JP2008174307A - Medical stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical cap which prevents infusion from leaking and prevents an injection needle from coming-off. <P>SOLUTION: A molding method of a stopper for the infusion is a method for compression-molding a single body stopper for the infusion which is joined to an outer frame body to be mounted on an infusion container and is composed only of an elastomer resin that the injection needle punctures to take out the infusion from the infusion container by filling the elastomer resin of a raw material into a die. The elastomer resin of the raw material with a shape which is formed by being extruded and cut out from an extruding machine is supplied to the surface of the lower die of the die, and the lower die and an upper die directly apply pressure to the raw material in the die by the approach of both the dies. The raw material is filled into the die while being crushed and the raw material filled into the die comprising the upper die and the lower die is compression-molded. Thereafter the die is separated and the stopper is cooled, and the stopper without irregularities due to the flow of the resin is obtained by molding the stopper which is a cooled molded article that is taken out from the stopper. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a medical stopper and a medical cap attached to a medical infusion container.

  2. Description of the Related Art Conventionally, a medical cap used for a medical infusion container has an elastomer resin plug body and an outer frame body, and the plug body is fitted into the outer frame body. The outer frame is attached to the infusion container by a method such as insert molding or welding. At the time of use, the injection needle is inserted into the stopper and the infusion solution in the container is taken out with the cap part facing down.

  However, such medical plugs are often formed by injection molding. In this case, the dissolved elastomer resin flows through the mold and is filled in the mold. Therefore, regularity occurs due to the flow of the dissolved elastomer resin, or distortion occurs due to internal stress. Moreover, deformation may be easy in one direction. As a result, there is a possibility that the infusion solution inside the container may leak from the gap between the stopper and the injection needle, or the injection needle may come off.

  In addition, even after the injection needle was removed, the penetration mark of the injection needle was not blocked, and infusion fluid could leak from the penetration mark. Furthermore, there is a possibility that a gap is generated between the plug body and the outer frame body due to distortion caused by internal stress of the plug body and / or the outer frame body, and the infusion solution may leak from the gap.

  The object of the present invention is to prevent the occurrence of regularity and internal stress by filling the mold without pouring the raw material into the plug body and / or outer frame body. The present invention provides a medical cap and a method for manufacturing the same.

  As a result of diligent studies to achieve the above object, the present invention employs a medical plug obtained by molding while compressing the raw material of the elastomer resin. In addition, a medical plug characterized in that the elastomer resin raw material was formed by compression molding was adopted.

  By molding while compressing the elastomer resin (compression molding), the elastomer resin is filled in the mold without being flowed and molded. As a result, there is no regularity due to the flow of the resin, and distortion due to internal stress can be suppressed. Therefore, no leakage of infusion occurs, and there is no possibility that the injection needle will come off.

  A medical plug according to the present invention is a method for forming a medical plug, in which an elastomer resin raw material is supplied to a lower mold, the lower mold and the upper mold are brought close to each other, and the elastomer resin is molded while being crushed. Can be manufactured.

  That is, the elastomer resin raw material is crushed by the lower mold and the upper mold, filled in the mold and molded (compression molding). As a result, the elastomer resin does not flow, regularity does not occur, internal stress does not occur, and the plug does not distort.

Furthermore, in a method for molding a medical cap having an elastomer resin plug and an outer frame,
The outer frame raw material is supplied to the first lower mold, the first lower mold and the first upper mold are brought close to each other, and the outer frame raw material is filled into the mold while being crushed. Molding the outer frame,
Taking out the outer frame body from the first lower mold and supplying it to the second lower mold;
Further, an elastomer resin is supplied to the second lower mold, the second lower mold and the second upper mold are brought close to each other, and the elastomer resin is filled in the mold while being crushed. A molding method of a medical cap for molding a resin plug body and attaching the elastomer resin plug body and the outer frame body,
The outer frame raw material is supplied to the first lower mold, the first lower mold and the first upper mold are brought close to each other, and the outer frame raw material is filled into the mold while being crushed. Molding the outer frame,
Further, an elastomer resin is supplied to the first lower mold, the first lower mold and the second upper mold are brought close to each other, and the elastomer resin is filled in the mold while being crushed. A molding method for a medical cap in which a plug body of a resin is molded and the plug body of the elastomer resin and the outer frame body are bonded together can also be employed.

  The outer frame of the medical cap according to the present invention can also be formed by compression molding. Similar to the plug body, regularity of the raw material due to the flow can be eliminated, generation of internal stress can be suppressed, and an outer frame body without distortion can be formed. Moreover, after the outer frame body is molded, an elastomer resin is supplied into the outer frame, and the plug body can be molded by the method described above. In this case, the outer frame body and the plug body can be satisfactorily bonded.

A molding method for a medical cap in which a plug body and an outer frame body of an elastomer resin are molded by the molding method according to claim 3 and the plug body of the elastomer resin is fitted into the outer frame body can be employed.
That is, irrespective of the above-described method, a medical cap can be formed by separately manufacturing an outer frame body and a plug body, and inserting the elastomer resin plug body into the outer frame body.

  In the present invention, synthetic resin is used as a raw material for the outer frame. That is, it is not particularly limited as long as it is a synthetic resin, and polyethylene, polystyrene, polypropylene and the like are suitable. The elastomer resin that is a raw material of the plug body is not particularly limited, but an elastomer resin such as olefin, styrene, polyurethane, polyester, polyvinyl chloride, or polybutadiene is preferably used.

  In the medical cap of the present invention, since the plug body and / or the outer frame body are formed by compression molding, there is no regularity due to the flow of raw materials and no distortion due to internal stress. As a result, the infusion solution inside the container does not leak from the gap between the stopper and the injection needle, or the injection needle does not come out, and the penetration mark of the injection needle is well blocked even after the injection needle is removed. The infusion solution does not leak from the penetrating marks. Since the fitting with the stopper and / or the outer frame is good, there is no gap between the stopper and the outer frame, and the infusion does not leak.

  FIG. 1 is a schematic cross-sectional view showing a process of forming a substantially cylindrical plug by the method according to the present invention. In FIG. 1, 1 is a plug raw material, 2 is a lower mold, and 3 is an upper mold. In FIG. 1A, the plug body raw material 1 is an elastomer resin and is supplied into the lower mold 2. As shown in FIG. 1B, the lower mold 2 and the upper mold 3 approach each other. Further, when the lower mold 2 and the upper mold 3 approach each other, as shown in FIG. 1 (c), the plug raw material 1 is sandwiched between the lower mold 2 and the upper mold 3 and crushed. Filled in mold. Then, as shown in FIG. 1 (d), the filling into the mold is completed and the plug body 4 is formed. Finally, as shown in FIG. 1 (e), the lower mold 2 and the upper mold are formed. The mold 3 is separated and the plug 4 is cooled. When the mold is separated, if the stopper 4 is sucked by the upper mold 3, the stopper 4 can be easily taken out.

  According to this molding method, the plug body raw material 1 does not flow in the mold, but is filled while being crushed. Therefore, regularity due to the flow of the elastomer resin does not occur. Therefore, since the plug body 4 does not have a directionality that easily deforms in one direction, the infusion solution inside the container does not leak from the gap between the plug body and the injection needle, and the injection needle does not come off. Moreover, even after the injection needle is pulled out, the penetration mark of the injection needle is well blocked, and the infusion does not leak from the penetration mark.

  Next, a method for forming a medical cap by forming an outer frame and forming a plug in the outer frame will be described. FIG. 2 is a schematic cross-sectional view showing a process of forming a substantially cylindrical plug by the method according to the present invention. In FIG. 2, 5 is an outer frame raw material, 12 is a lower mold, and 13 is an upper mold. In FIG. 2A, the outer frame raw material 5 is supplied into the lower mold 12. As shown in FIG. 2B, the lower mold 12 and the upper mold 13 approach each other. Further, when the lower mold 12 and the upper mold 13 approach each other, as shown in FIG. 2C, the outer frame raw material 5 is sandwiched between the lower mold 12 and the upper mold 13 and is crushed. Filled in the mold. Then, as shown in FIG. 2 (d), the filling into the mold is completed and the outer frame body 6 is formed. Finally, as shown in FIG. The mold 13 is separated and the outer frame 6 is cooled. When the mold is separated, the outer frame body 6 can be left in the lower mold 12 by air blowing with the upper mold 13.

  As described above, according to such a molding method (compression molding), the outer frame raw material 5 is filled and molded in the mold while being crushed, so that the raw material does not flow and regularity due to flow occurs. There is no. As a result, internal stress can be suppressed and the outer frame body 6 without distortion can be formed.

  Furthermore, a method for forming a plug in the outer frame will be described. FIG. 3 is a schematic cross-sectional view showing a process of forming a substantially circular plug in an outer frame already formed by the method according to the present invention. In FIG. 3, 6 is an outer frame, 22 is a lower mold, and 23 is an upper mold. In FIG. 3A, the outer frame body 6 is formed by the above-described method, is supplied into the lower mold 22, and the plug body raw material 1 is supplied inside the outer frame body 6. The lower mold 22 may be the same as or different from the lower mold 12 in FIG. That is, the outer frame body 6 may be left in the lower mold 12 after molding. Further, after molding, the outer frame body 6 may be taken out from the lower mold 12 and supplied to another lower mold 22.

  As shown in FIG. 3B, the lower mold 22 and the upper mold 23 approach each other. Furthermore, when the lower mold 22 and the upper mold 23 approach, the plug body raw material 1 is sandwiched between the lower mold 22 and the upper mold 23 as shown in FIG. The mold and the outer frame body 6 are filled. And as shown in FIG.3 (d), the filling in a metal mold | die is completed, and the plug body 14 is shape | molded. The mold 22 and the upper mold 23 are separated, and the plug 4 is cooled. When the mold is separated, the plug 14 can be left in the lower mold 22 by air blowing with the upper mold 23. Thus, finally, as shown in FIG.3 (e), the medical cap 30 is shape | molded.

  As described above, since the plug body 14 does not have regularity due to the flow during molding, leakage of the infusion solution can be suppressed and there is no distortion due to internal stress. Since the plug body 14 can be satisfactorily attached to the outer frame body 6, there is no fear of leakage of infusion from between the outer frame body 6 and the plug body 14.

  Of course, it is also possible to mold a medical cap by inserting the plug body molded by the method shown in FIG. 1 inside the outer frame body molded by the method shown in FIG.

  In addition, the shape of the raw material of the plug body and the outer frame body is not particularly limited, but is preferably a lump shape, an elongated linear shape extruded from the extruder, or a shape extruded from the extruder and cut into a substantially cylindrical shape. Moreover, in shaping | molding of an outer frame, as shown in FIG. 4, the shape of the outer frame raw material 5 can be made into a substantially ring shape. (Each step is the same as the step shown in FIG. 2) That is, as shown in FIG. 4A, the middle die 33 is arranged in the lower die 12, and the lower die 12 and the middle die are arranged. A substantially ring-shaped outer frame material 5 is supplied between Then, the outer frame body 6 is molded by filling the raw material 5 while crushing the gap between the lower mold 12 and the middle mold 33 with the upper mold 33 (FIGS. 4B to 4D). ). In this case, the burr | flash which can be made into the hollow part of the outer frame 6 at the time of shaping | molding can be eliminated, or a burr | flash can be made small. Of course, the shape of the raw material 5 can also be made ring-shaped by the lower mold 12 and the upper mold 13 shown in FIG.

  Further, according to the molding method of the present invention, a medical cap can be more efficiently molded by using a plurality of molds. FIG. 5 is a diagram schematically showing a method of continuously forming a medical cap. In this method, a plurality of molds are attached to the stage 40 and the stage 41, the stages 40 and 41 are rotated, and the steps are sequentially performed.

  That is, at 40a, the raw material is supplied to the first lower mold (corresponding to FIG. 2 (a)). In 40b, compression molding of the outer frame is performed (corresponding to FIGS. 2B to 2D). In 40c, the outer frame body is cooled by being attracted to the upper mold. At 40d, the mold is released (corresponding to FIG. 2 (e)). At 40e, the outer frame is taken out, and at 40f, it is supplied to the second lower mold.

  Next, at 41a, the plug body raw material is supplied (corresponding to FIG. 3 (a)). In 41b, compression molding of the plug is performed (corresponding to FIGS. 3B and 3C). In 41c, it is adsorbed by the upper mold and the plug is cooled. At 41d, the mold is released (corresponding to FIG. 3 (d)). At 41e, the outer frame body is taken out (corresponding to FIG. 3 (e)), and at 41f, it is taken over by a subsequent process such as an inspection process.

  Alternatively, the stages 40 and 41 can be separated, the outer frame body and the plug body can be individually molded, the plug body can be fitted into the outer frame body, and the medical cap can be molded.

  Continuous molding can also be performed in one stage. FIG. 6 is a diagram schematically showing a method for continuously forming a medical cap in one stage. 42a-42d is a process corresponding to 40a-40d, and an outer frame body is shape | molded. 42e to 42j are steps corresponding to 41a to 41f, and the plug body is formed inside the outer frame body.

It is a schematic sectional drawing which shows an example of the process of shape | molding a plug body with the shaping | molding method which concerns on this invention. 1A shows a state in which raw materials are supplied to the lower mold, FIGS. 1B to 1D show how the plug body is molded, and FIG. 1E shows that the plug body is adsorbed to the upper mold. Each of the cooling states is shown. It is a schematic sectional drawing which shows an example of the process of shape | molding an outer frame with the shaping | molding method which concerns on this invention. 2A shows a state in which raw materials are supplied to the lower mold, FIGS. 2B to 2D show how the outer frame is formed, and FIG. 2E shows how the mold is released. Each is shown. It is a schematic sectional drawing which shows an example of the process of shape | molding a plug body in an outer frame body by the shaping | molding method which concerns on this invention. 3 (a) shows a state in which raw materials are supplied to the lower mold, FIGS. 3 (b) and 3 (c) show how the outer frame is molded, and FIG. 3 (d) shows how the mold is released. FIG. 3 (e) shows a state where the medical cap is taken out, respectively. It is a schematic sectional drawing which shows the other example of the process of shape | molding an outer frame with the shaping | molding method which concerns on this invention. 4A shows a state where raw materials and a middle mold are supplied to the lower mold, FIGS. 4B to 4D show how the outer frame is molded, and FIG. 4E shows the upper mold. Each is shown separated. It is the figure which showed typically an example of the method of shape | molding a medical cap continuously by the shaping | molding method which concerns on this invention. It is the figure which showed typically an example of the method of shape | molding a medical cap continuously by the shaping | molding method which concerns on this invention.

Explanation of symbols

1 Plug material 2, 12, 22 Lower mold 3, 13, 23, 33 Upper mold 4, 14 Plug 5 Outer frame material 6 Outer frame 30 Medical cap 34 Medium mold 40, 41, 42 Stage

Claims (1)

A single infusion plug made of only an elastomer resin that is attached to an outer frame body to be attached to the infusion container and pierces an injection needle to take out the infusion liquid from the infusion container, and the elastomer resin as a raw material is placed in the mold. A method for forming a plug for infusion for filling and compression molding,
Supplying an elastomer resin, which is a raw material, in a shape cut out by extrusion from an extruder on the lower mold surface in the mold,
The lower mold and the upper mold apply pressure directly to the raw material in the mold by approaching both molds, and fill the mold while crushing the raw material. After compression molding the raw material filled in the mold composed of an upper mold, the mold is separated, the plug is cooled, and the plug, which is a cooled molded product, is molded Obtained by molding from
Compression molded infusion plug without regularity due to resin flow.

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