KR930010959B1 - Flow rate regulator for liquid medicine or blood transfusion unit - Google Patents

Abstract

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Description

Flow regulators for infusion sets or transfusion sets

1 is a cross-sectional view cut in the axial direction of the flow regulator constructed in accordance with one embodiment of the present invention.

Figure 2 is a perspective view of the eye in a state in which the flow regulator shown in FIG.

3 is a plan view of a first cylindrical member constituting the flow regulator of the present invention.

4 is a cross-sectional view of the first cylindrical member taken along the line a-a 'in FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flow rate regulator for attaching a fluid set, a blood transfusion set, or the like to adjust a flow rate of a chemical solution or blood. The invention also relates to a transfusion set or transfusion set into which this flow regulator is incorporated.

When using medical instruments, such as a transfusion set and a transfusion set, it is necessary to adjust the flow volume of the chemical liquid, blood, etc. which flow through a tub. For this reason, it is a well-known fact that the flow adjustment means is attached in the middle of a tub.

Various kinds of flow rate adjusting means of this kind have been known in the past, but a typical roller clamp is a simple and inexpensive means. This roller clamp consists of a main body and a roller attached to the main body so as to be movable, and the tubing is inserted between the outer peripheral surface of the roller and the bottom surface of the main body having an inclination of the equator, and the tubing is moved by moving the roller. The flow rate of the liquid is adjusted by varying the degree of fitting the web.

As described above, it has been found that the shape of the constriction portion of the tubing changes over time with respect to the roller clamp, and as a result, the opening area of the tubing is small, so that the flow rate gradually decreases. Several improvements have been made to solve this problem. Among these improvements, one having a recessed V-shaped groove in the bottom surface of the main body is used. However, when this improved roller is used, it is pointed out as a problem that, over time, the change of the flow rate becomes considerably small at a constant temperature, but a large flow rate fluctuation occurs as in the conventional case with respect to the change in temperature.

In addition to the above-described roller clamp, examples of this type of flow regulator include those disclosed in U.S. Patent Nos. 3,877,428, 4,428,397, 4,769,012, and Japanese Patent Laid-Open No. 247,470 / 1986. Any of the flow rate regulators disclosed in the above-mentioned patent is configured by combining a plurality of members, and the flow rate regulator is adjusted by changing the cross-sectional area of the flow path. Any of the flow regulators disclosed in the U.S. patent has a complicated structure, and since the mold used for molding needs to be divided into molds, there is a drawback that the manufacturing cost, in particular, the cost required for manufacturing the mold, becomes high. What is disclosed in Japanese Laid-Open Patent is composed of only two members, but there is also a problem that the adjustment range of the flow rate is narrow and the adjustment accuracy is low. Therefore, nothing disclosed in these well-known patents is practical.

The present invention has been devised in view of the above background, and its object is not to involve the above-described drawbacks associated with conventional flow regulators, and an infusion set or blood set with little change due to changes in flow rate or temperature change over time. It is to provide a flow regulator used in.

It is another object of the present invention to provide a flow set or a flow regulator used for a transfusion set or a transfusion set, which can adjust the flow rate with high accuracy at the time of transfusion or transfusion.

Another object of the present invention is to provide a flow regulator for use in a transfusion set or transfusion set that is simple in structure and easy to manufacture.

In order to achieve the above object, the present invention is a flow regulator used in a transfusion set or a transfusion set, the first cylindrical member having a bottom portion and extends in the circumferential direction in which the cross-sectional area gradually changes to the first cylindrical member; A groove having a groove formed therein, the groove communicating with the liquid outlet through the through hole, a second cylindrical member adapted to rotatably fit the bottom portion and the first cylindrical member; A through hole communicating with the liquid inlet is formed in the second cylindrical member, and is rotatably fitted into the second cylindrical member, and at the bottom of the first cylindrical member. It is formed in the second cylindrical member while communicating with a cylindrical member adapted to be in pressure contact with the part and a circumferential groove formed in the bottom portion of the first cylindrical member in the disk member. It is to provide a flow regulator which is formed by forming a through hole communicating with a through hole.

According to a preferred embodiment of the present invention, the bottom of the first cylindrical member is arranged so that the liquid inlets at the second cylindrical member and the outlets at the first cylindrical member are arranged in line in the axial direction. A groove for communicating one end of the cylindrical groove formed in the portion with the through hole is formed in the bottom portion of the first cylindrical member, and the through hole formed in the disc shaped member is formed in the through hole formed in the second cylindrical member. The groove to communicate with is formed in the surface on the opposite side to a circumferential groove.

Grooves for communication formed in the first cylindrical member unless particularly required to have a liquid inlet in the second cylindrical member and an outlet in the first cylindrical member centered in the axial center of the regulator. And the groove | channel for the communication formed in the disk-shaped member is not needed.

The flow of the liquid can be stopped by providing a circumferential groove and a stop formed in the first cylindrical member, and placing a through hole formed in the disc-shaped member in the stop.

Both the first cylindrical member, the second cylindrical member, and the disc-shaped member are molded from a plastic material, and the disc-shaped member is formed so as to contact the disc-shaped member to the bottom of the first cylindrical member. It is preferable to mold using a plastic material having a high elasticity.

The present invention also provides a transfusion set or transfusion set into which the above-described flow regulator is incorporated.

In order to remove fine foreign matter in the chemical liquid or blood, it is preferable that a filter is attached upstream of the flow regulator.

These and other objects, features and advantages of the present invention will be readily understood from the following detailed description.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings which illustrate preferred embodiments of the present invention.

In the flow regulator according to the present invention, the first cylindrical member A, the disk-like member B, and the second cylindrical member are constituted by the member C. FIG. The first cylindrical member A is provided with a bottom portion 19, and the bottom portion 19 is formed with a groove 21 extending in a circumferential direction with a V-shaped cross section. As seen from FIG. 3, the grooves 21 gradually increase in width and depth from the starting point 25 toward the end point 24. Therefore, the cross-sectional area of the groove 21 is gradually increasing. The groove 21 communicates with the groove 23 formed in the bottom portion 19 having a cross-sectional area equal to or greater than the cross-sectional area of the groove 21 through the end point 24 having the largest cross-sectional area. The groove 23 extends toward the center of the bottom portion 19 and communicates with the through hole 20 formed in the center of the first cylindrical member A. FIG.

Although the through-hole 18 is formed also in the cylindrical member B, when the 1st cylindrical member A and the disk-shaped member B are assembled, the said through-hole 18 is the groove | channel 21. The through hole 18 is positioned to coincide with. In this way, the sap first flows from the through hole 18 formed in the disc-shaped member B to the thin portion of the groove 21, and then the thick portion of the groove 21 is thicker. Flow towards the part. Therefore, the part of the groove 21 in which the through-hole 18 is located has a minimum cross-sectional area of the whole fluid flow path, and the minimum flow volume is limited by this. By rotating the first cylindrical member A with the user's hand, the flow rate increases as the through hole 18 approaches the end point 24 of the groove 21, and the closer to the opposite time point 25. Decreases. While the through hole 18 is located at the portion where the groove is not formed in the first cylindrical member A, the flow of the liquid is interrupted.

As shown in FIG. 1, the groove 17 is formed in the upper surface of the disc-shaped member B, and this groove 17 extends toward the center of the member B in the through hole 18. As shown in FIG. As can be seen from FIG. 2, the notch 16 is formed on the upper surface of the member B. As shown in FIG.

The through hole 15 is formed in the center of the bottom surface 13 of the second cylindrical member C, and the projection 12 is formed at the position corresponding to the notch 16 in the disk-like member B. Is formed.

The projection 12 of the second cylindrical member C and the notch 16 of the disk-like member B are provided so that the member B and the member C do not rotate relatively. The present invention is not limited to the above configuration, and other fixing means may be adopted as long as it is suitable for the present purpose.

The three members (A), (B), and (C) configured as described above fit the member B into the inside of the member C, and then the member C into the inside of the member A. It is assembled sequentially by inserting. In the illustrated embodiment, a ring-shaped protrusion 22 is provided on the inner circumferential surface of the member A, and a ring-shaped groove 14 is formed on the outer circumferential surface of the member C, so that the protrusion 22 is grooved. Both parts are rotatably assembled. In addition, the positional relationship between the ring-shaped protrusion 22 and the ring-shaped groove 14 must be set such that the member B is pressed against the bottom surface of the member A by the member C. As the material of the member B, it is preferable to use a material having elasticity such as plasticization, polyvinyl chloride, polyurethane, silicone rubber or the like, rather than being solid.

The operation of the flow regulator configured as described above will be described.

The sap is introduced at the inlet 11 of the member C, through the through-hole 15 of the member C, the groove 17 and the through-hole 18 of the member B, and further through the member A. It is discharged from the outlet 26 through the grooves 21 and 23 and the through hole 20. The flow rate is adjusted by rotating the member C relative to the member A. FIG. That is, since the member C and the member B rotate integrally with each other, the positional relationship between the through hole 18 of the member B and the groove 21 of the member A by rotating the member C is rotated. Is changed and the cross-sectional area of the groove 21 is changed by this, so that the flow rate can be adjusted to the required value. If graduations are attached to the members A and C, this graduation can be used as a target for setting the flow rate.

In the above-described embodiment, the groove 17 and the groove 23 are formed to position the inlet 11 and the outlet 26 of the liquid at the center of the regulator. Therefore, when the inlet 11 and the through hole 15 are positioned in the through hole 18 and the outlet 26 and the through hole 20 are positioned at the end point 24 of the groove 23, the groove ( 17 and the groove 23 do not need to be formed. In addition, the method of fitting the member A and the member C is not limited to the above-mentioned structure. If it is appropriate, other methods may be employed.

Generally, a transfusion set or a transfusion set is composed of a needle, a drop, a venous needle, and a tube connected thereto. And the position where the flow regulator which concerns on this invention is integrated is suitable for the upper part or the lower part of a drop container. The flow regulator and the dropping tube may be integrated, or the flow regulator may be provided in the middle of the infusion or transfusion circuit. If foreign matter is blocked in the flow rate regulator of the flow rate regulator, the flow rate fluctuates, so it is preferable to install a filter upstream of the flow rate regulator to remove the foreign matter. Particularly in the case of the infusion set, when the rubber wire of the infusion bottle is cut off by the needle needle, fine particles may be generated and mixed in the infusion solution. Therefore, it is preferable to provide a filter. In order to prevent foreign matter from entering the body, a filter is sometimes incorporated into a fluid set or a blood set, but it is possible to save the number of parts by using the above filter for this filter. It is appropriate to set the diameter of the small hole of the filter within the range of 0.1 to 30 microns.

In order to facilitate the understanding of the characteristics of the flow regulator according to the present invention, the results obtained by testing the infusion set using the same will be described.

The members (A) and (C) are molded from ABS resin, the members B are molded from plasticized polyvinyl chloride, and these members are assembled as described above, and a flow regulator configured to be inserted into the infusion set, The change in flow rate over time was observed by flowing tap water in a drop of 65 cm while changing within the range from 5 ° C to 40 ° C. For comparison, the same test was conducted using a roller clamp having a V-shaped groove widely used as a roller clamp having a small flow rate change. The test results are shown in Table 1.

TABLE 1

As can be seen from Table 1, the flow rate controller of the present invention did not change much with respect to the ambient temperature change, but the flow rate of the roller clamp was greatly changed in response to the change of temperature.

In addition, it is easily understood that the flow rate can be kept in an extremely stable state by incorporating a filter in front of the flow regulator.

Although the present invention has been described with reference to the preferred embodiments of the present invention, it will be apparent that appropriate changes or modifications may be made to the present invention without departing from the scope thereof.

Claims (9)

A flow regulator used for an infusion set or a transfusion set, comprising a first cylindrical member having a bottom portion and a groove extending in a circumferential direction in which the cross-sectional area gradually changes in the first cylindrical member, and the groove is formed. A second cylindrical member which communicates with the liquid outlet through the through hole, which has a bottom portion and is rotatably fitted with the first cylindrical member, and a liquid inlet to the second cylindrical member. A through hole communicating with the cylindrical member, the cylindrical hole being adapted to be rotatably fitted into the second cylindrical member and pressed against the bottom of the first cylindrical member. A through hole communicating with the member and a cylindrical groove formed in the bottom of the first cylindrical member and communicating with the through hole formed in the second cylindrical member in the disk-like member. Flow regulator, characterized in that consisting of. 2. A groove according to claim 1, wherein a groove for communicating one end of the cylindrical groove formed in the bottom portion of the first cylindrical member with the through hole is formed in the bottom portion of the first cylindrical member. Flow regulator. The flow regulator according to claim 1, wherein a groove for communicating the through hole formed in the disc-shaped member with the through hole formed in the second cylindrical member is formed on the surface opposite to the circumferential groove. 2. The flow of liquid is prevented while the circumferential groove formed in the first cylindrical member has a stop, and the through hole formed in the disc-shaped member is located in the stop. Flow regulator. The ring-shaped projection is provided on the inner circumferential surface of the first cylindrical member so as to rotatably fit the second cylindrical member to the inside of the first cylindrical member. And a ring-shaped groove is recessed on an outer circumferential surface of the second cylindrical member, and the ring-shaped protrusion is fitted into the ring-shaped groove. The disk-shaped member is provided with a notch, in order to rotatably fit the disk-like member to the second cylindrical member, and the above-mentioned inside of the second cylindrical member. And a projection corresponding to the notch, wherein the projection is engaged with the notch. 2. The first cylindrical member, the second cylindrical member, and the disk-shaped member are each molded from a plastic material, and the disk-shaped member is bottomed from the first cylindrical member. The disk-like member is molded from a highly elastic plastic material so as to be in contact with the portion. A transfusion set or transfusion set using the flow controller according to any one of claims 1 to 7, wherein the flow regulator is incorporated. A transfusion set or transfusion set using the flow regulator according to any one of claims 1 to 7, wherein a transfusion set or transfusion set is attached to an upstream of the flow regulator.

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