JPS6243535Y2 - - Google Patents

Description

[Detailed description of the invention] This invention periodically changes the volume of the air chamber, so that when air is forced into the cuff connected to the exhaust side, even when the relative pressure inside the cuff is high, The present invention relates to a blood pressure monitor pump suitable for use when it is necessary to drive a diaphragm with starting torque.

Conventional sphygmomanometers that have a built-in pump inside the main body for automatic pressurization generally use a diaphragm-type pump and a small motor as a driving source. However, since the maximum measured pressure is approximately 300 mmHg, reprocessing near the maximum measured pressure requires the use of a motor with large starting torque and high power consumption. There are various drawbacks to using batteries as a power source in terms of rated voltage and battery life. Furthermore, although the commonly used pressure range is 200mmHg or less, 300mmHg or less
In order to ensure re-applying force around mmHg, a larger motor than necessary had to be used, which had the disadvantage of making it larger than the main body of the blood pressure monitor.

The purpose of this invention is to make the motor smaller so that even when the relative pressure on the load side increases, the motor does not require a large starting torque, and that there are no problems in terms of voltage and life even when the motor is powered by a battery. The purpose of the present invention is to provide a blood pressure monitor pump that can use a motor.

This invention does not force the entire amount of air supplied by the diaphragm pump to the arm cuff through the valve body on the exhaust side, but instead pumps a small amount of air that does not affect the amount of air delivered to the arm cuff directly from the air chamber to the outside. By configuring the pump to allow leakage to the pump, the starting torque required for the motor is minimized even when repressurization is performed with the relative pressure inside the cuff connected to the exhaust side increasing. It was designed to look like this.

The present invention will be explained below according to one embodiment. 1st
The figure shows a top view of the overall configuration of a diaphragm type blood pressure monitor pump employing the present invention. Diaphragm 1
The eccentric pin 6 attached to the shaft of the motor 7 is inserted into the eccentric pin insertion portion 9 (FIG. 2). The diaphragm 1 is held between the base 2 and the cover 3, and the cover 3 is attached to the base 2 by the cover mounting screw 20.
installed on. Similarly, the motor 7 is also fixed to the base 2 with a motor support plate 8.

FIG. 2 shows a top view of the diaphragm 1. In this embodiment, the diaphragm part and the exhaust side valve body 1
1. A case is shown in which a diaphragm formed of an elastic body integrally formed with the intake side valve body 13 is used.

FIG. 3 shows a top view of the base 2 employing the present invention. As shown in the figure, a convex portion 19 of about 0.2 mm to 0.3 mm is provided on a portion of the surface of the base 2 that is in close contact with the intake side valve body support portion 12 of the diaphragm 1 (see FIG. 5).

FIG. 4 shows the AA cross section shown in the first section. The volume of the air chamber 14 is changed by converting the rotation of the motor 7 into vertical movement by the eccentric pin 6 and moving the eccentric pin insertion part 9 up and down. When the eccentric pin insertion part 9 is pulled upward, the volume of the air chamber 14 increases and becomes negative pressure, so that the intake valve body 13
is drawn toward the base 2 side, and the outside air is sucked into the air chamber 14 through the intake hole 5, the intake side recess 18, and the intake side communication groove 17.

Next, when the eccentric pin 9 is pushed down and the inside of the air chamber 14 becomes positive pressure, the air is discharged from the exhaust side communication groove 15 (third
Exhaust side valve body 11 passed through (Fig.) and pushed upward
From the gap between the base 2 and the exhaust side recess 16 (Fig. 3)
It passes through the exhaust hole 4 (FIG. 1) and is pumped to a cuff (not shown) connected to the exhaust side. Of course, at this time, the intake side valve body 13 is in close contact with the back surface of the cover 3, and there is no leakage from the intake side.

In a blood pressure monitor pump configured in this way, the pressure inside the cuff gradually increases, but when the motor stops rotating and blood pressure measurement begins, the pressure has already reached K. If the sound is heard, it is necessary to repressurize. At this time, the same pressure as in the arm cuff is built up in the exhaust side valve body 11,
The higher the pressure within the cuff, the greater the force required to push down the eccentric pin insertion portion 9 and pump the air, and the greater the starting torque of the motor 7 when repressurizing.

In such a case, as shown in FIGS. 4 and 6, when the diaphragm 2 made of an elastic material is brought into close contact with the convex part 19 formed on the upper surface of the base 2, the back surface of the diaphragm 2 will conform to the shape of the convex part 19. At this time, a small triangular gap 21 is formed at the end of the convex portion 19, and a small portion of the air to be pumped can leak from this gap 21. Therefore, the pressure in the air chamber 14 before stopping has increased to the same level as the pressure on the load side, but once the rotation of the motor 7 is once stopped, air leaks from the gap 21 and the pressure is gradually reduced.

Next time when restarting the motor 7, the air chamber 14
If the internal pressure is equal to the pressure on the load side, it will be difficult to start up and a large current will be temporarily required, but according to this embodiment, since the pressure is reduced due to leakage, the start-up is performed smoothly. Particularly in this type of device, which converts the rotational force of a motor to drive a reciprocating diaphragm, it is difficult to start, and the influence from the load must be reduced as much as possible. This embodiment is advantageous in this respect. Air chamber 1 after driving
When the 4 pressure exceeds the load side pressure, the exhaust side valve 11 opens and closes, allowing air to be sent to the load. The amount of air leaked is less than 1/10 of the amount of air pumped to the load on the exhaust side, so if you take into account the amount of change in the volume of the air chamber in advance, it will have almost no effect on the amount of air sent to the load. I won't give it. Furthermore, when pressurization is stopped, the exhaust side valve body 11 acts as a check valve, so air does not flow back from the load side to the air chamber 14, and therefore the above-mentioned gap 2
There is no possibility of air leaking to the outside from 1.

According to the above configuration, there is no need to increase the starting torque of the motor unnecessarily even when repressurizing from around 300 mmHg, and there is no need to worry about air leaking from the arm cuff side after pressurizing is finished. . Further, since the gap 21 for leakage utilizes the space formed between the convex portion provided on the base 2 and the diaphragm 2, no separate parts are required, resulting in a simple and inexpensive configuration.

In the embodiment described above, a pump in which the diaphragm and the valve body are integrally molded is shown, but the pump is not limited to this, and even if the valve body is formed separately from the diaphragm, the above-mentioned effects will still be obtained. Nothing will change. Further, in this embodiment, the communication portion with the air chamber has a groove shape, but the communication portion is not limited to this. Furthermore, it is clear that the positional relationship and shape of the intake and exhaust valve bodies, the driving method of the diaphragm, etc. are not limited to these. In addition, the position and height of the convex portion 19 provided on the base 2,
The shape is not limited to this embodiment as long as it allows air to leak from the air chamber 14 to the outside and at the same time does not affect the air supply to the load side.

According to the present invention, even if the relative pressure of the load connected to the exhaust side increases, a large starting torque is not required when repressurizing, so a small motor that can be sufficiently driven by battery power is used as a blood pressure monitor. It can be used as a drive source for a medical pump, and has the effect that an automatic pressurization type blood pressure monitor can be used in any location.

[Brief explanation of the drawing]

Fig. 1 is a top view illustrating the overall configuration of a diaphragm pump according to an embodiment of the present invention, Fig. 2 is a top view of a single diaphragm, and Fig. 3 is a partial top view of the base of an embodiment of the present invention. Figure 4 is A-A in Figure 1.
FIG. 5 is a perspective view of the base of the same embodiment, and FIG. 6 is a partial cross-sectional perspective view showing a diaphragm attached to the base. 1...Diaphragm, 2...Base, 3...Cover, 5...Intake hole, 7...Motor, 12...
Intake side valve body support part, 13...Intake side valve body, 14...
...Air chamber, 17...Intake side communication groove, 18...Intake side recess, 19...Base protrusion, 21...Leak gap.

Claims (1)

[Scope of utility model registration request] A diaphragm made of an elastic body that performs a pressurizing action by periodically changing the volume of the air chamber, and a valve body on the exhaust side and a valve body on the intake side, both made of elastic bodies, are brought into close contact with each other to close the air chamber. a base that forms a communication section between the air chamber and the valve bodies on the exhaust side and the intake side; a cover for bringing the diaphragm and the valve body into close contact with the base; and a cover that periodically changes the volume of the air chamber. In a sphygmomanometer pump equipped with a small motor for diaphragm, the diaphragm is used as a base, and when the cover is in close contact with the air chamber, other than the valve bodies on the exhaust side and intake side, the air chamber is always in communication with the outside air. A blood pressure monitor pump characterized by being configured so that a minute gap is formed.