JPS60190933A - Display of blood pressure measuring state - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention is a method for evaluating the validity of a blood pressure value based on a correct GEE in a type of blood pressure measurement that determines a blood pressure value based on changes in cuff pressure and changes in pulse wave intensity. The present invention relates to a method of displaying the state of blood pressure measurement by clearly indicating the portion corresponding to the measured blood pressure value in a chart showing the relationship between cuff pressure changes and pulse wave intensity so as to obtain the results.

Conventional technology Gradually changes the internal pressure of a cuff wrapped around the upper arm of the human body, and generates pulse waves that change with changes in the pressure of the cuff, that is, vibrations that occur in synchronization with the pulse of the artery. An automatic 1 (11) pressure measuring device has been conventionally provided that detects the pulse wave, determines the systolic blood pressure value and the diastolic blood pressure value from changes in the strength of the pulse wave, and displays the values. The relationship between the strength of the pulse wave and the strength of the pulse wave is as shown in Figure 1. When the pressure value of the cuff gradually decreases and blood begins to flow into the compressed blood vessel, the pulse wave that occurs in synchronization with the pulse rate increases. The waves (vibrations) gradually become stronger, the cuff pressure value further decreases, the pressure on the blood vessels decreases, and the pulse wave also weakens.Then, the relationship between the cuff pressure and the strength of the pulse wave during this series of processes can be seen. By memorizing and calculating, the cuff pressure when the pulse wave becomes strong is set as the systolic blood pressure value, and the cuff pressure B when it suddenly becomes weak is set as the diastolic blood pressure value. was obtained by the so-called oscillometric method, which detects pulse waves as internal pressure vibrations in the cuff, but the
OKOF'F) Methods of detecting pulse waves by other means, such as the micro-bone method in which sound is detected with a microphone, or the ultrasound method in which ultrasound is reflected from the arterial blood vessel wall and its Doppler deviation is detected. is also known. However, in such automatic blood pressure measuring devices, if artifacts caused by the subject's body movements or noise from the electric scalpel do not represent a pulse wave, and the electrical signal No. 11 is mixed in, it may be difficult to determine when the pulse wave occurred. If they matched, there was a risk that the noise would be processed as a pulse wave and the systolic blood pressure or diastolic blood pressure values would be incorrectly determined, even though noise removal filters, etc. are installed. . However, for example, if the noise N shown by the dashed-dotted line in Figure 1 is processed as a pulse wave, the internal pressure of the cuff at the time the noise N is mixed will be determined as the systolic blood pressure value.) It is. Furthermore, it is extremely difficult to judge from the displayed blood pressure value whether or not the decision to proceed to such a signal processing stage is appropriate.

On the other hand, Japanese Patent Application Laid-Open No. 57-52, which the present applicant previously applied for,
According to the blood pressure measurement and display method described in Publication No. 439, the relationship between cuff pressure changes and pulse wave strength is displayed on a two-dimensional chart, and the relationship between the systolic blood pressure value and the diastolic blood pressure value of the chart is displayed. Since a predetermined mark is displayed at the position, by checking the chart and mark (6), it is possible to determine whether the measured blood pressure value was 1J15 F by Noyce or not. It is possible to accurately judge whether the blood pressure measurement status is correct or not. However, with this display method in which charts and marks are displayed separately, it is difficult to recognize when determining whether the blood pressure measurement is appropriate or not. There is a problem that the display device for displaying the image becomes complicated and large.

Purpose of the Invention The present invention has been made against the background of the above circumstances, and
The purpose of this is to provide a blood pressure measurement status display method that displays the relationship between cuff pressure changes and pulse wave intensity during blood pressure measurement, and the pulse wave measurement point corresponding to the blood pressure value determined from that relationship. The purpose is to make the display easy to see and eliminate the possibility of misidentification, while also allowing the display to be displayed in a relatively small display area.

Structure of the Invention In order to achieve the above object, the present invention measures the systolic blood pressure value and the diastolic blood pressure value based on the pressure of a cuff whose internal pressure is changed and the change in the artery compressed by the cuff. The intensity of the pulse wave that changes with changes in cuff pressure is expressed as a two-dimensional chart consisting of a pressure axis with the cuff pressure as a variable and a pulse wave axis with the pulse wave intensity as a variable,
a dot matrix display consisting of a large number of l-soto display elements, and displays the intensity of the pulse wave corresponding to the pressure value of each cuff when the systolic blood pressure value and the diastolic blood pressure value are measured. The display element is made to blink.

As a result of the invention, by doing this, the relationship between the cuff pressure change and the pulse wave intensity is displayed by lighting up on the dot throat display element on the dot matrix display, and the door 1 display that is lit up is displayed. Since the ones corresponding to the systolic blood pressure value and the diastolic blood pressure value among the clusters are made to blink, the display becomes easy to see and the validity of the blood pressure measurement can be easily and accurately judged. This makes it possible to make it simpler and smaller than a display device or the like.

EXAMPLE Hereinafter, an example of a blood pressure measuring device to which the present invention can be suitably applied will be described in detail based on charts.

In the following description, the present invention will be explained in the case where the present invention is applied to an oscillometric blood pressure measurement device that detects pulse waves as internal pressure vibrations in a cuff, but pulse waves can be detected using other methods such as a microphone method or an ultrasonic method. The present invention can be similarly applied to a blood pressure measuring device that detects waves.

In FIG. 2, 10 is a bag-shaped cuff for compressing the arm of a human body, and the cuff 10 detects the pressure inside the cuff () and outputs a pressure signal SP representing the pressure. Pressure sensor 12. An electric pump 14 that supplies pressure inside the cuff 10 and increases it. A rapid exhaust electromagnetic valve 16 that quickly lowers the pressure inside the cuff 10 at the end of blood pressure measurement.
is connected to the constant-speed exhaust solenoid valve 18 for gradually lowering the pressure inside the cuff 10 during blood pressure measurement.
are connected via the diaphragm 20.

The pressure signal SI) output from the pressure sensor 12 is sent to a pulse wave remover 26 and a pulse wave detector 28 via an amplifier 24.
are supplied respectively. The pulse wave remover 26 is equipped with a low-pass filter and an A/I converter, and uses the pressure signal SP to generate pulse wave oscillations that are synchronized with the human body's pulse. l1IJ
After removing the components, the signal representative of the static pressure within the cuff 10 is converted into a digitally coded pressure signal S I' l) and supplied to the I10 boat 30. The pulse wave detector 28 includes a bandpass filter and an A/D converter, and, contrary to the pulse/JJl remover 26, extracts only the pulse wave component from the pressure signal sp, converts it into a digital code, and generates a pulse wave signal. After converting to SMD, it is supplied to the I10 boat 30. Further, the I10 boat 30 is supplied with a start signal SC from a start switch SW.

110 ports and 30 ports connect the CPU via the data bus line.
34. RAM36. It is connected to ROM38 and the CP
U34 utilizes the temporary storage function of RAM36 and stores it in ROM.
Processing the signal supplied to the I10 boat 30 according to the progera J. prestored in the pump 14. Drive signals PD, MD1 . MD2 is supplied respectively. Further, the display device 40 is supplied with a display signal DD.

As shown in the perspective view of FIG. 3, the display device 40 is equipped with displays 42 and 44 that numerically display the diastolic blood pressure value and the systolic blood pressure value on the left and right sides of the front, and a dot in the center thereof. A 7-trix display 46 is provided. Further, an opening 47 is provided on the top surface of this display device 40, through which a chart (not shown) on which systolic blood pressure values, diastolic blood pressure values, etc. are printed is sent out. - This is a receiving antenna that receives display signal 1) D.

A large number of LEDs 48 as dot 7 trix elements are arranged vertically and horizontally in a grid pattern, and a transparent cover of a color similar to the emitted light color (for example, red) is fixed thereon. It lights up as a chart showing the strength of the pulse wave as it changes.As shown in Figure 4, a large number of L E I
) 48 constitutes a two-dimensional chart when the light is displayed, with the pressure axis as the horizontal axis 50 representing the pressure of the cuff 10 as a variable, and the vertical axis as the pulse wave axis representing the pulse wave intensity as the variable. The strength of the pulse wave at each pressure value of the cuff lO is calculated by LIA.
I) It is displayed with 48 lighting numbers. In addition, among the LEDs 4B lit in this way, those corresponding to the pressure values of the cuffs 10 when the systolic blood pressure value and the diastolic blood pressure value were measured are used to indicate the pulse wave generation of the subject. It is designed to flash in synchronization with the In addition, FIG. 4 is a diagram for explaining that a two-dimensional chart is constructed by a large number of LEDs 48. In the translucent cover of the Doso Tomato Sock display 46, the horizontal axis 50 represents the pressure of the cuff 10. Only the values are shown, and the vertical axis 52 is not shown. Also, the O mark in Fig. 4 indicates the LED 48.
, the ■ mark means blinking, and the * mark means turning off the light.

Next, the operation of this embodiment will be explained according to flowchart 1 in FIG.

First, the start switch SW is operated and the start signal SC is [
10 is supplied to the boat 30, step S1 is executed, the solenoid valves 16 and 18 are closed, and the pump 1
4 is the drive f. ″rυP L).

Therefore, the pressure of the cuff 1o is increased, and the part of the human body around which the cuff 10 is wrapped is compressed. Then step s2 is carried out, in which the actual pressure P in the cuff 1o represented by the pressure signal S l) I) is equal to the predetermined maximum pressure PII.
It is determined whether lax has been reached or not. If it has not been reached, step S2 is executed or repeated, but if it has been reached, step S3 is executed and the pump 14 is stopped.

Note that the preset maximum pressure Pmax is set higher than the systolic blood pressure value of the subject.

Subsequently, step S4 is executed, and the constant speed exhaust solenoid valve 1
8 is opened in accordance with drive signal MD2.

For this reason, the air in the cuff lO is
8 and the pressure of the cuff lO is slowly reduced. Then-C1 In this state, the blood pressure value determination routine of step S5 is executed, and the systolic blood pressure value and the diastolic blood pressure value are determined.

In the blood pressure value determination routine, as explained based on FIG.
! In relation to the pressure of the cuff 10 represented by the pressure signal S P ], The pressure in the cuff 10 when it increases is determined to be the systolic blood pressure value, and the pressure in the cuff 10 when it suddenly decreases is determined to be the diastolic blood pressure value.These blood pressure values are then numerically displayed on the displays 44 and 42, respectively. Then, G-d, sequential distribution 1.
The relationship between the peak value of the pulse wave and the pressure of the cuff 10 is displayed on the dot matrix display 46, and the dot matrix display 46 is lit. ! ! 10 of item J' The pressure value corresponding to the pressure value of the cuff 10 when the blood pressure value and the diastolic blood pressure value are measured is flashed in synchronization with the detection of the pulse wave.

By the way, noise such as artifact 1- or an electric scalpel may be mixed into the pressure signal SPD or pulse wave signal SMD, and if this noise is processed as a pulse wave, the systolic blood pressure value or diastolic blood pressure value may be incorrectly calculated. However, in this embodiment, the change in pulse wave intensity (peak value) is displayed on the dot matrix display 46, so the change may be discontinuous or may occur at adjacent positions. If the field lightning shows a high value compared to the peak value of , it can be easily inferred that it is caused by noise or other factors. In addition, since L E I) 48 corresponding to the pressure value determined together with the systolic blood pressure value and the diastolic blood pressure value is blinking, the pulse wave force expressed by L E' and L E 48 is blinking. If the problem is caused by noise, it can be determined that the measurement of the systolic blood pressure value and diastolic blood pressure value was inappropriate.

Moreover, by lighting and blinking L E I) 4.8, the pulse wave corresponding to the measured blood pressure value or the display showing changes in pulse wave intensity is displayed overlappingly. , compared to the case where they were displayed in different positions in the past, the display is much easier to see, making it easier and more accurate to judge whether the blood pressure measurement status is correct, and making up the display area. The number of pixels is reduced, and the display device 40 can be constructed simply and compactly by reducing the number of pixels required for the CR'1' display device. In addition, in this embodiment, since the point/l configuration of L I'El) 48 is performed in synchronization with the detection of the pulse wave of the subject, it is possible to determine whether the blood pressure measurement is appropriate or not. At the same time as 11i'i, it is also possible to observe the pulse generation state of the subject.

After the determination and display of the blood pressure value as described above is executed in the blood pressure value determination routine of step S5,
When step S6 is executed and the rapid exhaust electromagnetic valve 16 is opened in accordance with the drive signal M1]1, the air in the cuff 10 is rapidly exhausted and the series of blood pressure measurements is completed.

Although one embodiment of the blood pressure measuring device in which the present invention can be suitably implemented has been described above, the present invention can also be implemented in other embodiments.

For example, in the above-described embodiment, in order to display the relationship between the pressure of the cuff 10 and the intensity (peak value) of the pulse wave, LED 48 of the dot matrix display 46 is lit in the form of a bar graph. It is also possible to display it in the shape of a broken line club by lighting only the LED 48 on the finger.

In addition, after the systolic blood pressure value and the diastolic blood pressure value are determined, the LEI 48 is turned on and blinking at the same time, or the pressure of the cuff 10 reaches a predetermined value of 10 on the dot matrix display 46. Each time a pulse wave is detected, LI! indicates its intensity (its peak value). , D
48 in sequence, and then the maximum [[LI Ii
When the l value and the value for the lowest surface are determined, a predetermined value of 1. , E
i-, ) 48 may be made to blink. In this case, there is an advantage that the progress of blood pressure measurement can also be observed.

Furthermore, IR L 17048 is used as the display element of the 17 trix display 46, or other display elements such as a liquid crystal display 5 neo lamp may be used.

Furthermore, it goes without saying that the display device 40 may be integrated into the blood pressure measuring device.

In addition, it goes without saying that the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art without departing from its spirit.

[Brief explanation of the drawing]

FIG. 1 is a chart for explaining the relationship between general cuff pressure and pulse wave intensity. FIG. 2 shows an example of a blood pressure measuring device to which the present invention can be suitably applied. l! FIG. 2 is a block diagram showing an example configuration. FIG. 3 is a perspective view of the display device according to the embodiment of FIG. 2. FIG. 4 is a diagram-C for explaining the linox display for F Nos. 1 to 71 arranged in the display device of FIG. FIG. 5 is a flowchart illustrating the operation of the embodiment shown in FIG. 10: Cuff 40: Display device 46: Tosotoma 1 to Resox indicator 48: LED (
Dot display element) 50: Horizontal axis (pressure axis) 52: Vertical axis (pulse wave axis) Applicant
Nippon Kolin Co., Ltd. Figure 1

Claims (1)

[Claims] The systolic blood pressure value and the diastolic blood pressure value are measured based on the pressure of the cuff whose internal pressure is prevented from changing and the pulse wave of the artery compressed by the cuff. The strength of the pulse wave changes depending on the situation 1); The strength of the pulse wave is expressed as a two-dimensional diagram consisting of the pressure force of the cuff and the pulse wave force where the strength of the pulse wave is the variable. 1. Displays the pressure value of each cuff when the systolic blood pressure value and diastolic blood IE value are measured. A blood pressure measurement status table small force method characterized in that the intensity of the pulse wave is displayed by 1 and 7.