JPH06292660A - Oscillometric type hemopiezometer - Google Patents

Abstract

PURPOSE:To provide an oscillometric type hemopiezometer with which brain wave shapes for brain wave diagnosis are easily and inexpensively obtainable without enforcing burden on a living body and without preparing the brain wave detector to be exclusively used. CONSTITUTION:While the pressure of a cuff 10 is kept by a cuff pressure holding means 52 at the predetermined pressure value Phold lower than the mean blood pressure value Pmean determined by a blood pressure value determining means 50, the state of the brain waves of this time is stored by a brain wave shape memory means 54 and the shapes of the brain waves stored for the purpose of the brain wave diagnosis are displayed on a display device 38 by a brain wave shape display means 56. The shapes of the brain waves stored in a brain wave shape memory region 62 are analyzed by a brain wave analyzing means 58 in order to diagnose the brain waves. Then, the brain wave shapes for the brain wave diagnosis are easily and inexpensively obtd. without forcing the burden on the living body and without preparing the brain wave detector to be exclusively used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillometric blood pressure measuring device which enables pulse wave diagnosis.

[0002]

2. Description of the Related Art The shape of a pulse wave generated from an artery of a living body contains various information indicating the circulation dynamics of blood, and the shape of the pulse wave is analyzed to diagnose the state of the circulatory system of the living body. A pulse wave diagnostic device that does this has been proposed.

[0003]

Generally, in the above-mentioned conventional pulse wave diagnostic apparatus, the pulse wave generated from the artery is directly detected by a pressure sensor through a catheter inserted into the blood vessel, or disclosed in Japanese Patent Laid-Open No. It may be indirectly detected by a pressure sensor that is pressed against an artery just under the skin as described in Japanese Patent No. 136608. However, in such a conventional device, in order to detect directly, not only a specialized technique of catheter insertion by a doctor is required, but also a living body is burdened. Further, in the case of indirect detection, a dedicated pulse wave detection device is required, the device becomes complicated and expensive, and complicated work such as mounting the pulse wave detection device is required.

The present invention has been made in view of the above circumstances, and an object thereof is to diagnose a pulse wave without imposing a burden on a living body and without preparing a dedicated pulse wave detecting device. An object of the present invention is to provide an oscillometric blood pressure measuring device that can easily and inexpensively obtain a pulse wave shape for use in blood.

[0005]

The first aspect of the present invention for achieving the above object is to change the pressure of a cuff wound around a part of a living body to change the heartbeat of the cuff. Detecting a pulse wave generated in synchronization, an oscillometric blood pressure measuring device for determining the blood pressure value of the living body based on the change in the size of the pulse wave, (a) the pressure of the cuff of the living body Cuff pulse wave detection means for detecting the cuff pulse wave generated in the cuff when it is a predetermined value lower than the average blood pressure value, and (b) the pulse wave based on the signal from the cuff pulse wave detection means. A pulse wave shape storage means for storing the shape; and (c) a pulse wave shape display means for displaying the shape of the pulse wave stored by the pulse wave shape storage means for pulse wave diagnosis on a display. It is in.

[0006]

With this configuration, in the oscillometric blood pressure measuring device, the cuff pulse wave generated when the cuff pressure is a predetermined value lower than the average blood pressure value is detected by the cuff pulse wave detecting means. At the same time, the shape of the pulse wave is stored by the pulse wave shape storage means based on the signal from the cuff pulse wave detection means, and the pulse wave shape stored by the pulse wave shape storage means for pulse wave diagnosis It is displayed on the display by the wave shape display means. When the cuff pressure is set to a predetermined value that is lower than the average blood pressure, the pulse wave that is the pressure oscillation in the cuff has a waveform that is substantially the same as the pulse wave that is the pressure fluctuation in the artery. The pulse wave shape display means displays the same pulse wave as that in the artery on the display.

[0007]

Therefore, according to the oscillometric blood pressure measuring apparatus of the present invention, the pulse wave for pulse wave diagnosis is not imposed on the living body and the dedicated pulse wave detecting apparatus is not prepared. The shape can be obtained easily and inexpensively.

[0008]

A second aspect of the present invention for attaining the above-mentioned object is to provide a process for changing the pressure of a cuff wound around a part of a living body. Detects the pulse wave generated in the cuff in synchronization with the heartbeat,
An oscillometric blood pressure measuring device for determining a blood pressure value of a living body based on a change in the size of the pulse wave, (a) a predetermined value in which the pressure of the cuff is lower than the average blood pressure value of the living body. Cuff pulse wave detection means for detecting the cuff pulse wave generated in the cuff at a time, (b) pulse wave shape storage means for storing the shape of the pulse wave based on the signal from the cuff pulse wave detection means, (c) pulse wave analysis means for analyzing the shape of the pulse wave stored by the pulse wave shape storage means for pulse wave diagnosis.

[0009]

With this configuration, in the oscillometric blood pressure measuring device, the cuff pulse wave generated when the cuff pressure is a predetermined value lower than the average blood pressure value is detected by the cuff pulse wave detecting means. At the same time, the shape of the pulse wave is stored by the pulse wave shape storage means based on the signal from the cuff pulse wave detection means, and the pulse wave shape stored by the pulse wave shape storage means for pulse wave diagnosis It is analyzed by the wave analysis means.

[0010]

Therefore, even in the oscillometric blood pressure measuring apparatus of the present invention, the burden on the living body is not imposed and the dedicated pulse wave detecting apparatus is not prepared.
The pulse wave shape for pulse wave diagnosis can be obtained easily and inexpensively.

Preferably, the blood pressure value determining means for determining the average blood pressure value of the living body, and the cuff for holding the cuff at a predetermined value lower than the average blood pressure value determined by the blood pressure value determining means. Pressure holding means is further provided, and the cuff pulse wave detecting means detects the pulse wave from the pressure vibration of the cuff held at a predetermined value lower than the average blood pressure value. In such a case, as compared with the case where the cuff pulse wave is detected during the pressure drop of the cuff, the process of removing the distortion of the cuff pulse wave accompanying the pressure drop of the cuff becomes unnecessary.

Also, preferably, the blood pressure value determining means is
The average blood pressure value of the living body is determined during the pressure increase process of the cuff, and the cuff pressure holding means is configured to hold the cuff at a predetermined value lower than the average blood pressure value during the pressure decrease process of the cuff. In such a case, there is an advantage that blood pressure measurement and pulse wave storage can be simultaneously performed in one cycle of pressure increase and pressure decrease of the cuff.

Also, preferably, the blood pressure value determining means is
The pressure of the cuff when the maximum amplitude of the sequentially generated cuff pulse wave is determined is determined as the average blood pressure value. Further, preferably, the blood pressure value determining means determines, as the average blood pressure value, the pressure of the cuff when the mutual correlation coefficient of adjacent pulse waves among the sequentially generated cuff pulse waves becomes the minimum value. It is a thing. In this case, there is an advantage that the average blood pressure value can be determined without temporarily lowering the pressure of the cuff.

Further, preferably, the oscillometric blood pressure measuring apparatus includes a pressure pulse wave sensor for detecting a radial pulse wave generated in a radial artery of the living body, and the radial pulse wave and the cuff pulse wave. Based on the transfer function between the pulse wave in the aorta and the cuff pulse wave, and a pulse wave calculation for calculating the pulse wave in the aorta from the corrected transfer function based on the cuff pulse wave. Means, and the pulse wave shape storage means is configured to store the pulse wave calculated by the pulse wave calculation means. By doing so, the pulse wave shape in the aorta can be obtained, so that more accurate pulse wave diagnosis can be performed based on the pulse wave shape.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An oscillometric blood pressure measuring apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a cuff 10 wound around an upper arm of a living body is pressed into a bag shape by an elastic film such as a rubber sheet or a vinyl sheet. It is connected to the pump 14, the exhaust control valve 16 and the air pipe 18.

The pressure sensor 12 includes, for example, a semiconductor pressure detecting element, detects the pressure in the cuff 10, and outputs a pressure signal SP representing the pressure to the low pass filter 20, the first band pass filter 22, and the first band pass filter 22. It is supplied to the 2-band pass filter 23. The low-pass filter 20 discriminates the DC component contained in the pressure signal SP to take out static pressure, and outputs it as the cuff pressure signal SK to the A / D converter 24. The first band-pass filter 22 is for extracting a pulse wave component by discriminating a frequency component of, for example, 1 to 10 Hz included in the pressure signal SP.
It is output to the A / D converter 24 as M1. In the cuff 10 wrapped around the upper arm of the living body, pressure fluctuations are generated in synchronization with the heartbeat based on the pulsation of the artery. The second band-pass filter 23 discriminates the frequency component of 0.5 to 20 Hz included in the pressure signal SP to extract the pulse wave component, and outputs it as the pulse wave signal SM2 to the A / D converter 24. . The first bandpass filter 22 has a narrow frequency characteristic aimed at extracting the pulse wave amplitude without the influence of noise such as motion artifact noise, whereas the second bandpass filter 23 generates in the artery. It has a relatively wide frequency characteristic for the purpose of accurately extracting from the cuff 10 a pulse wave having the same shape as the pressure pulse wave. The A / D converter 24
Includes a multiplexer that time-divisions the three types of input signals, and has a function of A / D converting the three types of input signals in parallel.

The arithmetic and control unit 26 includes a CPU 28 and a RAM.
The CPU 28 is a so-called microcomputer including the ROM 30, the output interface 34, and the display interface 36. The CPU 28 stores the signal input from the A / D converter 24 in the ROM 32 in advance while using the temporary storage function of the RAM 30. Process according to the program
The air pump 14 and the exhaust control valve 16 are drive-controlled via the output interface 34, and the display 38 is drive-controlled via the display interface 36.
The display 38 includes an image display plate capable of displaying numerical values and waveforms by a large number of light emitting elements, and a printer capable of displaying numerical values and waveforms on the paper surface with ink.

The mode changeover switch 40 is operated to switch between the blood pressure measurement mode and the pulse wave diagnosis mode, and selectively supplies a signal instructing the blood pressure measurement mode or the pulse wave diagnosis mode to the CPU 28. Further, the start / stop switch 42 supplies the CPU 28 with a signal for alternately instructing start and stop for each pressing operation.

FIG. 2 is a functional block diagram for explaining a main part of control operation of the arithmetic and control unit 26. In the figure, the pressure sensor 12 detects a pulse wave generated in the cuff 10 in synchronization with the heartbeat in the process of changing the pressure of the cuff 10 wrapped around a part of the living body. The blood pressure value determining means 50 determines the average blood pressure value of the living body. The cuff pressure holding means 52 holds the pressure of the cuff 10 at a predetermined value lower than the average blood pressure value of the living body. The pulse wave shape storage unit 54 stores the wave shape in a state where the pressure in the cuff 10 is set to a predetermined value lower than the average blood pressure value of the living body by the cuff pressure holding unit 52. The pulse wave shape display means 56 causes the display 38 to display the shape of the pulse wave stored by the pulse wave shape storage means 54 for pulse wave diagnosis. Also, the pulse wave analysis means 5
Reference numeral 8 analyzes the pulse wave shape stored by the pulse wave shape storage means 54 for pulse wave diagnosis.

FIG. 3 is a flow chart for explaining a main part of the control operation of the arithmetic and control unit 26. In step S1 of the figure, it is determined based on a signal from the start / stop switch 42 whether or not the start of the apparatus has been operated. If the determination in step S1 is negative, the process is put on standby, but if the determination is affirmative, the air pump 14 is driven in step S2 to rapidly increase the pressure of the cuff 10.

In the following step S3, it is determined whether or not the cuff pressure has reached a preset target pressure P _t , for example, 180 mmHg. If the determination in step S3 is negative, steps S2 and subsequent steps are repeatedly executed.
In the affirmative, in step S4, the opening degree of the exhaust control valve 16 is controlled to start the gradual exhaust of the cuff 10, and the cuff pressure becomes a speed suitable for blood pressure measurement, for example, 2 to 3 mmHg / sec. The pressure is gradually lowered. And
In step S5, it is determined based on the pulse wave signal SM1 whether one pulse wave is input. This step S5
If the determination is negative, steps S4 and thereafter are repeatedly executed.

However, if the determination in step S5 is affirmative, in step S6 a blood pressure value determination routine is executed according to a predetermined blood pressure value determination algorithm, and then in step S7 it is determined whether the blood pressure value has been determined. Is determined. In the step of lowering the pressure of the cuff 10, the pulse wave amplitude based on the pulse wave signal SM1 has the property of initially increasing in sequence but decreasing thereafter. In the blood pressure value determination algorithm, for example, the amplitude of the pulse wave rapidly increases. The cuff pressure value at the time of performing is the maximum blood pressure value P _sys , the cuff pressure value when the amplitude of the pulse wave is maximum is the mean blood pressure value P _mean , and the cuff pressure value when the amplitude of the pulse wave is rapidly decreasing is the minimum. It is determined as the blood pressure value P _dia .

If the determination in step S7 is negative, steps S4 and thereafter are repeatedly executed, but if the determination is positive, the blood pressure values P _{sy s} , P _mean , and P _dia are RAM 30 in step S8. Are stored in the blood pressure value storage area 60 and displayed numerically on the display 38, the exhaust control valve 16 is opened, the cuff 10 is rapidly exhausted, and the compression by the cuff 10 is released. Then, in step S9, it is determined based on a signal from the mode changeover switch 40 whether or not the pulse wave diagnosis mode is set. If the determination in step S9 is negative, that is, in the blood pressure measurement mode, this routine is ended and step S1 is executed again.

However, if the determination in step S9 is affirmative, that is, in the pulse wave diagnostic mode, the exhaust control valve 16 is closed and the air pump 14 is driven at the same time in step S10, so that The cuff 10 is again boosted at a speed similar to the boosting speed of. Then, in the subsequent step S11, the cuff pressure is equal to or lower than the average blood pressure value P _{mean and is} a predetermined constant pressure value P
_hold , for example, it is determined whether or not the intermediate value between the _mean blood pressure value P _mean and the lowest blood pressure value P _dia , more preferably, the pressure value one pulse wave before the time when the lowest blood pressure value P _dia was determined. . If the determination in step S11 is negative, steps S10 and below are repeatedly executed, but if the determination is positive, step S12 is executed.

In step S12, the exhaust control valve 16
By immediately stopping the exhaust of the cuff 10
The pressure of the cuff 10 is the predetermined constant pressure value.
P_{ho ld}The pressure value of the cuff 10 is held at
_holdAt least one pulse wave shape is the signal SM
Pulse waveform shape memory of RAM 30 read based on 2
After being stored in the area 62, the cuff is controlled by the exhaust control valve 16.
10 is rapidly exhausted. In the following step S13, the memory is
Calibration to obtain the absolute value of the measured pulse wave shape
Is performed. That is, the value of the upper peak of the pulse wave shape is
Maximum blood pressure P _sys, The lower peak value of the pulse wave shape
Low blood pressure P_diaBy setting the
The instantaneous value of pressure is shown. Then step
In step S14, it is stored in the pulse wave shape storage area 62.
The shape of the pulse wave is displayed on the display unit 3 for pulse wave diagnosis by an expert.
8 is displayed on the image display plate and the printing paper surface.

In step S15, the calibrated pulse wave shape stored in the pulse wave shape storage area 62 is analyzed to quantitatively extract the characteristic portion of the pulse wave shape and display it on the display 38. After being displayed, this routine is ended. In the analysis of the pulse wave shape, the maximum value (dp / dt) _max of the differential value (slope) in the rising region of the pulse wave is obtained, for example. This (dp / d
t) _max is proportional to myocardial strength and is a value related to cardiac output.

As described above, according to this embodiment, the cuff 1 is processed by step S11 corresponding to the cuff pressure holding means 52.
The pressure of 0 corresponds to the blood pressure value determining means 50 in step S6.
In the state where the pressure value P _hold is set below the average blood pressure value P _mean determined by
The pulse wave shape storage area 62 corresponding to is stored the pulse wave shape at that time, and the stored pulse wave shape for pulse wave diagnosis is displayed on the display 38 by step S14 corresponding to the pulse wave shape display means 56. Is displayed. Thereby, the medical professional can execute the pulse wave diagnosis based on the shape of the pulse wave displayed on the display 38.

Further, according to the present embodiment, the shape of the pulse wave stored in the pulse wave shape storage area 62 for pulse wave diagnosis is analyzed in step S15 corresponding to the pulse wave analysis means 58. As a result, based on the value of (dp / dt) _max showing the characteristics of the waveform obtained from the result of the pulse wave analysis,
The state of the circulatory organ can be easily grasped.

Therefore, according to the oscillometric blood pressure measuring apparatus of the present embodiment, the pulse wave shape for pulse wave diagnosis can be easily obtained without imposing a burden on the living body and without preparing a dedicated pulse wave detecting apparatus. And it can be obtained at low cost.

Further, according to this embodiment, the cuff 1 is compared with the case where the pulse wave is detected during the continuous pressure drop of the cuff 10.
There is an advantage that the process for removing the distortion of the pulse wave due to the pressure drop of 0 is not necessary.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment will be designated by the same reference numerals and the description thereof will be omitted.

In the embodiment shown in the flow chart of FIG.
Cuff 10 in which steps S2 and S3 are repeatedly executed
In the step-up process, when the maximum amplitude of the pulse wave of the booster process is determined in step S16, with the pressure of the cuff 10 at that time is stored as the mean blood pressure P _mean in step S17, the mean blood pressure P _mean The following pressure value P _hold , for example, a pressure lower than the _mean blood pressure value P _mean by about 20 mmHg is determined. Then, in the gradual depressurization process of the cuff 10 in which steps S4 to S7 are repeatedly executed,
The pressure of the cuff 10 is changed to the pressure value P in step S18.
_When it is determined that the pressure is on _hold , the exhaust of the cuff 10 is stopped at step S19, the pressure of the cuff 10 is temporarily held at the pressure value P _hold, and the pulse wave shape is stored in the pulse wave shape storage area 62. After that, the gradual pressure reduction of the cuff 10 is continued. FIG. 5 shows a time chart showing the pressure change of the cuff 10. According to the present embodiment, there is an advantage that the blood pressure value and the pulse wave shape are stored at the same time by the pressure increase and decrease of the cuff 10 once.

For example, in step S6 of FIG. 3 and step S16 of FIG. 4, the average blood pressure value P _mean is determined by determining the maximum amplitude of the pulse wave generated in the cuff 10, but the pressure of the cuff 10 is determined. Correlation coefficient F (τ) between pulse waves that are adjacent to each other among pulse waves that are sequentially generated with changes
May be calculated according to, for example, Equation 1, and it may be determined that the maximum value F _max (τ) of the correlation coefficient has decreased by a predetermined value or more, and the pressure of the cuff 10 at that time may be determined as the average blood pressure. FIG. 6 shows the correlation coefficient F (τ) between the pressure of the cuff 10 and the pulse wave. Since the shape of the pulse wave generated in the cuff 10 has different properties with the average blood pressure value P _mean as a boundary, the pulse waves obtained when the pressure of the cuff 10 is higher or lower than the average blood pressure value P _mean . Each correlation coefficient has a high value, but the correlation coefficient between the pulse wave when it is higher than the _mean blood pressure value P _mean and the pulse wave when it is lower than the _mean blood pressure value P _mean is low.

[0035]

[Formula 1] F (τ) = ∫f (t) · f (t−τ) dt

FIG. 7 is a diagram showing the configuration of another embodiment of the present invention, which is different from the device shown in FIG. 1 in order to detect the pressure pulse wave generated in the radial artery or the dorsalis pedis artery. Further provided are a pressure pulse wave sensor 70 that is worn on the wrist or foot while being pressed against the artery, and a third band pass filter 72 that discriminates the pressure pulse wave component from the output signal thereof. The pulse wave stored in the pulse wave shape storage area 62 in step S12 or S19 of the above-described embodiment is the cuff pulse wave generated in the cuff 10. However, in this embodiment, the pulse wave of the aorta is calculated from the cuff pulse wave. The difference is that the pulse wave is estimated and displayed or analyzed. The operation of this embodiment shown in steps S20 to S23 of FIG. 8 is in addition to step S12 or S19 of the above-described embodiment.

In step S20 of FIG. 8, the shape of the pressure pulse wave from the pressure pulse wave sensor 70 is read, and in step S21, for example, the pressure pulse wave of the radial artery and the pressure pulse wave generated in the cuff 10 attached to the upper arm are generated. The difference from the cuff pulse wave is calculated. Then, step S2 corresponding to the transfer function correcting means.
In 2, the correction coefficients a and b in Equation 2 are determined based on the difference between the actual pressure pulse wave of the radial artery and the cuff pulse wave from the relationship stored in advance. In the T of Equation 2, the aortic pressure pulse wave M _d (t) from which blood is output from the left ventricle propagates to the cuff 10 wrapped around the upper arm, and the cuff pulse wave M is applied to the cuff 10.
transmission when generating the _k (t) function T [= M _k (t) /
M _d (t)], which is experimentally obtained in advance. The correction coefficients a and b are functions of the difference between the pressure pulse wave of the radial artery and the cuff pulse wave, and are extremely small values that change in relation to the actual state of the blood vessel.

[0038]

[Equation 2] M _d (t) = M _k (t) · 1 / (aT + b)

Subsequently, in step S23 corresponding to the pulse wave calculating means, based on the cuff pulse wave M _k (t) stored in the pulse wave shape storage area 62 in step S12 or S19 from the above equation 2, the aorta is calculated. Pressure pulse wave M
_d (t) is calculated and stored in the RAM 30. Then, the pressure pulse wave M _d (t) of the aorta, which has been calibrated as necessary, is displayed on the display device 38 in step S14 and analyzed in step S15. According to the present embodiment, since the pulse wave of the aorta is estimated by calculation, there is an advantage that the accuracy of pulse wave analysis can be further improved.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other modes.

For example, the blood pressure measuring device of the above-described embodiment is configured such that the blood pressure measurement is performed once each time the start / stop switch 42 is operated, or the subsequent storage and analysis of the pulse wave shape is executed. However, the blood pressure measurement or the subsequent pulse wave shape storage and analysis may be repeatedly executed at a predetermined cycle.
In this case, by storing the analysis result of the blood pressure value and the pulse wave shape for each measurement, for example, in addition to the diurnal fluctuation of the blood pressure and the pulse rate for 24 hours, the diurnal fluctuation of the analysis value of the pulse wave shape is also obtained. Can be obtained.

In the above embodiment, the mean blood pressure value (pressure value at the center of gravity of the pulse wave area) P _mean ^S obtained by integrating the cuff pulse wave after calibration or the pulse wave of the aorta and the above By comparing the _mean blood pressure value P _mean obtained by the oscillometric blood pressure measurement,
There may be the step of assessing the reliability of the oscillometric blood pressure measurement.

Further, in the above-described embodiment, step S15.
Although the shape analysis of the cuff pulse wave or the aortic pulse wave is performed by the above, the pulse wave analysis may be performed by an external analysis device connected to the blood pressure measurement device of FIG.

In addition, steps S12 and S of the above-described embodiment
In 19, the shape of the cuff pulse wave was read in a state where the pressure in the cuff 10 was held at a predetermined pressure value P _hold lower than the average blood pressure value P _mean , but it was related to the pressure drop in the cuff 10. By using a filter that removes components, the shape of the cuff pulse wave may be read in the process of continuously lowering the pressure of the cuff 10.

The pressure value _Phold is the minimum blood pressure value P.
_It may be lower than _dia . Even in this case,
An accurate pulse wave is obtained as compared with the case where the pressure value P _hold is set above the _mean blood pressure value P _mean .

The above description is merely one embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a functional block diagram illustrating a main part of a control function of an arithmetic control circuit 26 of FIG.

FIG. 3 is a flowchart illustrating a main part of a control operation of an arithmetic control circuit 26 of FIG.

FIG. 4 is a view corresponding to FIG. 3 of another embodiment of the present invention.

5 is a time chart showing pressure changes in the cuff of the embodiment of FIG.

FIG. 6 is a mean blood pressure value P _mean in another embodiment of the present invention.
It is a figure which shows the correlation coefficient at the time of determining.

FIG. 7 is a diagram corresponding to FIG. 1 in another embodiment of the present invention.

FIG. 8 is a flow chart illustrating an essential part of the operation of the embodiment of FIG.

[Explanation of symbols]

 10: Cuff 12: Pressure sensor 38: Display 54 Pulse wave shape storage means 56: Pulse wave shape display means 58: Pulse wave analysis means 70: Pressure pulse wave sensor

Claims (7)

[Claims] 1. A pulse wave generated in the cuff in synchronism with a heartbeat in the process of changing the pressure of the cuff wrapped around a part of a living body is detected, and the pulse wave is detected based on a change in the magnitude of the pulse wave. An oscillometric blood pressure measuring device for determining a blood pressure value of a living body, which detects a cuff pulse wave generated in the cuff when the pressure of the cuff is a predetermined value lower than the average blood pressure value of the living body. Cuff pulse wave detecting means, pulse wave shape storing means for storing the shape of the pulse wave based on the signal from the cuff pulse wave detecting means, and pulse stored by the pulse wave shape storing means for pulse wave diagnosis. An oscillometric blood pressure measurement device, comprising: a pulse wave shape display means for displaying a wave shape on a display. 2. A pulse wave generated in the cuff in synchronism with a heartbeat in the process of changing the pressure of the cuff wrapped around a part of a living body is detected, and the pulse wave is detected based on a change in the magnitude of the pulse wave. An oscillometric blood pressure measuring device for determining a blood pressure value of a living body, which detects a cuff pulse wave generated in the cuff when the pressure of the cuff is a predetermined value lower than the average blood pressure value of the living body. Cuff pulse wave detecting means, pulse wave shape storing means for storing the shape of the pulse wave based on the signal from the cuff pulse wave detecting means, and pulse stored by the pulse wave shape storing means for pulse wave diagnosis. An oscillometric blood pressure measuring device, comprising: a pulse wave analyzing unit that analyzes the shape of a wave. 3. A blood pressure value determining means for determining an average blood pressure value of the living body, and a cuff pressure holding means for holding the cuff at a predetermined value lower than the average blood pressure value determined by the blood pressure value determining means. 3. The oscillometric equation of claim 1 or 2, wherein the cuff pulse wave detecting means detects the pulse wave from the pressure oscillation of the cuff held at a predetermined value lower than the average blood pressure value. Blood pressure measurement device. 4. The blood pressure value determining means determines the average blood pressure value of the living body in the step of increasing the pressure of the cuff, and the cuff pressure holding means determines the average blood pressure value of the cuff in the step of decreasing the pressure of the cuff. The oscillometric blood pressure measuring device according to claim 3, which is held at a low predetermined value. 5. The oscillometric blood pressure measurement according to claim 3, wherein the blood pressure value determination means determines the pressure of the cuff when the maximum amplitude of the sequentially generated cuff pulse waves is determined as an average blood pressure value. apparatus. 6. The blood pressure value determining means determines, as the average blood pressure value, the pressure of the cuff when the mutual correlation coefficient of the adjacent pulse waves among the sequentially generated cuff pulse waves becomes the minimum value. The oscillometric blood pressure measurement device according to claim 3. 7. The oscillometric blood pressure measuring device includes a pressure pulse wave sensor for detecting a radial pulse wave generated in a radial artery of the living body, and an aorta based on the radial pulse wave and the cuff pulse wave. The transfer function between the pulse wave and the cuff pulse wave in the above, and pulse wave calculating means for calculating the pulse wave in the aorta from the corrected transfer function based on the cuff pulse wave. 3. The oscillometric blood pressure measurement device according to claim 1, wherein the pulse wave shape storage means stores the pulse wave calculated by the pulse wave calculation means.