JPS63189128A - Electronic hemomanometer - 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 (a) Industrial Application Field This invention is a method for measuring blood pressure, in which the cuff is determined whether the condition is appropriate or not before the cuff is pressurized and the artery is ischemized. relates to an electronic blood pressure monitor that measures blood pressure only when conditions are appropriate.

(B) Prior Art Conventionally, when measuring blood pressure, a cuff (a belt-shaped rubber air bag called a cuff) is wrapped around the upper arm and fixed, and the cuff is pressurized with a pressure pump to stanch the brachial artery. For example, in the case of the sound method, the generation of a sound (Korotkoff sound) is detected while performing slow evacuation at a rate of about 2 to 3 mg/sec, and the cuff pressure at the time of the sound generation is determined as the systolic blood pressure (SY
S), the cuff pressure at the time the K sound disappears is determined as the diastolic blood pressure (DIA).

(c) Problems to be solved by the invention When measuring blood pressure, the cuff is wrapped around the upper arm and fixed, but whether the cuff is wrapped properly or not can have a large effect on the blood pressure measurement results. Are known. The reason for this is thought to be that, for example, there is a large difference in the amount of air that enters the cuff air bag when the cuff is wrapped too strongly and when it is too weak.

By the way, in order to obtain accurate blood pressure results, for example, when pressurizing a cuff wrapped around the upper arm, the pressure distribution of the cuff must be spread over the upper arm, that is, over the entire width of the cuff, as shown in Figure 5. The cuff must be wrapped to provide even pressure distribution.

However, conventional blood pressure monitors do not have a function to determine whether the cuff is properly attached. For this reason, the degree of cuff wrapping varies each time a measurement is made, as the measurer who is not familiar with the proper cuff wrapping conditions wraps the cuff appropriately during measurement.
This had the disadvantage of causing errors in the measurement results. For example, as shown in Figure 4, if the cuff is wrapped too loosely, a uniform pressure distribution will not be obtained over the entire width of the cuff, and if blood pressure is measured in this state, the appropriate pressure will not be obtained. There was a large difference in the results measured under the distribution, and there was a drawback that accurate blood pressure values could not be obtained.

This invention enables the measurement of blood pressure to be performed immediately after cuff pressure is applied (,
The purpose of the present invention is to provide an electronic sphygmomanometer that determines the appropriateness of the cuff-wrapping condition (fitting condition) and performs blood pressure measurement only when the cuff-wrapping condition is appropriate.

/ (d) Means and action for solving the problem In order to achieve this object, the electronic blood pressure monitor of the present invention has the following configuration.

The electronic blood pressure monitor includes a cuff that compresses an artery, a pressurizing means that pressurizes the cuff, and a cuff pressure detection means that detects the cuff pressure.
a determining means for comparing the cuff pressure data outputted by the cuff pressure detection means with a preset cuff pressure reference predetermined value for determining proper cuff wrapping, and determining whether or not the cuff wrapping is appropriate;
The device also includes a notification device for notifying that the state of cuff wrapping is not appropriate in accordance with the judgment output of the judgment device.

In an electronic sphygmomanometer having such a configuration, a predetermined cuff pressure reference value is set in advance for proper cuff wrapping. This cuff pressure reference predetermined value is determined based on experimental values. For example, when pressurizing with the cuff properly wrapped, the time required for the cuff pressure to reach 2Qn+Hg after the start of pressurization is about 2 seconds, and from 20m1+Hg to 50mH
The setting is based on experimental data showing that the time required to reach g is approximately 0.7 seconds. In other words, this electronic sphygmomanometer is based on the premise that, depending on the state of cuff wrapping, the cuff pressure curve (cuff pressure curve) will vary after the start of cuff pressurization.

Now, the measurer arbitrarily wraps the cuff around the upper arm, fixes the wrapping, and then drives the pressure pump to pressurize the cuff. Then, in the pressurization stage, the cuff pressure is detected at regular sampling times, and the detected cuff pressure is compared with the reference predetermined value. For example, if it is determined that the time required for the cuff pressure to reach 20 mHg and 50 nHg after the start of cuff pressurization is within the range of the standard predetermined values, it is determined that the cuff wrapping is correct. Continue pressurizing and move on to blood pressure measurement. However, if the cuff pressure curve, that is, how the cuff pressure rises after the start of inflation, is extremely slow compared to the standard predetermined value (cuff wrapping is too loose), or if it is extremely slow compared to the standard value. If the cuff is wrapped too quickly (the cuff is too tightly wrapped), the cuff is considered to be in an inappropriate state, and the cuff pressurization is stopped, and a message is displayed indicating that the cuff is not in an appropriate state. Display on the container. In this way, blood pressure measurement is performed only under conditions where the cuff is always properly wrapped, and measurement errors caused by errors in cuff wrapping are eliminated.

(E) Embodiment FIG. 2 is a block diagram showing a specific example of the circuit configuration of the electronic blood pressure monitor according to the present invention.

The cuff pressure is connected to the instrument body via an air tube 15, and the cuff 1, slow exhaust valve 6, rapid exhaust valve 7, and pressurizing pump 2 constitute an air system.

The pressurizing pump 2 is activated by the CPU (central processing unit) 4 when the pressurizing start switch 14 is turned on.
The cuff pressure is increased until the artery is ischemized.

The slow evacuation valve 6 is a small hole opened at a suitable location in the air tube 15, and causes the cuff pressure to be emitted at a slow speed of about 2 to 3 mHg/sec. The pressure sensor 3 detects cuff pressure at every sampling time (for example, 0.1 seconds), and
Output to 8. Then, the A/D converter 9 transmits the cuff pressure data (analog amount) amplified by the amplifier 8 to the CPU 4.
converts it into a digital value that is easy to process, and this digital value is
Taken into PU4. In addition, a sound sensor (microphone) 16 is installed at the cuff pressure, and detects the sound (Korotkoff sound) generated during the slow evacuation stage, and the amplifier 10
The K sound information is output to the CPU 4 via the CPU 4.

The CPU 4 has a function of taking in cuff pressure data and sound information output from the pressure sensor 3 and the sound sensor 16 and storing them in the memory 11, while determining the systolic blood pressure value and the diastolic blood pressure value.

In addition, in the CPU 4, appropriate cuff wrapping based on preset experimental values is determined based on the cuff pressure standard predetermined value and the pressure sensor 3.
It has a function of comparing the cuff pressure data outputted from the cuff pressure data and determining whether the cuff pressure data is within the range of a predetermined cuff pressure reference value. This cuff pressure reference predetermined value is, for example, the third cuff pressure reference predetermined value.
As shown in the C curve shown in the figure, if the condition of the Café winding is appropriate, the force and voltage will be 20 mm after the Caffe winding starts.
The time it takes to reach g is about 1.6 seconds, and the time it takes to go from 20wHg to 50DHg is:
This is based on an experimental value of approximately 1″' seconds.

The A curve shown in Figure 3 indicates that the cuff wrapping is too strong than the appropriate standard, that is, the rise of the cuff pressure curve is rapid, and the cuff pressure curve reaches 50 m in about 0.6 seconds after the start of pressure application.
Curve 8 shows the case where the cuff pressure curve is too loose than the appropriate standard, that is, the rise of the cuff pressure curve is too slow, and the cuff pressure reaches 50 mHg approximately 5.7 seconds after the start of pressurization. Indicates when to do so. In the case of curves A and 8, they deviate greatly from the reference predetermined value (curve C).

In this case, the CPU 4 has a function of determining that the state of the cuff wrapping is incorrect and displaying this on the display 5.

Based on the determination result information of the CPU 4, the display 5 displays on a liquid crystal display a cuff wrapping condition correction command such as "Please loosen the cuff wrapping a little" or "Please tighten the cuff wrapping a little." Furthermore, when it is determined that the cuff pressure data deviates from a reference predetermined value, the buzzer 12 sounds a buzzer indicating that blood pressure measurement will not be performed in this state. Based on the sound of the buzzer 12 and the display on the display 5, the operator corrects the cuff wrapping condition.

FIG. 1 is a flowchart showing specific processing operations of the electronic blood pressure monitor according to the embodiment.

When the measurer turns on the power switch 13 after wrapping the caffe around his upper arm, for example, the instrument is initialized [step (hereinafter referred to as ST) 1], and it is determined whether the pressurization start switch 14 is turned on or not. (Sr2). When the pressurization start switch 14 is turned on, the pressurization pump is driven and the cafe is pressurized (Sr3). At the same time, a timer for detecting the sampling time of cuff pressure data is activated (5T4), and the voltage (Vbt) of the pressurizing pump 2 and the cuff pressure P are detected at each sampling time (Sr6 and 5T7).

In the embodiment, the voltage of the pressure pump 2 (Vbt
) is detected. Since the pressurizing speed of the pressurizing pump 2 changes depending on the voltage, the pressure curve depending on the winding of the cafe is as follows.
This can be determined by reading the voltage of the pressure pump 2.

In other words, in the embodiment, the cuff pressure curve is determined by taking into account changes in the voltage of the pressurizing pump 2.

In Sr1, it is determined whether the cuff pressure has reached 20 mmHg. The above process is repeated until the cuff pressure reaches 20mHg, and when the cuff pressure reaches 20mHg, the judgment of Sr1 becomes YES and the cuff pressure reaches 20mmHg.
The time (T2O) and the voltage (Vbt20) of the pressurizing pump 2 at that time are stored in the memory 11 (
Sr9).

At 5TIO, it is determined whether the cuff pressure has reached 5Qnf1g. Now, if the cuff pressure exceeds 5QnHg, the judgment of this 5TIO becomes YES, and the cuff pressure exceeds 5QnHg.
Store the time (T2O) and the voltage (Vbt50) of the pressure pump 2 at the time when the voltage exceeds 0wHg in the memory 11 (ST
II). Then, the CPU 4 calculates a cuff pressure curve based on this cuff pressure data and the voltage data of the pressurizing pump 2, that is, by calculating the time required for the cuff pressure to reach a constant pressure (20 to 50 Hg). (ST12) Furthermore, the CPU 4 compares this cuff pressure curve (cuff pressure rising state) with a predetermined cuff pressure reference value. For example, if the cuff pressure rise time is slower than the reference predetermined value (predetermined range) (see curve B in Figure 3), it is determined that the cuff wrapping is too loose, and the cuff pressure rise time is determined to be too loose. is faster than (a predetermined range of) a reference predetermined value (see curve A in FIG. 3), it is determined that the cafe winding is too strong. vice versa,
If the cuff pressure data is within the predetermined range of the reference predetermined value, it is assumed that the cuff wrapping is correct, the determination in 5T13 is YES, and the process shifts to normal blood pressure measurement (ST14).
).

However, in the case of the above curve or the 8 curve, the judgment of 5T13 becomes NO, the buzzer 12 sounds, and the display 5 displays an "error display", that is, "The cuff wrapping is slightly loosened." A liquid crystal display such as "Please tighten the cuff" or "Please wrap the cuff a little tighter" is displayed (ST15).

After this, the drive of the pressurizing pump 2 is stopped (STI6),
The rapid exhaust valve 7 is opened and the pressure in the cafe is reduced (ST1
7). This allows the person performing the measurement to know whether or not the wrapping of the cafe is appropriate before the arterial ischemia is established. Therefore, proper winding is performed after correcting the state, and there is no need to perform blood pressure measurement while the winding is in the wrong state, and an appropriate blood pressure value can always be obtained.

In the example, the pressure was kept constant (20wHg and 50**
Hg) and calculates the time required to reach the set constant pressure to determine whether the cuff wrapping is appropriate or not. However, the present invention is not limited to this. Of course, a method may also be used in which the time is set constant and the pressurization effect within the constant time is calculated.

(F) Effects of the Invention In this invention, as described above, the degree of cuff pressure is detected, the degree of cuff pressure is compared with the predetermined cuff pressure reference value, and the cuff pressure data is detected to be outside the predetermined range of the predetermined reference value. In this case, since the correction of the cuff wrapping is notified, it is possible to avoid performing blood pressure measurement while the cuff is incorrectly wrapped, and accurate blood pressure measurement can be performed at all times.

Moreover, with this invention, it is determined whether or not the cuff is properly wrapped a few seconds after the start of cuff pressure, and if it is not, cuff pressure is stopped. This invention not only eliminates the inconvenience of having to re-isolate the artery and re-measuring the blood after a measurement result is obtained, but also eliminates the disadvantage of suffocating the upper arm by quickly stopping cuff pressure. It achieves its purpose and has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing the processing operation of the electronic blood pressure monitor of the embodiment, Fig. 2 is a block diagram showing an example of the circuit configuration of the electronic blood pressure monitor of the embodiment, and Fig. 3 shows the cuff pressure when the cuff is pressurized. FIG. 4, an explanatory diagram showing the curve, is a diagram when the cuff is wrapped too loosely. 1: Cuff, 2: Pressure pump, 3: Pressure sensor, 4: CPU. 11: Memory. Patent applicant Tateishi Electric Co., Ltd. (and 1 others)
Name) Agent: Patent Attorney Shigeru Nakamura J131!
IB! ) FJI t l5ec+ Figure 4 Heijo εNeho Masaya) (Spontaneous) ■, Small case display 1988 Patent IQJI No. 23260 2, Title of invention Electronic blood pressure monitor 3, Relationship with the amended person case Patent application Address: 10 Hanazono Tsuchido-cho, Ukyo-ku, Kyoto City Name (
29/I) Tateishi Electric Co., Ltd. Representative Yoshi Tateishi J1T (1 other person) 4. Agent 8604 Address 71 Kyoto Sai Building 5F, 3-1 Mibu Kayo Gosho-cho, Nakagyo-ku, Kyoto City Spontaneous supplement 1 7. Contents of amendment ( 1) Details 1! The "Scope of Claims" column in Section 3.1 is amended as shown in the attached sheet. (2) In the 17th line of the 2nd page of the specification, the phrase ``exact J'' is corrected to ``exact J.'' (3) In the 11th line of the 3rd page of the specification, ``exact J'' is corrected. Correct the statement to be "accurate." (4) From the 1st line to the 2nd line of page 10 of the specification, ``When reached J'' is corrected to ``Until reached.'' (5) In the 8th line of the 10th page of the specification, [Judgment is YES]
``The result is S,'' is changed to ``The judgment is No, and it is corrected to J.'' (6) In the 15th line of the 12th page of the specification, ``Accurate''
(7) Figures 1 and 2 of the drawings are amended as attached. 8. List of attached documents (1) One document stating the scope of claims. (2) Corrected drawings [Figures 1 and 2] 1 copy 2, Claims (1) Cuff that compresses an artery, pressurizing means that pressurizes this cuff, and cuff pressure detection that detects cuff pressure The cuff pressure data outputted by the means ll1Ccuff!-1...■2 is provided with a notification means for notifying that the cuff wrapping is not appropriate when the cuff pressure data is set in advance. An electronic blood pressure monitor characterized by: Patent applicant: Tateishi Electric Co., Ltd.
%)

Claims (1)

[Claims] (1) A cuff that compresses an artery, a pressurizing means that pressurizes the cuff, a cuff pressure detecting means that detects the cuff pressure, and a preset appropriate cuff pressure data output from the cuff pressure detecting means. Compare with the cuff pressure standard prescribed value when wrapping the cuff,
An electronic blood pressure monitor comprising a determining means for determining whether the cuff is wrapped properly, and a notifying means for notifying that the cuff is not properly wrapped according to the determination output of the determining means.