JP2009101055A - Blood pressure measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blood pressure measuring apparatus capable of reducing the influence of an individual difference on systolic blood pressure measurement accuracy and the influence of a measuring method including the way of winding a cuff or the like. <P>SOLUTION: The blood pressure measuring apparatus includes a cuff main body comprising an air bag for ischemia, a sub air bag for pressurizing the heart side of the blood vessel of a blood pressure measuring part and a pulse wave detection air bag for detecting pulse waves, a means for pressurizing/depressurizing the cuff main body, a cuff pressure detection means, a pulse wave detection means, and a means for displaying a blood pressure value. The blood pressure measuring apparatus has first piping connected between the pulse wave detection air bag and the pressurizing/depressurizing means, second piping connected between the air bag for ischemia and the pressurizing/depressurizing means and connected with the cuff pressure detection means through a fluid resistor, and third piping connected between the sub air bag and the pressurizing/depressurizing means through an on-off valve. When detecting the pulse waves required for blood pressure measurement in the pulse wave detection means, the on-off valve is turned to a closed state, and a series of pulse wave waveform changes that occur are obtained as pulse wave signals by the pulse wave detection means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a blood pressure measurement device and relates to a technique for measuring blood pressure by an oscillometric method.

The method of obtaining systolic blood pressure in the blood pressure measurement method using an ischemic cuff is to lower the arterial blood flow after stopping the arterial blood flow by raising the cuff pressure above the systolic blood pressure, which is the highest pressure in the artery. In this case, the phenomenon is detected by detecting the phenomenon in which blood flow begins to flow when the blood vessel pressure and the cuff pressure coincide.

  In the case of an oscillometric sphygmomanometer, the cuff pressure is once increased to a pressure higher than the systolic blood pressure, and when the cuff pressure is gradually decreased, the arterial vibration generated based on the volume change of the artery is detected, The blood pressure was determined by the change in amplitude of the vibration.

  In contrast, the widely used Korotkoff method (auscultation method), like the oscillometric method, increased the cuff pressure above the systolic blood pressure and once stopped the blood flow, then gradually decreased the cuff pressure. When the Korotkoff sound generated at the time when the blood flow once stopped is detected is detected at the peripheral side downstream of the cuff, the internal pressure of the cuff for that time is obtained as the systolic blood pressure value (maximum blood pressure), and Korotkoff The internal pressure of the cuff when the sound disappears is obtained as the diastolic blood pressure value (minimum blood pressure).

  The oscillometric method described above is a method for obtaining a phenomenon in which blood flow is resumed from a pressure change superimposed on a cuff pressure generated by a volume change of an artery under the cuff. This eliminates the need for a microphone or stethoscope for detecting Korotkoff sound, which is necessary in the Korotkoff method, and therefore has the advantage of having fewer parts and lowering manufacturing costs than the Korotkoff method.

  In addition, the Korotkoff sphygmomanometer is a method close to the blood pressure measurement method using the above-described ischemic cuff, but noise (cuff cloth, cuff tube noise) generated during blood pressure measurement, air conditioning equipment and human Vibration from the outside, such as voice, has a drawback that it is vulnerable to noise because the frequency component of noise is close to the frequency component of Korotkoff sound.

  On the other hand, the frequency component of the pressure fluctuation used in the oscillometric method is considerably lower than the frequency component of the Korotkoff sound, and greatly deviates from the noise frequency generated during blood pressure measurement. For this reason, the oscillometric method has an advantage that it is hardly affected by noise. Compared to the Korotkoff method, where the alignment of the stethoscope or the microphone mounted on the cuff and the artery is important to make the detection sensitivity of Korotkoff sound constant, the oscillometric method is a vibration detection sensor for the entire cuff. Therefore, even if there is a slight displacement of the cuff, it is a method that can be measured sufficiently. Therefore, the usability is high, and this method is suitable for use as an automatic sphygmomanometer used at home.

  However, the oscillometric method has a problem regarding detection of systolic blood pressure (maximum blood pressure value) due to the cuff blood vessel compression characteristics. The cuff air bag is wrapped around the measurement site, for example, the upper arm, and when the air bag is pressurized, the force that compresses the upper arm is the pressure that reflects the cuff pressure at the center in the width direction of the air bag (longitudinal direction of the upper arm) However, if it is shifted from the center to the side of the air bag end (longitudinal direction of the upper arm), the compression force reflecting the cuff pressure cannot be obtained, and the compression force gradually increases from the center toward the end of the air bag. It shows a compression characteristic (cuff edge effect) that decreases and becomes zero at the end.

  Due to such compression characteristics, the cuff pressure is increased more than the systolic blood pressure, the cuff pressure is gradually decreased from the ischemic state, and it is the timing to measure the systolic blood pressure. When it is slightly higher, blood flow is stopped only at the center of the cuff. As a result, a phenomenon occurs in which the blood flow enters and returns from the upstream portion of the cuff to the central portion of the cuff in synchronization with the pulsation of the heart. Due to this phenomenon, the pulse wave has already been detected since the cuff pressure is higher than the systolic blood pressure, and there is a problem that the pulse wave for detecting that the cuff pressure has become lower than the systolic blood pressure cannot be accurately detected.

  In order to solve the above-mentioned problems in detecting the blood flow resumption phenomenon, conventionally, the following measures have been taken. When the pressure of the cuff is lowered from the systolic blood pressure, the time during which the arterial pressure becomes higher than the pressure of the cuff becomes longer within one pulsation cycle, and the volume change on the downstream side under the cuff increases. Amplitude increases. Further, although depending on the degree of congestion, if the intravascular pressure at the peripheral portion of the artery is higher than the cuff pressure, the pressure reflection phenomenon from the periphery occurs, and the pulse wave suddenly increases due to this reflection.

  As the cuff pressure is further reduced, the time during which the blood pressure in the peripheral region becomes larger than the internal pressure in the cuff becomes longer, and the time when the blood vessel is closed within one pulsation cycle is about to disappear. The blood vessel under the cuff is almost fully opened, and a phenomenon occurs in which the amplitude of the pulse wave is maximized.

  In the oscillometric method, the change in blood vessel volume under the cuff at the measurement timing of systolic blood pressure is limited to the blood vessel upstream of the central part under the cuff, with the central and downstream blood vessels capped. Is a state where the full opening and the pressure closing are repeated, corresponding to about 50% of the entire blood vessel volume under the cuff. For this reason, a method is adopted in which the cuff pressure value at the timing when the pulse wave amplitude is about 50% of the detected maximum pulse wave amplitude is used as the systolic blood pressure.

  However, this ratio depends on the cuff air due to the unbalance of the upstream and downstream volumes that contribute to the formation of the pulse wave under the cuff caused by the variation in the blood vessel holding force under the cuff due to how the cuff is wound, and the strength of the cuff. It is affected by variations in the relationship between the cuff pressure and compliance generated due to the difference in quantity, and variations in the increase in intravascular pressure at the peripheral site related to the magnitude of the maximum pulse wave amplitude. In addition, when the blood pressure measurement is repeated a plurality of times, the degree of congestion due to the short repetition time of the blood pressure measurement affects the increase in the intravascular pressure at the peripheral site. These are also largely dependent on the blood pressure value of the living body, the thickness of the blood vessels, the elastic characteristics, and the poor peripheral circulation, which causes individual differences.

In order to solve these problems, a double cuff method has been proposed. In this double cuff system, a blood-breaking air bag used for compressing a blood vessel and a pulse-wave detection air bag for detecting only a pulse wave at a central portion under the blood-breaking air bag are provided separately from the blood-breaking air bag. According to the double cuff method, the influence of the pulse wave based on the volume change on the upstream side under the air bag for ischemia at the time of measuring the systolic blood pressure, which is a problem in the oscillometric method, can be reduced. An improvement has been made that the downstream volume change under the air bag for ischemia can be detected with a better S / N ratio than the conventional oscillometric method (Patent Document 1: Japanese Patent Laid-Open No. 2000-287945). However, even in the double cuff system, when the cuff pressure is higher than the systolic blood pressure, blood flow enters from the upstream side of the cuff to the cuff central portion where the pulse wave detection cuff is located. In the double cuff system, a damper is disposed between the pulse wave detection air bag and the blood pressure prevention air bag upstream of the blood pressure prevention air bag to attenuate vibrations to the blood pressure prevention air bag and the pulse wave detection air bag. Although measures are being taken, there was a limit to eliminating the effects of blood vessels upstream of the cuff. In order to solve these problems, a triple cuff system has been devised in which a third sub-air bag is arranged upstream of the ischemic air bag in order to increase the pressure on the upstream side of the double cuff type ischemic air bag. .
JP 2000-287945 A

In the case of the triple cuff method, the cuff edge effect (a phenomenon in which the force that the cuff presses against the measurement site decreases from the central part of the cuff toward both ends) is located on the upstream side (heart side) when attached to the measurement site. A third air bag (sub-air bag) is arranged on the side to be made. If the amount of air into the sub air bag is too large, there will be an obstacle to compression, and if it is too small, the cuff edge effect will not be reduced.

In order to solve the above-described problem, according to the blood pressure measurement device of the present invention, the cuff member that is detachably attached to the blood pressure measurement site, and the entire blood pressure measurement site that is laid on the side of the cuff member that contacts the blood pressure measurement site The side of the blood pressure measuring part of the blood pressure measuring part that is laid on the side of the blood pressure measuring part that presses against the blood pressure measuring part and the part of the blood pressure measuring part that contacts the blood pressure measuring part A cuff body composed of a pulse wave detection air bag for detecting a pulse wave that is laid in the central part of the blood vessel of the blood pressure measurement site of the blood pressure and that is caused by blood flow flowing to the peripheral side of the blood pressure measurement site; Pressurizing and depressurizing means for pressurizing and depressurizing, cuff pressure detecting means for obtaining cuff pressure signals of the pulse wave detecting air bag and the ischemic air bag, and a cuff pressure for storing the cuff pressure signal detected by the cuff pressure detecting means Storage means and A pulse wave detection means for obtaining a superimposed pulse wave signal from the pressure signal; a storage means for storing the pressure signal and the pulse wave signal; a blood pressure determination means for determining a blood pressure value based on the pressure signal and the pulse wave signal; A blood pressure display device for displaying a blood pressure value, wherein the first pipe connected between the pulse wave detection air bag and the cuff pressure detection device, the ischemic air bag, The second piping connected between the pressure reducing means and the cuff pressure detecting means and the fluid resistor, and connected between the sub air bag and the pressure increasing / decreasing means via the open / close valve. When a pulse wave required for blood pressure measurement is detected by the pulse wave detection means, the on-off valve is closed and a series of generated pulse wave waveform changes as a pulse wave signal by the pulse wave detection means To make it possible to measure systolic blood pressure and / or diastolic blood pressure It is characterized by a door.

  In the triple cuff sphygmomanometer described above, if the amount of air injected into the sub-air bag is too large, the blood pressure of the air bag for ischemia will be weakened, and if it is too small, the effect of suppressing the cuff edge effect will be reduced. In order to limit the amount of air in the sub air bag by pressure, when the pressure reaches the specified value from the start of pressurization, or when the specified time has been reached, the sub air bag piping is closed by the open / close valve, and the air amount in the sub air bag By taking measures to reduce the amount of air in the sub-air bag, it is possible to cause damage to the vascular pressure upstream of the air bag for ischemia due to excessive filling of the air bag. The lack of vascular compression has been eliminated, and the cuff edge effect has been reduced most effectively.

  In addition, by connecting a balloon-like balloon whose volume is increased by pressure to the pipe between the sub air bag and the closing / closing valve, the blood flow to the cuff upstream when the cuff pressure is greater than the systolic blood pressure. The vibration generated by the approach can be absorbed and attenuated by the sub air bag, and the volume vibration on the upstream side of the cuff detected by the sub air bag is transmitted to the air bag for ischemia, and the vibration of the air bag for ischemia is detected as a pulse wave. It is possible to alleviate the phenomenon of being transmitted to the air bag and finally entering the pulse wave detection unit.

Also, when the cuff is loosely wound around the measurement site and when it is tightly wound, when the cuff pressure is increased to the same pressure value, the amount of air in the sub air bag varies, and the cuff edge due to the sub air bag Variation occurs in effect reduction effect. In order to eliminate the above variation, first, pressurization is started with the on-off valve closed, and the cuff is stopped by waiting until the pressure has reached the first specified value or the first specified time since the start of pressurization. The dead space generated between the measurement site and the cuff due to the winding method is made almost constant. After the dead space is in a certain state, the on-off valve is opened to start air injection into the sub air bag, and the second specified value higher than the first specified value is set or opened. When the second specified time has elapsed, the on-off valve is closed and an appropriate amount of air is injected into the sub air bag. As a result, even if the cuff winding method is not constant, as described above, by devising the air amount of the sub air bag to a specified amount, the air bag for ischemia caused by excessive air filling in the sub air bag The cuff edge effect can be most effectively reduced by eliminating the occurrence of vascular compression disorder on the upstream side and the lack of vascular pressure on the upstream side of the air bag for ischemia due to insufficient air volume in the sub-air bag.

  Embodiments of the present invention will be described below with reference to the accompanying drawings, but it is needless to say that the present invention is not limited to the embodiments. FIG. 1 is a block diagram showing a blood pressure measurement device according to an embodiment of the present invention.

  Hereinafter, embodiments of a blood pressure measurement device of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a blood pressure measurement device. In this figure, the cuff body 1 is provided with a cloth cuff member 2 that is detachably provided to a blood pressure measurement site including the upper arm, and is shown by a broken line at the end of the cuff member 2 on the measurement site contact side. The male (hook-type) hook-and-loop fastener 3 is provided, and the female (loop-type) hook-and-loop fastener 4 having the same position and area as the blood-blocking air bag on the surface opposite to the measurement site contact side is provided. The cuff member 2 is wound around the upper arm as shown in the figure, and the hook-and-loop fastener 1 is locked so that the cuff body 1 can be attached and detached. Here, the hook-and-loop fastener is merely an example, and other members may be used, or a configuration in which the cuff body is provided in a method of forming a tubular shape and inserting the upper arm may be employed.

  Inside the cuff member 2, a hemostasis air bag 8 shown by a broken line is laid to press the entire blood pressure measurement site. In addition, a sub air bag 7 shown in a broken line having a narrower width is laid on the side in contact with the blood pressure measurement site of the ischemic air bladder 8 so as to compress the heart H side of the blood pressure measurement site. Between the sub air bag 7 and the ischemic air bag 8, a first buffer member 9 that attenuates vibration of the sub air bag 7 is provided.

  Further, a pulse wave detecting air bag 6 shown in a broken line is laid on the side of the blood pressure measuring part 8 in contact with the blood pressure measuring part, compresses the blood vessel downstream side of the blood pressure measuring part, and detects the downstream pulse wave. For the purpose of preventing the vibration of the air bag 8 for ischemia from being transmitted to the air bag 6 for detecting the pulse wave and for the purpose of improving the close contact of the air bag 6 for detecting the pulse wave to the living body, ) 5 is laid to constitute the cuff body 1.

  In order to pressurize and depressurize the cuff body 1, the blood bag 8 for the blood cuff of the cuff body 1 is connected to the second pipe 12 and the pipe 15, and the air bag 6 for detecting the pulse wave of the cuff body 1 is the first. Via the pipe 11 and the fluid resistor 14, and with the sub air bag 7 of the cuff body 1 through the third pipe 13 and the on-off valve 16, the pump 23 which is the pressure-increasing / decreasing means and the quick exhaust valve / constant speed exhaust. A valve 22 is connected. A pressure sensor 31, which is a cuff pressure detection means for obtaining a cuff pressure signal from a pressure change of the pulse wave detection air bladder 6, is connected to the pulse wave detection air bladder 6 through the first pipe 11. A third pipe 13 is connected to the sub air bag 7.

  Each of the first pipe 11, the second pipe 12, and the third pipe 13 is made of a soft tube, and is detachably provided from the main body 30 via the connector 10. Further, the third pipe 13 is preferably connected to a damper device 18 (shown by a broken line) that further increases the volume in proportion to the pressure and smoothes the pressure.

  A pump 23 and a quick exhaust valve / constant speed exhaust valve 22 are connected to the cross branch portion 20. The rapid exhaust valve / constant speed exhaust valve 22 is connected to the control unit 48, and the on-off valve 16 is connected to the control unit 46, and the quick exhaust valve / constant speed exhaust valve 22 is an electromagnetic valve in response to a command from the central control unit 35. The opening area is controlled, and the on-off valve 16 is opened / closed by an electromagnetic on-off valve.

  The pump 23 is driven in accordance with power supply from a pump drive unit 49 connected to the motor M, introduces outside air into the pump through the opening 23a, pressurizes the compressed air through the cross-branching unit 20, and pressurizes the compressed air. Is sent to the piping 15 and the third piping portion 13a so that each air bag can be pressurized.

  The rapid exhaust valve / constant speed exhaust valve 22 has a structure in which the opening area is varied by the strength of electromagnetic force in order to realize a pressure reduction speed of 2 to 4 mmHg per second, and by obtaining a PWM drive signal from the control unit 48. Arbitrary decompression speed can be set.

  Next, FIG. 2 is a cross-sectional view illustrating a state after the cuff body 1 is attached to the upper arm. In this figure, components and components that have already been described are denoted by the same reference numerals and description thereof is omitted. After the cuff body 1 is attached to the upper arm, the air bag 8 for ischemia compresses the entire blood vessel at the blood pressure measurement site. The sub air bag 7 is positioned on the heart H side. The pulse wave detection air bladder 6 is located on the artery on the cuff distal side.

  Further, a first buffer member 9 having a vibration transmission preventing function such as a foamed urethane resin is provided between the air bag 8 for ischemia and the sub air bag 7. Further, a similar second buffer member 5 is provided between the ischemic air bag 8 and the pulse wave detecting air bag 6. Each buffer member is configured to form an air layer between the ischemic air bag 8 and each air bag so that vibration due to the heartbeat of the ischemic air bag can be prevented from being transmitted to each air bag. Still good.

  In particular, if each air bag is inflated and the air layer is not collapsed, a damping characteristic that absorbs vibrations close to the heartbeat frequency can be obtained. That is, when the internal pressure of the ischemic air bag 8 is slightly lower than the systolic blood pressure, vibration due to a change in the blood vessel volume on the upstream side from the sub air bag 7 to the ischemic air bag 8, and the ischemic air When transmission from the bag 8 to the pulse wave detection air bag 6 is reduced, the S / N ratio of detection of the pulse wave generated on the downstream side of the cuff blood vessel can be increased. In addition, the structure which does not provide each buffer member may be sufficient.

  Referring to FIG. 1 again, the ischemic pressure signal from the ischemic air bag 8 whose pulse wave component is attenuated and the pressure change of the pulse wave detecting air bag 6 via the fluid resistor 14 is a cuff pressure detecting means. Input to the pressure sensor 31. The pressure sensor 31 is connected to a pressure measuring unit 32 that converts it into an analog electric signal. The pressure measuring unit 32 is further connected to an A / D converter 33, and the digital signal is sent to the central control unit 35. It is configured to output as a signal.

  A central control unit 35 including this computer includes a RAM 38 for reading and writing measurement data and analysis results, a pulse wave processing unit 39 for detecting a superimposed pulse wave signal from the cuff pressure signal, and a cuff (blood bag for ischemia). , Pulse wave detection air bag, sub air bag) cuff pressure control unit 40 for increasing and decreasing pressure, blood pressure measurement unit 41 for determining blood pressure from detected pulse wave change and ischemic cuff pressure signal, measured blood pressure value The display control unit for displaying the pulse value, the pulse wave shape and the like on the display means 37 includes a ROM 36 that stores various control programs that can be read by the central control unit 35. The RAM 38 also functions as a work area for programs processed in the central control unit 35.

  The central control unit 35 is connected to a liquid crystal display unit 37 that is a display unit that displays a blood pressure value, and each drive unit that performs each of the drive controls described above. Further, the power supply from the power supply unit 43 including the dry battery is configured such that each operation necessary for blood pressure measurement can be performed by supplying power to each unit by the central control unit 35 by operating the switch 42.

  In the blood pressure measurement device configured as described above, various control programs stored in advance in the ROM 36 can be read out by the central control unit 35 and operated as shown in the flowchart of the following blood pressure measurement routine.

FIG. 3A is a flowchart for explaining the operation of the pressurizing routine when the on-off valve 16 is opened from the open state at the start of pressurization. First, the cuff body 1 is attached to the upper arm as shown in FIG.

  When the measurement start switch 42 (not shown) is pressed, the opening area of the quick exhaust valve / constant speed exhaust valve 22 is fully opened, and the on-off valve 16 is opened to exhaust each air bag. When exhaust of the residual air in each air bag is completed, the pressure sensor 31 is zero-set (initialized).

  Next, in step S2, the on-off valve 16 is kept open. On the other hand, the rapid exhaust valve / constant speed exhaust valve 22 is fully closed. With the above, preparation for pressurization of the cuff (the air bag for ischemia, the air bag for detecting the pulse wave, the sub air bag) is completed, and the pump 23 is energized in step S3.

  Subsequently, in step S4, it is checked whether or not the specified pressure (pressure that inflates the sub-air bag 7 so as to reduce the cuff edge effect without causing obstruction of the ischemia) is reached. To close the on-off valve 16.

  In step S3, the pump 23 is continuously driven so that the pressure of the air bag 8 for ischemia becomes a set pressure value that is 20 to 30 mmHg higher than the expected systolic blood pressure.

  In step S6, it is determined whether or not the cuff pressure has reached the pressurization set value. When the cuff pressure reaches the pressurization set value, the process proceeds to step S7, and after stopping the pump drive, the process proceeds to the cuff decompression routine.

FIG. 3B is a flowchart for explaining the operation of the pressurizing routine when the on-off valve 16 is closed from the time when the pressurization is started. First, the cuff body 1 is attached to the upper arm as shown in FIG.

In step S101, the quick exhaust valve / constant speed exhaust valve 22 and the on-off valve 16 are opened, and zero pressure setting is performed. Next, in step S102, the quick exhaust valve / constant speed exhaust valve 22 is fully closed. In step S103, the on-off valve 16 is closed, and in step S104, energization of the pump 23 is started, and the pump 23 is driven and pressurized. In step S105, it is checked whether or not the specified pressure is 1 (pressure that makes the dead space between the measurement site and the ischemic cuff constant). When the specified pressure 1 is reached, the on-off valve 16 is opened in step S106.

In step S107, it is checked whether or not the specified pressure 2 (pressure that inflates the sub air bag 7 to an appropriate amount that can reduce the cuff edge effect) is reached. If the specified pressure 2 is reached, the on-off valve 16 is closed in step S108.

In step S109, it is checked whether or not the pressure of the ischemic bladder 8 has reached a pressure setting value that is 20 to 30 mmHg higher than the expected systolic blood pressure value.

When the pressurization set value is reached, in step S10, the power supply to the pump 23 is stopped and the drive is stopped (step S110), the cuff pressurization is stopped, and the process proceeds to the cuff decompression routine (step S111).

  In the cuff decompression routine of FIG. 4, when the process proceeds to step S20, constant speed exhaust is started by the rapid exhaust valve / constant speed exhaust valve 22. The cuff pressure controller 40 uses the signal from the cuff pressure detector to vary the opening area of the rapid exhaust valve / constant speed exhaust valve 22 so that the decompression speed becomes 2 to 3 mmHg / sec. Is done.

Following this, the cuff pressure is detected from the cuff detection means 31 in step S21. In the next step S22, detection of a pulse wave (pulse wave waveform shape) is started. Next, proceeding to step S23, the pulse wave bottom point (B) and the maximum change point (A) between the peak points in the pulse wave waveform change of the pulse wave signal detected by the pulse wave processing unit 39 are calculated, A time T from the bottom point to the maximum change point is obtained, and the cuff pressure value (bottom point pressure value) and the time T are set as one set and stored in the RAM 38. 6A and 6B show the maximum change point (A) between the bottom point (B) of the pulse wave and the peak point in the pulse wave signal.

In step S24, the stored time T of the RAM 38 is checked, and the cuff pressure value at the point where the time T has rapidly increased to a specified value or more is determined as the systolic blood pressure value (maximum blood pressure value) and stored in the RAM 38.

Subsequently, the cuff pressure is obtained from the cuff pressure detecting means 31 again in step S25, and the detection of the pulse wave (pulse wave waveform shape) is started again in the next step S26. Next, in step S27, the pulse wave bottom point (B) and the maximum change point (A) between the peak points in the pulse wave change of the pulse wave signal detected by the pulse wave processing unit 39 are calculated, and from the bottom point. The time T to the maximum change point is obtained, and the cuff pressure value (bottom point pressure value) and the time T are set as one set and stored in the RAM 38. In step S28, the stored time T of the RAM 38 is examined, and the cuff pressure value at the point where the decrease change of the time T becomes equal to or less than the specified value is stored in the RAM 38 as the diastolic blood pressure (minimum blood pressure value). In step S29, the on-off valve 16 is opened, the exhaust valve / constant speed exhaust valve 22 is fully opened, and the exhaust is quickly exhausted to bring the cuff pressure to atmospheric pressure. In step S30, the blood pressure value recorded in the RAM 38 is displayed, and the series of blood pressure measurement operations is completed. In addition to displaying the systolic blood pressure value and the diastolic blood pressure value, a pulse wave signal (pulse wave waveform signal) is displayed on the first axis of the pressure signal stored in the RAM 38 as the storage means for the pulse wave waveform change. Two-dimensional display as the second axis, and in conjunction with this two-dimensional display, the measured systolic blood pressure value, the index indicating that it is a diastolic blood pressure value is displayed with characters or symbols, the contraction measured by the user The validity of the systolic blood pressure value and the diastolic blood pressure value can be easily visually confirmed. In the above-described embodiment, the diastolic blood pressure value is calculated and calculated in a state where pressure is reduced after cuff pressurization. However, a pulse wave (pulse wave shape) is stored in the RAM 38 at the time of cuff pressurization, and after the cuff is depressurized. After calculating and calculating the systolic blood pressure value, all the cuffs (air bags) may be immediately opened to the atmospheric pressure, and the systolic blood pressure value and the diastolic blood pressure value may be displayed on the display unit.

  Finally, FIGS. 5A and 5B are an external perspective view and a three-dimensional exploded view of the damper device 18, and FIG. 5C is a piping diagram.

  The damper device 18 is completed from a main body 18a integrally formed with nipples 18d and 18c connected to the third pipe 13, an elastic film 18b, and a flange member 18f. Specifically, the elastic film 18b is molded into a thin wall shape using a material such as natural rubber or silicone rubber, and is prepared as a hat-shaped body as shown in the figure. The elastic film 18b is integrally formed with a flange, and is completed by screwing and fixing the flange between the main body 18a and the flange member 18f. According to the damper device 18 described above, the volume increases in proportion to the pressure and the pressure can be smoothed. Therefore, the sub-air bag 7 can be pressurized and decompressed more stably.

It is a character knife block diagram of the blood pressure measuring device of one embodiment of the present invention. It is sectional drawing which illustrated the mode after mounting the cuff main body 1 to the upper arm. (A) is an operation | movement explanatory flowchart of 1 aspect (cuff pressurization from the on-off valve 16 being an open state) of the pressurization routine of a blood-pressure measuring device. (B) is an operation explanatory flowchart of another aspect of the cuff pressurization routine of the blood pressure measurement device (cuff pressurization when the on-off valve 16 is closed). It is a flowchart explaining operation | movement of the cuff decompression routine of a blood-pressure measuring device. (A)-(b) is the external appearance perspective view and three-dimensional exploded view of the damper apparatus 18, (c) is a piping diagram. It is a figure which shows the bottom point (B) of a pulse wave, and the maximum change point (A) between peak points.

Explanation of symbols

1 cuff body, 2 cuff member, 6 pulse wave detection air bag, 7 sub air bag, 8 blood-blocking air bag, 11 first piping, 12 second piping, 13 third piping, 14 fluid resistor, 16 on-off valve , 18 damper device, 22 quick exhaust valve / constant speed exhaust valve, 23 pump (pressure increasing / decreasing means), 31 pressure sensor (cuff pressure detecting means)

Claims (4)

A cuff member that is detachably attached to the blood pressure measurement site, an air bag for ischemia that is laid on the side of the cuff member that contacts the blood pressure measurement site, and compresses the entire blood pressure measurement site, and a blood pressure measurement site for the air bag for ischemia A sub-air bag that is laid on the contact side and compresses the heart side of the blood vessel of the blood pressure measurement site, and a blood pressure laid on the blood pressure measurement site of the blood pressure measurement site on the side of the blood pressure measurement site that is in contact with the blood pressure measurement site slightly downstream A cuff body composed of a pulse wave detection air bag for detecting a pulse wave generated by blood flow flowing to the peripheral side of the measurement site;
Pressurizing and depressurizing means for pressurizing and depressurizing the cuff body;
Cuff pressure detecting means for obtaining cuff pressure signals of the pulse wave detecting air bag and the ischemic air bag;
Cuff pressure storage means for storing a cuff pressure signal detected by the cuff pressure detection means;
Pulse wave detection means for obtaining a superimposed pulse wave signal from the cuff pressure signal;
Storage means for storing the pressure signal and the pulse wave signal;
Blood pressure determining means for determining a blood pressure value based on the pressure signal and the pulse wave signal;
A blood pressure measurement device comprising: a blood pressure display means for displaying the blood pressure value;
A first pipe connected between the pulse wave detection air bladder and the cuff pressure detection means;
A second pipe connected between the air bag for ischemia and the pressure increasing / decreasing means, and connected to the cuff pressure detecting means via a fluid resistor;
A third pipe connected via an on-off valve between the sub air bag and the pressure-increasing / decreasing means;
When detecting the pulse wave necessary for blood pressure measurement by the pulse wave detecting means, the on-off valve is closed, and a series of generated pulse wave waveform changes are obtained as the pulse wave signal by the pulse wave detecting means. A blood pressure measuring device capable of measuring systolic blood pressure and diastolic blood pressure. Pressurization is started by the pressurizing means in a state where the on-off valve is opened, and the on-off valve is closed when a prescribed value is reached or when a prescribed time has elapsed since the start of pressurization. The blood pressure measurement device according to claim 1. Pressurization is started by the pressurizing means in a state where the on-off valve is closed, and when the cuff pressure reaches the first specified value, or when a specified time has elapsed since the start of pressurization, the on-off valve is The valve is opened and closed when the cuff pressure reaches a second specified value higher than the first specified value, or when a second specified time elapses after the on-off valve is opened. Item 1. The blood pressure measurement device according to item 1. The blood pressure measuring device according to claim 1, wherein a balloon whose volume is increased by pressure is provided between the on-off valve of the third pipe and the cuff body.

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