JPS6284739A - 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 The present invention relates to an electronic finger blood pressure monitor, and particularly to an electronic finger blood pressure monitor that can update pressure setting values.

(b) Conventional technology In general, electronic finger blood pressure monitors use a finger cuff to press the finger.
A photoelectric pulse wave sensor attached to this finger cuff detects changes in arterial volume caused by finger pressure, and a pressure sensor detects the pressure inside the cuff, resulting in a pulse wave obtained during the cuff pressure reduction process. The blood pressure value is determined based on the cuff pressure and the cuff pressure, and the cuff is pressurized to a predetermined pressure by a pressurizing means before starting measurement. Since the specific pressure to be applied to differs from person to person, conventionally a pressurization value setting device was provided to allow the pressurization value to be set in several stages, and the set value could be selected as appropriate by switching. are doing. In addition, if you want to increase the pressure higher than the pressure value set with the pressure setting device, turn on the start switch continuously, drive the pressure means, and check the display until the cuff pressure reaches the desired pressure. When this happens, the start switch is turned off to stop pressurization.

(c) Problems to be Solved by the Invention In the electronic blood pressure monitor for use, the cuff capacity is small, so that the desired set value is reached within a few seconds after the start of pressurization. Therefore,
After pressurizing to the value set on the pressurization value setting device, turn on the start switch while looking at the display, and try to pressurize to the predetermined value added to the set value, but the desired value will be instantly exceeded, and the actual value will be exceeded. Moreover, it was difficult to pressurize to a value other than that set by the pressurization value setting device. Therefore, it may be possible to increase the range of the pressure value setter so that the pressure value setter can be selected in detail, but if it has more ranges than the conventional four-stage switching range, the pressure value setter will be expensive. There is a problem in that the cost of the entire instrument increases.

In view of the above, an object of the present invention is to provide an electronic finger sphygmomanometer that can easily pressurize to a desired pressure value higher than a set value without requiring a cost amplifier compared to conventional ones.

(d) Means for solving the problem The electronic finger blood pressure monitor of the present invention has a cuff pressure for compressing the finger and a predetermined set pressure value (pressure a set pressure storage means 2 for storing a set value); a pressurizing means 3 for pressurizing the cuff up to the set pressure value; and a depressurizing means 4 for reducing the pressure in the cuff; a pulse wave sensor 5 for detecting; a pressure sensor 6 for detecting cuff pressure; and a blood pressure determining means 7 for determining blood pressure based on the pulse wave detected by the pulse wave sensor and the cuff pressure detected by the pressure sensor. , the set pressure updating means 8 adds a constant pressure value to the set pressure value to update the set pressure value, and the set pressure updating means is operated each time the set pressure value is operated, and the pressurizing means is operated. It is characteristically equipped with operation input means 9 for pressurizing the cuff to the updated set pressure value.

(E) Function In this electronic finger blood pressure monitor, at the start of measurement, the pressurizing means is activated to pressurize the cuff. The pressure is increased to a pressure value stored in the set pressure value storage means. When the operation input means is operated during pressurization, a constant pressure value is added to the set pressure value stored in the set pressure value storage means, and the set pressure value is updated. Then, pressurization is performed up to the updated set pressure value.

Subsequently, when the operation input means is operated, the set pressure value is added and updated again, and the cuff is similarly pressurized to the updated set pressure value.

(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, a start key (
An operation input means) 17 and a power key 18 are 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 (operation input means) 17a, and a power switch 18a correspond to a pressurization value setting device 15, a clear key 16, a start key 17, and a power key 18, respectively. , are designed to turn on when these keys are operated. On/off signals and setting signals for each of these switches are input to the CPU 20.

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

Further, the rapid exhaust valve drive circuit 23 is configured to control the opening and closing of the valve (pressure reducing means) 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 (pressure reducing means).

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 (Sr1). 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 r4 becomes YES, and then the ready mark is turned off (Sr1). Then move on to pressure treatment (Sr1)
.

In this pressurization process, first, the cuff rubber bag 19 is pressurized to a set value set by the pressurization value setter 15, and then the pressurization is stopped, and the process moves to the next measurement preprocess (Sr1). In this pre-measurement processing, processing such as waiting time for base line stabilization after completion of pressurization, step pressurization by detecting ON of the start switch 17a, and insufficient pressurization processing are performed. In this invention,
These pressurization treatments and measurement pretreatments are characteristic, and these treatments will be described in more detail later.

Following the measurement pre-processing, the systolic blood pressure is determined (Sr8);
Furthermore, the mean blood pressure is determined (Sr1), and the diastolic blood pressure is calculated from the determined systolic blood pressure and mean blood pressure (STI
O),! pulse rate is calculated (STII). Note that there are various algorithms for calculating the systolic blood pressure, mean blood pressure, and diastolic blood pressure. For example, the systolic blood pressure is defined as the cuff pressure value at the time when the pulse wave amplitude of the pulse wave detected by the pulse wave sensor exceeds a predetermined level, and the cuff pressure at the maximum value of the pulse wave amplitude is defined as the average blood pressure. The diastolic blood pressure is calculated from hypertension/average blood pressure by (3 x average blood pressure - systolic blood pressure)/2. However, in this invention, since the blood pressure determination process is not the main part, detailed explanation 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.
will be displayed.

When the measurement is completed, the motor 22 is turned off (ST12).
, the valve 24 for rapid exhaust is opened (ST13), the pressure in the cuff rubber bag 19 is rapidly exhausted, and the cuff pressure is now 20m.
When it becomes less than nHg (ST14), the light emitting element 30 stops emitting light (5T15), returns to Sr1 again, and waits for the next measurement.

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

When the operation enters the Sr1 pressurization process, 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 time will be counted again from 0.
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 Cuff-T (register:
The output of the pressurization value setter 15 is stored in the set pressure storage means (Sr23). This pressurization value setting device 15 is 140.1
The cuff pressure corresponding to the set value is C
Stored in uff-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 for waiting 200 milliseconds here is to wait for the valve 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. Then, it is stored in the counter S0 as Cuff-T. The value obtained by dividing the value by 8 and subtracting 5 from it, that is, the value of Cuff-T So-h□ is stored (Sr27). For example, when the pressurization value setter 15 is set to 140 mmHg, 18-5=13
will be stored in 80.

Next, it is determined whether or not the clear switch 16a is turned on (Sr28).Normally, the clear switch 16a is not turned on, so the determination is NO, and then Cuf
It is determined whether f−P≧Cuff−T (Sr29);
That is, the current cuff pressure Cuff-P is equal to the pressure setting value Cuf.
It is determined whether it is larger than f-T. During pressurization, this determination is No, and then it is determined whether timer T-IIJ<O (Sr30).

This timer T-1 is normally set to O at the beginning, so the determination is YES, and then this timer T, , l
is set to 200 milliseconds (Sr31).

At this point, the current pressure is displayed on the diastolic blood pressure display section of the display 14 (Sr32). Then, 1 from counter S0
For example, if we subtract 50=13, we get 5o-
12 and 5T33), and it is determined whether the counter S0 is O or not (Sr34). In the example, since 12 is stored in the counter S0, the determination is No at this point, the process returns to 5T28, and the processes 5T28 to 5T34 are repeated until the content of the counter S0 becomes O.

The fact that the processes 5T28 to 5T34 are repeated 12 times means that a timer time of 200 milliseconds is set each time, so 2.4 seconds is counted here. During this 2.4 seconds, the pressurization value setting device 15 normally sets the predetermined pressure 14.
It means the time it takes to reach 0mmHg, and the setting value is 17
When it is On+mHg, it is 3.2 seconds, when it is 200 mmHg, it is 4.0 seconds, and when it is 240 mdg, it is 5°0 seconds.

Of course, this time varies depending on the capacity of the air tank 24, the pumping speed, etc., but it is set in this manner in this embodiment.

Even after the above time (for example, 2.4 seconds at 140 mm) Ig has elapsed, the current pressure Cuff-P still changes to the set pressure Cuff-
If it is smaller than T, that is, 140 mmHg, that is, if the determination of 50=0 at 5T34 is YES, this means that the current pressure Cuff-P is still the set pressure C even after 2.4 seconds have passed.
Indicates that uff-T has not been reached, in this case,
Indicates that the finger is not inserted properly into the cuff rubber bag 19, an error message is displayed (5T35), followed by a beep sound for 2 seconds by the buzzer 36 (5T36), and register H1l for pulse rate detection is set to O in 5T37. Then, the process moves on to exhaust processing after 5T12.

In other words, the pressure will not increase further. In addition, when repressurizing, which will be described later, the pressurizing instruction symbol that lights up. Turn off the light (Sr38).

Until the determination of "Is 5o=O" in 5T34 becomes YES, that is, until reaching 2.4 seconds after the start of pressurization, the determination of "Is Cuff-P≧Cuff-T" in the determination of 5T29 becomes YES.
This indicates that the pressurization is normal, the motor 22 is stopped at 5T39, and the process moves to the next measurement preprocessing. Also, is there a pressurization instruction symbol here when repressurizing? Turn off (
Sr40).

<Measurement preprocessing> Next, details of the measurement preprocessing of Sr1 shown in FIG. 4 will be explained with reference to the flowchart shown in FIG. 6.

When pressurization is completed and measurement pre-processing begins, the auto power-off timer is reset at 5T41, and then 4 is set in the counter S0 (Sr42). Next, it is determined whether the clear switch 16a is turned on (5T43), and if it is not turned on, it is further determined whether the start switch 17a is turned on (Sr44). If the start switch 17a is not turned on, it is determined whether the timer T-1 is 0 (Sr45). At first, timer T is O, this judgment becomes YES, and then timer T-1 is set to 500.
Set the millisecond (Sr46), display the current pressure on the diastolic blood pressure display section of the display 14 (Sr47), then subtract 1 from the counter S0 at 5T48 (SO=3), 5o= It is determined whether it is 0 or not (5T49), and if it is not 0, it returns to 5T43. Thereafter, unless the clear switch 16a and start switch 17a are turned on, the processing of 5T43.5T44.5T45 is repeated until the timer T-, times up. Timer T-r times up,
When it reaches 0, timer T-1 is set to 500 milliseconds again at 5T46, and the cuff pressure at that time is displayed.5T47)
, subtract 1 from the counter S0 again (Sr48), and from then on,
5T43~5T until So becomes 0, that is, 3 times
49 is repeated. Then, 500 milliseconds x 3 = 1.
Wait for 5 seconds. This is to allow time from the end of pressurization until the output of the pulse wave sensor stabilizes.

When 5T49 becomes 80-0, move to 5T50 and AMP
-FSAMP-1, PULS-H is set to 0, PUL
Let S −1 be 5000 and So be 4.

Here, AMP-F indicates a pulse wave flag, which becomes "1" when a pulse wave is detected. AMP-1 is an area for storing the amplitude of the detected first pulse wave, PULS-) is an area for storing the maximum value of the pulse wave component, and PULS-L is an area for storing the maximum value of the pulse wave component.
This is an area that stores the lowest value of the pulse wave component.

Next, it is determined whether the clear switch 16a is turned on and whether the start switch 17a is turned on (Sr51.5T52). If none of the switches are turned on, it is determined whether the timer T-I is O or not (5T53), and since it is initially O, the determination is YES, and then the timer T-+ is set to 500:1. Set the IJ seconds (5T54) and display the current pressure on the diastolic blood pressure display (S
r55) as well as the counter S. It is difficult to determine whether the pulse wave flag AMP-F is 0 or not.5T57.5T58
), if counter S0 is not O and AMP-F is O, then
Return to 5751. Then, 1.5 seconds have elapsed since 5T50, that is, until the counter S0 becomes 0 or AMP-F becomes 1, the steps 5T51 to 3T58 are repeated. The reason for waiting 1.5 seconds from 5T50 is to detect insufficient pressurization.

The pulse wave is detected at a predetermined period by a process not shown, and when the output change (gradient) of the pulse wave sensor exceeds a predetermined value,
An interrupt is generated to set the pulse wave flag AMP-F to 1. 5T57
If the pulse wave flag AMP-F becomes "1" before 5o=0, that is, before 1.5 seconds have elapsed, it means that pressurization is insufficient, and the process moves to 5T59. On the other hand, AMP-F is O
If 1.5 seconds pass during this time, it is determined that the pressurization is not insufficient, and the process moves from 5T57 to Sr1 in FIG. 4.

At 5T59, if the pulse wave amplitude AMP-1 is 100 or more, the pressurization set value is updated by adding +30 to the contents of Cuff-T in which the pressurization value is stored (Sr60).

Then, it is determined whether the updated pressure setting value is 230mmHg or more or not. If it is 230mmHg or more, re-pressurization is prohibited, so the error display EL is lit and 2
5T62) that sounds the buzzer 36 for seconds, 5T1 in Figure 4
Move to step 2 and begin exhaust processing.

In 5T61, if the updated pressurization setting value is 230 mmHg or less, the symbol ↑ on the display 14 will flash and a buzzer will sound "beep, beep, beep" (Sr.
63), the measurer is notified that the pressure will be reapplied. Then, the process returns to 5T26 in FIG. 5 and starts the pressurizing operation again.

Next, step repressurization, which is a feature of the present invention, will be explained.

When it is desired to increase the pressurization value by a predetermined value more than the pressurization value set by the pressurization value setter 15, the start switch 17a is turned on. Start switch 17a of 5T44 if this is turned on during the first 1.5 seconds of timing (Sr43 to 5T49), and of 5T52 if it is during the second 1.5 seconds of timing (Sr51 to 5T57). When the determination as to whether it is on is YES in both cases, the process moves to 5T64, where the Cuff-T is stored where the pressurization setting value set by the pressurization value setter 15 is stored.
+30 (step value) to update the pressurization set value (set pressure updating means). For example, if the value set by the pressurization value setter 15 is 140 mmHg, the updated pressurization setting value becomes 170 mmHg. Then, each time the start switch 17a is turned on, the pressurization setting value is set to 3QmmH.
It will increase by g. This start switch 17
Of course, the increase value of a for each operation may be selected to be another value.

If the updated pressure setting value exceeds 300mmHg (S
r15), moving to Sr12, prohibiting pressurization to a value higher than that, but if it does not reach 300mmHH, the symbol? is displayed blinking, and the buzzer 36 outputs a sound of "beep, beep, beep, beep" to notify the measurer that re-pressurization will begin (Sr63).

Then, the process returns to 5T26 in FIG. 5, and the pressurizing operation starts again.

When repressurizing reaches 5T38.5T40, is it a symbol? is turned off.

Note that if the clear switch 16a is turned on during the measurement process, the determination of 5T43 or Sr51 becomes YES, and the
Proceeding to T66, H3 is set to O, the systolic blood pressure display section is completely turned off, the buzzer 36 emits a beeping sound for one second (Sr67), and the process moves to exhaust processing.

Further, in the above embodiment, the start switch is also used as an operation input means for updating the pressurization setting value in steps, but a dedicated switch may be provided separately from the start switch.

(G) Effects of the Invention According to the present invention, the pressurization setting value can be increased by a predetermined value each time an operation input means such as a key switch is operated, and the pressurization setting value can be increased by a predetermined value, without using a rotary switch with many switching ranges.
More than simple and relatively small settings using a pressurization value setter,
Pressure can be increased to a desired pressure, making the finger electronic blood pressure monitor very convenient to handle.

[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.
2 is a flowchart showing in detail a measurement preprocessing routine of the same overall flowchart. 1: Cuff, 2: Setting pressure storage means, 3: Pressurizing means, 4: Decompression means, 5: Pulse wave sensor, 6: Pressure sensor, 7: Blood pressure determining means, 8: Setting pressure updating means, 9: Operation input means. Patent applicant Tateishi Electric Co., Ltd. Agent
Patent attorney Shigeru Nakamura Trust procedure amendment form) February 1, 1986

Claims (2)

[Claims] (1) A cuff for compressing a finger, a set pressure storage means for storing a predetermined set pressure value, a pressurizing means for pressurizing the cuff to the set pressure value, and reducing the pressure of the cuff. a pressure reducing means, a pulse wave sensor attached to the cuff and detecting a pulse wave from the finger, a pressure sensor detecting the pressure of the cuff, and a pulse wave detected by the pulse wave sensor and a pulse wave detected by the pressure sensor. a blood pressure determining means for determining the blood pressure based on the cuff pressure of the finger; a set pressure updating means for updating the set pressure value by adding a constant pressure value to the set pressure value; Each time the set pressure is operated, the set pressure updating means is operated, and the pressurizing means is operated,
An electronic finger blood pressure monitor comprising an operation input means for pressurizing a cuff to an updated set pressure value. (2) The finger electronic blood pressure monitor according to claim 1, wherein the operation input means also serves as a start switch.