JPS6284738A - Digital 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) Field of Industrial Application This invention relates to an electronic finger blood pressure monitor, and particularly to an electronic finger blood pressure monitor that is designed to prevent cuff breakage.

(B) Prior Art The inventor of this application compresses a finger with a daily cuff, and uses a pulse wave sensor attached to the finger cuff to detect changes in arterial volume caused by the finger pressure. An electronic finger sphygmomanometer that detects the pressure inside the cuff with a pressure sensor and determines the blood pressure value based on the pulse wave and cuff pressure obtained during the cuff pressure reduction process has already been created and a patent application has been filed. Gansho 60-786
No. 51).

The finger cuff used in this electronic finger blood pressure monitor is shaped like a thin rubber bag that surrounds the periphery of the finger.If you apply pressure without inserting your finger into such a finger cuff, the cuff will close. Since the capacity of the finger cuff is smaller than that of a finger cuff that is wrapped around the upper arm, the finger cuff quickly inflates, causing the finger cuff to swell with the slightest amount of pressure, causing the cuff to break.

In order to prevent this cuff from breaking, a detection means such as a microswitch that detects the insertion of a finger is provided close to the cuff, and the microswitch mechanically detects the operation, that is, the insertion of a finger. , I was trying to start pressurizing.

(c) Problems to be solved by the invention Although the above-mentioned mechanical finger insertion detector can prevent the destruction of the cuff bag to some extent, the finger insertion detector itself is of a mechanical type such as a micro switch. , it is structurally complex and the mechanism itself is easily damaged. Moreover, since it is necessary to specially provide such a mechanism, there is a problem that the meter becomes expensive.

In view of the above, the present invention prevents the cuff from being abnormally pressurized by prohibiting the cuff from being pressurized when the finger is pressurized without being inserted, without providing any special additional mechanical means. An object of the present invention is to provide an electronic finger blood pressure monitor that can prevent the cuff from being destroyed.

(d) Means for Solving the Problems As shown in the outline in FIG. means 2, and pressure reducing means 3 for reducing the pressure of the cuff.
, a pulse wave sensor 4 that is attached to the cuff and detects the pulse wave from the finger, a pressure sensor 5 that detects the pressure of the cuff, and a pulse wave detected by the pulse wave sensor and a cuff pressure detected by the pressure sensor. a blood pressure determination means 6 for determining blood pressure based on the above, and a clock means 7 for measuring a predetermined time after the pressurization means starts pressurization; The system includes a determining means 8 for determining whether or not the cuff pressure has been reached, and a control means 9 for operating a pressure reducing means when the determining means determines that the cuff pressure is below a predetermined value.

(E) Function In this electronic finger blood pressure monitor, at the start of measurement, the pressurizing means is activated to pressurize the cuff. As the cuff is pressurized, the output of the pressure sensor gradually increases. Since this cuff itself has a small capacity, the time it takes for the pressure to rise from pressurization to a certain pressure value is almost the same, and the time to reach the predetermined value is different when a finger is inserted and when a finger is not inserted. do.

Therefore, if the timer measures the elapse of a predetermined time after the start of pressurization, and it is determined that the cuff pressure has not reached a predetermined value after the elapse of this predetermined time, in this case, if the cuff pressure has not reached the predetermined value, in this case, If the cuff is not inserted or the cuff is damaged, immediately activate the pressure reduction means to exhaust the cuff pressure. However, if the cuff pressure reaches a predetermined value or higher after a predetermined period of time has elapsed, it means that the finger was pressurized while it was inserted, and in this case, normal blood pressure measurement processing will begin. .

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

FIG. 2 is an external perspective view of an electronic finger sphygmomanometer in which the present invention is implemented. has been done.

On the case surface of the main body 11, there are a display 14 that displays systolic blood pressure, diastolic blood pressure, pulse rate, etc., a pressurization value setting device 15 for selecting a pressurization setting value, a clear key 16, and a start key 1.
7. A power key 18 is provided.

Further, a cuff rubber bag 19 having a cylindrical outer shape is stored in the case of the cuff storage portion 12. Although not shown, this cuff rubber bag 19 is provided with a pulse wave sensor for detecting finger pulse waves, and an electric signal line connecting this pulse wave sensor and the main body 11 and a cuff rubber bag 19 and the main body are provided. 11 are bundled together and connected as a cord wire 13 between the two.

FIG. 3 shows a circuit block diagram of the electronic finger blood pressure monitor. In the figure, a pressurization value setting switch 15a, a clear switch 16a, a start switch 17a, and a power switch 18a correspond to the pressurization value setting device 15, clear key 16, start key 17, and power key 18, respectively.
It is designed to turn on when these keys are operated. The on/off signals and setting signals for each of these switches are C
It is designed to be input to PU20.

The motor drive circuit 21 receives instructions from the CPU 20.
The motor 22 of the pressurizing pump is turned on/off. By starting the motor 22, the cuff rubber bag 19 is pressurized.

Further, the rapid exhaust valve drive circuit 12 is configured to control opening and closing of the valve 24 based on commands from the CPU 20.

By driving the motor 22, air pressure is supplied to the cuff rubber bag 19 via the air tank 25, and the pressure in the cuff rubber bag 19 is converted into an electrical signal by the semiconductor pressure sensor 26, and then A/D converted via the amplifier circuit 27. The digital signal is converted into a digital signal by the device 28 and then taken into the CPU 20.

Furthermore, the LED drive circuit 29 drives a light emitting element 30 attached to the cuff rubber bag 19 according to a command from the CPU 20.
On the other hand, the signal received by the light receiving element 31 is sent to the A/D converter 28 via the filter 32 and the amplifier circuit 33.
The data is digitally converted and then taken into the CPU 20. Light emitting element 30 and light receiving element 31
A pulse wave sensor is configured.

Display data from the CPU 20 is displayed on a display (LCD) 14 via an LCD drive circuit 34. Further, a buzzer 36 is driven by a command from the CPU 20 via a buzzer drive circuit 35. Note that 37 is a slow exhaust valve.

The CPU 20 executes various functions according to the programs in the flowcharts described later, and each of the above-mentioned component circuits
Under the control of 20, blood pressure measurement operation is executed.

Next, the functions of the CPU 20 and the operation of the digital finger blood pressure monitor will be explained with reference to the flowcharts shown in FIGS. 4, 5, and 6.

<Overall Operation> First, the overall operation of the finger electronic blood pressure monitor will be described with reference to the flowchart in FIG.

When the power switch 18a is turned on, operation starts,
All display patterns on the display (LCD) 14 are displayed [step ST (hereinafter referred to as ST) 1], and then the display 1
All display patterns No. 4 are turned off, and it is checked whether the display 14 is operating normally (Sr2). continue,
A ready mark (9) is displayed on the display 14 (Sr
1). The measurer who sees this preparation completion mark knows that the measurement preparation completion state has been reached, inserts a finger, for example, the index finger of the left hand, into the cuff rubber bag 19 and turns on the start switch 17a. By turning on this start switch 17a, S
The determination in r1 becomes YES, and then the ready mark is turned off (Sr5). Then move on to pressure treatment (Sr6)
.

This pressurization process is a series of processes in which the cuff rubber bag 19 is first pressurized to the set value set by the pressurization value setter 15, then the pressurization is stopped, and the process moves to slow evacuation. The pressure treatment is characteristic, and this treatment will be described in more detail later.

Following the pressurization process, the measurement process begins, where the systolic blood pressure is determined (Sr7), the average blood pressure is further determined (Sr8), the diastolic blood pressure is calculated from the determined systolic blood pressure and average blood pressure (Sr1), and then the systolic blood pressure is determined (Sr8). The pulse rate is calculated (STIO
). There are various algorithms for calculating systolic blood pressure, mean blood pressure, and diastolic blood pressure. For example, systolic blood pressure is the cuff pressure value at the time when the pulse wave detected by the pulse wave sensor exceeds a predetermined level, and The cuff pressure at the maximum value of the wave amplitude is taken as the average blood pressure, and the diastolic blood pressure is calculated from these systolic blood pressure and mean blood pressure. However, in this invention, since blood pressure determination is not an important part, a description thereof will be omitted.

Of course, these systolic blood pressure, diastolic blood pressure, average blood pressure, and pulse rate are displayed on the display 14.

When the measurement is completed, the motor 22 is turned off (STll).
, the valve 24 is opened (ST12), the pressure in the cuff rubber bag 19 is rapidly exhausted, and when the current cuff pressure becomes 20 mmHg or less (ST13), the light emitting element 30 stops emitting light.
T14), the process returns to Sr1 and waits for the next measurement.

Pressurizing Process> Next, details of the pressurizing process in ST6 will be described with reference to the flowchart in FIG. 5.

When the operation starts to pressurize Sr6, the auto power-off timer is reset at 5T21. This auto power off timer is a 5 minute timer, and when this timer times out, the power is automatically turned off. Therefore, when this auto power off timer is reset, the auto power off timer will start counting time again from 0, and the power will be turned off 5 minutes after this point.

Subsequently, the light emitting element 30 is turned on by a command from the CPU 20 (Sr22), and then the Cuff-T (register)
The output of the pressurization value setter 15 is stored in (Sr23).

This pressurization value setting device 15 has a measured value of 140.170.20.
Since the cuff pressure is switchable to four levels of 0.240 mmHg, the cuff pressure corresponding to the set value is stored in Cuff-T.

Also, the valve 24 is closed (Sr24), and then 20
After a time of 0 milliseconds (Sr25), the motor 22 is turned on (Sr26). The reason why the time of 200 milliseconds is set here is to wait for the pulp 24 to stabilize. When the motor 22 is turned on at 5T26, the pump is driven and pressurization of the cuff rubber bag 19 via the air tank 25 is started. And counter S. The value obtained by dividing the value stored in Cuff-T by 8 and subtracting 5 from it, that is, the value of Cuff-T s, ---5 is stored (Sr27). For example, when the pressurization value setter 15 is set to 140a+mHg, 18-5=1
3 will be stored in 80. -Next, it is determined whether the clear switch 16a is turned on (Sr28).

Normally, this clear switch 16a is not turned on, so the determination is N.

Then, it is determined whether Cuff-P z Cuff-T (Sr29), that is, it is determined whether the current cuff pressure of Cuff-P is greater than the pressurization setting value of Cuff-T. During pressurization, this determination is No, and then it is determined whether or not timer T-1 is 0 (Sr30).
. This timer T-1 is normally set to 0 at the beginning, and when the determination is YES, the timer T-1 is set to 0.
0 milliseconds is set (Sr31>. At this point -
The current pressure is displayed on the diastolic blood pressure display section of the display 14 (S
r32). Then, 1 is subtracted from the counter S0 (Sr
33). If 5T27 and 5o=13, then 5O=12. Subsequently, it is determined whether the counter S0 is O or not (Sr
34) In one example, 12 is stored in the counter S0, so at this point the determination is NO, and 5T28 is again
The process returns to 5T28 to 5T34 until the counter 50 becomes 0, that is, 12 times. The fact that the processing from 5T28 to 5T34 is repeated 12 times means that a timer time of 200 milliseconds is set each time, so 2.4 seconds is counted here. This 2.4 seconds means the time it takes for the pressurization value setter 15 to normally reach a predetermined pressure, which is 3.2 seconds when the set value is 170 mmHg, 4.0 seconds when the set value is 200 V++Hg, and 2.4 seconds when the set value is 170 mmHg.
At 401Hg, the time is 5.0 seconds. Of course, this time varies depending on the capacity of the air tank 25, the pumping speed, etc., but it is set in this manner in this embodiment.

If the current pressure Cuff-P is still smaller than the set pressure Cuff-T, that is, 140 mmHg even after the above time has elapsed, for example, 2.4 seconds when the pressurization setting value is 140 mmt1gO, that is, if the current pressure Cuff-P is still smaller than the set pressure Cuff-T, that is, 140 mmHg, that is, 50-0 at 5T34. If the determination is YES, this means that the current pressure Cuff-
Indicates that P has not yet reached the set pressure Cuff-T, and in this case, the finger is not inserted into the cuff rubber bag 19 normally, an error message (5T35) is displayed, followed by a beep for 2 seconds. Emitted by buzzer 33 Sr16)
, Sr17 sets the register H1 for pulse wave number detection to O, and moves to the exhaust process after 5T11. In other words, the pressure will not increase further.

Until the judgment of “50=0” becomes YES in 5T34,
In other words, by the time it reaches 2.4 seconds with the pressurization setting value of 14011 mHg, the “Cuff-P≧Cuff” of the judgment of 5T29
-T?” is YES, it indicates that the pressurization is normal, the motor 22 is stopped at 5T38, and the Sr
The process moves to step 7, and from then on, the process moves to blood pressure determination processing.

In addition, in the case of the pressurization process shown in FIG. 0 seconds and 5.0 seconds, but instead, as shown in Fig. 6, at 5T27, the counter S0 is set to a constant value of 12 (a value corresponding to 140a+mHg). is fixed and memorized, and in subsequent processing, when 2.4 seconds have elapsed, it is determined whether the current cuff pressure Cuff-P exceeds the set value 140 mmHg (5T39), and the counter S0 becomes O at 5T34. If the current cuff pressure Cuff-P does not exceed 140 mdg at this point, that is, after 2.4 seconds, 5TII in FIG.
Moving on to the subsequent evacuation process, if the pressure has already exceeded 140 mm + Hg, it is assumed that the pressurization is normal, and the process returns to 5T29, and when the current cuff pressure Cuff-P exceeds the set value Cuff-T, the process moves to 5738. , the process may proceed to normal measurement processing.

(G) Effects of the Invention According to this invention, if the cuff pressure does not reach a predetermined value within a certain period of time after the start of pressurization, the cuff is evacuated without continuing pressurization. If the finger is not inserted, the cuff will not be pressurized any longer, so damage to the cuff caused by excessive pressure when no finger is inserted can be prevented.

Moreover, since it can be realized by software processing of the CPU, there is no need to provide any special mechanism, and it can be realized at low cost.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of the present invention, FIG. 2 is an external perspective view of an electronic finger blood pressure monitor in which the present invention is implemented, and FIG.
The figure is a circuit block diagram of an electronic blood pressure monitor for authorized use, and Figure 4 is:
An overall flowchart for explaining the operation of the electronic blood pressure monitor for equal authority, FIG. 5 is a flowchart showing the pressurization processing routine of the same overall flowchart in further detail, and FIG.
It is a flow chart which shows another example of pressurization processing. 1: Cuff, 2: Pressurizing means, 3: Depressurizing means, 4: Pulse wave sensor, 5: Pressure sensor, 6: Blood pressure determining means, 72 Time measuring means, 8: Judgment means, 9: Control means. Patent applicant Tateishi Electric Co., Ltd. Agent
Patent attorney Shigenobu Nakamura Amendment to Figure 1 procedure (voluntary) 1. Display of the case 1985 Patent Application No. 226473 2 Name of the invention Electronic finger blood pressure monitor 3 Relationship with the case Patent applicant address 10 Hanazono Tsuchido-cho, Ukyo-ku, Kyoto Name (2)
94) Tateishi Electric Co., Ltd. Representative Takao Tateishi 4, Agent [Phase] 600 Address 5 Kakimoto-cho, Gojo-dori Omiya Higashiiri-ru, Shimogyo-ku, Kyoto City, Date of amendment order - Voluntary amendment, -'- 7. Contents of amendment Drawing Figure 2 is corrected as shown in the attached sheet. 8. List of attached documents (11 drawings [Figure 2] 1 or more copies)

Claims (1)

[Claims] (1) A cuff for compressing a finger, a pressurizing means for pressurizing the cuff, a depressurizing means for reducing the pressure of the cuff, and a pulse wave attached to the cuff for detecting a pulse wave from the finger. a wave sensor; a pressure sensor that detects the pressure of the cuff;
A finger electronic sphygmomanometer comprising a blood pressure determining means for determining blood pressure based on a pulse wave detected by the pulse wave sensor and a cuff pressure detected by the pressure sensor, wherein the pressure means starts pressurizing. a timer for measuring the elapse of a predetermined period of time; a determining device for determining whether the cuff pressure has reached a predetermined value when the predetermined time has elapsed; An electronic finger blood pressure monitor comprising a control means for operating a pressure reduction means.