JP4943748B2 - Blood pressure measurement device, measurement method thereof, and storage medium - Google Patents

Description

The present invention relates to a blood pressure measuring apparatus using a blood pressure cuff which performs non-invasive blood pressure measurements using the oscillometric metric scheme relates to a blood pressure measurement equipment, especially used ischemic cuff.

  According to a conventional oscillometric sphygmomanometer, the volume of the artery located under the cuff while gradually increasing the cuff pressure to a pressure higher than the systolic blood pressure or lowering the pressure higher than the systolic blood pressure. Based on the change, the vibration of the cuff pressure was detected, and the blood pressure was determined by the change in the amplitude of the vibration.

  The method of obtaining systolic blood pressure in such a blood pressure measurement method using a cuff is to increase the cuff pressure above the systolic blood pressure, which is the highest pressure in the artery, while lowering the arterial blood flow while stopping it. Blood flow is obtained by detecting the phenomenon of flow.

  On the other hand, according to the Korotkoff method (auscultation method), which is widely used at present, the cuff pressure is raised above the systolic blood pressure to stop the blood flow, and then the cuff pressure is gradually lowered to reduce blood pressure. A systolic blood pressure value (maximum blood pressure value) is obtained by detecting a Korotkoff sound generated at the timing when flow resumes on the downstream side of the cuff.

  The oscillometric method is a method of capturing the phenomenon of blood flow resumption as cuff pressure oscillation based on arterial volume change under the cuff. For this reason, the oscillometric method does not require a sensor (including a stethoscope) for detecting the Korotkoff sound in comparison with the Korotkoff method.

  In the auscultation method, noise (cuff cloth, cuff tube rubbing sound, vibration) generated during blood pressure measurement has a drawback that the frequency component of noise is likely to be erroneously detected because it is close to the frequency component of Korotkoff sound. On the other hand, the frequency component of the pressure fluctuation at the time of the measurement of the oscillometric method is lower than the frequency component of the Korotkoff sound and greatly deviates from the noise frequency generated at the time of blood pressure measurement. In addition, since it is a method that can be measured even when there is a positional shift when the cuff is attached to the artery to be measured, it is mainly used for an automatic sphygmomanometer.

  However, the oscillometric method has a problem in detecting systolic blood pressure (maximum blood pressure value) due to the blood vessel compression characteristics of the Rivaroch cuff used in the cuff. In other words, the Rivaroch cuff can obtain a compression force reflecting the cuff pressure in the central portion in the width direction, but if it deviates from the central portion, a compression force reflecting the cuff pressure cannot be obtained, and from the central portion to the end of the cuff. The compression force gradually decreases, and the end portion exhibits a characteristic that becomes zero.

  Due to such characteristics, the blood flow is stopped at the center of the cuff when the cuff pressure is close to and slightly higher than the systolic blood pressure at the timing of measuring the systolic blood pressure. 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 before the generation of the pulse wave used to detect the blood flow resumption phenomenon to the downstream side (forearm side) of the cuff serving as the detection target of the systolic blood pressure.

  In addition, when the cuff pressure of the cuff becomes lower than the systolic blood pressure and the blood flow is resumed, a volume change due to the blood flow occurs downstream from the central part under the cuff. Because it is slightly lower, the blood vessel closes immediately after opening for a short time. At this time, the volume change on the downstream side under the cuff is very small compared to the volume change on the upstream side.

  The pulse wave detected by the oscillometric method is based on the volume change in which the upstream volume change under the cuff and the downstream volume change overlap, so only the change based on the resumption of blood flow is selected from the pulse wave. This is very difficult to detect, particularly when the blood flow is small. As described above, the oscillometric method causes the deterioration of the S / N ratio in the measurement of systolic blood pressure as compared with the Korotkoff method.

  In order to solve these problems in detecting the blood flow resumption phenomenon, conventionally, the following measures have been taken. When the pressure of the cuff is further lowered from the systolic blood pressure, the increase in the volume change on the downstream side under the cuff due to the increase in the time when the arterial pressure becomes higher than the pressure of the cuff in the heart pulsation cycle, The amplitude of the pulse wave gradually increases.

  Also, depending on the degree of congestion, when the intravascular pressure at the peripheral portion is higher than the cuff pressure, the pressure reflection from the periphery occurs, and the pulse wave suddenly increases from the cuff pressure 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 immediately before the time when the blood vessel is closed, the upstream region of the cuff and the blood vessel in the peripheral region are fully opened simultaneously. And the amplitude of the pulse wave is maximized.

  The volume change at this time is a change in the systolic blood pressure because the volume change under the cuff at the timing of measuring the systolic blood pressure is mainly a change upstream of the cuff center corresponding to 50% of the blood vessel volume under the cuff. It is about twice the time pulse wave amplitude. Utilizing this, a method is adopted in which the systolic blood pressure is set at a timing at which the pulse wave amplitude is about 50% of the maximum pulse wave amplitude.

  However, this ratio is influenced by the upstream and downstream volume imbalance, cuff compliance differences, the degree of increase in intravascular pressure at the peripheral site, and timing effects, which contribute to the formation of the pulse wave under the cuff due to how the cuff is wound. Receive. In addition, the increase in intravascular pressure at the peripheral site is affected by the degree of congestion due to the short time required for repeated blood pressure measurements. However, the blood pressure value, the degree of peripheral circulation, the peripheral blood vessels, Compliance has an impact.

A double cuff system has been devised to solve these problems. This double cuff method is a method in which an air bag for ischemia used for compressing a blood vessel and a detection air bag for detecting only a pulse wave at a central portion below the air bag for ischemia are provided separately from the ischemic function. According to this 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. It is possible to detect a change in volume on the downstream side under the air bag for ischemia with a high S / N ratio. (Patent Document 1)
However, at the detection timing of systolic blood pressure, blood flow that enters the upstream side under the air bag for ischemia may invade to the immediate vicinity of the air bag for pulse wave detection, which is detected by the air bag for pulse wave detection. In addition, since the pulse wave detection air bag is provided under the ischemic air bag, the cuff vibration based on the upstream volume change detected by the ischemic air bag is in contact with the cuff vibration. In some cases, a phenomenon that is noticeably transmitted to the pulse wave detection air bag may be seen, and the S / N ratio of the measurement of systolic blood pressure may be deteriorated.

Therefore, the pressure performance of the air bag for detecting the pulse wave is improved so that the blood flow entering from the upstream side of the air bag for detecting the pulse wave is not approached when the blood vessel is closed with the air bag for ischemia. A backing material is installed between the air bag for pulse wave detection and the air bag for ischemia, and a buffer material for damping the transmitted pulse wave from the air bag for ischemia is installed. There has also been proposed a buffer material for damping the pulse wave. (Patent Document 2)
However, according to this proposal, the compression force of the pulse wave detection air bag can be improved, but there is a limit to the extent to which the ischemic point is separated from the pulse wave detection air bag. In addition, since there is a limit to the damping characteristics of the members used, the relatively high frequency components of the pulse wave can be attenuated, but there are cases where the low components cannot be sufficiently attenuated. For this reason, the systolic blood pressure may not be detected with a good S / N ratio.
JP 2004-195056 A Japanese Patent Laid-Open No. 2004-321251

  Therefore, the present invention has been made in view of such a situation, and the influence of the volume change at the upstream portion of the blood-blocking air bag on the pulse wave detection air bag of the double cuff method, which is an improved version of the oscillometric method, is further improved. It aims at improving the S / N ratio for the detection of systolic blood pressure by eliminating effectively.

In order to solve the above-described problem, according to the blood pressure measurement device of the present invention, a blood-filling air bag that compresses an artery at a blood pressure measurement site, and the blood-pressure measurement site between the blood bag for blood pressure measurement and the living body when the blood pressure measurement device is mounted. A sub-air bag disposed closer to the heart than the substantially central portion of the ischemic air bag, and a substantially central portion of the ischemic air bag between the ischemic air bag and the living body when attached to a blood pressure measurement site. and air bag for detecting pulse waves that is arranged in a first fluid resistor connected between the sub air bag and air bag the ischemia, in parallel with the first fluid resistor, the input side A check valve having an output side connected to the sub-air bag side, a first pipe connected to the blood-stopping air bag, and a second fluid to the pulse-wave detecting air bag. A second pipe connected via a resistor, a cuff body attached to a blood pressure measurement site, and the cuff body A cuff pressure detection unit connected by the second pipe, a pressurization unit connected by the cuff body and the first pipe and pressurizing the cuff body, and a pressurization control unit for controlling the pressurization unit And connected to the cuff main body by the first pipe, and electrically connected to a decompression control unit for depressurizing the cuff main body and the cuff pressure detection unit, and converts a pulse wave into a detected pulse wave signal to detect A pulse wave detector that detects a pulse wave that is superimposed on the pulse wave signal; an output from the pulse wave detector; and a blood pressure detector that determines a blood pressure value based on a detected cuff pressure signal of the cuff pressure detector; A main body including a blood pressure display unit that displays a blood pressure value of the blood pressure detection unit.

  A second backing member including a packing material between the ischemic air bladder and the sub-air bag; and a second backing member including a packing material between the ischemic air bag and the pulse wave detecting air bag. It is characterized by arranging a backing member.

  A third backing member including a packing material is disposed between the air bag for ischemia and the cuff body.

  The first fluid resistor and the second fluid resistor have substantially the same fluid resistance.

A blood-filling air bag that compresses the artery at the blood pressure measurement site, and a sub that is disposed closer to the heart than the substantially central portion of the blood bag for blood pressure between the blood bag for blood pressure prevention and the living body when attached to the blood pressure measurement site the air bag, the air bag for detecting pulse waves that is arranged at a substantially central portion of the air bag the ischemia in between the ischemia air bag and the living when worn on a blood pressure measurement site, and the air bag the avascularization A first fluid resistor connected between the sub-air bladder, and in parallel with the first fluid resistor, its input side is connected to the blood-insufficing air bag side, and its output side is connected to the sub-air bag side A check valve, a first pipe connected to the air bag for ischemia, a second pipe connected to the pulse wave detection air bag via a second fluid resistor, and a blood pressure measurement site. A cuff body, a cuff pressure detector connected to the cuff body by the second pipe, and the cuff body, Connected by the first pipe, pressurizing means for pressurizing the cuff body, a pressurizing control unit for controlling the pressurizing means, and connected by the cuff body and the first pipe, A pressure reduction control unit configured to reduce pressure, a pulse wave detection unit that is electrically connected to the cuff pressure detection unit, converts a pulse wave into a detection pulse wave signal, and detects a pulse wave superimposed on the detection pulse wave signal; A blood pressure comprising: a blood pressure detection unit that determines a blood pressure value based on an output from the wave detection unit and a detection cuff pressure signal of the cuff pressure detection unit; and a blood pressure display unit that displays the blood pressure value of the blood pressure detection unit A measuring method of a measuring device, the step of compressing the artery via the pressurization control unit, the step of converting the pulse wave into a detected pulse wave signal by the pressure detection unit, and the decompression control unit The step of depressurizing the cuff assembly through the pulse wave detector, A step of detecting a pulse wave superimposed on the detected pulse wave signal; and a step of determining a blood pressure value in the blood pressure detection unit based on an output of the pulse wave detection unit and a detection cuff pressure signal of the cuff pressure detection unit. The blood pressure display unit includes a step of displaying a blood pressure value from the blood pressure detection unit.

Further, the air bag for ischemia for compressing the artery at the blood pressure measurement site and the air bag between the blood bag for ischemia and the living body when attached to the blood pressure measurement site are disposed closer to the heart than the substantially central portion of the air bag for ischemia. A sub-air bag, a pulse wave detection air bag disposed in a substantially central portion of the ischemic air bag between the ischemic air bag and the living body when mounted on a blood pressure measurement site, and the ischemic air bag A first fluid resistor connected between the sub-air bladder and the first fluid resistor in parallel with the first fluid resistor, the input side being the ischemic bladder side and the output side being the sub-air bladder side A check valve connected to the air bag, a first pipe connected to the air bag for ischemia, a second pipe connected to the air bag for pulse wave detection via a second fluid resistor, and a blood pressure measurement site A cuff body to be mounted; a cuff pressure detector connected to the cuff body by the second pipe; and the cuff. Connected to the body by the first pipe, pressurizing means for pressurizing the cuff body, a pressurizing control unit for controlling the pressurizing means, and connected by the cuff body and the first pipe, A decompression control unit that decompresses the main body, a pulse wave detection unit that is electrically connected to the cuff pressure detection unit, converts a pulse wave into a detection pulse wave signal, and detects a pulse wave superimposed on the detection pulse wave signal; A blood pressure detection unit that determines a blood pressure value based on an output from the pulse wave detection unit and a detection cuff pressure signal of the cuff pressure detection unit; and a blood pressure display unit that displays a blood pressure value of the blood pressure detection unit. A computer-readable storage medium storing a control program for the blood pressure measurement device, wherein the control program uses the program for compressing the artery via the pressurization control unit, and the pressure detection unit. Pro to convert waves into detected pulse wave signals A program for depressurizing the cuff assembly by the ram, the depressurization control unit, a program for detecting a pulse wave superimposed on the detected pulse wave signal by the pulse wave detection unit, and the blood pressure detection unit. A program for determining a blood pressure value based on an output of the wave detection unit and a detected cuff pressure signal of the cuff pressure detection unit, and a program for displaying the blood pressure value from the blood pressure detection unit in the blood pressure display unit. It is characterized by that.

  Further features of the present invention will become apparent from the best mode for carrying out the present invention and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the reduction | decrease change of the compression pressure which arises toward the cuff end from the cuff center part of the compression pressure which is the fault of the Rivaroch cuff used for a cuff can be eliminated. Specifically, it is reinforced by the compression force of the sub-air bladder to which the same pressure as the cuff is applied, and at the timing of systolic blood pressure measurement, blood is prevented from flowing into the upstream part under the cuff, and the upstream of the cuff The volume change generated by the blood flowing in from the side toward the center of the air bag for ischemia is guarded by the sub air bag, and further attenuated appropriately by the fluid resistor connected to the sub air bag, It is possible to prevent the change in volume from being transmitted to the bag and to accurately detect only the pulse wave change due to the change in volume downstream of the cuff based on the resumption of blood flow with an improved S / N ratio.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a blood pressure measurement device according to an embodiment of the present invention.

  According to the embodiment of the figure, the cuff body 100 includes a cuff cloth 5 serving as a cuff body mounted on an arm serving as a blood pressure measurement site, an air bag 1 for ischemia that compresses the artery K of the blood pressure measurement site, A sub-air bag 3 disposed closer to the heart H than a substantially central portion below the air bag 1 for ischemia, and a pulse for detecting a pulse wave while being disposed at a substantially central portion below the air bag 1 for ischemia. A wave detection air bag 2 is provided.

  The hemostasis air bag 1 and the sub air bag 3 are connected to the first pipe 6 via branch portions 6a, 6b, 6c, and 6d, and a fluid resistance portion such as an orifice is provided between the branch portions 6b and 6d. A first fluid resistor 21 is connected as shown.

  On the other hand, the second fluid resistor 11 is connected to the second pipe 7 as illustrated. Further, the cuff pressure detector 13 is branched from the branch portion 7a of the second pipe 7 and connected thereto, while the second fluid resistor 11 is branched from the first pipe 6k to the pressurized fluid inlet side. 11 a is connected, and the reduced pressure fluid inlet side 11 b is connected to the branch portion 7 a of the second pipe 7 as shown in the figure. Here, the fluid resistance of the second fluid resistor 11 is appropriately set, but a fluid resistance unit such as an orifice having the same fluid resistance as the first fluid resistor 21 may be provided.

  The sub-air bag 3 is disposed closer to the heart of the cuff assembly 100 on the side in contact with the living body so that the sub-air bag 3 can be positioned between the blood pressure measurement site and the central site on the upstream side of the air bag 1 for ischemia. The sub-air bag 3 is not limited to the size shown in the drawing, and a part of the sub-air bag 3 may protrude from the ischemic air bag 1 on the left side in the drawing, and is further arranged on the heart side from the central portion of the ischemic cuff. If it is, it may have the same vertical length as the air bag 1 for ischemia.

  The blood pressure measurement device illustrated in FIG. 1 is configured separately from a device main body 10 and a cuff main body 100 (hereinafter referred to as a cuff) attached to a blood pressure measurement site.

  As shown in the figure, the cuff body 100 is mounted so that the upstream portion of the cuff is on the left ventricle side where the blood flow of the artery at the blood pressure measurement site flows. This cuff body 100 is provided with a cuff cloth 5 that wraps the entire cuff with a blood bag 1 for ischemia, an air bag 2 for detecting a pulse wave, and a sub air bag 3 connected via the first fluid resistor 11. It has a male and female hook-and-loop fastener (not shown) for fixing the cuff body 100 after it is wound around the blood pressure measurement unit. Further, the cuff body 100 may be provided with a backing member made of a packing material between the cuff cloth 5 and the cuff on the side opposite to the surface of the air bag 1 that contacts the living body, as will be described later.

  On the other hand, the third pipe 60 may be further connected from the branch portions 6 b and 6 d of the pipe 6, and the check valve 22 connected in parallel with the first fluid resistor 11 is connected to the third pipe 60. By connecting, when the cuff body 100 is pressurized, the check valve 22 can bypass the first fluid resistor 11 to pressurize the sub air bag 3 within a short time. That is, in FIG. 1, the check valve 22 is connected in parallel with the first fluid resistor 21 so that the fluid inlet side 22a is connected to the first pipe 6 and the fluid outlet side 22b is connected to the sub air bag 3. By doing so, the pressurization time can be shortened.

  By enabling the pressurization in this way, for example, when the size of the arm of the blood pressure measurement person increases and the volume of the sub-cuff has to be set large, if the pressurization is performed via the first fluid resistor 11, the sub-cuff The phenomenon that the air bag 3 is not sufficiently inflated can be prevented.

  The cuff main body 100 and the main body 10 are detachably connected by a connector 38, but may be integrated piping.

  In order to eliminate the pulse wave detected by the sub air bag 3, a first fluid resistor 21 is provided between the ischemic air bag 1 and the sub air bag 3, and a second wave resistor 2 is provided in the pulse wave detecting air bag 2. The fluid resistors 11 are branched and connected as described above. It is confirmed that the S / N ratio at the time of measurement of the systolic blood pressure is improved by setting the capacity B of the sub-air bag 3 to a maximum (A / 2) ml, where the capacity of the air bag 1 for ischemia is Aml. It was.

  On the other hand, a pressurization control unit 19 that controls the air pressure from the pump 18 and a decompression control unit 20 that performs decompression exhaust control are connected to the first pipe 6 of the cuff body 100 as shown in the figure.

  The pipe 7 is connected to a cuff pressure detection unit 13 including a pressure sensor. From the output of the cuff pressure detection unit 13, a pulse wave detection unit 14 that detects a pulse wave superimposed on the output is connected. The blood pressure value is determined by the blood pressure detecting unit 15 based on the detected cuff pressure signal from the cuff pressure detecting unit 13 and the detected pulse wave signal from the pulse wave detecting unit 14, and the determined blood pressure value is displayed on the liquid crystal display. The blood pressure display unit 16 provided with a device or the like is configured to display.

  Further, the main body 10 includes a power source unit 17 such as a battery. The main unit 10 controls the above-described pump and each control unit, and controls a CPU including a ROM, a RAM, and the like that store various control programs readable by a computer. Power is supplied.

  Here, both or one of the fluid resistor 11 and the check valve 21 is disposed in the main body 10 and connected to the sub air bag 3 via a separate pipe, thereby reducing the size and weight of the cuff main body 100. You may make it plan. Each of the detection units 13, 14, 15 and the display unit 16 and the control units 19 and 20 are built in a CPU 70 (not shown) so that a predetermined program can be executed.

  2A is a cross-sectional view after the cuff body 100 is broken in the width direction and attached to the measurement site. FIG. 2B is an enlarged piping diagram for explaining the operation.

  In FIG. 2A, a first backing member 30 including a packing material is disposed between the ischemic air bag 1 and the sub air bag 3 in order to enhance the compression characteristics of the sub air bag 3. Further, a third backing member 40 including a packing material is disposed between the ischemic air bag 1 and the cuff cloth 5.

  Further, a second backing member 25 including a packing material is disposed between the ischemic air bag 1 and the pulse wave detecting air bag 2.

  In FIG. 2 (a), the sub air bag 3 is reinforced with the same pressure as the ischemic cuff 1, and at the timing of the systolic blood pressure measurement, the blood K1 is prevented from flowing into the upstream portion under the ischemic cuff 1, The volume change generated by the blood K1 flowing from the upstream side of the ischemic cuff toward the central portion of the ischemic cuff is guarded by the sub air bag 3, and the first fluid resistor 21 connected to the sub air bag 3 is further protected. Since the volume change can be prevented from being transmitted to the pulse wave detection air bag 2 by appropriately attenuating the air flow, the volume change of the pulse wave detection air bag 2 on the downstream side under the blood cuff 1 based on the resumption of blood flow. Only the pulse wave change due to can be detected with high accuracy by improving the S / N ratio.

  The cuff body 100 configured as described above can be used for various blood pressure measurement devices. For example, according to the blood pressure measurement device shown in FIG. 1, the stored control program is read by a computer, and the blood pressure measurement routine of FIG. It can operate | move like the flowchart of this.

  First, when the blood pressure apparatus is activated, pressurization is started by the pressurization control unit in step S1, and pressurization is performed in the direction of the arrow shown by the broken line in FIG. 2B, and the process proceeds to step S2. In this step S2, whether or not the pressure of the air bag for ischemia 1 has reached the set pressure is checked by a signal from the cuff pressure detection unit with a set pressure equal to or higher than 20-30 mmHg higher than the expected systolic blood pressure. Run until When the pressure of the cuff 1 for ischemia reaches the set pressure, the pressurization control unit stops pressurization in step S3. Here, when an electromagnetic valve is used as the check valve 22, the opening operation is performed in step S1, and the closing operation synchronized with the stop operation is performed in step S3.

  Subsequently, the process proceeds to step S4, and the pressure reduction control unit uses the signal from the cuff pressure detection unit to start the pressure reduction in the arrow direction indicated by the solid line in FIG. 2B so that the pressure reduction rate becomes 2 to 3 mmHg / sec. Is done. Subsequently, in step S5, the detection of the pulse wave is started from the signal from the cuff pressure detector. The pulse wave signal detected by the pulse wave detection unit is sent to a storage unit in the blood pressure detection unit, and the cuff pressure and the pulse wave amplitude are stored as a set. In step S6, the blood pressure detection unit detects the maximum value of the pulse wave amplitude, detects that the pulse wave amplitude continuously decreases, and detects the previous pulse wave that starts decreasing as the pulse wave maximum value. To do.

  Subsequently, the process proceeds to step S7, where the blood pressure detection unit detects a pulse wave that is equal to or less than a predetermined ratio of the pulse wave maximum value, for example, 60% or less, and sets the cuff pressure at that time to the diastolic blood pressure (minimum blood pressure value). Determine as. When the diastolic blood pressure is determined, the process proceeds to step S8, where rapid exhaust is performed by the decompression control unit. Then, in step S9, from the data in which the cuff pressure and the pulse wave amplitude recorded in the blood pressure detection unit are a set, the pulse wave amplitude is first abruptly greater than a predetermined value, for example, 50% or more suddenly after starting decompression. By detecting a change that increases, the pressure value of the pulse wave whose amplitude suddenly increases is determined as the systolic blood pressure. When determined in this way, in step S10, the systolic blood pressure value and the diastolic blood pressure value are displayed on the blood pressure display unit, and the series of blood pressure measurement operations is terminated.

  FIG. 4 shows the pulse wave amplitude and cuff pressure stored in the blood pressure determination unit in time series. (A) shows the detected pulse wave amplitude change when the sub air bag is not used, and (b) shows the detected pulse wave amplitude change when the sub air bag of the present invention is used.

  As shown in the figure, compared with the waveform of FIG. 4A, the waveform of FIG. 4B has a clear pulse wave amplitude change at the systolic blood pressure detection timing.

  As described above, even when the cuff pressure is higher than the systolic blood pressure, the blood flow that enters the lower cuff upstream of the ischemic cuff can be blocked by the sub-air bag. Detection was possible with a good S / N ratio, and the determination accuracy of the systolic blood pressure value could be improved.

It is a block diagram which shows the blood pressure measuring device of one Embodiment of this invention. (A) is sectional drawing of the cuff main body 100 of FIG. 1, (b) is an enlarged piping figure. 2 is an operation explanatory flowchart of the blood pressure measurement device in FIG. 1. (A) is a detected pulse wave amplitude change when the sub air bag is not used, and (b) is a pulse wave stored in the blood pressure determining unit for the detected pulse wave amplitude change when the sub air bag of the present invention is used. It is the chart which displayed amplitude and cuff pressure in time series.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air bag for ischemia 2 Air bag for pulse wave detection 3 Sub air bag 5 Cuff cloth 6 1st piping 7 2nd piping 11 2nd fluid resistor 21 1st fluid resistor 22 Check valve 10 Main body 100 Cuff main body

Claims (6)

An air bag for ischemia that compresses the artery of the blood pressure measurement site;
A sub-air bag disposed on the heart side from the substantially central part of the air bag for ischemia between the air bag for ischemia and a living body when mounted on a blood pressure measurement site;
And air bag for detecting pulse waves that is arranged at a substantially central portion of the air bag the ischemia in between the ischemia air bag and the living when worn on a blood pressure measurement site,
A first fluid resistor connected between the hemostasis bladder and the sub-air bladder;
In parallel with the first fluid resistor, a check valve whose input side is connected to the air bag side for ischemia and whose output side is connected to the sub air bag side;
A first pipe connected to the air bag for ischemia;
A second pipe connected to the pulse wave detection air bag via a second fluid resistor;
A cuff body attached to the blood pressure measurement site;
A cuff pressure detector connected by the cuff body and the second pipe;
A pressurizing means connected to the cuff body by the first pipe and pressurizing the cuff body;
A pressurizing control unit for controlling the pressurizing means;
A decompression control unit connected to the cuff body by the first pipe and decompressing the cuff body;
A pulse wave detection unit that is electrically connected to the cuff pressure detection unit, converts a pulse wave into a detection pulse wave signal, and detects a pulse wave superimposed on the detection pulse wave signal;
A blood pressure detector that determines a blood pressure value based on an output from the pulse wave detector and a detected cuff pressure signal of the cuff pressure detector;
A main body including a blood pressure display unit for displaying a blood pressure value of the blood pressure detection unit;
A blood pressure measurement apparatus comprising:   A first backing member including a packing material between the ischemic air bag and the sub-air bag, and a second backing member including a packing material between the ischemic air bag and the pulse wave detecting air bag. The blood pressure measurement device according to claim 1, wherein:   The blood pressure measurement device according to claim 1 or 2, wherein a third backing member including a packing material is disposed between the air bag for ischemia and the cuff body.   The blood pressure measuring device according to any one of claims 1 to 3, wherein the first fluid resistor and the second fluid resistor have substantially equal fluid resistance. An air bag for ischemia that compresses the artery of the blood pressure measurement site;
A sub-air bag disposed on the heart side from the substantially central part of the air bag for ischemia between the air bag for ischemia and a living body when mounted on a blood pressure measurement site;
And air bag for detecting pulse waves that is arranged at a substantially central portion of the air bag the ischemia in between the ischemia air bag and the living when worn on a blood pressure measurement site,
A first fluid resistor connected between the hemostasis bladder and the sub-air bladder;
In parallel with the first fluid resistor, a check valve whose input side is connected to the air bag side for ischemia and whose output side is connected to the sub air bag side;
A first pipe connected to the air bag for ischemia;
A second pipe connected to the pulse wave detection air bag via a second fluid resistor;
A cuff body attached to the blood pressure measurement site;
A cuff pressure detector connected by the cuff body and the second pipe;
A pressurizing means connected to the cuff body by the first pipe and pressurizing the cuff body;
A pressurizing control unit for controlling the pressurizing means;
A decompression control unit connected to the cuff body by the first pipe and decompressing the cuff body;
A pulse wave detection unit that is electrically connected to the cuff pressure detection unit, converts a pulse wave into a detection pulse wave signal, and detects a pulse wave superimposed on the detection pulse wave signal;
A blood pressure detector that determines a blood pressure value based on an output from the pulse wave detector and a detected cuff pressure signal of the cuff pressure detector;
A blood pressure display unit for displaying a blood pressure value of the blood pressure detection unit;
A blood pressure measurement device comprising:
Compressing the artery via the pressure control unit;
Converting the pulse wave into a detected pulse wave signal by the pressure detector;
Depressurizing the cuff assembly via the depressurization controller;
A step of detecting a pulse wave superimposed on the detected pulse wave signal in the pulse wave detection unit;
In the blood pressure detection unit, determining a blood pressure value based on an output of the pulse wave detection unit and a detection cuff pressure signal of the cuff pressure detection unit;
In the blood pressure display unit, displaying the blood pressure value from the blood pressure detection unit;
A measuring method characterized by comprising: An air bag for ischemia that compresses the artery of the blood pressure measurement site;
A sub-air bag disposed on the heart side from the substantially central part of the air bag for ischemia between the air bag for ischemia and a living body when mounted on a blood pressure measurement site;
And air bag for detecting pulse waves that is arranged at a substantially central portion of the air bag the ischemia in between the ischemia air bag and the living when worn on a blood pressure measurement site,
A first fluid resistor connected between the hemostasis bladder and the sub-air bladder;
In parallel with the first fluid resistor, a check valve whose input side is connected to the air bag side for ischemia and whose output side is connected to the sub air bag side;
A first pipe connected to the air bag for ischemia;
A second pipe connected to the pulse wave detection air bag via a second fluid resistor;
A cuff body attached to the blood pressure measurement site;
A cuff pressure detector connected by the cuff body and the second pipe;
A pressurizing means connected to the cuff body by the first pipe and pressurizing the cuff body;
A pressurizing control unit for controlling the pressurizing means;
A decompression control unit connected to the cuff body by the first pipe and decompressing the cuff body;
A pulse wave detection unit that is electrically connected to the cuff pressure detection unit, converts a pulse wave into a detection pulse wave signal, and detects a pulse wave superimposed on the detection pulse wave signal;
A blood pressure detector that determines a blood pressure value based on an output from the pulse wave detector and a detected cuff pressure signal of the cuff pressure detector;
A blood pressure display unit for displaying a blood pressure value of the blood pressure detection unit;
A computer-readable storage medium storing a control program for a blood pressure measurement device comprising:
The control program is
A program for compressing the artery via the pressurization control unit;
A program for converting the pulse wave into a detected pulse wave signal by the pressure detection unit;
A program for decompressing the cuff assembly by the decompression control unit;
A program for detecting a pulse wave superimposed on the detected pulse wave signal in the pulse wave detection unit;
In the blood pressure detection unit, a program for determining a blood pressure value based on an output of the pulse wave detection unit and a detection cuff pressure signal of the cuff pressure detection unit;
In the blood pressure display unit, a program for displaying a blood pressure value from the blood pressure detection unit;
A storage medium comprising:

Images