JP4416155B2 - Manufacturing method of medical cap - Google Patents

Description

  The present invention relates to a method for producing a medical cap used for an infusion bottle or the like.

  2. Description of the Related Art Conventionally, a cap provided with a needle puncture rubber or elastomer resin plug inside an outer frame made of synthetic resin is used so that the drug solution can be taken out from an infusion bottle or the like with a needle. A medical cap composed of the plug body and the outer frame body is used by incorporating the plug body into a substantially cylindrical outer frame body. In particular, when the plug body is made of an elastomer resin, it has been studied to simply weld the surface of the elastomer resin plug body to the inside of the outer frame body so as to be integrated with the outer frame body. A medical cap having a structure in which a stopper is sandwiched between an outer frame body and an inner frame body of a synthetic resin is also used.

Therefore, in such a conventional medical cap, the close contact between the plug body and the outer frame body may not be sufficient. In such a cap, the plug body may be detached from the outer frame body by inserting and removing the needle, which may affect the sealing performance of the chemical solution, and the plug body may come off together when the needle is removed. . In order to improve these problems, a medical cap has been proposed in which ridges or projections protruding from the side wall of the plug body are provided on the inner wall surface of the outer frame body (for example, Patent Document 1).
JP 2003-169840 A

  In such a conventional medical cap, even if the stopper can be prevented from being peeled off by the ridges or the protrusions, it is possible to effectively prevent leakage of liquid medicine or the like from the needle puncture marks that can be formed on the stopper after the needle is pulled out. could not. Therefore, there has been a demand for a medical cap formed by providing a flexible collar on the inner wall of the outer frame and bending the collar. With a medical cap having such a structure, not only can the adhesion between the plug body and the outer frame body be secured by the buttocks, but also the needle puncture mark is blocked by the restoring force of the buttocks after molding, thus preventing liquid leakage. Can do.

  However, in the conventional injection molding, since the thermoplastic elastomer raw material is filled into the outer frame body and the mold at a relatively high pressure, the plug body is molded in a state where the collar portion is pressed against the inner wall of the outer frame body. Probability increases. As a result, the effect of preventing the plug from peeling off cannot be obtained.

  An object of the present invention is to provide a method of manufacturing a medical cap that can effectively prevent the plug body and the outer frame body from being separated by the insertion and removal of the needle and the leakage of the chemical liquid from the needle stick mark.

As a result of intensive studies to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the inner wall is provided with a flange extending in the center direction and the opening direction, and the inside of the outer frame body made of synthetic resin is molded in advance A method for producing a medical cap for molding a plastic elastomer plug,
The outer frame is loaded into the lower mold so that the flange extends toward the upper mold, the thermoplastic elastomer material is loaded into the outer frame, and the thermoplastic elastomer material is pressed with the upper mold. The thermoplastic elastomer plug is filled with the raw material in the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is bent toward the lower mold. The manufacturing method of the medical cap that molds the body was adopted.

  The present invention is a method for molding a plug body by pressing an elastomer material into an outer frame body by compression molding. That is, the flange extending in the center direction and the opening direction (obliquely upward toward the upper mold) from the inner wall of the outer frame is bent downward (lower mold side) by the elastomer raw material pressed against the upper mold. At the same time, since the elastomer raw material is filled so as to cover the periphery of the collar part, the thermoplastic elastomer plug is molded with the collar part bent to the lower mold side.

  Therefore, since the collar portion and the plug body are fitted to each other, the plug body can be prevented from being peeled even if the needle is inserted into and removed from the plug body. As a result, the adhesion between the outer frame body wall and the plug can be secured, and leakage of a chemical solution or the like can be prevented. Moreover, since the collar part is in the bent state, the restoring force by the collar part acts on the plug. The restoring force works so as to close the needle puncture mark formed on the stopper, so that the resealability of the needle puncture mark is improved, and leakage of the chemical liquid or the like from the needle puncture mark can be prevented.

According to a second aspect of the present invention, there is provided a medical cap for molding a plug made of a thermoplastic elastomer inside an outer frame body made of a synthetic resin and having a flange portion extending in a center direction and an opening direction on an inner wall. A manufacturing method comprising:
The outer frame body is molded by a first upper mold and a lower mold, the outer frame body is left in the lower mold, a thermoplastic elastomer material is loaded into the outer frame body, and the thermoplastic elastomer material Is pressed with a second upper mold, the raw material is filled into the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is inserted into the lower mold. A method for producing a medical cap in which a plug made of a thermoplastic elastomer is molded in a bent state.

  By molding the outer frame body with the first upper mold and the lower mold and leaving the outer frame body in the lower mold, the step of loading the outer frame body into the lower mold can be omitted, An efficient medical cap can be manufactured.

According to a third aspect of the present invention, there is provided a medical cap in which a thermoplastic elastomer plug body is molded inside an outer frame body made of a synthetic resin and having a flange portion extending in the center direction and the opening direction on the inner wall. Because
The outer frame is loaded into the lower mold so that the flange extends toward the upper mold, the thermoplastic elastomer material is loaded into the outer frame, and the thermoplastic elastomer material is pressed with the upper mold. The thermoplastic elastomer plug is filled with the raw material in the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is bent toward the lower mold. A medical cap with a molded body.

According to a fourth aspect of the present invention, there is provided a medical cap in which a thermoplastic elastomer plug body is molded inside an outer frame body made of a synthetic resin and having a flange portion extending in a center direction and an opening direction on an inner wall. Because
The outer frame body is molded by a first upper mold and a lower mold, the outer frame body is left in the lower mold, a thermoplastic elastomer material is loaded into the outer frame body, and the thermoplastic elastomer material Is pressed with a second upper mold, the raw material is filled into the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is inserted into the lower mold. A medical cap in which a plug made of a thermoplastic elastomer was molded in a bent state.

  In the invention which concerns on Claim 3, 4, since the collar part is bent and it shape | molds in the state which had the restoring force, peeling of a plug and chemical | medical solution leakage can be prevented.

  According to the present invention, since the thermoplastic elastomer raw material is pressed into the outer frame body having the flange on the inner wall by compression molding, the stopper is molded in a state where the flange is bent inside the stopper. As a result, the collar can prevent the plug from peeling off when the needle is inserted and removed, and the needle puncture mark formed after the needle is pulled out by the restoring force of the collar can be blocked, so that leakage of the chemical solution can be prevented. In addition, as long as the stopper is not molded in a state where the collar portion is pressed against the inner wall of the outer frame body, pressing of the elastomer material is not limited to pressing by compression molding.

  Hereinafter, the invention will be described in more detail with reference to the drawings. FIG. 1 is a view showing a method for manufacturing a medical cap according to the present invention, and is a cross-sectional view showing a state in which a thermoplastic elastomer raw material is loaded. The outer frame body 1 is substantially cylindrical and has a substantially L-shaped cross section. The inner wall 3 includes a large diameter part 3a and a small diameter part 3b. The flange portion 2 extends from the inner wall 3b in the center direction and the opening direction (in the drawing, obliquely upward), and forms an angle θ1 with respect to the center axis direction CL of the outer frame body 1. The flange 2 may be provided on the entire circumference of the inner wall 3b or may be provided in a plurality of arcs at substantially equal angles in the circumferential direction.

  The outer frame body 1 is molded in advance by compression molding or injection molding, and the molding method is not particularly limited. The synthetic resin for the outer frame 1 is preferably a thermoplastic resin. Specifically, resins conventionally used for medical use such as polyethylene, polypropylene, and PET resins are preferable, but are not limited thereto.

  The outer frame body 1 is loaded in the lower mold 4 so that the flange portion 2 extends to the upper mold 5 side. In this state, the elastomer raw material 6 is loaded inside the outer frame body 1, pressed by the upper mold 5 by compression molding, filled into the outer frame body 1 and lower mold 4, and the plug body is molded. . Examples of the thermoplastic elastomer resin that is a raw material of the plug body include olefin-based, styrene-based, polyurethane-based, polyester-based, polyvinyl chloride-based, and polybutadiene-based thermoplastic elastomer resins. It is not limited to.

  FIG. 2 is a diagram illustrating a state in which pressing is started by the upper mold 5. The elastomer raw material 6 is deformed by pressing and is pushed into the inside of the outer frame 1. Further, the elastomer raw material 6 bends the flexible collar 2 downward (lower mold 4 side) and deforms so as to cover the collar 2, and the angle θ between the collar 2 and the central axis direction CL is θ1. It is getting bigger.

  When the pressing further proceeds, as shown in FIGS. 3 and 4, the angle θ formed by the flange portion 2 with the central axis direction CL becomes larger than 90 degrees, and the elastomer raw material 6 is deformed so as to cover most of the flange portion 2. . When the pressing is finally completed, as shown in FIG. 5, the plug body 10 is molded inside the outer frame body 1, and the flange portion 2 is bent in the state where the flange portion 2 is bent toward the lower mold 4 (at an angle θ <b> 2). And the plug 10 are fitted to each other. Therefore, due to the fitting, even when the needle is inserted into or removed from the plug body 10, the plug body 10 is not peeled off, and the adhesion between the plug body 10 and the inner wall 3 is ensured, and leakage of a chemical solution or the like is ensured. Can be prevented.

  FIG. 6 is a diagram illustrating a state where the needle stick mark is closed (resealed). The figure shows a cross-sectional view of the medical cap 20 and shows a state in which the needle stick mark 12 remains on the stopper 10. For the sake of explanation, the needle puncture mark 12 is exaggerated and the infusion bag or the like to which the medical cap 20 is attached is not shown.

  As described above, the angle θ1 is formed with the central axis direction CL of the flange 2 before the plug body 10 is molded. After the plug body 10 is molded, the angle formed is θ2 (> θ1). Therefore, the restoring force by the collar part 2 shown by the arrow A acts on the plug body 10. On the infusion side of the needle stick mark 12, the restoring force is a force indicated by an arrow B, and acts to close the needle stick mark 12, so that the resealability of the cap 20 is improved. As a result, it is possible to prevent leakage of the chemical liquid from the needle stick mark 12. In addition, in order for the restoring force of the collar part 2 to generate | occur | produce effectively, (theta) 2 has preferable 100 to 170 degree | times.

  The outer frame body 1 may have an L-shaped cross section as described above, or may have a cylindrical shape without a stepped portion as shown in FIG. 7, and as shown in FIGS. The plug body 10 can be molded while being bent toward the mold 4 side. Therefore, the completed medical cap can effectively prevent the plug body and the outer frame body from being separated by the insertion and removal of the needle and the leakage of the drug solution from the needle stick mark.

  A medical cap can also be manufactured by so-called two-color molding. As shown in FIG. 8A, first, a cavity 8 is formed in the mold by the lower mold 4 and the first upper mold 7, and a synthetic resin material is filled into the cavity 8 by injection molding. Then, as shown in FIG. 8B, the outer frame body 1 is left in the lower mold 4, and thereafter, the elastomer raw material 6 is loaded into the outer frame body 1 as described with reference to FIGS. Then, the raw material 6 is pressed by the mold 5 (second upper mold), and the plug body 10 can be molded while the flange portion 2 is bent toward the lower mold 4 side. According to this method, the step of loading the outer frame body into the lower mold can be omitted, and the medical cap can be manufactured more efficiently. The outer frame body 1 can also be formed by compression molding.

It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state loaded with the thermoplastic elastomer raw material. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state which pressing started. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state which the press progressed. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state which the press progressed. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state which pressing completed. It is sectional drawing which shows the medical cap manufactured by the manufacturing method which concerns on this invention. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the state with which the thermoplastic elastomer raw material was loaded. It is a figure which shows the manufacturing method of the medical cap which concerns on this invention, and is sectional drawing which shows the first shaping | molding in two-color shaping | molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer frame 2 Eaves part 3 Inner wall of outer frame 4 Lower mold 5 Upper mold (2nd mold)
6 Thermoplastic Elastomer Raw Material 7 First Mold 10 Plug 20 Medical Cap

Claims (4)

A method for producing a medical cap, in which a thermoplastic elastomer plug is molded inside an outer frame body made of a synthetic resin and having a flange extending in the center direction and the opening direction on the inner wall,
The outer frame is loaded into the lower mold so that the flange extends toward the upper mold, the thermoplastic elastomer material is loaded into the outer frame, and the thermoplastic elastomer material is pressed with the upper mold. The thermoplastic elastomer plug is filled with the raw material in the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is bent toward the lower mold. A method for producing a medical cap for molding a body. A method for producing a medical cap, in which a thermoplastic elastomer plug is molded inside an outer frame body made of a synthetic resin and having a flange extending in the center direction and the opening direction on the inner wall,
The outer frame body is molded by a first upper mold and a lower mold so that the flange extends to the first upper mold side ,
The outer frame body is left in the lower mold, a thermoplastic elastomer raw material is loaded into the outer frame body, the thermoplastic elastomer raw material is pressed with a second upper mold, and the flange portion is placed on the lower mold side. A method for producing a medical cap, in which the raw material is filled into the outer frame and the lower mold while bending, and a thermoplastic elastomer plug is molded in a state where the flange is bent toward the lower mold. . A medical cap in which a thermoplastic elastomer plug is molded inside an outer frame body made of a synthetic resin, which has a flange extending in the center direction and the opening direction on the inner wall,
The outer frame is loaded into the lower mold so that the flange extends toward the upper mold, the thermoplastic elastomer material is loaded into the outer frame, and the thermoplastic elastomer material is pressed with the upper mold. The thermoplastic elastomer plug is filled with the raw material in the outer frame and the lower mold while the flange is bent toward the lower mold, and the flange is bent toward the lower mold. A medical cap with a molded body. A medical cap in which a thermoplastic elastomer plug is molded inside an outer frame body made of a synthetic resin, which has a flange extending in the center direction and the opening direction on the inner wall,
The outer frame body is molded by a first upper mold and a lower mold so that the flange extends to the first upper mold side, and the outer frame body is left in the lower mold, and a thermoplastic elastomer The raw material is loaded into the outer frame body, the thermoplastic elastomer raw material is pressed with a second upper mold, and the raw material is bent into the lower mold side while the raw material is bent into the outer frame body and the lower mold. A medical cap in which a plug made of a thermoplastic elastomer is molded in a state where the inside is filled and the heel portion is bent toward the lower mold side.

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