JPS5841161Y2 - Liquid inlet tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid outlet tube, and more particularly to a tube constituting a liquid outlet of an infusion bag or the like.

As shown in the first and second figures, a liquid inlet tube 3 of a conventional infusion bag or the like includes a hard tube 1 with one end closed, and a soft tube 2 having a thickness that can be tightly fitted into the hard tube 1.
Therefore, the two tubes are joined together, and the end on the soft tube 2 side is inserted into a liquid storage bag 4 such as an infusion bag.
It is attached to the liquid storage bag by welding the film that makes up the liquid storage bag and the soft tube, but the difficulty in manufacturing is that two types of tubes must be joined while maintaining a hollow state. Yes, also
When inserting a syringe needle or the like and taking out the liquid inside the bag through the liquid inlet tube, or when injecting other medicinal liquid into the bag and mixing it with the liquid inside the bag, put an elastic rubber at the tip of the tube to prevent liquid leakage. There was the hassle of having to attach a stopper.

This invention was completed as a result of research in order to eliminate the above-mentioned drawbacks, and its gist is that a rubber stopper is inserted into a tube made of thermoplastic resin, and that the outer surface of the rubber stopper is attached to the inner wall surface of the tube. A thermoadhesive resin film that surrounds at least part of the entire circumference of the opposing regions is interposed between the tube and the rubber plug, and the thermoadhesive resin film and the inner wall surface of the tube are thermally bonded. This is a liquid inlet tube.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3 shows a first embodiment 8 of the liquid inlet tube according to the present invention.

A cylindrical rubber stopper 6 with a diameter wider than the inner diameter of the tube is inserted into the thermoplastic resin tube 5, and the lower side of the rubber stopper 6 as shown in FIG. A heat-adhesive resin film 7 shaped like a saucer is fitted onto the tube 5, and the heat-adhesive resin film 7 and the inner wall surface of the tube 5 are thermally bonded over the entire circumference.

FIG. 5 shows a second embodiment 18 of the liquid spout tube according to the present invention, which differs from the first embodiment only in that the thermoadhesive resin film 7 is a coating film that covers the entire rubber 6. The other configurations are the same as in the case of the first embodiment 8.

In the liquid inlet tube according to the present invention, the thermoplastic resin tube is made of polyethylene or polypropylene crosslinked by a chemical method using some organic compound called peroxide as a crosslinking agent or by irradiation with ionizing radiation. , tubes made of olefin resins such as ethylene-vinyl acetate copolymers and ethylene-ethyl acrylate copolymers, crosslinked polymers such as polyamides and polyvinyl chloride, or tubes made of olefin resins such as polyethylene and polypropylene, polyamides, etc. , a shrinkable tube obtained by stretching by extrusion molding can be applied.

Next, as the rubber plug, a molded article of synthetic rubber such as natural rubber, nitrile rubber, butadiene rubber, isoprene rubber, butyl rubber, or urethane rubber can be used.

Next, as a heat-adhesive resin film, use a film made of polyethylene, ionomer, polyamide, ethylene-vinyl acetate copolymer, etc., molded into the shape shown in Figure 4, or a coating film of polyethylene that covers the entire rubber stopper. It can be applied.

In order to seal the entire circumference between the rubber stopper and the inner wall of the tube, it is sufficient that the thermoadhesive resin film surrounds at least part of the entire circumference of the outer surface of the rubber stopper facing the inner wall of the tube. Therefore, shapes other than those described above may be used as long as such conditions are met.

The liquid inlet tube 8 or 18 according to the present invention has one end inserted into the liquid storage bag 4 such as an infusion bag as shown in FIG. It is attached to the liquid storage bag by welding the resin bag tubes together.

As described above, the liquid inlet tube according to the present invention has a rubber built-in tube, so it is possible to insert a syringe needle or the like into the rubber stopper and take out the liquid in a bag such as an infusion bag through the liquid outlet tube, or Other medicinal solutions can be mixed with the solution in the bag, and there is no need to attach an elastic rubber stopper to the end of the tube as in conventional products.

In addition, the tip of the tube can be sealed as shown in Figure 7 to keep the inside of the tube in a completely sterile state, and the tube tip can be cut off before use. There is no need to attach a film to prevent contamination of the stopper.

The liquid inlet tube according to the present invention described above can be manufactured by the following two methods.

The first method utilizes the memory effect of crosslinked polymer tubes, and uses crosslinked olefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer as shown in Figure 8. A part of the tube 15 made of a crosslinked polymer such as polyamide or polyvinyl chloride is formed into a tube with a wide inner diameter into which a rubber plug can be inserted as shown in FIG. is inserted together with the thermoadhesive resin film 7, and then the portion formed to have a wide diameter is heated to restore the tube to its original thickness, thereby obtaining a liquid pouring inlet tube 8 as shown in the third figure. It's a method.

Next, the second method utilizes the shrinkability, and the 12 As shown in the figure, a rubber stopper 6 is inserted together with a heat-adhesive resin film 7, and then heated and shrunk to form a liquid pouring inlet tube 8 as shown in the third figure.
This is the way to obtain.

In this second method, it is desirable that the shrinkage rate of the shrinkable tube be 40 to 50% less than that of conventional products so that the portion of the tube without the rubber stopper remains hollow after shrinkage.

FIG. 13 shows a third embodiment of the liquid pouring inlet tube according to the present invention, which differs from the first embodiment only in that the portion of the tube below the insertion position of the rubber stopper is formed double. The other configurations are the same as the first embodiment.

The feature of this embodiment is that the part of the tube below the rubber stopper insertion position is double-layered, which improves the hollow retention of the tube below the rubber stopper insertion position. It is.

Further, according to this embodiment, the tube wall is thickened in the portion of the tube below the rubber plug insertion position to improve hollow retention, and the tube wall is thinned in the tube portion above the rubber plug insertion position. This makes it possible to improve the workability of welding and sealing.

Furthermore, this embodiment has the advantage that the rubber stopper can be easily fixed in position within the tube due to the presence of a step on the inner wall surface.

In the third embodiment described above, the constituent material of the inner tube 35b is polyethylene, ethylene-vinyl acetate copolymer, etc., which deforms as the outer tube 35a shrinks and deforms, and is heat-sealable to the outer tube 35a. A resin with a low softening point can be applied.

Further, as the outer tube 35a, either the above-mentioned crosslinked polymer tube or shrinkable tube can be used.

As described above, the liquid pouring inlet tube according to the present invention is made of one tube, and unlike conventional products, two tubes are used.
Since the tubes are not joined together while maintaining their hollow state, they are much easier to manufacture than conventional products.

As described in detail above, the liquid inlet tube according to the present invention includes a rubber stopper inserted into a thermoplastic resin tube, and a region of the outer surface of the rubber stopper facing the inner wall surface of the tube. A thermoadhesive resin film surrounding at least a portion of the entire circumference is interposed between the tube and the rubber stopper, and the thermoadhesive resin film and the inner wall surface of the tube are thermally bonded. Therefore, when pouring out or injecting liquid from inside the bag, there is no need to attach an elastic rubber stopper to the tip of the tube, so that liquid can be quickly poured out or injected.

Furthermore, by sealing the tip of the tube, the inside of the tube can be kept completely sterile until use.

Furthermore, since it is made from a single tube, it is extremely easy to manufacture compared to conventional products.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional infusion bag, FIG. 2 is a cross-sectional view taken along line A-A shown in FIG. 1, and FIG. 3 is a cross-sectional view showing a first embodiment of the liquid inlet tube according to the present invention , FIG. 4 is a perspective view of a molded body of a thermoadhesive resin film, FIG. 5 is a cross-sectional view showing a second embodiment of the liquid inlet tube according to the present invention, and FIG. A cross-sectional view of the spouting inlet tube attached to the liquid storage bag, FIG. 7 is a cross-sectional view of the liquid spouting inlet tube according to the present invention with the end of the tube sealed, and FIGS. 11 and 12 are cross-sectional views showing the manufacturing process of the liquid spout tube according to the second manufacturing method of the present invention; FIG. 13 is a cross-sectional view showing the manufacturing process of the liquid spout tube according to the first manufacturing method; FIG. 3 is a cross-sectional view of a third embodiment of the liquid inlet tube of the present invention; 5.15.25...Tube, 6...
Rubber stopper, 7...Thermoadhesive resin film.

Claims (7)

[Scope of utility model registration request] (1) A rubber stopper is inserted into a thermoplastic resin tube, and a thermoadhesive resin film surrounds at least a portion of the outer surface of the rubber stopper facing the inner wall surface of the tube. is interposed between the tube and the rubber stopper, and the thermoadhesive resin film and the inner wall surface of the tube are thermally bonded. (2) The thermoadhesive resin film is formed into a saucer shape so that it can fit under the rubber plug, and the molded thermoadhesive resin film fits under the rubber plug. A liquid spouting inlet tube according to claim 1, characterized in that the tube is provided with a tube. (3) Utility model registration claim 1, characterized in that the heat-adhesive resin film covers the entire outer surface of the rubber.
Liquid inlet tube as described in section. (4) The liquid inlet tube according to claim 1, wherein the tube is a shrinkable plastic tube. (5) The liquid inlet tube according to claim 1, wherein the tube is a crosslinked plastic tube. (6) The liquid according to claim 4, wherein the tube is a shrinkable plastic tube in which a portion of the tube below the insertion position of the rubber stopper is formed double. Outlet tube. (7) The liquid injector according to claim 5, wherein the tube is a cross-linked plastic tube in which a portion of the tube below the insertion position of the rubber stopper is formed double. Entrance/exit tube.