JPH0334164Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a slow exhaust valve for slowly exhausting pressurized air in a cuff in a blood pressure monitor.

(B) Prior art In general, various types of blood pressure monitors such as electronic blood pressure monitors wrap a cuff around the arm of the person to be measured, supply pressurized air to the cuff to ischemize the arm, and then apply the pressurized air to the cuff. Blood pressure is measured by exhausting air at a slow rate and detecting Korotkoff sounds. Therefore, the air system for supplying and exhausting pressurized air is provided with a slow exhaust valve of a cuff and a pump, so that the amount of exhaust is small and stable.

(c) Problems to be solved by the invention As shown in Fig. 4, the above-mentioned slow speed exhaust valve has the following problems:
A valve body c made of rubber is inserted into an air passage b of a case a, and this valve body c is a hollow body with a flange d at one end.
is formed and fitted into the case a, the other end is closed, and a slit e is formed, while a screw member f is screwed into the case a.
This screw member f is adapted to press the valve body c from the flange d side to open the slit e.
Pressurized air from the cuff passes through the slit e and is exhausted from the inside of the valve body c through the communication hole g of the screw member f.

However, in this slow exhaust valve, since the slit e of the valve body c is opened by the pressing force of the screw member f, the opening amount is indirectly adjusted. Therefore, due to variations in the length, shape, etc. of the slit e, the exhaust characteristics change, the decompression speed of the cuff changes, and there is a drawback that stability is lacking.

(d) Means and action for solving the problem In this invention, a case is interposed in the air system, a valve body is inserted into the air passage inside the case, and the valve body is made of an elastic body. It consists of a thick-walled support part that fits into the support part, and a thin-walled adjustment part that is connected to the support part and has a smaller diameter than the communication path.The valve body is formed as a hollow part, and one end of this hollow part is connected to the support part A slit is formed in the adjustment part in the longitudinal direction, and a cylindrical member is inserted into the hollow part. A flange is formed at one end of the cylindrical member, and a protrusion is formed at the other end of the cylindrical member. It is inserted into the slit and the flange is pressed against the valve body by a pressing member, and the opening amount of the slit changes in size depending on the exhaust pressure, so that the exhaust amount per time is kept constant.

(E) Embodiment Hereinafter, an embodiment of this invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 3, reference numeral 1 denotes a slow exhaust valve provided in the air system of the blood pressure monitor, which slowly exhausts the pressurized air in the cuff.

The slow exhaust valve 1 is composed of a case 2, a valve body 3, a cylindrical member 4, and a pressing member 5. The case 2 has an air passage 2 formed in a cylindrical shape and open at both ends.
A is drilled. Inside the case 2, there is a small diameter part 2b, a large diameter part 2c, and a threaded part 2d from the wristband side.
are formed in sequence.

The valve body 3 is made of an elastic body such as rubber, and the support part 3
A and the adjustment part 3b form a cylindrical shape, and the inside is a hollow part 3c. The support portion 3a is formed thick and is adapted to fit into the large diameter portion 2c of the case 2. The adjustment part 3b is formed thin, is connected to a part of the support part 3a, and is formed to have a slightly smaller diameter than the small diameter part 2b of the case 2. One end of the hollow part 3c is open at the end surface of the support part 3a, and the adjusting part 3b side is closed. Further, two slits 3d are formed in the adjustment part 3b in the longitudinal direction, so that the hollow part 3c and the outside communicate with each other. This valve body 3 is inserted into the air passage 2a, and the adjustment part 3b is located on the arm cuff side.

The cylinder member 4 is inserted into the hollow part 3b of the valve body 3,
It is formed into a cylindrical shape. This cylindrical member 4 has a communication hole 4a opened at both ends, a flange 4b at one end, and a protrusion 4c at the other end. The flange 4b is in contact with the end surface of the support portion 3a, and two protrusions 4c are provided so as to be inserted into the slit 3d.

The pressing member 5 has a threaded portion 5a that is screwed into the threaded portion 2d of the case 2, and a communication hole 5b that is continuous with the communication hole 4a of the cylindrical member 4 and is opened at both ends. This pressing member 5 has an inner end that is connected to the cylindrical member 4.
The flange 4b is pressed against the valve body 3. The outer end of the communication hole 5b of the pressing member 5 is open to the atmosphere.

Next, the operation of this slow exhaust valve 1 will be explained.

First, pressurized air is supplied to the arm cuff to isolate blood from the arm of the person to be measured, and then a slow exhaust is performed.

In this slow exhaust valve 1, a cylindrical member 4 is inserted into a valve body 3, and a protrusion 4c is inserted into a slit 3d to open the slit 3d (see FIG. 3). The projection 4c moves toward the center of the slit 3d in accordance with the pressing force of the pressing member 5, and the opening amount of the slit 3d is adjusted to a large extent. Moreover, since this cylindrical member 4 is pressed against the valve body 3 by the pressing member 5,
When the pressing member 5 is loosened, it is pushed back by the repulsive force and returns to its original position.

Therefore, when exhausting at a slow speed, the pressurized air in the wristband passes through the air passage 2a of the case 2 from the right end in FIG. 1, passes through the slit 3d, and flows into the hollow part 3b.
It is exhausted to the atmosphere through the communication holes 4a and 5b of the cylindrical member 4 and the pressing member 5.

Since the slit 3d is opened by the protrusion 4c, stable evacuation is performed, and the opening amount changes in accordance with the air pressure. In other words, if the pressure inside the cuff is high, the adjustment part 3b
is pressed from the outside, and the opening amount of the slit 3d becomes smaller; conversely, when it becomes lower, the pressing force becomes smaller, the opening amount becomes larger, the evacuation amount becomes constant, and the decompression in the cuff is carried out at a constant speed.

During this slow evacuation, Korotkoff sounds and the like are detected and blood pressure is measured.

In this embodiment, two slits 3d are formed, but the invention is not limited to two.

(f) Effects of the invention As described above, according to the slow exhaust valve of the blood pressure monitor of this invention, the protrusion of the cylindrical member is inserted into the slit formed in the valve body to forcefully open the valve. Since the opening amount of the slit can always be kept constant, stable exhaust characteristics can be obtained. Furthermore, the opening amount of the slit automatically changes depending on the exhaust pressure, and becomes smaller when the pressure is high and becomes larger when the pressure is low, so that the exhaust amount is always constant and the depressurization speed can be kept constant.

Further, since the cylindrical member is pressed by a separate pressing member, rotational moment etc. are not transmitted to the protrusion, and a stable opening amount can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention, with Figure 1 being a longitudinal sectional view of the slow exhaust valve, and Figure 2 being a plan view of the valve body and cylinder member before inserting the protrusion into the slit. 3 is a plan view showing a state in which the protrusion is inserted into the slit, and FIG. 4 is a longitudinal sectional view showing a conventional slow speed exhaust valve. 1: slow exhaust valve, 2: case, 2a: air path,
3: Valve body, 3a: Support part, 3b: Adjustment part, 3c:
Hollow part, 3d: slit, 4: cylindrical member, 4b: flange, 4c: protrusion, 5: pressing member.

Claims (1)

[Scope of Claim for Utility Model Registration] A blood pressure monitor that supplies pressurized air to a cuff from an air system and exhausts this pressurized air at a slow rate to measure blood pressure, in which a case is interposed in the air system, and this case A valve body is inserted into the air passage inside, and this valve body is made of an elastic body and consists of a thick support part that fits into the case, and a thin adjustment part that is connected to this support part and has a smaller diameter than the communication path. At the same time, the valve body is formed into a hollow part, one end of the hollow part is opened at the end face of the support part, a slit is formed in the longitudinal direction in the adjustment part, and a cylindrical member is inserted into the hollow part. A flange is formed at one end of this cylindrical member and a protrusion is formed at the other end, the protrusion is inserted into the slit, and the flange is pressed against the valve body by a pressing member, and the opening amount of the slit is adjusted according to the exhaust pressure. A slow exhaust valve in a blood pressure monitor characterized by variable speed.