JPH0614893A - Blood pressure measuring instrument - Google Patents

Abstract

PURPOSE:To detect changes in the blood pressure values meeting individual persons by providing a control means which sets the fluctuation width of the blood pressure in accordance with the first measured reference blood pressure value and triggers an alarm when the ratio of the difference between the second and subsequent measured blood pressure values and the reference blood pressure to the reference blood pressure deviates from the fluctuation width of the blood pressure. CONSTITUTION:A control section 17 has a CPU, ROM, RAM, timer circuit, etc. A pressurization signal is supplied to a pressurizing device 10 and the operation is stopped and a discharge signal is supplied to a discharge valve 11 at the point of the time the max. blood pressure is obtd. from the pressure signal of the pressurizing device. A control section 17 calculates the blood pressure value (reference blood pressure value) and determines the fluctuation width of the blood pressure by making the value as 100%. The determination is executed by referencing to a table stored in the ROM. The value is written into the RAM. The operation is thereafter stopped for one minute and the blood pressure measurement is started again. The difference from the reference blood pressure value is determined and the ratio to the reference blood pressure value is determined. The alarm device 18 is triggered to stop the measurement when the ratio deviates from the fluctuation width of the blood pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood pressure measuring device,
Particularly, the present invention relates to a blood pressure measurement device capable of detecting a sudden blood pressure change.

[0002]

2. Description of the Related Art Conventionally, blood pressure measuring devices have been used in each medical institution, and have recently become popular in general households. The blood pressure measurement device is mainly composed of a cuff attached to a blood pressure measurement site such as an upper arm or a finger, and a device body that controls the cuff.

[0003]

By the way, in the conventional blood pressure measuring device, a setter for setting the upper limit value and the lower limit value of the blood pressure measurement range is provided, but there is a clear standard for these settings. Currently, doctors and nurses have set appropriate values. The reason for this is that it is basically unknown what the blood pressure value of the measurement subject is and what kind of blood pressure change it exhibits. Therefore, the change in blood pressure value depends on the blood pressure measurement range (mainly the lower limit value).
Unless the value falls below the range, changes in the subject's condition cannot be captured, and in particular, when the blood pressure value suddenly changes in a short time, the conventional setting method cannot capture it at all.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a blood pressure measuring device capable of capturing a change in blood pressure value suitable for each individual.

[0005]

A blood pressure measuring device according to claim 1, wherein a cuff attached to a blood pressure measuring portion, a pressurizing means for pressurizing the cuff, and a detecting means for detecting the cuff pressure of the cuff, A blood pressure measuring device comprising pulse wave detecting means for detecting a pulse wave based on the output of the detecting means, and blood pressure value calculating means for calculating a blood pressure value based on the detection result of the pulse wave detecting means. Blood pressure fluctuation width setting means for setting a blood pressure fluctuation width based on the reference blood pressure value obtained by the second blood pressure measurement, and the reference of the difference between the blood pressure value obtained in the second and subsequent blood pressure measurements and the reference blood pressure value. It is characterized by further comprising: control means for determining whether or not the ratio to the blood pressure value deviates from the blood pressure fluctuation range, and sounding an alarm when the ratio deviates.

A blood pressure measuring device according to a second aspect of the present invention includes a cuff to be attached to a blood pressure measuring site, and a pressurizing means for pressurizing the cuff.
Detection means for detecting the cuff pressure of the cuff, pulse wave detection means for detecting a pulse wave based on the output of the detection means, and blood pressure value calculation for calculating a blood pressure value based on the detection result of the pulse wave detection means In a blood pressure measuring device comprising means, a storage means for storing a blood pressure value obtained for each measurement, and a blood pressure value obtained in the previous measurement for each measurement is read from the storage means, and the read blood pressure value and Change rate calculating means for calculating a change rate of blood pressure based on the current blood pressure value, and determining whether the change rate calculated by the change rate calculating means is greater than a predetermined change rate However, it is characterized in that it is provided with a control means for sounding an alarm when it is large.

[0007]

According to the blood pressure measuring device of the first aspect, the blood pressure fluctuation range is set based on the blood pressure value (maximum blood pressure or average blood pressure) obtained by performing the blood pressure measurement once. And
It is determined whether or not the ratio of the difference between the blood pressure value obtained in the next measurement and the reference blood pressure value to the reference blood pressure value deviates from within the blood pressure fluctuation range. Sounds.

According to the blood pressure measuring device of the second aspect, the rate of change is calculated from the obtained blood pressure value and the previously measured blood pressure value each time the blood pressure is measured, and the rate of change is predetermined. If the rate of change is greater than the specified rate of change, an alarm sounds. Therefore, in any of the blood pressure measurement devices according to the first and second aspects, it is possible to capture a change in blood pressure value suitable for each individual.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing a blood pressure measurement device according to an embodiment of the present invention. This blood pressure measurement device adopts a step-up method. In this method, the cuff is pressurized in stages, and the measurement is terminated when the systolic blood pressure is detected.Therefore, it is not necessary to perform exhaust control only by performing pressurization control, It has the advantage that the measurement time is short (see Japanese Patent Application No. 3 for details.
-212632).

In FIG. 1, reference numeral 1 denotes a cuff for mounting on the upper arm, which is connected to the apparatus main body 3 via a tube 2.
In this case, the tube 2 is composed of two tubes for pressurization and exhaust.

Reference numeral 4 denotes a digital display section for displaying the maximum blood pressure, the minimum blood pressure, the average blood pressure and the pulse rate. Reference numeral 5 denotes a dot matrix display in which a plurality of light emitting diodes are arranged vertically and horizontally. When measuring a blood pressure, the pulse wave is displayed as a level as shown in the figure, and when not measuring, the function of the device is displayed. It should be noted that the function display of the device includes an alarm content at the time of an alarm, an elapsed time of a display measured value, an error content at the time of an error, and the like. Reference numeral 6 denotes various switches such as a power switch, a measurement start switch, a mode selection rotary switch, an alarm function selection switch, a measurement time setting device and a measurement interval setting device. A printer 7 prints the maximum blood pressure, the minimum blood pressure, the average blood pressure, the pulse rate, and the like.

FIG. 2 is a block diagram showing a schematic configuration of the present blood pressure measuring device. In this figure, 10 is a pressurizer, which supplies air to the cuff 1 according to the supplied pressurizing signal. The pressurization of the cuff 1 by the pressurizer 10 is performed stepwise. For example, as shown in FIG.
50mmHg in the stage, 100mmHg in the second stage, 1 in the third stage
50mmHg, and so on.

Returning to FIG. 2, 11 is an exhaust valve, which discharges the air in the cuff 1 based on the supplied exhaust signal. 1
Reference numeral 2 is a pressure sensor, which detects the pressure in the cuff 1 and outputs the result. Reference numeral 13 is a bandpass filter, which extracts low-frequency components of the signal output from the pressure sensor 12,
Extracted as a pulse wave signal.

An AC amplifier 14 amplifies the pulse wave signal extracted by the bandpass filter 13 to a predetermined level. The amplified pulse wave signal is input to the gain switcher 15 and the output level is adjusted. The level-adjusted pulse wave signal is an analog / digital (A / D) converter 1
It is input to 6 and is digitally converted. The A / D converter 16 has two input ports, one of which is supplied with the pulse wave signal output from the gain switcher 15, and the other of which is supplied with the pressure signal output from the pressure sensor 12. The output of the A / D converter 16 is input to the control unit 17.

The control section 17 controls each section of the apparatus, and comprises a CPU (central processing unit), a ROM (read only memory), a RAM (random access memory), a timer circuit and the like which are not shown. There is. C in ROM
A program for controlling the PU is written, and the control unit 17 pressurizes the cuff 1 according to this program and detects the pressure and the pulse wave.

A table showing the blood pressure value (maximum blood pressure or average blood pressure) versus blood pressure fluctuation range is written in the ROM. This table is a biological determination of how much the blood pressure value changes until it becomes dangerous. Also,
The ROM also stores a reference rate of change indicating a limit value of the rate of change between two blood pressure values that are temporally preceding and following.
This reference rate of change is a biological determination of how much the rate of change between the two blood pressure values becomes a dangerous state.

For example, as shown in FIG. 4, the blood pressure value of the subject under dialysis decreases with the passage of time, but there is no problem if this decrease rate is in the state shown by the thin solid line in the figure. However, if the descent rate becomes the state shown by the alternate long and short dash line in the figure, it is in a dangerous state. Thus, the reference rate of change is used to make this determination. In the figure, “90” is the lower limit of the conventional mean blood pressure.

Then, the systolic blood pressure, the diastolic blood pressure, the average blood pressure, the pulse rate, etc. are calculated from the obtained results and displayed on the digital display unit 4 and the dot marix display unit 5. The timing of pressurization is synchronized with the pulse wave, and the pressurization period is set to enter between the heartbeats before and after one heartbeat. Further, the control unit 17 has the following two functions in addition to the above functions. This function can be arbitrarily selected by the alarm function selection switch.

[Function A] The blood pressure fluctuation range (± several%) is determined with the reference blood pressure value (maximum blood pressure or average blood pressure) obtained in the first blood pressure measurement as 100%. The fluctuation range is determined by referring to the table stored in the ROM. It is determined whether or not the ratio of the difference between the blood pressure value obtained in the next blood pressure measurement and the reference blood pressure value to the reference blood pressure value deviates from the blood pressure fluctuation range set in the item. If it deviates from the blood pressure fluctuation range, the alarm device is activated, and if it does not deviate, nothing is done and blood pressure measurement is restarted.

[Function B] The blood pressure value (maximum blood pressure or average blood pressure) obtained for each blood pressure measurement is written in the RAM. The previous blood pressure value is read for each measurement, and the change rate is calculated from this blood pressure value and the current blood pressure value. If the calculated change rate is greater than the reference change rate, the alarm device is activated. Start the measurement.

Returning to FIG. 2, 18 is an alarm device. An input / output (I / O) unit 19 exchanges data between the control unit 17 and each unit of the apparatus. Reference numeral 20 is a dot matrix driver for driving the dot matrix display 5.

Next, the operation of the blood pressure measuring device having the above configuration in the long time measuring mode will be described. When this long time measurement mode is selected, the blood pressure is measured at the intervals set by the measurement interval setter for the period set by the measurement time setter. In the description of this operation, the case where the above functions A and B are selected will be described.

(1) When function A is selected First, after mounting the cuff 1 on the upper arm, a power switch (not shown) is turned on. Then, the rotary switch is set to the long-time measurement mode, and the measurement interval is set by the measurement interval setting device (here, 1 minute is set). Also, the measurement time is set by the measurement time setting device (here, 12
Time and).

When the measurement start switch is pressed after the above settings,
The control unit 17 confirms the setting state of the rotary switch and confirms the long-time measurement mode. Then, the measurement interval and the measurement time are confirmed. After confirming these, pressurizer 1
Apply pressure signal to 0. As a result, pressurization of the cuff 1 is started. Also, the timer circuit is operated at the same time when the pressurization is started.

When the cuff 1 is pressurized and the systolic blood pressure is obtained from the obtained pressure signal, the controller 17 stops the operation of the pressurizer 10. Then, an exhaust signal is supplied to the exhaust valve 11, and the valve is opened to perform exhaust. Next, the control unit 17 calculates a blood pressure value (reference blood pressure value) and sets this value to 100.
The blood pressure fluctuation range (± several%) is determined as%. The fluctuation range is determined by referring to the table stored in the ROM. The value of the determined blood pressure fluctuation range is written in the RAM.

After completing these processes, the control section 17
Stop the operation for the set time (1 minute). Then, after 1 minute has elapsed, blood pressure measurement is restarted and the blood pressure value is calculated.
After calculating the blood pressure value, the reference blood pressure value written in the RAM is read out, and the difference from this reference blood pressure value is obtained. Next, the ratio of the difference to the reference blood pressure value is obtained.

Then, it is judged whether or not the calculated ratio deviates from the blood pressure fluctuation range. If the ratio deviates, the alarm device 18 is operated and the blood pressure measurement is stopped. On the other hand, if there is no deviation, the blood pressure measurement is restarted without doing anything. In this way, when the rate of change of the blood pressure value deviates from within the blood pressure fluctuation range, an alarm sounds, so that a rapid blood pressure fluctuation can be detected.

The result of blood pressure measurement is displayed on the digital display unit 5 and printed by the printer 8. The above operation is performed until 12 hours later unless blood pressure fluctuation is abnormal.
Repeated every minute. If it is desired to stop the operation midway, a stop switch (not shown) may be pressed.

(2) When function B is selected When the measurement start switch is pressed after setting the long time measurement mode, measurement interval and measurement time, the control unit 17 causes the long time measurement mode, measurement interval and measurement. Check the time respectively. Then, after confirming these, a pressurizing signal is supplied to the pressurizer 10 to start pressurizing the cuff 1. Also, the timer circuit is operated at the same time when the pressurization is started.

When the cuff 1 is inflated and the systolic blood pressure is obtained from the obtained pressure signal, the control unit 17 stops the operation of the pressurizer 10 and then evacuates. Next, the blood pressure value is calculated, and this value is written in the RAM.

Next, the control unit 17 stops the measurement operation for 1 minute and then starts the blood pressure measurement again. Then, the rate of change is calculated from the obtained blood pressure value and the previous blood pressure value read from the RAM. Then, this change rate is compared with a predetermined reference change rate to determine whether or not the change rate is larger than the reference change rate.

In this determination, if the rate of change is higher than the reference rate of change, the alarm device 18 is activated and blood pressure measurement is stopped. On the other hand, if it is not large, the blood pressure measurement is restarted without doing anything, and the same operation as above is performed. In this way, when the rate of change between two blood pressure values that are temporally before and after becomes larger than the reference rate of change, an alarm sounds, so that a rapid blood pressure change can be detected.

The result of blood pressure measurement is displayed on the digital display unit 5 and printed by the printer 8. The above operation is performed until 12 hours later unless blood pressure fluctuation is abnormal.
Repeated every minute. If it is desired to stop the operation midway, a stop switch (not shown) may be pressed.

[0034]

As described above, the present invention, which is configured as described above, has the following effects. In the blood pressure measuring device according to claim 1, the blood pressure is measured once to obtain a reference blood pressure value, the blood pressure fluctuation range is set based on this reference blood pressure value, and the blood pressure value and the reference blood pressure obtained in the next blood pressure measurement. It is determined whether or not the ratio of the difference from the value to the reference blood pressure value deviates from within the blood pressure fluctuation range, and if it deviates, an alarm is sounded, and in the blood pressure measurement device according to claim 2, Every time blood pressure measurement is performed, the change rate is calculated from the blood pressure value measured last time, and if this change rate is larger than the predetermined change rate, the alarm is sounded.
Both have the effect of being able to detect a sudden blood pressure change.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a blood pressure measurement device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the same embodiment.

FIG. 3 is a waveform diagram for explaining one operation of the same embodiment.

FIG. 4 is a waveform chart for explaining one function of the embodiment.

[Explanation of symbols]

1 Cuff 3 Device Main Body 10 Pressurizer (Pressurizing Means) 11 Exhaust Valve 12 Pressure Sensor (Detecting Means) 13 Band Pass Filter (Pulse Wave Detecting Means) 17 Control Unit (Blood Pressure Calculating Means, Blood Pressure Fluctuation Width Setting Means, Control Means) Storage means, change rate calculation means)

Claims (2)

[Claims] 1. A cuff attached to a blood pressure measurement site, a pressurizing means for pressurizing the cuff, a detecting means for detecting the cuff pressure of the cuff, and a pulse for detecting a pulse wave based on the output of the detecting means. In a blood pressure measurement device comprising a wave detection means and a blood pressure value calculation means for calculating a blood pressure value based on the detection result of the pulse wave detection means, based on a reference blood pressure value obtained by the first blood pressure measurement. The blood pressure fluctuation range setting means for setting the blood pressure fluctuation range, and the ratio of the difference between the blood pressure value obtained in the second and subsequent blood pressure measurements and the reference blood pressure value to the reference blood pressure value deviates from the blood pressure fluctuation range. A blood pressure measurement device, comprising: a control unit that determines whether or not there is a deviation, and sounds an alarm if there is a deviation. 2. A cuff attached to a blood pressure measurement site, a pressurizing means for pressurizing the cuff, a detecting means for detecting the cuff pressure of the cuff, and a pulse for detecting a pulse wave based on the output of the detecting means. A blood pressure measuring device comprising: a wave detecting means; and a blood pressure value calculating means for calculating a blood pressure value based on the detection result of the pulse wave detecting means, a storage means for storing the blood pressure value obtained for each measurement, and a measurement For each time, the blood pressure value obtained in the previous measurement is read from the storage means, and a change rate calculation means for calculating the change rate of blood pressure based on the read blood pressure value and the current blood pressure value, and the change rate calculation means A blood pressure measuring device, comprising: a control unit that determines whether or not the change rate calculated by is greater than a predetermined change rate, and issues a warning if the change rate is greater than a predetermined change rate.