of the air bag for ischemia with a sub-air bag and pressing from the outside of the air bag for ischemia Since the blood vessel can be compressed to the vicinity of the edge of the air bag with the same pressure as the central portion of the air bag, the upstream cuff edge effect is reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited to the embodiments.

  FIG. 1 is a block diagram showing a blood pressure measurement device according to one embodiment of the present invention and a diagram showing air piping. In this figure, the cuff body 1 includes a cloth cuff member 2 that is detachably provided to a blood pressure measurement site including the upper arm, forearm, thigh, and lower limbs. A male (hook type) surface fastener 3 shown by a broken line is provided at the end portion on the contact side, and a female (loop type) surface fastener 4 is provided on the opposite side of the end portion from the side in contact with the measurement site. As shown in the figure, the cuff member 2 is wound around the measurement site so that the hook-and-loop fasteners are locked, so that the cuff body 1 can be mounted and removed by releasing the locking state. It is configured.

  The size of the fastener is such that the hook-and-loop fastener 4 is slightly longer than the air bag 8 for ischemia (the blood-cuff cuff) 8 and the hook-and-loop fastener 4 is wound around the arm having the maximum arm circumference length that can be measured. The length is set to sufficiently cover the surface fastener 4. Here, the hook-and-loop fastener is merely an example, and other members may be used, or a method of forming a cylinder and inserting an arm may be used.

  Inside the cuff member 2, a hemostatic air bag 8 shown by a broken line for squeezing the entire blood pressure measurement site is laid (included). The blood-insufficiency air bag 8 is connected to a pump 23 and an electromagnetic orifice diameter control valve 22 which are pressure-increasing / decreasing means via a first pipe 12 made of a soft tube via a first on-off valve 15-2. External air is introduced through the opening 23a of the pump 23 to pressurize it, and the opening of the orifice diameter of the electromagnetic orifice diameter control valve 22 is controlled to exhaust air from the opening 22 at a constant pressure reduction rate. It can be decompressed.

  In addition, on the side of the blood bladder 8 that contacts the blood pressure measurement site, the cuff downstream side of the arterial blood vessel of the blood pressure measurement site is pressed to detect a pulse wave (pulse wave detection cuff). ) 5 is laid with a backing member 6 interposed. A third pipe 11 made of a soft tube is connected to the pulse wave detection air bag 5 via a third opening / closing valve 15-1. A fluid resistance 14 made of a thin tube is connected between the first pipe 12a and the third pipe 11a. In addition, a sub-air bag (sub-cuff) 7 shown in a broken line is formed on the upstream side (heart side) of the ischemic air bag 8 to narrow the width in order to reduce the cuff edge effect on the heart side of the blood pressure measurement site. A backing member 9 is sandwiched between the air bag 8 and the sub air bag 7 and is laid on the side opposite to the side in contact with the measurement site. A second pipe 13 made of a soft tube is connected to the sub air bag 7, and the first pipe 12a and the pressure increasing / decreasing means are connected via a second opening / closing valve 16 and a second pipe 13a for opening and closing the pipe path. They are connected as shown.

The first pipes 12, 12 a, the second pipes 13, 13 a, and the third pipes 11, 11 a are provided by the connector 10 so as to be detachable from the main body 30. In the drawing, the connector 10 is configured to be detachable, but an integrated pipe may be used. The fluid resistance 14 has a function of restricting the entry and exit of air into and from the pulse wave detection air bladder 5. Further, in order to obtain the cuff pressure value signal of the air bag 8 for ischemia and the pulse wave signal of the air bag 5 for detecting the pulse wave, the air bag 8 for ischemia has the first pipes 12 and 12a, the fluid resistance 14, The three-pipe 11a is connected to a pressure sensor 31 that is a cuff pressure detection means, while the pulse wave detection air bag 5 is connected to the pressure sensor 31 that is a cuff pressure detection means via a third pipe 11 and 11a. Has been.
A pressure measuring unit 32 that amplifies the signal converted into an electric signal by the pressure sensor 31 and limits the frequency band is connected. Furthermore, an A / D converter 33 that converts an analog electric signal into a digital signal is connected, and the digital signal is output to the central control unit 35.

  The central control unit 35 includes a RAM 36 capable of writing and reading data, and includes a pulse wave processing unit 38 including a pulse wave detection means for obtaining a pulse wave signal superimposed on the cuff pressure signal, A cuff pressure processing unit 39 including a decompression unit, a blood pressure measurement unit 40 including a blood pressure detection unit that determines a blood pressure value from the pressure value of the ischemic air bag and a change in pulse wave signal, and a display control unit 41 that displays a measurement result. It is configured as shown. The control program of the central control unit 35 is built in the ROM. Furthermore, the central control unit 35 includes a display unit 37 that is a blood pressure display unit that displays a blood pressure value, a pump drive unit 48 that controls the drive of the pump 23, and a valve control that controls the opening and closing of the second open / close valve 16. A part 46, an electromagnetic orifice diameter control valve control part 48 for controlling the electromagnetic orifice diameter control valve 22, a valve control part 47 for opening / closing the first opening / closing valve 15-2 and the third opening / closing valve 15-1, and a dry battery. The power supply unit 43 including the power supply switch 42 is connected.

  In the above configuration, when the power switch 42 is turned on, power is supplied from the power supply unit 43, the contents of the program stored in the ROM are read, and each control necessary for blood pressure measurement can be performed. It is configured as follows.

  The cuff body 1 configured as described above can be used for various blood pressure measuring devices. For example, the blood pressure measurement device shown in FIG. 1 can be operated as shown in the flowchart of the blood pressure measurement routine in FIG. 2 by reading out a control program stored in advance by the central control device.

  First, the blood pressure measurement device is activated by turning on the power switch 42. In step ST1, the first on-off valve 15-2, the second on-off valve 16, and the third on-off valve 15-1 are opened. In step ST2, the electromagnetic orifice diameter control valve 22 is opened, so that the residual pressure and residual air in all the cuffs are exhausted, and zero-setting of the pressure cuff sensor 31 in a state where there is no residual pressure is performed (step ST3). ). Next, in step ST4, the first opening / closing valve and the third opening / closing valve are closed, and the electromagnetic orifice control valve 22 is fully closed.

  In the next step ST5, the pump 23 is activated. Then, in step ST6, it is determined whether or not the sub air bag has become a specified pressure which is an appropriate pressure at which the cuff edge effect of the ischemic air bag 8 is neglected. If it is determined that the specified pressure is reached, the process proceeds to step ST7, where the second on-off valve is closed. Then, in step ST8, the pressurization of the air bag 8 for the ischemia and the air bag 5 for detecting the pulse wave is started by opening the first open / close valve and the second open / close valve.

  Further, in step ST9, a fluid resistance 16 that suppresses the air flow rate against the ischemic air bag 8 and the pulse wave detecting air bag 5 until the pressure is about 40 mmHg higher than the expected systolic blood pressure set in advance. Blow air through. When the set pressure is detected in step ST9, the energization to the pressurizing pump 23 is turned off in step ST10. In step ST11, the electromagnetic orifice diameter control valve 22 starts depressurization at a depressurization speed of 2 to 3 mmHg / sec. Subsequently, in step ST12, a cuff pressure is obtained from the cuff pressure detection unit. In step ST13, pulse wave detection is started. The amplitude of the pulse wave detected in step ST14 and the cuff pressure when detected are paired and stored in the RAM 36 in time series. After detecting the maximum value of the pulse wave amplitude at step ST15, for example, a point where the amplitude suddenly becomes smaller than a specified value is detected, and the cuff pressure value at that time is detected as the diastolic blood pressure and stored in the RAM 36. To do. In step ST16, the electromagnetic orifice diameter control valve and the second on-off valve are fully opened to exhaust to atmospheric pressure. Also, a pair of the pulse wave amplitude and the cuff pressure value stored in time series in the RAM 36 in step ST17 is searched from the oldest measurement start time, and the pulse wave amplitude is suddenly stepped by 50% or more. The point that has become larger is detected, and the cuff pressure value at that time is stored in the RAM 36 as the systolic blood pressure. The systolic blood pressure value and the diastolic blood pressure value stored in step ST18 are displayed on the display unit 37, and the series of blood pressure measurement assistance is completed.

  Although the above control method demonstrated the suitable Example of the blood-pressure measuring apparatus of this invention, this invention is not limited to these.

  As described above, the pulse wave amplitude generated when the cuff pressure is higher than the systolic blood pressure can be reduced, and the pulse pulse wave on the cuff distal side generated when the cuff pressure becomes lower than the systolic blood pressure is expressed as S. Since the / N ratio can be detected for detection, the measurement accuracy of systolic blood pressure is greatly improved. The cuff edge effect is greatly affected by the amount of air in the sub-air bag. However, if the sub-air bag is pressurized too much, the vascular pressure is too strong and the pulsed pulse wave becomes weak. It will be measured low. However, if the pressure is insufficient, the cuff edge effect cannot be sufficiently reduced. Therefore, by controlling the opening / closing of the first opening / closing valve, the third opening / closing valve, and the second opening / closing valve as described above, the optimum pressure control of the sub air bag is possible. Can be pressurized. For this reason, the cuff upstream side pulse wave that becomes an obstacle to the measurement of systolic blood pressure when the cuff pressure is higher than the systolic blood pressure can be made smaller than that of the double cuff method. In addition, by using electromagnetic bypass valves as the first open / close valve, second open / close valve, and third open / close valve, the piping can be made compact and the drive control can be easily performed, so a small blood pressure measuring device is realized. It has become possible. In addition, by connecting an air buffer tank (not shown) to the pulse wave detection air bag, the phenomenon that the pulse wave upstream of the cuff is detected by the pulse wave detection unit via the air bag is reduced. The S / N ratio of the systolic blood pressure measurement was improved.

It is a block diagram which shows the blood pressure measuring device of one Embodiment of this invention. , 2 is an operation explanatory flowchart of the blood pressure measurement device in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cuff body 2 Cuff member 8 Air bag 7 for ischemia Sub air bag 5 Air bag 15 for pulse wave detection First open / close valve 16 Second open / close valve 15-1 Third open / close valve 23 Pump (pressurizing / depressurizing means)
31 Pressure sensor (cuff pressure detection means)
11, 11a First piping 12, 12a Second piping 13, 13a Third piping 14 Fluid resistor 22 Orifice diameter variable solenoid valve

Claims (5)

A cuff member provided detachably with respect to the blood pressure measurement site;
An air bag for ischemia that is contained in the cuff member and compresses the blood pressure measurement site;
A sub-air bag that is laid on the opposite side of the blood pressure measurement site of the blood bag for blood pressure measurement and that assists the compression of the air bag for blood pressure measurement on the heart side of the blood pressure measurement site;
A cuff main body comprising a pulse wave detection air bag that is laid on the blood pressure measurement site in contact with the blood pressure measurement site and compresses the blood vessel downstream side of the blood pressure measurement site and detects a pulse wave generated on the downstream side When,
Pressurizing and depressurizing means connected via a pipe and an open / close valve to pressurize and depressurize the cuff body;
A cuff pressure detecting means for obtaining a cuff pressure signal from a pressure change of the pulse wave detecting air bag and the blood pressure preventing air bag,
The piping is
A first pipe connected via a first on-off valve between the blood-insufficating air bag and the pressure-intensifying means;
A second pipe connected via a second on-off valve between the sub air bag and the pressure-increasing / decreasing means;
A third pipe for connecting the pulse wave detecting air bag and the cuff pressure detecting means via a third on-off valve;
Between the first pipe connected to the air bag for ischemia and the third pipe connected to the air bag for pulse wave detection is provided with a bypass flow path consisting of a first fluid resistance,
Pulse wave detection means for detecting a pulse wave superimposed on the cuff pressure signal and obtaining a pulse wave signal;
Blood pressure determining means for determining a blood pressure value based on the cuff pressure signal and the pulse wave signal;
Display means for displaying the blood pressure value;
Before pressurizing the air bag for ischemia and the air bag for pulse wave detection, the first open / close valve and the third open / close valve are closed, and the second open / close valve is opened to bring the sub air bag to a specified pressure. The second open / close valve is closed while the second open / close valve is closed, the amount of air in the sub air bag is adjusted, and the second open / close valve is closed while blood pressure is measured. Blood pressure measuring device.   2. The blood pressure measurement device according to claim 1, wherein the second open / close valve is opened at the end of blood pressure measurement or before the blood pressure measurement is started to exhaust air in the sub-air bag.   The blood pressure measuring device according to claim 1, wherein the first on-off valve, the second on-off valve, and the third on-off valve are electromagnetic valves.   The blood pressure measuring device according to claim 1, wherein an air tank is connected to the third pipe. A cuff member provided detachably with respect to the blood pressure measurement site;
An air bag for ischemia that is contained in the cuff member and compresses the blood pressure measurement site;
A sub-air bag that is laid on the opposite side of the blood pressure measurement site of the blood bag for blood pressure measurement and that assists the compression of the air bag for blood pressure measurement on the heart side of the blood pressure measurement site;
Pressurizing and depressurizing means connected via a pipe and an open / close valve to pressurize and depressurize the cuff member;
A cuff pressure detection means for obtaining a cuff pressure signal from the pressure change of the air bag for ischemia;
The piping is
A first pipe connected via a first on-off valve between the blood-insufficating air bag and the pressure-increasing / decreasing means;
A second pipe connected via a second on-off valve between the sub air bag and the pressure-increasing / decreasing means;
A third pipe connecting the pulse wave detection air bag and the cuff pressure detecting means via a third on-off valve;
Pulse wave detection means for detecting a pulse wave superimposed on the cuff pressure signal and obtaining a pulse wave signal;
Blood pressure determining means for determining a blood pressure value based on the cuff pressure signal and the pulse wave signal;
A blood pressure measuring device comprising: display means for displaying the blood pressure value;
Before pressurizing the air bag for ischemia, the first open / close valve and the second open / close valve are closed, the third open / close valve is opened, and the sub air bag is pressurized until it reaches a specified pressure. 2. The blood pressure measuring device according to claim 1, wherein the second on-off valve is closed while the close valve is closed, the air amount of the sub air bag is adjusted, and the blood pressure is measured.

Images