JPH0319877Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] This invention relates to an improvement in the sealing membrane portion of a synthetic resin infusion cap used for medical purposes. [Prior Art] Normally, a sealing membrane is disposed on the bottom surface of a rubber stopper or the like installed inside the cap body, and serves to seal the bottle, and when a syringe needle or the like is inserted from the outside. It is provided to allow needle insertion into the inside of the container. From the viewpoint of processability, conventional sealing membranes of this type were generally injection molded products that were uniformly molded together with the cap main body, so to speak, they were composed of a continuous molded product of the same quality as the cap main body. . [Problems to be solved by the invention] However, in conventional caps with this configuration, although it is preferable in terms of processability, the sealing membrane part itself is simultaneously molded integrally with the cap main body by injection molding, etc. Therefore, during molding, the resin crystals are oriented toward the periphery around the resin reservoir, which is located in the center of the sealing membrane and corresponds to the gate part. A drawback was discovered that unnecessarily reduced the physical strength of the material. In other words, when a conventional cap is punctured with a needle, a crack occurs in the orientation direction of the resin, and in some cases, this progresses to the point where it collapses, causing a situation where the rubber stopper located at the top falls out into the bottle. However, it was discovered that all of these results were caused by the orientation. In particular, this tendency was even more pronounced for pharmaceutical infusion caps, which are often sterilized. In terms of materials, for example, when polypropylene (PP) is used, homopolymers tend to be more prone to this than copolymers, and this can lead to restrictions on material selection in order to prevent cracks. I didn't like it. Furthermore, since it was a completely simultaneous and integral continuous molded product, the film thickness was naturally limited to about 0.3 m/m due to the molding conditions.
Although the thinner the sealing membrane is, the better it is in terms of needle stickability, it cannot necessarily be said that it is sufficient in terms of thinning. In addition, especially in the case of injection molded products, the resin pool corresponding to the gate part is located in the center of the sealing membrane part, so it is virtually difficult to puncture this part with a needle, so avoid this part when using it. must be used with
In particular, with so-called transfer needles used when co-injecting other medicinal solutions with the liquid content, troubles caused by needle sticks are even more noticeable, and this is by no means preferable in terms of workability. Therefore, the purpose of this invention is to reliably prevent the occurrence of cracks during needle pricking, maintain flexibility in material selection, and furthermore achieve as thin a sealing membrane as possible. The present invention aims to provide an infusion cap that can avoid coring troubles and further improve workability. [Means for Solving the Problems] In order to solve the above-mentioned problems, this invention provides a cap for infusions made of synthetic resin, which has a sealing membrane portion on the inside of the cap body into which a syringe needle or the like can be pierced. The membrane part is composed of a film or sheet made of an independent molded body in which resin crystals are non-oriented,
This film or sheet and the cap body are integrally molded to form a cap for infusion. [Function] Therefore, since the sealing membrane part is a film or sheet formed separately from the cap body, the resin crystals are not oriented around the resin pool that corresponds to the gate part of the molding machine, as in the conventional case. This is structurally impossible, and since the resin crystal itself is non-oriented, it is possible to reliably prevent cracks from occurring during needle insertion, and there is also freedom in material selection, and there are no restrictions on thinning. It can be achieved without any problem. Moreover, since there is no resin pool in the structure, there are no difficult parts to stick with a needle, which eliminates troubles and dramatically improves work efficiency. [Example] The drawings are cross-sectional views showing one embodiment of the cap for infusion according to the present invention, in which 1 is a cap main body, and 2 is a cap in which the resin itself disposed inside the cap main body is non-oriented. It is a film-like sealing membrane part with a thickness of 0.1m/m. Further, reference numeral 3 denotes a rubber plug installed inside the cap main body 1, and is provided on the surface of the sealing membrane 2. The sealing membrane part 2 is an independent molded body separate from the cap body part 1 molded by injection molding or the like, and is not molded at the same time, but is formed by insert molding or multicolor molding, etc. A structure is adopted in which the part 2 is bonded to the cap main body part 1. Therefore, even if a syringe needle is inserted through a rubber stopper, the sealing membrane part 2 has no unfavorably oriented tissue and there is no resin pool, so the needle can be inserted arbitrarily and quickly over the entire surface of the sealing membrane part. This can prevent cracks from occurring. Incidentally, in this embodiment, the sealing membrane part 2 is bonded to the cap main body part 1 by insert molding and is integrally molded, but it may be integrally molded using multicolor molding or the like, but there are limitations. It's not a thing.
The film thickness is also not limited, and it is possible to make sheets or films with a thickness of 0.3 m/m or less, or at least 30 μm, but the most preferable range is 0.1 to 0.2 m/m in terms of processability. It is. The material used is polypropylene copolymer, just like the cap itself, but homocopolymers can also be used, and other suitable materials can be freely selected. Further, although this embodiment has a structure in which a rubber stopper 3 is provided, the present invention is not limited to this, and for example, a structure having only a sealing membrane portion without a rubber stopper may also be adopted. Next, a coring generation test by needle pricking was conducted on the cap of the above example. For comparison, a film formed by conventional injection molding was also tested. The samples were steam sterilized at 115°C for 30 minutes, and the number of specimens was 20. The needle insertion angle was 90° vertically and 60° diagonally. The test needles were 18GRB needles from different manufacturers (needle A,
B, C), 200 type plastic needle (used needle D), 200
A type metal needle (used needle E) and a type 500 plastic needle (used needle F) were used. Table 1 shows the number of occurrences of coring.

【table】

[Effect of idea]

As described above, unlike conventional caps, which are usually completely molded at the same time, this design consists of a sealing membrane part that is an independent molded body separate from the cap body, and the resin is not oriented. Therefore, if the sealing membrane part is bonded to the cap body and integrally molded, the occurrence of cracks in the sealing membrane part will be reliably prevented, and the material selection will be free.
In addition, it has been possible to achieve as thin a wall as possible, and in addition, it has been possible to prevent coring troubles and further improve workability.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the cap according to the invention. 1... Cap, 2... Sealing membrane part.

Claims (1)

[Scope of utility model registration request] In a synthetic resin infusion cap that has a sealing membrane part into which a syringe needle or the like is pierced inside the cap body, the sealing membrane part is a film or sheet made of an independent molded body in which the orientation of the resin is non-oriented. An infusion cap characterized by being integrally molded with the cap body.