JPH052195Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flow rate regulator for regulating the flow of medicinal solutions, blood, and the like.

[Conventional technology]

BACKGROUND ART In infusion sets, blood transfusion sets, and other medical instruments, it is necessary to adjust the flow rate of a drug solution, blood, or the like flowing inside a tube. It is well known that flow rate regulators are installed in the middle of these tubes for this purpose.

Various types of flow rate regulators have been known in the past, and a typical example is a roll clamp. This roll clamp generally consists of a main body and a roll movably attached to the main body, and a tube is sandwiched between the circumferential surface of the roll and the moderately sloped bottom of the main body. By moving the rolls, the cross-sectional area of the tube was changed to adjust the flow rate of the liquid.

In addition to the method of adjusting the flow rate by sandwiching a tube, there is also a flow rate regulator that adjusts the flow rate by changing the cross-sectional area of the flow path by combining two or more hard members. Publication, Japanese Unexamined Patent Publication No. 1987-
Many proposals have been made, such as in Publication No. 203451 and Japanese Unexamined Patent Publication No. 149161/1983. Furthermore, as in the present invention, a clamp using slits with varying effective cross-sectional areas has also been proposed in Japanese Patent Laid-Open No. 61-247470.

[The problem that the idea aims to solve]

However, with this roll clamp, since the tube is made of flexible plastic, there is a problem in that the cross-sectional area of the pressed tube changes over time due to its characteristics, and the flow rate also changes accordingly. For this reason, several improvements have been attempted, such as those in which the bottom surface of the main body is rounded or grooves are formed in the length direction of the bottom surface of the main body.

However, these methods share the same basic principle of sandwiching a soft plastic tube, and it is inevitable that the flow rate will fluctuate depending on the characteristics of the plastic.

Further, in order to eliminate such drawbacks, many flow rate regulators have been proposed that adjust the flow rate by changing the cross-sectional area of the flow path by combining hard members, but all of them have had problems in terms of cost.

In addition, as in the present invention, a clamp using slits with varying effective cross-sectional areas (Japanese Patent Laid-Open No. 61-247470)
Also, since the molding mold has to be split into a split mold, there are problems in that it is not possible to use a multi-cavity mold, the mold production cost is high, and the service life is short, which increases the cost.

The purpose of this invention is to solve the above-mentioned problems of conventional clamps.

[Means to solve the problem]

In order to achieve this purpose, this invention has the following structure. That is, the flow rate regulator according to this invention is a flow rate regulator for regulating the flow of liquids such as infusions and blood, and includes a cylindrical member A having a bottom and a rotatably fitted inside of the member A. The member B is composed of a disc-shaped member B, and the member B
A hole penetrating through the front and back sides is provided to form a liquid inlet, a hole penetrating through the front and back sides is also provided at the bottom of member A to form a liquid outlet, and a hole at the bottom of member A that is in close contact with member B is formed. Forms a circumferential groove whose effective cross-sectional area gradually increases from one end to the other around a position that coincides with the rotation axis of member B, and the liquid introduction port communicates with the circumferential groove. At the same time, the liquid outlet is connected to the end of the circumferential groove which has a larger effective cross-sectional area, and the liquid outlet is connected to the end of the circumferential groove where the effective cross-sectional area is larger.
The present invention is characterized in that the flow rate is adjusted by mutually rotating the flow rate and changing the position of the circumferential groove in the portion where the liquid inlet communicates.

[Effect]

The liquid introduced into the disc-shaped member B from the liquid inlet passes through the inside of the member B, reaches the side that contacts the cylindrical member A, and flows into the circumferential groove provided in the cylindrical member A, thereby increasing the effectiveness of the groove. The liquid flows in the direction of increasing cross-sectional area and reaches the liquid outlet. At this time, among the parts of the circumferential groove through which the liquid flows, the part where the liquid inlet is located has the smallest effective cross-sectional area, so the flow rate is regulated in this part. Therefore, the flow rate can be adjusted by mutually rotating the cylindrical member A and the disc-shaped member B and changing the position of the circumferential groove in which the liquid inlet is located.

〔Example〕

An embodiment of this invention will be described with reference to the drawings.

Fig. 1 is a sectional view of the flow rate regulator of the present invention, Fig. 2 is a diffusion exploded view of Fig. 1, Fig. 3 is a plan view of the cylindrical member A, and Fig. 4 is a-a of Fig. 3. 'It is a sectional view.

The cylindrical member A has a bottom, and on the inner surface of the bottom,
A circumferential groove 6 is formed in which the effective cross-sectional area gradually increases from one end to the other. The end portion with a larger effective cross-sectional area is connected to the groove 3.
The groove 3 is a liquid outlet 5 passing through the bottom of the cylindrical member A.
It is necessary to provide communication between the liquid outlet and the circumferential groove, and to reduce the movement of the liquid outlet when the cylindrical member A is rotated by providing the liquid outlet in the center of the cylindrical member A. It is something. Therefore, if the liquid outlet is directly connected to the circumferential groove, it becomes unnecessary, and the present invention includes such an embodiment.

Further, the disc-shaped member B is formed with a liquid introduction port 4 that penetrates the disc-shaped member B, and the liquid introduction port 4 is connected to the circumferential groove on the surface that is in close contact with the bottom inner surface of the cylindrical member A. It penetrates from the position where it is provided to the opposite surface.
Then, the protrusion 2 provided on the cylindrical member A is inserted into the outer circumferential groove 1 provided on the disc-like member B to form an engaged part, and the disc-like member B is prevented from coming out from the cylindrical member A. Preventing. Furthermore, this insertion portion or the close contact portion between the cylindrical member A and the disc-shaped member B has a liquid-tight structure. At this time, it is preferable to set the position of the insertion portion so as to compress the disc-shaped member B, since liquid-tightness between the cylindrical member A and the disc-shaped member B can be easily ensured.

Next, an example of the use of the above-mentioned embodiment will be described. First, a liquid such as a chemical solution flows in from one end of the liquid introduction port 4, passes through the inside of the disc-shaped member B, and reaches the other end, and the liquid such as a chemical solution flows into the cylindrical member connected to this. The liquid reaches one end of the liquid outlet 5 through the circumferential groove 6 and the groove 3 of the member A, passes through the interior of the cylindrical member B, and flows out from the other end. This outflow amount depends on the size (effective cross-sectional area) of the circumferential groove portion of the cylindrical member A that communicates with the liquid introduction port 4. This is because this part of the circumferential groove through which the liquid flows has the smallest effective cross-sectional area, so the flow of the liquid is restricted in this part. Therefore, by relatively rotating the cylindrical member A and the disc-shaped member B, the flow rate can be adjusted. Naturally, the outflow of the liquid can also be stopped by moving the rotational position and positioning the liquid inlet in a portion where the circumferential groove is not formed.

The sizes of the circumferential groove 6 and the liquid outlet 5 provided in the cylindrical member A, and the liquid inlet 4 of the disc-shaped member B are arbitrarily selected so as to obtain a desired flow rate.

[Effect of idea]

According to the flow rate regulator according to this invention, the flow rate of liquid is not controlled by sandwiching a tube as in conventional roll clamps, but by controlling the mutual rotational positions of the cylindrical member and the disc-shaped member. Since the flow rate of liquid from the housing is directly controlled by changing the opening area of the flow path, the flow rate of infusions, etc. can be maintained with high precision from beginning to end, eliminating the need for repeated readjustments midway through the process as in the past. Become.

Furthermore, compared to conventional flow rate regulators that combine two or more hard members to adjust the flow rate by changing the cross-sectional area of the flow path, the number of component parts is reduced, and it can be manufactured at low cost. Furthermore, as in the present invention, a clamp using slits with varying effective cross-sectional areas (Japanese Patent Laid-Open No. 61-247470)
Even compared to the above, there is no need to use split molds for the molding, so the cost can be reduced.

[Brief explanation of the drawing]

Fig. 1...A sectional view showing an embodiment of the present invention, Fig. 2
Figures: an exploded diffusion view of Figure 1; Figure 3: a plan view of the cylindrical upper member A; Figure 4: a sectional view taken along line a-a' in Figure 3; 1...Outer circumferential groove, 2...Protrusion, 3...Groove, 4...
...Liquid inlet, 5...Liquid outlet, 6...Circumferential groove, A
... Cylindrical member, B... Disc-shaped member.

Claims (1)

[Scope of utility model registration request] A flow rate regulator for regulating the flow of liquids such as infusions and blood, which is composed of a cylindrical member A having a bottom and a disc-shaped member B rotatably fitted inside member A. A hole penetrating through the front and back sides is provided in member B to form a liquid inlet port 4, a hole penetrating through the front and back sides is also provided at the bottom of member A to form a liquid outlet port 5, and a hole penetrating through the bottom of member A is also provided to form a liquid outlet port 5. A circumferential groove 6 having an effective cross-sectional area gradually increasing from one end to the other end is formed on the surface in close contact with member B, and the groove 6 has a circumferential groove 6 whose effective cross-sectional area gradually increases from one end to the other end with the center at a position that coincides with the rotation axis of member B. 4 is provided at a position that communicates with the circumferential groove 6, and the liquid outlet 5 is communicated with the end of the circumferential groove 6 that has a larger effective cross-sectional area, so that member A and member B are mutually connected. 2. A flow rate regulator, characterized in that the flow rate is adjusted by rotating the device to change the position of a circumferential groove 6 in a portion with which a liquid introduction port 4 communicates.