JPH0282940A - Electronic hemomanometer - Google Patents

Abstract

PURPOSE:To detect such a state that the winding of a cuff is loose to stop pressurization and to avoid the generation of congestion or measuring errors by judging that the winding of the cuff is loose and improper when a pressurizing speed is smaller than a reference value immediately after pressurization is started to operate a rapid pressure reducing means and informing a person to be measured of this state. CONSTITUTION:When it is supposed that a pressurizing speed is changed by DELTApm for a DELTAt-time after the start of pressurization immediately after pressurization is started, the value DELTApm/DELTAt is compared with a preliminarily stored reference value DELTAps/DELTAt. The reference value is set as a gradient value showing the boundary between a normal winding state and a loose winding state and, when the pressurizing speed is smaller than the reference value as the result of comparison, it is judged that winding is too loose and abnormal and a pressure pump 3 is turned OFF, that is, pressurization is stopped to open a quick exhaust valve 4. In order to further inform the mounting abnormality of the cuff, the figure or specific symbol of a display device 10 is turned ON and OFF. A person to be measured sees this ON/OFF lighting to be able to know the mounting abnormality of the cuff and can wind the cuff once more.

Description

[Detailed description of the invention] (a) Industrial application field This invention is an electronic blood pressure monitor, particularly for determining whether or not a cuff is wrapped normally, thereby preventing measurement errors and pain for non-measurers. Regarding the electronic blood pressure monitor obtained.

(B) Conventional technology A conventional electronic blood pressure monitor consists of a cuff with an air bag, a pump that pressurizes the cuff, a slow exhaust valve that slowly exhausts the pressure inside the cuff, and a cuff that slowly exhausts the pressure inside the cuff. A quick exhaust valve that quickly exhausts the air,
A pressure sensor that detects the pressure of the cuff, and a pressure sensor that turns on the pump.
In addition to controlling the opening/closing of 10 F F and rapid exhaust valve,
The device includes a blood pressure measuring unit (CPU) that measures blood pressure based on data sequentially fetched from the pressure sensor, and a display unit that displays the measured blood pressure. In this type of electronic sphygmomanometer, when measuring blood pressure, a cuff is first wrapped around the upper arm. Then, turn on the pump to start pressurizing the cuff, pressurize it to the set pressure value, and then turn the pump to 0.
FFL is a blood pressure measuring means that enters slow exhaustion and uses the well-known sound method and vibration method during the exhaustion process.
(systolic blood pressure) and DTA (diastolic blood pressure), and these S
YS and DrA are displayed on the display means.

(c) Problems to be Solved by the Invention In conventional electronic blood pressure monitors, pressurization by a pressurizing means such as a pump is regularly performed up to a pressure setting value.

On the other hand, the arm cuff is usually wrapped by the person being measured, and may be wrapped normally or loosely. If the arm cuff is loosely wrapped, the air capacity of the arm cuff becomes larger, so it takes longer to pressurize to the same pressure setting than when the cuff is wrapped normally, resulting in V♂ blood due to long-term compression. This poses a problem in that it causes pain to the person being measured and also causes errors in blood pressure measurements.

This invention was made in view of the above-mentioned problems, and detects the loosely wrapped state of the cuff, and when detected, stops pressurization to avoid congestion and measurement errors. The purpose is to provide an electronic blood pressure monitor.

(d) Means and Effects for Solving the Problems The electronic blood pressure monitor of the present invention includes: an arm cuff, a pressurizing means for pressurizing the arm cuff, a slow decompression means for slowly reducing the pressure in the arm cuff, and a An electronic sphygmomanometer comprising a rapid pressure reduction means for rapidly reducing the pressure in the cuff, and a blood pressure measurement means for measuring blood pressure during a slow depressurization process after the pressurization means pressurizes the cuff and stops applying pressure. , a pressurization speed measuring means for measuring the pressurization speed immediately after the start of pressurization, a means for comparing the measured pressurization speed with a reference value, and a notification means that operates when the pressurization speed is smaller than the reference value. In addition, when the pressurization rate is smaller than a reference value, the rapid pressure reduction means is operated.

In this electronic blood pressure monitor, when pressurization by the pressurizing means is started, the pressure within the cuff increases over time. The degree of increase in pressure, that is, the rate of pressurization, is smaller as the cuff is looser (see Figure 3). Therefore, the pressurization speed is measured by the pressurization speed measuring means immediately after the start of pressurization. This pressurization speed is compared with a reference value by the comparison means, and if the pressurization speed is smaller than the reference value, it is determined that the arm cuff is wrapped too loosely and is not appropriate, and the rapid decompression means is operated to reduce the pressure inside the arm cuff. At the same time, the notifying means is operated to inform the person to be measured of this fact.

(e) Examples The present invention will be explained in more detail with reference to Examples below.

FIG. 2 is a block diagram of an electronic blood pressure monitor in which the present invention is implemented. In the figure, a cuff (arm cuff) 1 includes a pressure sensor 2, a pressurizing pump 3, a rapid exhaust valve (rapid exhaust means) 4,
and a slow exhaust valve (low speed exhaust means) 5 via pipes 11, and are pressurized by a pressurizing pump 3.

Moreover, the pressure of the arm cuff l is converted into an electrical signal by the pressure sensor 2, and then sent to the CPU via an amplifier 6 and an A/D converter 7.
It is now being incorporated into 8.

The CPU 8 has a function of turning on the pressure pump 3 in response to the start switch 9 being turned on, and an A/D converter 7.
A function that captures a series of cuff pressure data input from
FF function, a function to extract, for example, DC component and pulse wave bone from a series of cuff pressure data taken in during the decompression process, and measure SYS, DIA, etc. by the so-called vibration method, in response to turning on the start switch 9. Close the quick exhaust valve 5,
It is equipped with a function related to a quick exhaust valve 4 upon completion of measurement. The measured SYS, DIA, etc. are displayed on the display 10.

The CPU 8 further has a function of measuring the pressurization speed Δpm/ΔL from the elapsed time Δoriginal change pressure Δps immediately after the start of pressurization;
A function to compare the measured pressurization speed with a reference value, and when the pressurization speed is smaller than the reference value, the rapid exhaust valve 4
and a function to blink the display 10 to notify that fact, that is, the pressurization speed is low and the cuff 1 is loosely wrapped.

Next, the operation of the electronic blood pressure monitor according to the embodiment will be explained according to the flowchart shown in FIG.

When measuring blood pressure, first the arm cuff 1 is attached to the upper arm [
Step (hereinafter referred to as rST) 1].

Then, when the start switch 9 is turned on, the pump 3
is turned on (Sr1). As a result, the pressure on arm cuff 1 is
As shown in Figure 3, it increases as time passes. Next, the pressurization speed is measured immediately after the start of pressurization (Sr1
). Pressurization speed is Δpm after the start of pressurization.
If it changes, it can be found from Δpm/Δt. Next, the measured pressurization speed and the pre-stored reference value Δps/Δ
t is compared, and it is determined whether Δpm/Δt>Δps/Δt (Sr4). The looser you wrap arm cuff 1, the more
As shown in the figure, the pressure change characteristic curve over time has a gentle slope. Therefore, the reference value is set as a gradient value (boundary pressurizing speed) that indicates the boundary between normal winding and loose winding (improper winding is the state), and specifically, Δt= 3.5sec, Δps=30mmH
It is set to g.

As a result of the comparison at Sr4, if the pressurization speed is higher than the reference value, it is determined that the winding is normal, and pressurization is continued up to the pressurization set value (Sr1). Then, when the pressure reaches the pressurization setting value, the pump 3 is set to 0FFL, that is, pressurization is stopped, and the blood pressure measurement process begins (Sr1), and the SYS, DIA, and PU
Determine whether LSE (pulse rate) is obtained (Sr7
). When the measurement results of SYS, DIA, and PULSE are obtained, they are displayed on the display 10 (Sr1).

If no measurement results are obtained for Sr7,
Returning to r1, the pressure is increased again to the pressurization setting value, and the blood pressure measurement process is performed again (Sr1). With Sr4, the comparison result is
If the pressurization speed is lower than the standard value, the winding will be too loose,
Assuming that there is an abnormality, the pump 3 is set to 0FFL, that is, the pressurization is stopped (5T9), and the rapid exhaust valve 4 is set to "open" (STI
O). As a result, the pressure on the cuff 1 that had been pressurized until then is released. Therefore, even if the winding is loose, it will not be unnecessarily pressurized for a long time. Further, in order to notify of an abnormality in the wearing of the wristband, the number or specific symbol on the display IO is blinked (STII). The person to be measured can visually observe this blinking light and know that there is an abnormality in wearing the arm cuff, and can then correct the wrapping of the arm cuff.

In the above embodiments, an example has been given in which the display device is flashed to indicate an abnormality in the wearing of the cuff, but other notification means, such as a buzzer, may be used.

(f) Effects of the Invention According to this invention, there is provided a pressurization speed measuring means for measuring the pressurization speed immediately after the pressurization starts, a means for comparing the measured pressurization speed with a reference value, and a pressurization speed measuring means for measuring the pressurization speed immediately after the pressurization starts. The device is equipped with an alarm means that operates when the pressurization speed is lower than the reference value, and when the pressurization speed is lower than the reference value, the rapid decompression means is operated to release the pressure inside the cuff, and the cuff is wrapped around the cuff. If the condition is abnormal, it will be detected immediately after the start of pressurization, the pressurization will be stopped, and the pressure inside the arm cuff will be released, so the upper arm will not be under pressure for a long time and the subject will is freed from the pain of congestion. In addition, the person to be measured will be notified of an abnormality when wearing a wristband.
Since this information can be known and the user can reattach the cuff, blood pressure measurement will not be continued with the cuff worn abnormally, and the occurrence of erroneous measurements can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram for explaining the operation of an electronic blood pressure monitor according to an embodiment of the present invention. FIG. 2 is a block diagram showing the hardware configuration of the electronic blood pressure monitor according to the embodiment. is a characteristic diagram for explaining the difference in pressure increase depending on the degree of winding. l: Bracelet, 2: Pressure sensor, 3: Pressure pump, 4: Rapid exhaust valve, 5: Slow exhaust valve, 8: CPU, 10: Display. Patent applicant Tateishi Electric Co., Ltd. Agent
Patent Attorney Shigeru Nakamura

Claims (1)

[Claims] (1) An arm cuff, a pressurizing means for pressurizing the arm cuff, a slow decompression means for slowly reducing the pressure in the cuff, a rapid depressurizing means for rapidly reducing the pressure in the cuff, and the pressurizing means for rapidly reducing the pressure in the cuff. In the electronic blood pressure monitor, the electronic blood pressure monitor includes a blood pressure measuring means for pressurizing the arm cuff by a means and a blood pressure measuring means for measuring blood pressure during a slow decompression process after stopping pressurization, and a pressurization rate measurement for measuring the pressurization speed immediately after the start of pressurization. means for comparing the measured pressurization rate with a reference value;
and a notification means that operates when the pressurization speed is smaller than the reference value, and when the pressurization speed is smaller than the reference value,
An electronic blood pressure monitor characterized in that the rapid pressure reduction means is operated.