JPS6133577B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic blood pressure monitor.

In the case of an automatic blood pressure monitor that has a pressure detection section equipped with a bellows and a differential transformer, when detecting pressure, there is an initial displacement of the bellows, that is, a change in the relative position of the bellows and the differential transformer due to a drop impact, etc. Accurate pressure will not be displayed. Therefore, it is necessary to measure this initial displacement value as zero. Additionally, if the cuff is not properly wrapped when wrapped around the arm, it will take time for the pressure inside the cuff to return to atmospheric pressure, but it is desirable that the waiting time before restarting is short. . Furthermore, when measuring several people in succession in a group medical examination or the like, in addition to the above-mentioned initial displacement, initial changes due to the environment such as temperature may occur. Therefore, zero calibration must be performed every measurement. However, with conventional automatic blood pressure monitors, after blood pressure measurement, the cuff and bellows are kept in communication and the air inside them is released to the atmosphere through a common solenoid valve, so the system waits until the pressure in the bellows reaches atmospheric pressure. Without it, zero calibration could not be performed, and in fact zero calibration could not be performed.

The present invention has been made in view of such conventional drawbacks, and its purpose is to provide an automatic blood pressure monitor that can perform zero calibration every time measurement is started, and can perform zero calibration in a short time. .

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. 1 in the figure is an automatic blood pressure monitor main body (hereinafter abbreviated as main body), and a pump 9 such as a diaphragm pump that is driven by a motor 8 and sends air to the cuff 3 is built into the main body 1. be. This pump 9 is connected to the electromagnetic valve 2 by a connecting pipe 10 such as a rubber tube, and the connecting pipe 10 is connected to the cuff 3 via a cam connecting pipe 11 made of a rubber tube or the like that branches off from the middle. . The cuff connecting tube 11 consists of a first cuff connecting tube 11a built in the main body 1 and a second cuff connecting tube 11b attached to the cuff 3. First cuff connecting tube 11a and second cuff connecting tube 1
1b is connected by inserting a plug 12 into a socket 13. A sound collecting rubber tube 14b is connected to the second cuff connecting tube 11b, and the sound collecting rubber tube 14b is connected to the microphone 15 via the sound collecting rubber tube 14a inside the main body 1. It's summery. The electromagnetic valve 2 is a three-way valve, including an atmospheric opening 7 and an inlet 1 on the input side.
6 and an outlet 17 on the output side O ₁ ,
These can be opened and closed by operating a valve 18. This inlet port 16 is connected to a connecting pipe 10, and an orifice portion 19 is formed in front of the outlet port 17 by narrowing the pipe diameter to about 0.3 mmφ. It is connected via a pipe 20 to another solenoid valve 21 arranged below the solenoid valve 2 . This electromagnetic valve 21 is a two-way valve, and has an orifice portion 22 formed by narrowing the pipe diameter of the input side O ₂ to about 0.2 mmφ, and the output side is opened to the atmosphere. Here, the orifice part 19 is for relaxing and smoothing the pulsation during pressurization by the pump 9 and transmitting it to the pressure detection part 6, and the orifice part 22 is for slowly exhausting the air in the cuff 3 when measuring blood pressure. It is for the purpose of At this time, the diameter of the orifice part 19 is set to about 0.3 mmφ, and the orifice part 22
The diameter of the tube is approximately 0.2 mmφ, but it is not limited to this value. However, if the diameter of the orifice portion 19 is about 0.3 mmφ, there will be enough resistance to prevent the pulsation of the pump 9 from being transmitted, and if it is extremely smaller than 0.3 mmφ, the resistance will be so great that pressure will not be transmitted accurately. Also, if the diameter of the orifice part 22 is about 0.2 mmφ, it will provide a resistance that allows air to escape at an appropriate speed for blood pressure measurement, and if it is extremely larger than 0.2 mmφ, there will be less resistance and air will escape quickly, allowing blood pressure measurement to be performed. If it is extremely smaller than 0.2mmφ, the resistance will be too large and it will take too long for the air to escape.
The above-mentioned communication pipe 20 has a branch pipe 23 branched from the middle.
It communicates with a pressure sensing section 6 equipped with a bellows 4 and a differential transformer 5 via. The pressure detection section 6 converts the pressure of the air within the bellows 4 into an electrical signal using the differential transformer 5 and detects it, and displays the detected pressure on the meter 24. Further, this pressure detection section 6 is connected to a display panel 25. Note that the volume of the bellows 4 is smaller than the volume of the cuff 3, similar to a normal automatic blood pressure monitor. In addition, as mentioned above, the pipe diameter of the orifice part 19 is about 0.3 mmφ, and the pipe diameter of the orifice part 22 is about 0.3 mmφ.
The reason why the diameter of the orifice portion 22 is made smaller than the diameter of the orifice portion 19 by approximately 0.2 mmφ is as follows. If the pipe diameter of the orifice part 22 is made larger than the pipe diameter of the orifice part 19, when the solenoid valve 21 is opened, the amount of air that passes through the orifice part 22 and escapes will be greater than the amount of air that passes through the orifice part 19. The pressure in the cuff 3 cannot be measured because pressure is not transmitted to the cuff 3. For this reason, the orifice part 19
It is necessary to make the diameter of the orifice portion 22 smaller to make it difficult for air to escape. As mentioned above, if the diameter of the orifice section 19 is set to 0.3 mmφ and the diameter of the orifice section 22 is set to 0.2 mmφ, and the cross-sectional area is doubled, the pressure sensing section 6 can accurately measure the pressure, and the air can be detected at an appropriate speed. is released from the solenoid valve 21.

To measure blood pressure, turn on the power switch knob 26 in advance, wrap the cuff 3 around the human arm, and turn on the measurement start switch 27. Then, the solenoid valve 2 is activated and the solenoid valve is turned on. The inflow port 16 and the discharge port 17 of No. 2 are communicated with each other, and the solenoid valve 21 is operated to close the communication of the solenoid valve 21. Next, the motor 8 is activated, the pump 9 is activated, air is supplied through the connecting tube 10 and the cuff connecting tube 11, and the pressure inside the cuff 3 increases. At this time, the air that has reached the outlet 17 of the solenoid valve 2 via the connecting pipe 10 has its pulsation reduced by the orifice part 19 and is transmitted to the smoothed pressure detection part 6, so that the pressure fluctuation value becomes less than ±2 mmHg. The pressure continues to rise. After the pressure is increased above the systolic blood pressure value (for example, around 140 mmHg), the solenoid valve 21 is activated and the solenoid valve 21 is opened. The air supply is set to be stopped, and when the set pressure is reached, the solenoid valve 21 is automatically opened), and the air is connected to the input side O ₂ of the solenoid valve 21.
It is discharged to the atmosphere from the solenoid valve 21 through the orifice part 22, and the pressure is reduced at 2 to 3 mmHg/sec. At this time, the maximum and diastolic blood pressures are indicated on the display panel 2 by the appearance and disappearance of Korotkoff sounds from the microphone 15.
5 will be latched. When the measurement of the diastolic blood pressure is completed, the electromagnetic valve 2 is activated and the inlet 16 and the atmospheric opening 7 communicate with each other. Then, the air inside the cuff 3 is released to the atmosphere from the atmosphere opening 7 of the solenoid valve 2, and the pressure inside the cuff 3 becomes atmospheric pressure. On the other hand, the air within the bellows 4 is discharged to the atmosphere from the solenoid valve 21 through the orifice portion 22 and becomes atmospheric pressure. At this time, the air that escapes from the solenoid valve 21 is difficult to escape due to the resistance of the orifice portion 22, but since the volume of the bellows 4 is extremely small compared to the cuff 3, the inside of the bellows 4 reaches atmospheric pressure before the inside of the cuff 3 reaches atmospheric pressure. . Here, the value indicated by the meter 24 of the pressure detection section 6 is read as atmospheric pressure for zero calibration, and the return switch 28 is turned on to continue measurement. In the same way, perform zero calibration for each measurement and repeat the measurement. The reason why the present invention has two solenoid valves, the three-way solenoid valve 2 and the two-way solenoid valve 21, is as follows. Blood pressure can be measured using only the electromagnetic valve 2, but without the electromagnetic valve 21, air escapes from the orifice portion 22 for slow evacuation when the cuff 3 is pressurized, making it impossible to pressurize the cuff 3 quickly. Furthermore, if a solenoid valve with a complicated structure is used, similar control can be achieved with a single solenoid valve, but a special solenoid valve must be manufactured, which increases the cost. However, if two solenoid valves are used, a commercially available three-way solenoid valve 2 and a two-way solenoid valve 21 can be used, resulting in lower costs.

In the present invention, as described above, the pump in the automatic sphygmomanometer main body and the electromagnetic valve consisting of a three-way valve are connected through a connecting pipe, the cuff and the above-mentioned connecting pipe are communicated through a cuff connecting pipe, and the above-mentioned The output side of the solenoid valve and the input side of the solenoid valve of the two-way valve are communicated through a communication pipe, and the pressure detection section equipped with a bellows and a differential transformer and the communication pipe between the solenoid valves are communicated through a branch pipe. Finally, a three-way solenoid valve is provided with an inlet on the input side, an outlet on the output side, and an atmosphere opening so that the inlet and the exhaust or atmosphere opening can be freely communicated by switching. An orifice part is provided on the outlet side of the solenoid valve of the three-way valve, and an orifice part is provided on the input side of the solenoid valve of the two-way valve. is sent and the pressure inside the cuff rises, the pressure is detected by the pressure detection part (at this time, the pressure without pressure fluctuation is transmitted to the pressure detection part at the orifice part on the discharge port side of the solenoid valve of the three-way valve, and the pressure is accurately measured. When the pressure inside the cuff reaches or exceeds the systolic blood pressure, the pump is stopped, the two-way solenoid valve is opened to the atmosphere, and the pressure gradually decreases through the orifice until the systolic blood pressure and minimum blood pressure are measured. Blood pressure is measured, and blood pressure can be measured accurately by gradually lowering the pressure. Moreover, the three-way solenoid valve has an inlet for input measurement, an outlet on the output side, and an atmospheric opening. Since the inlet and the outlet or the atmospheric opening can be freely switched to communicate with each other, after measuring the diastolic blood pressure, the solenoid valve of the three-way valve is switched to communicate the connecting pipe with the atmospheric opening, and the connecting pipe is connected with the atmospheric opening. It is possible to isolate the cuff from the cuff to atmospheric pressure in a short period of time, and the pressure sensing section can be brought to atmospheric pressure in a short period of time. Even if continuous measurements are to be taken, zero calibration is performed each time a measurement is started. and can accurately measure blood pressure.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of one embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the same as above, Fig. 3 is a longitudinal sectional view of Fig. 1, Fig. 4 is another longitudinal sectional view of Fig. 1, Fig. 5 is a piping diagram when the power is turned off in Fig. 2, FIG. 6 is a partially enlarged vertical sectional view of FIG. 2. In the figure, 1 is an automatic blood pressure monitor body, 2 is a three-way solenoid valve, 3 is a cuff, 4 is a bellows, 5 is a differential transformer, 6 is a pressure detection section, and 21 is a two-way solenoid valve.

Claims (1)

[Claims] 1 Connect the pump in the automatic blood pressure monitor main body to a solenoid valve consisting of a three-way valve through a connecting pipe, communicate the cuff with the connecting pipe through the cuff connecting pipe, and connect the output side of the solenoid valve with the two-way valve. The input side of the solenoid valve is connected to the input side of the three-way valve through a communication pipe, and the pressure detection section including a bellows and a differential transformer is connected to the communication pipe between the solenoid valves through a branch pipe. An inlet, an outlet on the output side, and an atmosphere opening are provided, and the inlet and outlet or atmosphere opening can be freely communicated by switching, and can be closed or opened to the atmosphere by switching the solenoid valve of the two-way valve. An automatic blood pressure monitor characterized in that an orifice part is provided on the discharge port side of a three-way solenoid valve, and an orifice part is provided on the input side of a two-way solenoid valve.