JPH0847541A - Connector for liquid injecting container - Google Patents

Abstract

PURPOSE:To obtain a connector for a liquid injecting container capable of surely connecting the container to a hollow tube without inducing liquid leakage even if burrs exist on the outer peripheral surface side of the cylindrical discharge part of the container. CONSTITUTION:This connector has a first cylindrical juncture having an outer peripheral surface held in tight contact with the inner peripheral surface of the cylindrical discharge part 13 and a second cylindrical juncture having an inner peripheral surface held in tight contact with the outer peripheral surface of the cylindrical discharge part 13 at the time of connecting the cylindrical discharge part 13 of the container 12 and the hollow tube 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector of a liquid injecting container used for injecting a liquid medicine such as an enema drug or a contrast agent, and particularly to connecting a liquid container and a hollow tube. The present invention relates to a connector for improving the connection structure with a container containing a liquid.

[0002]

2. Description of the Related Art Conventionally, various liquid injection container systems for injecting a drug solution such as an enema drug and a contrast agent into a body or a blood vessel have been proposed (for example, Japanese Utility Model Laid-Open No. 5-24047).

An example of the above liquid injection container is shown in FIG.
Will be described with reference to. The liquid injection container system 1 has a container 2 that stores a liquid medicine. The container 2 is a tubular discharge part 3 for discharging the liquid when injecting the liquid into the body.
Have. The container 2 is made of a synthetic resin material that is soft enough to be squeezed. On the other hand, a hollow tube 4 having an injection portion into the body on the tip side (not shown) is connected to the cylindrical discharge portion 3 of the container 2. Further, in order to prevent the liquid inside from leaking before the liquid is injected, the easily rupturable film 3 is provided at the tip 3a of the cylindrical discharge portion 3.
a is attached.

The hollow tube 4 is not directly connected to the container 2 but is connected via a connector 5. This is because the container 2 and the hollow tube 4 are made of a relatively soft material, so that the liquid is prevented from leaking by connecting through the connector 5 having a certain degree of rigidity.

The connector 5 has a tubular connecting portion 6 into which the tubular discharge portion 3 of the container 2 is inserted, as shown in the sectional view of FIG. That is, the inner peripheral surface 6 a of the tubular connecting portion 6 is selected so that the inner diameter of the tubular connecting portion 6 can be in close contact with the outer peripheral surface of the tubular discharging portion 3 when the tubular discharging portion 3 is inserted. Has been.

On the other hand, a collar portion 7 is provided at the center,
A tubular connecting portion 8 is provided on the hollow tube connecting side of the collar portion 7. The hollow tube 4 is externally inserted on the outer side of the cylindrical connection portion 8. In that case, the outer diameter of the tubular connecting portion 8 is selected so that the inner circumferential surface of the hollow tube 4 is in close contact with the outer circumferential surface of the tubular connecting portion 8. Further, the collar portion 7 is provided to lock the tip of the hollow tube 4 in the connected state shown in FIG.

By the way, the conventional liquid injection container system 1
Then, the container 2 was often formed by blow molding. Therefore, burrs are apt to be generated on the cylindrical discharge portion 3 due to the mold mating surface. That is, burrs tending to extend outward at the tip of the tubular discharge portion 3 tend to occur. As a result, connector 5
When the tubular discharging portion 3 is inserted into the tubular connecting portion 6 of No. 2, a burr is present between the outer peripheral surface of the tubular discharging portion 3 and the inner peripheral surface 6a of the tubular connecting portion 6, and both There is a problem that the liquid tightness at the connection portion is lowered and liquid leakage occurs.

Therefore, conventionally, when the above-described burr exists, a method of melting the burr with heat or mechanically polishing it has been adopted. Therefore, there is a drawback that the manufacturing process is complicated because the above-mentioned processing must be performed after the container 2 is molded.

Further, in the method of melting the burr with heat, not only the burr but also the container 2 is likely to be deformed. Particularly, when the cylindrical discharge part 3 is deformed, the burr may be eliminated. Due to the deformation of the tubular discharge portion 3, the liquid tightness of the connecting portion with the connector 5 is deteriorated, and the liquid leakage from the connecting portion may occur. Further, even in the method of mechanically polishing and removing burrs, there is a drawback that polishing dust remains in the container 2.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional liquid injection container system, and connects the liquid injection container without causing liquid leakage even if burrs are present in the liquid injection container. An object is to provide a connector for a liquid injection container to be obtained.

[0011]

According to a first aspect of the present invention, a hollow tube is connected to a container containing a liquid to be injected and having a cylindrical discharge portion for injecting the liquid. It is a connector for a liquid injection container for performing. The connector of the present invention comprises: a first connecting portion having a peripheral surface whose portion connected to the cylindrical discharge portion is inserted into the inner peripheral surface of the cylindrical discharge portion so as to be in close contact with the inner peripheral surface; A second cylindrical connecting portion having an inner peripheral surface into which the cylindrical discharge portion is inserted and is brought into close contact with the outer peripheral surface of the cylindrical discharge portion.

That is, the liquid injection container connector of the present invention has the first and second cylindrical connecting portions so as to be in close contact with both sides of the outer peripheral surface and the inner peripheral surface of the cylindrical discharge portion of the container. It is characterized by

Further, preferably, as described in claim 2, the second tubular connecting portion is made longer than the first tubular connecting portion. Furthermore, in the connector for a liquid injection container of the present invention, in the portion to which the hollow tube is connected,
As described in (3) above, a third tubular connecting portion having an outer peripheral surface that is in close contact with the inner peripheral surface of the hollow tube may be configured. However, on the side connecting the hollow tube,
You may comprise the cylindrical connection part which has an inner peripheral surface contact | adhered to the outer peripheral surface of a hollow tube.

The material constituting the connector for a liquid injection container of the present invention is not particularly limited, but a material having excellent adhesion to the container to be connected is selected. For example, when the liquid injection container is made of polyethylene or the like, the connector for liquid injection container of the present invention is preferably made of synthetic resin such as polyethylene, polypropylene, hydrogenated styrene-butylene-styrene elastomer.

[0015]

According to the first aspect of the invention, the tubular discharge portion of the container is fitted into both the first and second tubular connection portions.
That is, the inner peripheral surface of the tubular discharge portion is in close contact with the outer peripheral surface of the first tubular connecting portion. Therefore, even if there is a burr on the outer side of the cylindrical discharge portion, the inner peripheral surface of the cylindrical discharge portion is surely brought into close contact with the outer peripheral surface of the first cylindrical connecting portion, so that the first cylindrical shape Sufficient liquid tightness can be maintained at the connecting portion between the connecting portion and the tubular discharging portion, and leakage of liquid can be prevented. In addition, also in the second tubular connecting portion, the outer peripheral surface of the tubular discharging portion and the inner peripheral surface of the second tubular connecting portion are in close contact with each other, so that liquid leakage can be prevented even more effectively.

Further, when the length of the second tubular discharge portion is made longer than the length of the first tubular discharge portion as described in claim 2, the outer side against the impact from the outside. Since the second tubular connecting portion provided on the can protect the connecting portion between the first tubular connecting portion and the tubular discharging portion, liquid leakage can be prevented more effectively.

Further, in the case where the third tubular connecting portion having the outer peripheral surface in close contact with the inner peripheral surface of the hollow tube is formed in the hollow tube connecting portion as in claim 3,
Even if a force is applied to the hollow tube in a direction away from the connector, the force acts so as to reduce the diameter of the hollow tube, and the hollow tube is unlikely to come off.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be clarified by describing embodiments with reference to the drawings.

FIG. 1 is a sectional view showing a liquid injection container having a connector for a liquid injection container according to an embodiment of the present invention. The liquid injection container system 11 has a container 12 that contains a liquid to be injected. In the container 12, for example, a drug solution such as an enema drug or a contrast agent is stored. Container 12
A cylindrical discharge portion 13 for injecting a liquid is provided on one end side of the. The container 12 is made of a flexible synthetic resin material such as polyethylene.

Connector 14 for liquid injection container of this embodiment
Is the cylindrical discharge portion 13 of the container 12 and the hollow tube 1.
It is used to connect 5 and. Hollow tube 15
Is made of an appropriate synthetic resin material such as soft vinyl chloride resin or polyethylene, and a cap 16 is attached to the distal end side of the hollow tube 15. The cap 16 has a tubular portion 16 a that surrounds the distal end side of the hollow tube 15.
In addition, a protrusion 16b extending toward the hollow tube 15 side is formed in the tubular shape 16a. The protrusion 16b is
It is configured so that the tip of the hollow tube 15 can be punctured.

Connector 14 for liquid injection container of this embodiment
Will be described in detail with reference to FIGS. 2 and 3. The liquid injection container connector 14 has a flange portion 17 in the center, and has first and second cylindrical connecting portions 18 and 19 on one side of the flange portion 17. Further, a flow path 20 through which the liquid passes is configured inside. The first tubular connecting portion 18 constitutes a part of the flow path 20 on the inner peripheral surface side thereof. In other words, the first tubular connection portion 18 is formed by extending the flow path 20.

The outer diameter B of the first tubular connecting portion 18 is made substantially equal to the inner diameter of the tubular discharging portion 13 of the container 12 shown in FIG. More specifically, when connecting, the tubular discharge portion 1
The outer diameter B of the first cylindrical connecting portion 18 is selected so that the inner peripheral surface of the first cylindrical connecting portion 18 can be in close contact with the outer peripheral surface of the first cylindrical connecting portion 18.

On the other hand, the second tubular connecting portion 19 is connected to the container 12
It is provided for inserting the cylindrical discharge portion 13 of the inside. Therefore, the inner diameter C of the second tubular connecting portion 19 is substantially equal to the outer diameter of the tubular discharging portion 13, so that the outer peripheral surface of the tubular discharging portion 13 has the second tubular connecting portion 19. It is configured to be in close contact with the inner peripheral surface of the.

Further, in this embodiment, the collar portion 17 is moved to the container 1
The length of the second tubular connecting portion 19 extending to the second side is longer than the length of the first tubular connecting portion 18. Therefore, even if an external force is applied to the connection portion, the second tubular connection portion 19 protects the connection structure between the first tubular connection portion 18 and the tubular discharge portion 13.

In FIG. 3, on the side opposite to the side where the first and second connecting portions 18 and 19 of the collar portion 17 are provided, the third portion is provided.
The tubular connection portion 21 is formed. The third tubular connecting portion 21 is provided to connect the hollow tube 15. The outer peripheral surface of the third tubular connecting portion 21 is configured to have a diameter substantially equal to the inner peripheral surface of the hollow tube 15, and therefore, the hollow tube is externally inserted into the third tubular connecting portion 21. By connecting the hollow tube 15 to the connector 14
It is possible to connect to. In addition, the collar portion 17
Are provided to regulate the extrapolation depth of the hollow tube 15.

Connector 14 for liquid injection container of this embodiment
The details of the state in which the container 12 and the hollow tube 15 are connected using the are shown in FIG. As is apparent from FIG. 4, in the connected state, the tubular discharge portion 13 of the container 12 has the first tubular connection portion 18 on the inner peripheral surface side.
And the inner peripheral surface of the second tubular connecting portion 19 on the outer peripheral surface side. Therefore, the liquid-tightness of the connecting portion between the connector 14 and the container 12 is effectively enhanced. Particularly, when the container 12 is formed by blow molding, burrs are apt to be generated on the outer side at the tip end side of the cylindrical discharge portion 13. Even if such burrs are generated, the first cylindrical connection Since the outer peripheral surface of the portion 18 and the inner peripheral surface of the tubular discharge portion 13 are surely brought into close contact with each other, liquid leakage can be reliably prevented.

Next, a concrete experimental example will be described. As the liquid injection container 12 shown in FIG. 1, polyethylene molded by blow molding (Shorex, trade name M
112) was prepared.

As the liquid injection container connector 14 shown in FIGS. 2 and 3, connectors made of four kinds of materials shown in Table 1 below were prepared as Examples 1 to 4.
Furthermore, as the hollow tube 15, a hollow tube made of a soft vinyl chloride resin formed by extrusion molding was prepared. A cap made of polyethylene is attached to the tip of the hollow tube 15 as the cap 16 shown in FIG.

Examples 1 to 3 prepared as described above
The container 12 filled with water and the hollow tube 15 are connected to each other using the connector 14 of, and the container 12 side is 5 kg / cm.
Liquid leakage was inspected at the connection between the container 12 and the connector 14 when a pressure of ² was applied.

For comparison, as the conventional connector shown in FIG. 6, connectors made of the materials shown in Table 1 below were prepared as Comparative Examples 1 to 4, and liquid leakage was inspected in the same manner as in Examples. did. The results are shown in Table 1 below.

The results of the liquid leakage inspection in Table 1 are as follows:
The result about 10 of each connector of Examples 1-4 and Comparative Examples 1-4 is shown.

[0032]

[Table 1]

As is clear from Table 1, in the connector of the present invention made of each material of Examples 1 to 4, no liquid leakage occurred, whereas in the conventional connector, any material was used. Even in the case, it can be seen that liquid leakage has occurred.

[0034]

In the connector for a liquid injection container according to the first aspect of the present invention, the portion connected to the liquid injection container has the first and second cylindrical connecting portions, and the first and second The liquid injection container is connected by both of the cylindrical connecting portions. Particularly, in the first tubular connecting portion, the inner peripheral surface of the tubular discharging portion of the liquid injection container is brought into close contact with the outer peripheral surface thereof. Therefore, even if the liquid injection container is obtained by blow molding and has a burr on the outer peripheral surface of the cylindrical discharge portion, it can be surely connected without causing liquid leakage.

Since the connector of the invention described in claim 1 has a relatively simple structure having the first and second cylindrical connecting portions, it has been conventionally used. The connector can be molded by injection molding similarly to the connector, and thus can be provided easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an entire liquid injection container system including a liquid injection container connector according to an embodiment of the present invention.

FIG. 2 is a front view showing the outer appearance of a connector for a liquid injection container according to an embodiment of the present invention.

3 is a cross-sectional view of the connector for liquid injection container shown in FIG.

4 is a partially cutaway enlarged cross-sectional view showing details of a connection portion using the connector for liquid injection container in FIG.

FIG. 5 is a cross-sectional view for explaining a conventional liquid injection container connector.

FIG. 6 is a cross-sectional view showing a conventional connector for liquid injection container.

[Explanation of symbols]

 11 ... Liquid injection container system 12 ... Container 13 ... Cylindrical discharge part 14 ... Liquid injection container connector 15 ... Hollow tube 18 ... First tubular connection part 19 ... Second tubular connection part 20 ... Flow path 21 ... Third tubular connection

Claims (3)

[Claims] 1. A connector for a liquid injection container for connecting a hollow tube to the cylindrical discharge part of a container containing a liquid to be injected and having a cylindrical discharge part for injecting the liquid. A first tubular connecting portion having a peripheral surface, wherein a portion of the container connected to the tubular discharging portion has an outer peripheral surface which is inserted into an inner peripheral surface of the tubular discharging portion and closely adheres to the inner peripheral surface; A second cylindrical connecting portion having an inner peripheral surface into which the cylindrical discharging portion is inserted and which is in close contact with the outer peripheral surface of the cylindrical discharging portion. 2. The connector for a liquid injection container according to claim 1, wherein the second tubular connection portion is longer than the first tubular connection portion. 3. A portion to which the hollow tube is connected,
The connector for a liquid injection container according to claim 1 or 2, which is a third tubular connection portion having an outer peripheral surface that is in close contact with the inner peripheral surface of the hollow tube.