JPH1133006A - Data processing method in oscillometric type electronic sphygmomanometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent error measurement due to shortage of memory capacity by compressing a plurality of pulse pressures and/or pulse amplitudes so as to store them as a single data in the memory when the data concerning the detected pulse pressures and pulse amplitudes are stored are stored into the memory. SOLUTION: When a pulse detecting means 11 detects a first pulse, the pulse pressure at that time is stored in a memory 12. When second-fourth pulses are detected, a difference between the pulse pressure at that time and the previous one is found by means of a computing means 13 so as to be stored in the memory 12. Subsequently, when the fifth pulse is detected, a difference between the fourth pulse pressure and the fifth pulse pressure is found by means of the computing means 13, and the difference is stored in the memory 12, while on the basis of intervals between pulses from the first pulse to the fifth pulse, the number of pulses and a slow leak quantity are computed by means of the computing means 13, and then, the number of data to be stored is determined. Then, a compression ratio is decided, a mean value for a plurality of data is found so as to be stored in the memory 12 as a single data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for compressing an artery with a cuff, detecting a pulse wave in the process of changing the cuff pressure, and measuring a blood pressure based on a relationship between the pulse wave pressure (cuff pressure) and the pulse wave amplitude. The present invention relates to an oscillometric electronic sphygmomanometer to be determined, and more particularly to an oscillometric electronic sphygmomanometer in which data relating to pulse wave pressure and pulse wave amplitude is compressed and stored in a memory so that the memory can be effectively used.

[0002]

2. Description of the Related Art In an oscillometric electronic sphygmomanometer, a cuff is wrapped around the upper arm of a subject to be measured, the cuff is pressurized, an artery is compressed, blood is blocked, and the pressure is reduced by a cuff pressure detecting means. While detecting the cuff pressure (pulse wave pressure), the pulse wave amplitude detecting means detects a pulse wave component superimposed on the cuff pressure signal, and converts the pulse wave information of the pulse wave component into a pulse wave amplitude sequence, Further, the blood pressure is determined based on the maximum value of the pulse wave amplitude and the cuff pressure. For example, the cuff pressure corresponding to the maximum value of the pulse wave amplitude is the average blood pressure, the cuff pressure corresponding to the pulse wave amplitude on the high cuff pressure side corresponding to 50% of the maximum value of the pulse wave amplitude is the systolic blood pressure, The cuff pressure corresponding to the pulse wave amplitude on the low cuff pressure side corresponding to 70% of the maximum value is determined as the diastolic blood pressure.

In order to determine the blood pressure in this way, the electronic sphygmomanometer has a built-in memory for storing data on pulse wave pressure (cuff pressure) and pulse wave amplitude. Conventionally, this memory can store 37 sets of data on pulse wave pressure and pulse wave amplitude in order to prevent the electronic blood pressure monitor from becoming large.

[0004]

In an oscillometric electronic sphygmomanometer, the pulse wave pressure to be detected based on the difference between the initial pulse wave pressure at the start of pulse wave detection and the diastolic blood pressure, the amount of slow leak and the pulse rate. The number of data of pulse wave amplitude is determined,
If the pulse rate is somewhat large or the pulse wave pressure at the start of pulse wave detection is slightly high, the number of pulse wave pressure and pulse wave amplitude data to be detected easily exceeds 37. Therefore, in the conventional oscillometric electronic sphygmomanometer, measurement errors often occur due to insufficient memory capacity.

The present invention has been made in view of the above-mentioned circumstances, and compresses data to be stored in a memory so that a large amount of data can be stored in the memory. It is an object of the present invention to provide an oscillometric electronic sphygmomanometer in which an error is prevented.

[0006]

In order to achieve the above object, the invention according to claim 1 detects data relating to pulse wave pressure and pulse wave amplitude, stores the data in a memory, and then stores the data in the memory. In an oscillometric electronic sphygmomanometer which calculates and determines a blood pressure value, a plurality of pulse wave pressures and / or pulse wave amplitudes are compressed when storing data relating to the detected pulse wave pressure and pulse wave amplitude in a memory. The data is stored in the memory as one piece of data.

As a result, a plurality of data can be stored as one data, and the number of data that can be stored in the entire memory increases.

According to a second aspect of the present invention, a pulse rate and a pulse wave amplitude are obtained by detecting a pulse wave pressure and a pulse wave amplitude of a plurality of pulse waves from the first pulse wave for which detection has been started, Based on the pulse rate, the amount of slow leak, and the pulse wave pressure of the first pulse wave, the pulse wave pressure and / or
Alternatively, the number of data relating to the pulse wave amplitude is determined.

Thus, the number of data relating to the pulse wave pressure and / or the pulse wave amplitude to be stored in the memory is determined. Therefore, it is possible to determine how much data should be compressed in order to store all the data in the memory.

Here, as a method of compressing data,
Although various methods are conceivable, for example, as described in claim 3, the average value of the detection data on the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected a plurality of times can be used as the compression processing data. In addition, as described in claim 4, the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected this time are subtracted from the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected last time or a plurality of times before. The difference can be used as compression processing data. In this way, the data can be compressed by a relatively simple operation.

Further, according to the fifth aspect of the present invention, the average value of the data relating to the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected a plurality of times is obtained, and the average value obtained this time is used for the previous time or a plurality of times. The difference obtained by subtracting the previously obtained average value is used as compression processing data. In the invention according to claim 6,
The difference is obtained by subtracting the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected this time from the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected last time or a plurality of times before, and obtaining the difference. The average of a plurality of data is used as compression processing data. In this way, data can be further compressed.

Further, according to the invention described in claim 7, the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected N times is calculated as N- (N-
1) Compressed data is obtained by thinning out the pulse wave pressure and / or pulse wave amplitude for each time. In this way, data can be compressed without performing any arithmetic processing. Furthermore, in the invention according to claim 8, N- (N-1) pulse wave pressures and / or pulse wave amplitudes for N- (N-1) times are thinned out from the pulse wave pressures and / or pulse wave amplitudes of the pulse waves detected N times last time. The data obtained by thinning out the pulse wave pressure and / or amplitude of N- (N-1) times from the pulse wave pressure and / or pulse wave amplitude of the pulse wave detected N times from the data obtained in The result of the subtraction is used as compressed data. By doing so, data can be further compressed.

According to the ninth aspect of the present invention, the pulse wave pressure for obtaining the average value is determined based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave. And / or the number of data relating to the pulse wave amplitude is determined.
In the invention according to claim 10, the pulse wave pressure and / or the pulse wave of the pulse wave detected this time are determined based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave. It is determined how many times the amplitude should be subtracted from the pulse wave pressure and / or pulse wave amplitude of the previously detected pulse wave. According to the eleventh aspect, the pulse wave pressure and / or the pulse wave of the pulse wave detected N times are determined based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave. It is determined how many times the pulse wave pressure and / or the pulse wave amplitude of the pulse wave are to be reduced from the wave amplitude.
In this way, it is possible to easily determine how many times the detected data should be compressed into one data.

[0014]

Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration diagram of an oscillometric electronic sphygmomanometer for performing the data processing method according to the present embodiment. The electronic sphygmomanometer shown in FIG. 1 includes a cuff 1 for compressing a subject's artery, a cuff pressure adjusting unit 2 for increasing and decreasing the cuff 1 to a predetermined pressure, and detecting a pressure of the cuff 1 and obtaining the result. A cuff pressure detecting means 3 for A / D conversion and output, and a blood pressure is measured based on a signal from the cuff pressure detecting means 3 and a cuff pressure adjusting means 2
And a control unit 10 for sending a control signal to the cuff pressure detecting means 3. The electronic sphygmomanometer has a liquid crystal display 4 for displaying the measurement result and a buzzer 5 for notifying the end of the blood pressure measurement.
And a power source battery 6 and operation means 7 for operating these.

Here, the cuff pressure adjusting means 2 includes a pump 2a
And an electromagnetic valve 2b and an automatic exhaust valve 2c. The cuff pressure adjusting means 2 operates when the measurement is started by the operating means 7 after the cuff 1 is wound around the upper arm of the subject. That is, when an operation signal is sent through the control unit 10, air is sent to the cuff 1 by the pump 2a to start pressurization, thereby automatically increasing the pressure to a preset pressure, for example, 220 mmHg. The exhaust valve 2c operates to gradually exhaust the pressure in the cuff 1 at a speed of, for example, 4 mHg / sec to reduce the cuff pressure. Then, when a blood pressure measurement end signal is sent from the control unit 10, the solenoid valve 2b is operated to release the pressure in the cuff 1 and return to the atmospheric pressure.

Next, the control unit 10 will be described. The control unit 10 receives signals from the cuff pressure detecting means 3 and the operating means 7 and controls the cuff pressure adjusting means 2, the cuff pressure detecting means 3, the liquid crystal display 4, and the oscillometric electronic sphygmomanometer.
And controls the operation of the buzzer 5, etc.
Determine the value of the measured blood pressure.

FIG. 2 is a block diagram showing an example of a configuration of the blood pressure determination system in the control section 10. As shown in FIG. The blood pressure determining system includes a pulse wave amplitude detecting means 11, a memory 12, a calculating means 13, a blood pressure determining means 14, and a control means (not shown) for controlling these. Here, the arithmetic means 13 and a control means (not shown) have a function of compressing and decompressing data.

The pulse wave detecting means 11 detects the cuff pressure as the pulse wave pressure at the start (at the rise) of the pulse wave, and detects the height of the pulse wave at this time as the pulse wave amplitude. And
The pulse wave pressure and the pulse wave amplitude are temporarily stored in the memory 12 as a set as data relating to the pulse wave. The calculating means 13 calculates the pulse rate based on a plurality of data (for example, five data) relating to the pulse wave pressure and the pulse wave amplitude temporarily stored in the memory 12 in accordance with an instruction from the control means (not shown). The amount of slow leak is calculated based on the pulse rate obtained.

The control means (not shown) determines the number of data to be stored based on the pulse rate and the amount of slow leak obtained by the calculation means 13. Then, based on the number of data to be stored and the initial pulse wave pressure when the detection of the pulse wave is started, it is determined how much the detected data is to be compressed. Perform a predetermined calculation. For example, the calculating means 13 obtains an average value of a plurality of pieces of data relating to the detected pulse wave pressure and the detected pulse wave amplitude, and stores the average value in the memory 12 as compressed data.

The blood pressure determining means 14 is, as described above,
The average blood pressure, systolic blood pressure, and diastolic blood pressure are determined by an oscillometric method based on a predetermined number of pulse wave pressures and pulse wave amplitude compressed data stored in the memory 12.

Next, an embodiment of a data processing method in the oscillometric electronic sphygmomanometer according to the present invention will be described with reference to flowcharts shown in FIGS. First,
The cuff 1, which is a band, is wound around the upper arm of the subject, and the operating means is operated to send air by the pump 2a of the cuff pressure adjusting means 2 to start pressurization. After the pressure is increased to, for example, 220 mmHg, the pressure is gradually reduced by the automatic exhaust valve 2c, and measurement is started. Thereby, the pulse wave detecting means 11 detects a pulse wave (S101).

If the detected pulse wave is the first pulse wave, the pulse wave pressure at that time is stored in the memory 12 (S102, S102).
103) In the case of the second to fourth pulse waves, the difference between the pulse wave pressure at that time and the previous pulse wave pressure is obtained by the calculating means 13 and the difference is stored in the memory 12 (S104, S10).
5). Next, when the fifth pulse wave is detected, the difference from the fourth pulse wave pressure is obtained by the calculating means 13 and the difference is stored in the memory 1.
2 (S107), and the calculating means 13 calculates the pulse rate (pulse wave number per minute) based on the intervals of the pulse waves up to the fifth (S108). The calculating means 13 calculates the amount of slow leak based on the pulse rate (S109).

Next, the number of data to be stored is determined based on the calculated pulse rate and the amount of slow leak (S11).
0). For example, if the pulse rate is 90 times / min, the amount of slow leak is 2 mmHg / sec, and the initial pulse wave pressure is 170 mmHg, 70
When measuring up to mmHg, 90 data are detected, but since the memory 12 has only 37 data, the compression ratio is determined in the following steps. In this case, since the number of data to be detected also changes according to the magnitude of the initial pulse wave pressure, the compression ratio is changed according to the initial pulse wave pressure.

In the present embodiment, an average value of a plurality of data is obtained and stored as one data in a memory. Specifically, the initial pulse wave pressure> 220 mm
In the case of Hg, an average value of four data is obtained (S111,
S112), 220 mmHg> first pulse wave pressure> 160 m
In the case of mHg, an average value of three data is obtained (S11
3, S114), 160 mmHg> first pulse wave pressure> 10
At 0 mmHg, the average value of the two data is calculated (S1
15, S116), and each is determined to be one data. When the initial pulse wave pressure is lower than 100 mmHg, the number of data to be detected is small and all data can be stored in the memory 12, so that no data compression is performed (S117).

As described above, the conditions for detecting and storing data relating to the pulse wave pressure and the pulse wave amplitude are determined by the first to fifth pulse waves. Therefore, the detection data relating to the pulse wave pressure and the pulse wave amplitude of the sixth and subsequent pulse waves are sequentially compressed and stored in the memory 12, and data necessary for blood pressure determination is accumulated. For example, if the initial pulse wave pressure is 170
mmHg, step (S113, S1
Since the average value of the three data detected in 14) is determined to be one data, 6 to 8
Data on the pulse wave pressure and the pulse wave amplitude of the second pulse wave are sequentially calculated (S118, S119, S120, S121). Then, when three data are detected and summed, (S
120), divide the summed pulse wave pressure and pulse wave amplitude by 3 to obtain an average value (compressed data) of the pulse wave pressure and the pulse wave amplitude,
(S122, S123), and this is stored in the memory 12 (124).

As described above, when the average value of the three detected data is compressed into one data and stored in the memory 12, the necessary data is stored with a memory capacity of 1/3 of the conventional one as shown in FIG. be able to. When the three pulse wave pressures and the detection data relating to the pulse wave amplitude are summed to obtain an average value, the sixth to eighth pulse wave pressure and pulse wave amplitude data which have been summed are deleted, and (S125, S126) ), 9 ~
The eleventh, twelfth to fourteenth,. . . , The compressed data (average value) is sequentially obtained based on the above data and stored in the memory 12.

In this way, when the data relating to the detected pulse wave pressure and pulse wave amplitude is sequentially compressed and stored in the memory 12 and accumulated until the blood pressure can be determined, the blood pressure determining means 14 determines the blood pressure. It is determined (S127). Specifically, when the maximum pulse wave amplitude is determined based on the data stored in the memory 12, the pulse wave pressure at that time is set as the average blood pressure value, and the high cuff corresponding to 50% of the maximum pulse wave amplitude is determined. The pulse wave pressure on the compression side is determined as the maximum blood pressure value, and the pulse wave pressure on the low cuff pressure side corresponding to 70% is determined as the minimum blood pressure value.

When the systolic blood pressure value and the diastolic blood pressure value are determined in this way, the values are displayed on the liquid crystal display 4, and the solenoid valve 2b is opened by a signal from the control unit 10 to open the cuff. Of air is rapidly eliminated.

In the present invention, the method of compressing the detected data is not only the above-mentioned method of calculating the average value, but also the method of calculating the difference between the previous or a plurality of previous detected data and the current detected data, or N ( Times) from the detected data (N-
1) A method of thinning out (detected) pieces of detection data can be considered. For example, in the method of calculating the difference between the current detection data from the previous detection data regarding pulse wave pressure and pulse wave amplitude,
As shown in FIG. 6, it is possible to store necessary data with a memory capacity of 3/10 of the conventional memory capacity. As described above, in the method of storing the difference between the detection data in the memory 12,
When the blood pressure is determined by the blood pressure determining means, it is performed after decompressing the data and returning to the original detection data.

In the present invention, it is possible to combine the above-described detection data compression processing methods. For example, as a method of calculating the average value of the data on the pulse wave pressure and the pulse wave amplitude detected a plurality of times, and subtracting the average value obtained this time from the average value obtained last time or a plurality of times before to obtain the difference. Conversely, the pulse wave pressure and the pulse wave amplitude detected this time are subtracted from the pulse wave pressure and the pulse wave amplitude detected last time or a plurality of times before to obtain the difference, and a plurality of the difference data is obtained. It is also possible to adopt a method in which an average value of minutes is obtained. Further, a combination of a method of thinning out detection data and a method of obtaining a difference or a method of obtaining an average value may be used, and a combination of a method of thinning out detection data, a method of obtaining a difference, and a method of obtaining an average value may be used. You may.

The present invention is not limited to the above embodiment, but includes various modifications within the scope of the gist. For example, in the above-described embodiment, an example has been described in which both data relating to pulse wave pressure and pulse wave amplitude are compressed, but only one of the data of pulse wave pressure and pulse wave amplitude is compressed. There may be. In particular, since the pulse wave pressure has a large number of digits, the effect of the compression processing is large.

[0032]

As described above, according to the data processing method in the oscillometric electronic sphygmomanometer of the present invention, it is possible to eliminate a measurement error due to a memory capacity shortage and to reliably perform a blood pressure measurement.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an oscillometric electronic sphygmomanometer for implementing a data processing method of the present invention.

FIG. 2 is a block diagram showing a part of a control unit in FIG. 1;

FIG. 3 is a flowchart for explaining a data processing method of the oscillometric electronic sphygmomanometer according to the embodiment.

FIG. 4 is a flowchart for explaining a data processing method of the oscillometric electronic sphygmomanometer according to the embodiment.

FIG. 5 is a schematic diagram when data is stored in a memory.

FIG. 6 is a simulation diagram when data is stored in a memory.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cuff 2 cuff pressure adjusting means 3 cuff pressure detecting means 10 control unit 11 pulse wave detecting means 12 memory 13 calculating means 14 blood pressure determining means

Claims (11)

[Claims] 1. An oscillometric electronic sphygmomanometer which detects data relating to a pulse wave pressure and a pulse wave amplitude, stores the data in a memory, and thereafter calculates and determines a blood pressure value based on a relationship between the two. An oscillometric method for storing a plurality of data relating to pulse wave pressure and / or pulse wave amplitude in a memory, and compressing a plurality of data relating to a pulse wave pressure and / or a pulse wave amplitude and storing the data as one data; Data processing method in a portable electronic sphygmomanometer. 2. A pulse wave pressure and a pulse wave amplitude of a plurality of pulse waves are detected from a first pulse wave for which detection is started to obtain a pulse rate and a slow leak amount. 2. The oscillometric electronic sphygmomanometer according to claim 1, wherein the number of data relating to the pulse wave pressure and / or the pulse wave amplitude to be stored in the memory is determined based on the pulse wave pressure of the first pulse wave. Data processing method. 3. The pulse wave pressure and / or pulse wave amplitude data subjected to the compression processing is an average value of detection data on pulse wave pressures and / or pulse wave amplitudes of pulse waves detected a plurality of times. Claim 1
Or a data processing method in the oscillometric electronic sphygmomanometer according to 2. 4. The pulse wave pressure and / or pulse wave amplitude data subjected to the compression processing is obtained from the pulse wave pressure and / or pulse wave amplitude of the pulse wave detected last time or a plurality of times before and the pulse wave detected this time. 3. The data processing method in an oscillometric electronic sphygmomanometer according to claim 1, wherein the difference is a difference obtained by subtracting a pulse wave pressure and / or a pulse wave amplitude. 5. The compression-processed pulse wave pressure and / or pulse wave amplitude data is obtained by calculating an average value of pulse wave pressure and / or pulse wave amplitude data of a plurality of detected pulse waves, and 3. The data processing method in an oscillometric electronic sphygmomanometer according to claim 1, wherein the difference is obtained by subtracting the calculated average value from the average value obtained last time or a plurality of times before. 6. The data on the pulse wave pressure and / or pulse wave amplitude subjected to the compression processing is obtained from the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected last time or a plurality of times before. 2. The method according to claim 1, wherein the difference is obtained by subtracting the pulse wave pressure and / or the pulse wave amplitude, and an average value of a plurality of the differences is obtained.
Or a data processing method in the oscillometric electronic sphygmomanometer according to 2. 7. The compressed pulse wave pressure and / or pulse wave amplitude data is obtained from the pulse wave pressure and / or pulse wave amplitude detected N times by N-
3. The data processing method for an oscillometric electronic sphygmomanometer according to claim 1, wherein the pulse wave pressure and / or the pulse wave amplitude for (N-1) times are thinned out. 8. The pulse-wave pressure and / or pulse-wave amplitude data subjected to the compression processing is N- (N-1) times from the pulse-wave pressure and / or pulse-wave amplitude of the pulse wave detected N times previously. From the data obtained by thinning out the pulse wave pressure and / or pulse wave amplitude of the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected N times this time, N- (N-1) pulse wave pressures and 3. The data processing method for an oscillometric electronic sphygmomanometer according to claim 1, wherein data obtained by thinning out the pulse wave amplitude is subtracted. 9. Based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave, the number of data relating to the pulse wave pressure and / or the pulse wave amplitude for obtaining the average value is calculated. 7. The data processing method in an oscillometric electronic sphygmomanometer according to claim 3, wherein the determination is performed. 10. A pulse wave of a pulse wave detected several times earlier based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave. 7. The data processing in the oscillometric electronic sphygmomanometer according to claim 4, wherein it is determined whether to subtract from the wave pressure and the pulse wave amplitude. 11. Based on the number of data to be stored in the memory and the magnitude of the pulse wave pressure of the first pulse wave, a number of times from the pulse wave pressure and / or the pulse wave amplitude of the pulse wave detected N times. 8. The data processing method in an oscillometric electronic sphygmomanometer according to claim 7, wherein whether to reduce the pulse wave pressure and / or the pulse wave amplitude of the pulse wave is determined.