JPH0747022B2 - Electronic blood pressure monitor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a raw paper sphygmomanometer, and particularly to an electronic sphygmomanometer capable of shortening the measurement time.

(B) Conventional technology A conventional electronic sphygmomanometer is equipped with a pressurization set value device, and the measurer sets the pressurization target value in advance in consideration of his or her systolic blood pressure, and then turns on the start switch. After pressurizing the cuff with a pump and pressurizing to the set value, pressurize by detecting whether the pressurization is insufficient, for example, whether K sound is detected immediately after measurement. When a shortage is detected,
Further, it is known that a value obtained by adding a predetermined value to the pressurization target value is used as a target value and re-pressurization is performed for measurement.

In the conventional electronic sphygmomanometer having this re-pressurizing function, the change in cuff pressure when re-pressurizing is performed is as shown in FIG. Assuming that the set value by the first pressurizer is PC ₁ , pressurization will start at point a, stop pressurization at point b, move to slow exhaust, and detect insufficient pressurization at point c to reapply pressure. Shift to pressure,
Increase the cuff pressure to the correction setting value PC ₂ at point d, and then
Move to slow exhaust, determine systolic blood pressure (SYS) at point e, f
The lowest blood pressure (DIA) is determined at the point, rapid exhaust starts at the point g, and ends at the point h.

(C) Problems to be Solved by the Invention In the above conventional electronic blood pressure monitor, when measurement with re-pressurization as shown in FIG. 5 is performed, and then the same person again performs the next measurement, Since the target value of pressurization, that is, the set value of the pressurization setter itself is referred to the value of the setter again, it is possible to measure the relatively long time including the first slow speed exhaustion and repressurization time in the same way many times. Since the above procedure is repeated, there is a problem that congestion and the like are caused, which causes pain to the measurer and also deteriorates the measurement accuracy.

Therefore, in the case of such continuous measurement of the same person, if re-pressurization is used the last time, the pressurization set value is switched and set to the pressurization set value that is one rank larger, and thereafter the measurement time is increased. Can be shortened. However, in this case, there is an operational complexity that the pressure setting device must be modified and changed.

In view of the above, the present invention performs proper pressurization without performing repressurization processing without operating the set value of the pressurizer when the same person continuously performs the measurement. The purpose is to provide an electronic blood pressure monitor to obtain.

(D) Means and Actions for Solving Problems The electronic sphygmomanometer of the present invention has a cuff, pressurizing means for pressurizing the inside of the cuff, a setting device for setting a pressurization target value, and setting by this setting device. A means for determining whether or not the pressurization to the value is insufficient, a re-pressurizing means for adding a predetermined value to the set value when the pressurization is insufficient, and pressurizing to the corrected and set value, and A decompression means for decompressing the cuff at a very low speed, a pressure detection means for detecting the pressure inside the cuff, a detection means for detecting blood vessel information in the decompression process of the cuff, and an output signal of the pressure detection means and the information detection means. In a device including a blood pressure determining means for determining high blood pressure and a diastolic blood pressure, and a display means for displaying the determined blood pressure value, a cuff detachment detecting means for detecting whether or not the cuff is detached, and the corrected pressurization target value. At the start of measurement. In response to the output of the presence or absence of the cuff attachment / detachment of the cuff attachment / detachment detection means, the current pressurization target value is set to the previously corrected pressurization target value.

This electronic sphygmomanometer can measure 2
At the time of shifting to the second measurement, the cuff is not removed and is still attached, so the cuff detachment detection means outputs a signal indicating no detachment, and in response to this output, the target pressure target value Is the last pressurization target value of the last time. for that reason,
The measurement can be performed smoothly without the need to re-pressurize.

When the cuff attachment / detachment detection unit outputs a signal indicating that attachment / detachment is present, the set value of the pressurization setting device at that time is set as the pressurization target value.

(E) Examples Hereinafter, the present invention will be described in more detail with reference to Examples.

FIG. 2 is a block diagram of an electronic sphygmomanometer in which the present invention is implemented. In the figure, the cuff 1 is connected by an air pipe 2 to a pressurizing pump 3, a rapid exhaust valve 4, a slow exhaust valve 5 and a pressurizing sensor 6. The pressurizing pump 3 is turned on / off according to a command from the MPU 9 to pressurize the cuff 1. The quick exhaust valve 4 is provided to rapidly reduce the pressure inside the cuff 1 in response to a command from the MPU 9.

The pressure sensor 6 converts the air pressure in the cuff 1 into an electric signal. This electric signal is amplified by the amplifier circuit 7, converted into a digital signal by the A / D converter 8 and input to the MPU 9.
Further, a K-sound sensor (microphone) 10 is attached to the cuff 1, and the output of the k-sound sensor 10 is applied to a comparison circuit 12 via an amplification circuit 11. The comparison circuit 12 compares the K sound signal with the reference signal, and when the K sound signal is larger than the reference signal, inputs the K sound presence signal to the MPU 9.

To the MPU 9, on / off signals of the power switch 14 and the start switch 15 and set values of the pressurization setting device 16 are input. On the other hand, the blood pressure value output from MPU9 is
It is displayed on the display 13.

A detachable sensor 17 is further attached to the cuff 1. As shown in FIG. 3, the detachable sensor 17 is provided with a cuff 1
Is a push switch that is installed in parallel with the magic fastener 1a, and the cuff 1 is attached to the upper arm.
When 1b is joined, this push switch turns on. Magic fasteners 1a and 1b are removed,
When the cuff 1 is removed, the push switch turns off. That is, the detachment sensor 17 outputs an ON signal when the cuff 1 is in the mounted state, and outputs an OFF signal when the cuff 1 is detached (demounted state). The on / off signal of the attachment / detachment sensor 17 is captured by the MPU 9.

The MPU 9 has a function of turning on / off the pressurizing pump 3 and the quick exhaust valve 4, and also receives a signal from the detachment sensor 17 to provide the cuff 1.
Has a function of determining whether or not the blood pressure has been detached, a function of storing the previous target pressure value, a function of determining the systolic blood pressure and the diastolic blood pressure based on the cuff pressure and the K sound signal.

Next, the operation of the electronic blood pressure monitor of this embodiment will be described with reference to the flowchart shown in FIG.

When the power switch 14 is turned on and the operation is started, first, initialization processing such as clearing of registers is performed [step ST (hereinafter referred to as ST) 1], and then the start switch 15 is waited to be turned on (ST2). . When the start switch 15 is turned on, the determination in ST2 becomes YES, and then it is determined whether or not the cuff 1 is attached / detached (ST3). Assuming that the person to be measured performs the first measurement, the cuff 1 is wrapped around the upper arm, the magic fasteners 1a and 1b are joined, and the cuff 1 is attached, so that the detachment sensor 17 outputs an off signal → an on signal. However, in this case, desorption is required. Therefore, the ST3 judgment is N
It becomes O, moves to ST4, reads the setting value of pressure setting device 16,
This set value is the pressurization target value. For example, pressure setting device 16
If the setting value of is 140 mmHg, this 140 mmHg becomes the pressurization target value. At the same time, the pressurizing pump 3 is turned on to start pressurizing (ST6). This pressurization is continued until the cuff pressure reaches the pressurization target value (ST7). When the cuff pressure reaches the pressurization target value, the determination of "is the pressurization target value?" In ST7 is YES, the pressurizing pump 3 is turned off, and pressurization is stopped (ST8). After that, the pressure in the cuff 1 is exhausted through the slow exhaust valve 5. In other words, it enters the slow exhaust (ST9).

After that, in the process of this slow exhaust, it is determined whether or not there is a K sound (SR10).
It is determined whether seconds have passed (ST11). If one second has not elapsed, it means that the K sound was detected immediately after entering the slow-speed exhaust, and in this case, pressurization was insufficient and ST12
Press +30 mmHg (eg: 170 mmHg) to the set value of the pressure setting device 16 (eg: 140 mmHg), and use that value as the new target pressure value (ST1
2) Return to ST6 and turn on the pressurizing pump 3 to repressurize to a new target value for pressurization.

On the other hand, when K sound is detected for more than 1 second after entering the slow-speed exhaust, the determinations in ST10 and ST11 are YES, which means that normal pressurization is performed. Therefore, K
The cuff pressure at the time of sound discrimination is determined as the systolic blood pressure (ST13).
The systolic blood pressure is stored in the memory as the final pressurization target value (eg, 170 mmHg) (ST14). When the pressure is further reduced, the K sound disappears, but the cuff pressure corresponding to the time when the K sound disappears is determined to be the minimum blood pressure (ST15), and then the quick exhaust valve 4 is opened (ST16). The systolic blood pressure and the diastolic blood pressure are displayed on the display 13 (ST17). This completes the measurement this time, and unless the power switch 14 is turned off (ST18), returns to ST2 and waits until the start switch 15 is turned on for the next measurement.

When the same person to be measured subsequently continues the measurement as it is, the cuff 1 is still worn. When the start switch 15 is turned on for the second measurement, it is next determined whether or not the cuff 1 is attached / detached (ST13). In the case of the same person, the detachment sensor 17 remains on, which means no detachment.
Therefore, the determination in ST3 is YES, and subsequently the final pressurization target value stored in the previous measurement is determined as the present pressurization target value (ST5). In the example explained above, it is 170 mmHg. And this time, naturally, the pressure is increased to the target pressure value. Therefore, the re-pressurizing process performed in the previous time becomes unnecessary.

The pressurization situation of continuous measurement by the same person will be described with reference to FIG.

The first measurement is the same as in the case of FIG. 5, starting pressurization at point a, pressurizing to PC ₁ which is the set value of pressurization setting device 16 (point b), and shifting to slow exhaust. Insufficient pressurization is detected at points c and c, the pressure is repressurized to increase to PC ₂ (point d), and the systolic blood pressure (point e) and the minimum blood pressure (point f) are determined in the subsequent depressurization process. Incidentally, than e 'point, and stores the final pressurization target value PC _2.

Next, in the second measurement, pressurization starts at point i, and this time pressurizes up to the last stored final pressurization target value PC ₂ (point j).
To do. Then, the vehicle enters the slow speed exhaustion, but in this case, the pressurization is not insufficient, and the systolic blood pressure and the diastolic blood pressure are determined at the points k and m, respectively. Then, the final pressurization target value measured this time is also stored at the k point after the determination of the systolic blood pressure. This final pressurization target value will be used as the next pressurization target value as long as the same person is used. Therefore, in the second and subsequent measurements, re-pressurization is unnecessary, the measurement time is shortened, and pain such as congestion is alleviated.

When the first measurement is completed and the person to be measured changes in the next measurement, the cuff 1 is removed and reattached, so that the detachment sensor 17 outputs a detachment presence signal. Therefore, the determination in ST3 is NO, the process proceeds to ST4, and the set value of the pressurization setting device 16 is read as the current pressurization target value.

In the above embodiment, the cuff 1 is used as the detachable sensor 17.
Although the push switch provided in the above is taken as an example, instead of this, a means for detecting a change in the output level of the K sound sensor, or a means for detecting the pulse wave of the cuff pressure by the pulse wave sensor and detecting the level change Etc. may be used.

(F) Effect of the Invention According to the present invention, the cuff attachment / detachment detection means at the start of measurement includes a cuff attachment / detachment detection means for detecting the presence / absence of attachment / detachment of a cuff, and a means for storing a corrected target pressure value. In response to the output without the removal of the cuff, the current pressurization target value is set as the previous pressurization target value.
If there is a previous pressurization and the pressurization target value is corrected, the previous final pressurization target value will become the new pressurization target value after the second time, so re-apply at the second and subsequent measurements. There is no need to perform pressure treatment, therefore the measurement time after the second measurement can be shortened, and phenomena such as congestion can be avoided,
The measurer has the advantage of reducing pain and improving the measurement accuracy.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining the configuration and operation of an electronic sphygmomanometer according to an embodiment of the present invention, FIG. 2 is a block diagram of the electronic sphygmomanometer, and FIG. 3 is a detachable sensor for the electronic sphygmomanometer. FIG. 4 is a perspective view of the cuff provided with, and FIG. 4 is a view showing a change in the cuff pressure when the same person continuously measures the electronic blood pressure monitor. FIG. 5 is a repressurization of a conventional electronic blood pressure monitor. It is a figure which shows the change of the cuff pressure at the time of processing. 1: Cuff, 3: Pressurizing pump, 5: Fine speed exhaust valve, 6: Pressure sensor,
9: MPU, 10: K sound sensor, 16: Pressure setting device, 17: Desorption sensor.

Claims (1)

[Claims] 1. A cuff, a pressurizing means for pressurizing the inside of the cuff, a setter for setting a pressurizing target value, and means for determining whether or not pressurization up to a set value by the setter is insufficient. In the case of insufficient pressurization, a predetermined value is added to the set value, a repressurizing means for pressurizing to a corrected and set value, a depressurizing means for slightly depressurizing the cuff after pressurization, and the cuff internal pressure are detected. Pressure detection means, information detection means for detecting blood vessel information in the depressurization process of the cuff, blood pressure determination means for determining systolic blood pressure and diastolic blood pressure based on output signals of the pressure detection means and the information detection means, In an electronic sphygmomanometer including a display means for displaying a blood pressure value, a cuff attachment / detachment detection means for detecting the presence / absence of attachment / detachment of the cuff,
And a means for storing the corrected target pressure value, and responding to the output of the cuff removal detection means at the start of measurement with or without the removal of the cuff, the current target pressure value is corrected by the previous corrected pressure. An electronic sphygmomanometer characterized by setting it as a target value.