JPH0143047Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention This invention relates to a non-invasive blood pressure measuring device, and particularly to a blood pressure measuring device characterized by processing when insufficient pressurization is detected.

(b) Prior art and its problems Generally, in non-invasive blood pressure measurement, the cuff pressure is increased with a manual pump or an automatic pressurization pump until the artery is completely occluded, and then the pressure is gradually reduced. The intraarterial pressure overcomes the cuff pressure and blood begins to flow, producing a Korotkoff sound.The cuff pressure at which this Korotkoff sound appears is defined as the systolic blood pressure, and the cuff pressure at which the Korotkoff sound disappears due to a decrease in cuff pressure is defined as the systolic blood pressure. Cuff pressure is defined as diastolic blood pressure. Many of the automatic blood pressure measurement devices that have been put into practical use in recent years are
The occurrence and disappearance of the Korotkoff sounds are automatically determined to determine the systolic blood pressure and the diastolic blood pressure.

By the way, when measuring blood pressure, the initial cuff pressure, that is, the initial pressure, is not uniquely determined due to individual differences among the subjects. The person taking the measurement needs to increase the initial pressure to a level slightly higher than the systolic blood pressure (20 to 30 mmHg), but as mentioned above, the initial pressure is not uniquely determined, so the pressure may not be sufficient in some cases. be. In this case, due to insufficient pressurization, Korotkoff sounds may occur due to the initial pressure, and there is a risk that the initial pressure may be mistaken for the systolic blood pressure. In order to avoid this fear, some conventional blood pressure measuring devices issue an abnormality notification as insufficient pressurization when Korotkoff sounds are detected within a certain period of time from the start of measurement. If such an abnormality is reported due to insufficient pressurization, it may be necessary to increase the initial pressure a little more and perform measurements as a countermeasure. However, if you simply repressurize, even if you repressurize, insufficient pressurization still occurs, or if there are vibrations, noises, etc. in the surrounding measurement environment, it will be determined that there is insufficient pressurization continuously, and the measurement time will increase. If it gets too long, blood may become congested, making it impossible to take accurate measurements.
There were problems such as cuff pressure being increased to nearly 300mmHg.

(c) Purpose of the invention The purpose of this invention is to eliminate the drawbacks of the conventional devices described above, to provide a blood pressure measuring device that can perform appropriate processing depending on the situation when insufficient pressurization is detected, and can measure blood pressure safely and accurately. be.

(d) Structure and effect of the device While considering a blood pressure measuring device that could achieve the above purpose, the inventors of this application devised a method to lower the cuff pressure by evacuating the cuff once as a process when insufficient pressurization was detected. After that, restart the measurement after a while. As soon as insufficient pressure is detected, pressurize slightly higher than the previous time and continue measurement. There are two methods, but if blood pressure occurs, accurate blood pressure measurement cannot be expected.
I realized that the above can be selected based on the pressure applied to the cuff. This invention was devised by focusing on this point, and the blood pressure measuring device of this invention supplies pressurized air to the cuff by a pressurizing means, detects this pressure by a cuff pressure detecting means, and Blood pressure is measured by exhausting pressurized air at a very low speed with an exhaust valve, and during this measurement, insufficient pressurization of the cuff is detected by an insufficient pressurization detection means, wherein the insufficient pressurization detection means detects insufficient pressurization of the cuff. When detected,
determining means for determining whether or not the cuff pressure detected by the cuff pressure detection means exceeds a preset value; and when the determining means determines that the cuff pressure exceeds the set value; rapid opening instruction means for instructing rapid opening of the exhaust valve; and repressurization instruction means for instructing the pressurization means to repressurize when the discrimination means determines that the cuff pressure does not exceed a set value. It is characteristically equipped with the following.

According to the blood pressure measuring device of this invention, when insufficient pressurization is detected, the indicating means, for example, a display, instructs the measurer whether to quickly open the exhaust valve or re-pressurize, depending on the cuff pressure at that time. Therefore, the measurer follows the instructions and when the cuff pressure becomes high, the exhaust valve is opened rapidly, so that the cuff pressure is not pressurized for a long period of time and blood congestion, etc. occurs. Since blood pressure measurements can be avoided, accurate blood pressure measurements can be performed. Furthermore, it is possible to avoid an extremely large increase in cuff pressure due to repeated re-inflation. In addition, if the cuff pressure is low, the cuff pressure is re-inflated according to the instructions, so there is no need to worry about over-inflation, and rapid measurements can be made.

(E) Description of Embodiments This invention will be explained in more detail below with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram showing the configuration of an electronic blood pressure monitor which is an embodiment of this invention. In the same figure, the pressurizing system 1 includes a rubber tube arm cuff 2 and this arm cuff 2.
It is composed of an exhaust valve 3 and a pressurized rubber bulb 4, which are connected in communication with each other. A pressurizing system 1 is installed inside the exhaust valve 3.
There is an exhaust hole that naturally exhausts the inside in small amounts.
During blood pressure measurement, the pressure inside the pressurizing system 1 is gradually reduced by this natural exhaust. The pressure in the pressurizing system 1 is detected by a semiconductor pressure sensor 5, and the output of the semiconductor pressure sensor 5 is converted into a digital signal by an A/D converter 6 and input to a microcomputer 7. In addition, a Korotkoff sound sensor 8 is disposed near the cuff 2 of the pressurization system 1 or inside the cuff 2, and the blood pressure signal output from the Korotkoff sound sensor 8 is amplified by an amplifier 9 and input to the microcomputer 7. has been done.

The microcomputer 7 is composed of a CPU (central processing unit), memory such as RAM and ROM, I/O ports, etc., and receives signals from the above-mentioned sensors 5 and 8 and operates according to the program stored in the ROM. , executes a control operation for calculating the systolic blood pressure value and the diastolic blood pressure value. The calculated systolic blood pressure value and diastolic blood pressure value are displayed on the display 10, and the buzzer 1 is activated when the Korotkoff sound is detected or for other purposes.
1 is activated and begins to emit sound.

FIG. 2 shows a concrete diagram of the display 10, including blood pressure display sections 101 and 102 that digitally display the systolic blood pressure value and diastolic blood pressure value, a downward arrow-shaped display section 103 that gives "exhaust instructions" to the measurer, and " It is provided with an upward arrow-shaped display section 104 for instructing pressurization, and an OK display section 105 for indicating completion of measurement preparation.

Although not shown, a display section 10 for displaying exhaust instructions
Related to 3: ``Please vent the air.'' ``Are you still moving your arms?'' ``Make sure there is no noise.''
Please re-measure” etc. is displayed on display 1 of the re-pressurization instruction.
Regarding item 04, a message such as ``please pressurize the blood pressure monitor'' is added to the case of each electronic blood pressure monitor.

FIG. 3 is a process flow diagram of the embodiment electronic blood pressure monitor shown in FIG. Next, the operation of the electronic blood pressure monitor of the above embodiment will be explained with reference to this process flow diagram.

When the power is turned on and operation starts, first
Initialize the RAM and I/O ports [Step ST (hereinafter abbreviated as ST) 1], and then read the current cuff pressure in response to the measurement person's pressurization with the pressurizing rubber bulb 4 and display it on the display. 10 (ST2) and confirm the pressurization (ST3).If the pressurization is not performed in ST3, the process returns to ST2 and waits until the pressurization is applied.However, if the pressurization is applied in ST3, the subsequent pressurization is not performed. The pressure stop is detected (ST4), the measurement starts (ST5), and the microcomputer 7
Set the built-in timer to 1 second (ST6). Next, the presence or absence of the Korotkoff sound is checked, and if there is no Korotkoff sound, this check is repeated until it is present (ST7). If the Korotkoff sound is detected here, it is further determined whether or not the timer has timed up (ST8). If the timer had not timed up, the Korotkoff sound would have occurred within 1 second after the transition to measurement, which would mean insufficient pressurization.
The process moves on to ST11 and subsequent steps.

If the timer has timed up in ST8, there is no insufficient pressurization, so proceed to ST9, determine the systolic blood pressure from the cuff pressure when the first Korotkoff sound is detected, display it on the display 10, and further eliminate the Korotkoff sound in ST10. The diastolic blood pressure is determined from the cuff pressure at that time and is similarly displayed on the display 10, and the measurement is completed.

If the timer has not timed up in ST8,
That is, in the case of insufficient pressurization, the process moves to ST11 and the cuff pressure _P1 at that time is read. Next is ST12
The cuff pressure P ₁ is compared with a set value 200 stored in advance. This set value 200 is a cuff pressure reference value for selecting whether to further pressurize the cuff when insufficient pressurization is detected, or to temporarily evacuate and perform a remeasurement.
This value can be set arbitrarily, but in this example it is set to 200.
This means that the systolic blood pressure is generally 200 mm.
Hg or less, and if it exceeds 200 mmHg and insufficient pressurization occurs, it is considered to be due to the influence of noise. When pressurizing to 200 mmHg, it is considered that a considerable amount of time has passed due to pressurization and re-pressurization, and if measurements are continued, undesirable conditions such as blood congestion may occur. This is due to the following reasons.

Now, as a result of comparison in ST12, the cuff pressure P ₁ is
If it is smaller than 200, it is assumed that the cuff pressure is not so high, and the re-inflation instruction display section 104 is lit up to instruct the measurer to re-inflate (ST13). When the measurer sees this pressurization instruction and pressurizes again,
The flow returns to ST2, and the same processing as described above is repeated thereafter.

If the cuff pressure P ₁ exceeds 200 in ST12, it can be said that the cuff pressure is still high at this point, so the exhaust display section 103 is lit to instruct the measuring person to exhaust the air (ST14), and the temporary measurement is stopped. Stop (ST15). Upon seeing the display of this exhaust instruction, the measurer quickly opens the exhaust valve 3. When sufficient evacuation is performed and repressurization for the next measurement is OK (ST16), the OK display section 105 is lit to indicate that preparation is complete (ST17), and the process returns to ST2 for the next re-measurement. Move to.

In the above embodiment, the display section 103 instructs to open the exhaust valve and the display section 1 instructs to repressurize the exhaust valve.
04 is displayed with continuous lighting, but it may be displayed with blinking lighting.

Further, in the above embodiment, the display section 103 and the display section 104 use a special display pattern in the shape of a downward arrow or an upward arrow, but in this invention, a display device with such a special display pattern is used. For example, if the systolic blood pressure and diastolic blood pressure are displayed using a segment type display, the instruction to open the exhaust valve or the instruction to repressurize may be displayed in a display format other than numbers ( For example, it may be displayed as 〓〓〓).

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of an electronic blood pressure monitor that is an embodiment of this invention, Figure 2 is a diagram specifically showing the display of the electronic blood pressure monitor, and Figure 3 is the processing of the electronic blood pressure monitor. It is a flow diagram. 1: Pressure system, 2: Bracelet, 3: Exhaust valve, 4: Pressurized rubber bulb, 5: Semiconductor pressure sensor, 7: Microcomputer, 8: Korotkoff sound sensor, 10: Display, 103: Exhaust instruction display Section 104: Re-pressurization instruction display section.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Pressurized air is supplied to the cuff by a pressurizing means, this pressure is detected by a cuff pressure detecting means, and the pressurized air is exhausted at a slow speed by an exhaust valve to measure blood pressure. death,
In a blood pressure measuring device that detects insufficient pressurization of the arm cuff during this measurement using an insufficient pressurization detection means, when the insufficient pressurization detection means detects an insufficient pressurization, the cuff pressure detection means detects the insufficient pressurization. a determining means for determining whether or not the cuff pressure exceeds a preset value; and when the determining means determines that the cuff pressure exceeds the set value, instructing the rapid opening of the exhaust valve. It is characterized by comprising: a rapid release instruction means; and a re-pressurization instruction means for instructing re-inflation by the pressurizing means when the cuff pressure is determined not to exceed a set value by the discriminating means. blood pressure measuring device. (2) The quick release instructing means and the repressurizing instructing means are indicators, the scope of the first utility model registration claim.
Blood pressure measuring device as described in section. (3) The blood pressure measuring device according to claim 2, wherein the display pattern for instructing rapid opening of the display device is in the shape of a downward arrow, and the display pattern for instructing re-pressurization is in the shape of an upward arrow. (4) The downward arrow display pattern and the upward arrow shape display pattern of the display device are displayed in a blinking manner.Claim 3 of the Utility Model Registration
Blood pressure measuring device as described in section.