JPS5829089B2 - automatic blood pressure monitor - Google Patents

Description

Detailed Description of the Invention The present invention incorporates a pump for supplying air to the cuff, and uses automatic hydraulic pressure to continuously increase the pressure inside the cuff, gradually reduce the pressure by slow evacuation, and rapidly evacuation after measuring the lowest suppression value. It is related to the meter.

In the above-mentioned automatic oil pressure gauge, the pressure inside the cuff is first increased by a pump, and at this time, the pressure is monitored and the pump is stopped when the pressure reaches an appropriate value.

However, if the pump is of a pulsating type such as a diaphragm pump, the pressure cannot be accurately monitored during pump operation, so the pulsation must be smoothed out.

Furthermore, when measuring the extraction pressure, the air inside the cuff is gradually removed to lower the pressure; however, if the pressure reduction rate is too slow, the measurement will take time, and if it is too fast, the measurement accuracy will decrease.

Furthermore, after measuring the minimum muscle pressure, it is necessary to quickly expel the air inside the cuff.

The present invention has been made in view of these points, and its objectives are to monitor the pressure when the pressure rises during extraction pressure measurement, to perform slow exhaust to gradually reduce the pressure, and to monitor the pressure after measuring the lowest oil pressure value. The object of the present invention is to provide an automatic oil pressure gauge that can perform both rapid exhaust and exhaust under optimal conditions.

Hereinafter, the present invention will be explained in detail.The present invention includes a first solenoid valve that switches between rapid exhaust, stopping exhaust, and slow exhaust, and a second solenoid valve that switches between stopping exhaust and slow exhaust. A pressure sensing part connected to a connecting pipe connecting a solenoid valve,
It has a first orifice section for smoothing pulsation and a second orifice section that throttles the exhaust volume for slow exhaust. The present invention is characterized in that a second orifice portion is disposed between the connection point and the second solenoid valve, and this configuration achieves the above object, Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

2 in the figure is an automatic internal pressure gauge main body (hereinafter abbreviated as the main body), and the main body 2 has a built-in pump 1 such as a tire flam pump to drive a motor 8 and send air to the cuff 6. be.

This pump 1 is connected to a solenoid valve 3 by a connecting pipe 5 such as a rubber tube, and the connecting pipe 5 is connected to a cuff 6 via a cuff connecting pipe 7 made of a rubber tube branched from the middle. .

The cuff connecting tube 7 consists of a first cuff connecting tube 7a built into the main body 2 and a second cuff connecting tube 7b attached to the cuff 6.

The first cuff connecting tube 7a and the second cuff connecting tube 7b are connected by inserting an insertion plug 9 into an insertion port 10.

The second cuff connecting tube 7b is connected to a sound collecting rubber tube 11b, and the sound collecting rubber tube 11b is connected to the microphone 12 via the sound collecting rubber tube 11a inside the main body 2. ing.

The electromagnetic valve 3 is a three-way valve type with two-position switching, and one of the two output sides is open to the atmosphere, and the remaining output side 01 has a pipe diameter of about 0.3 mmφ, for example, and an orifice section. 4, and communicates with another electromagnetic valve 14 disposed below via a connecting pipe 13.

The other electromagnetic valve 14 is a two-way valve whose output side is open to the atmosphere, and has an orifice portion 15 formed by narrowing the pipe diameter of the input side 0□ to, for example, about 0.2 φ.

The above-mentioned connecting pipe 13 communicates with a pressure detection section 19 consisting of a bellows 17 and a differential transformer 18 via a branched rubber pipe 16 branched from the middle, and this pressure detection section 19 is connected to a display panel 20. There is.

Therefore, to measure the extraction pressure, first turn the power switch knob 2.
1 is turned on, the cuff 6 is wrapped around the human arm, and the measurement start switch 22 is turned on.
4, and the solenoid valve 14 is sealed.

Next, the motor 8 operates, the pump 1 operates, and the connecting pipe 5,
Air is supplied through the cuff connecting tube 7, and the pressure inside the cuff 6 increases.

The air that has reached the solenoid valve 3 via the connecting pipe 5 is transferred to the orifice section 4.
The pulsation is relaxed and smoothed by the pressure sensing section 19.
As a result, the pressure fluctuation value becomes ±2 mmHg and the pressure continues to rise.

After the pressure is increased to the maximum extraction pressure value or higher, the solenoid valve 14 is turned off (air starts to flow into the solenoid valve 14), and the air passes through the orifice part 15 on the input side 02 of the solenoid valve 14 and flows into the solenoid valve 14. It is released into the atmosphere from the valve 14 at a rate of 2 to 3 mmH9/sec.
(e.g. around 140 mmHg).

At this time, the maximum and minimum extraction pressures are latched displayed on the display panel 20 depending on the appearance and disappearance of the Korotkoff sound from the microphone 12.

The solenoid valve 3 is then opened and the passage to the solenoid valve 14 is blocked.

Here, the internal pressure of the cuff 6 is released to the atmosphere by releasing air from the electromagnetic valve 3, while the internal pressure of the bellows 17 is released to the atmosphere by releasing air from the electromagnetic valve 14 through the orifice portion 15.

Incidentally, when measuring the continuous extraction pressure using an automatic depressor as in the above embodiment, air still remains in the cuff 6 and the pressure has not reached atmospheric pressure, but the volume of the bellows is equal to the volume of the cuff 6. It is relatively small, and is exposed to the atmosphere through the orifice portion 15 of the solenoid valve 14, reaching atmospheric pressure earlier than the inside of the cuff 6.

Therefore, when restarting measurement in such a state, it is only necessary to carry out zero calibration based on the value indicated by the pressure detection section 19.

As described above, in the present invention, the first and second solenoid valves are used to set the closing of the pressure circuit to the atmosphere when the pressure increases, and the slow exhaust and rapid exhaust states when releasing air from the cuff. Since the pulsation of the air when the pressure rises when the pump is operated is alleviated and smoothed by the first orifice part, the pressure monitoring by the pressure sensing part becomes accurate when the pressure rises. , and the slow exhaust for gradual pressure reduction during extraction pressure measurement is the second
Since the degree of pressure reduction is controlled by the orifice part of the valve, it is possible to reduce the pressure at the optimum degree of pressure reduction for extraction pressure measurement, and furthermore, the rapid exhaust after the minimum suppression measurement is carried out by the first solenoid valve to the atmosphere. All you need to do is connect the cuff to the opened output side.
A large amount of air inside the cuff can be quickly discharged, and the air remaining in the pressure sensing part is exhausted to the atmosphere through the orifice of the second solenoid valve. Since it is a small amount, it can be quickly discharged and the pressure can be lowered to atmospheric pressure.

[Brief explanation of drawings]

Fig. 1 is a piping diagram of an embodiment of the present invention when the power is turned off, Fig. 2 is an overall perspective view of the same, Fig. 3 is a cross-sectional view of the same, and Figs. 4 and 5 are longitudinal sectional views of the same. It is. In the figure, 1 is the pump, 2 is the automatic oil pressure gauge body, 3 is the solenoid valve, 4
1 is an orifice portion, 5 is a connecting tube, 6 is a cuff, 7 is a cuff connecting tube, 13 is a connecting tube, 14 is a solenoid valve, 15 is an orifice portion, and 19 is a pressure sensing portion.

Claims (1)

[Claims] 1 The input side is connected to the air discharge port of the pump built into the automatic extraction pressure gauge body via a connecting pipe, and the communication with this input side is selectively controlled. One of the two output sides is open to the atmosphere. a three-way valve type first solenoid valve, a cuff connecting pipe connecting the connecting pipe and the cuff, and a connecting pipe connected to the other of the two output sides of the first solenoid valve. a two-way valve-type second solenoid valve to which the input side is connected and which controls the opening and closing of communication between the input side and the output side open to the atmosphere; a pressure detection section connected to the connection pipe; a first orifice section for slow exhaust, and a second orifice section for slow exhaust that throttles the exhaust flow rate when air in the cuff is discharged into the atmosphere through the first solenoid valve and the second solenoid valve. The first orifice section is arranged between the connection point between the pressure sensing section and the connecting pipe and the first solenoid valve, and the second orifice section is arranged between the connection point and the second solenoid valve. An automatic oil pressure gauge characterized by being located between the oil pressure gauge and the oil pressure gauge.