JP2013013585A - Medical cap and method for manufacturing the same - Google Patents

Abstract

The present invention provides a cap in which an elastomer plug is sealed without causing problems such as cracks on the surface of the elastomer plug and causing no trouble in manufacturing, and a method for manufacturing the same.
SOLUTION: An outer plug 1, an inner plug 2 having a cylindrical wall 21 and fitted into the outer plug 1, and an elastomer having a side surface 30a fused to the inner peripheral surface 21d of the cylindrical wall 21 over the entire surface. It is a cap C having a stopper 3, and the cylindrical wall 21 has flexibility, and an easily flexible portion is formed on the upper end 21 a side.
[Selection] Figure 2

Description

  The present invention relates to a cap and a manufacturing method thereof, and more particularly to a medical cap used for a mouth portion of an infusion container, a chemical solution container, and the like and a manufacturing method thereof.

  Conventionally, a cap in which a substantially cylindrical thermoplastic elastomer plug is enclosed has been used in the mouth portion of a drug solution container or an infusion container used in the medical field. The solution inside can be taken out (see Patent Document 1).

JP 2004-65459 A

  Conventionally, such a cap is manufactured by fusing the elastomer plug to the upper surface of the inner frame body and fitting the elastomer plug together with the inner frame body into an outer plug molded separately from the elastomer plug. However, since the thermoplastic elastomer used for the elastomer plug is strong, there is a problem that when the elastomer plug is aligned and transported so as to be fitted into the outer plug, the elastomer plugs stick to each other or adhere to each other. Arise. Further, when the elastomeric plug is fitted into the outer plug, the slipperiness of the elastomeric plug is poor, so that it does not fit smoothly into the outer plug, resulting in problems such as poor fitting.

  In order to solve such a problem, if the outer plug and the elastomer plug are formed integrally, as described in Patent Document 1, the shrinkage ratio between the resin used for the outer plug and the thermoplastic elastomer is as follows. Therefore, cracks or the like are generated on the surface of the elastomer plug, and when the injection needle or the like is pierced, the cracks may expand and liquid leakage may occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cap in which an elastomer plug is sealed without causing problems such as cracks on the surface of the elastomer plug and causing no trouble in manufacturing, and a method for manufacturing the same.

  The present invention is a cap having an outer plug, an inner plug that has a cylindrical wall and is fitted into the outer plug, and an elastomeric plug whose side surface is entirely fused to the inner peripheral surface of the cylindrical wall. The cylindrical wall is a cap that is flexible and has a flexible portion formed on the upper end side thereof.

  In the present invention, the cylindrical wall is formed so that the upper end side is thinner than the lower end side, and the upper end side of the cylindrical wall is the flexible portion.

  The present invention is the cap characterized in that at least one of the outer peripheral surface and the inner peripheral surface of the cylindrical wall is inclined.

  The present invention is also the cap characterized in that both the outer peripheral surface and the inner peripheral surface of the cylindrical wall are inclined.

  Moreover, this invention is a cap characterized by the inner peripheral surface of the said cylinder wall being stepped.

  Further, the present invention is a cap characterized in that a plurality of concave portions are intermittently formed in the circumferential direction at least on the upper end side of the cylindrical wall, and the concave portions serve as the flexible portions. .

  The present invention is the cap characterized in that the elastomer plug has an inclined step portion at the center of the upper surface thereof, and a needle piercing surface is formed on the inclined step portion.

  Further, the present invention is the cap characterized in that the outer plug has a side wall formed thicker than the lower end of the cylindrical wall.

  The present invention also relates to a method of manufacturing a cap composed of an outer plug, an inner plug, and an elastomer plug, wherein the inner plug is molded to a thickness that is flexible and the upper end side is the lower end side. A step of molding so as to be more flexible, a step of insert-molding an elastomer plug into the inner plug, the inner plug and the elastomer plug, and the outer peripheral surface of the inner cylinder being the inner peripheral surface of the outer plug. And a step of fitting into the outer plug while sliding on the cap.

  In the present invention, since the side surface of the elastomer plug is covered with the cylindrical wall of the inner plug, when the elastomer plug and the inner plug are fitted into the outer plug, the slipperiness is good and the fitting is not poor. There is no problem that the elastomer plugs stick to each other or stick when they are aligned and conveyed on the line. Further, the cylinder wall can be deformed in accordance with the shrinkage of the elastomer plug, and the cylinder wall on the surface side of the elastomer plug, which is particularly susceptible to cracking, is more easily deformed, so that the elastomer plug does not crack.

It is a top view which shows 1st Embodiment of this invention. It is a figure which shows 1st Embodiment of this invention, (a) side is a front view, (b) side is a figure corresponded in sectional drawing in the II-II line of FIG. It is a figure which shows the outer stopper in 1st Embodiment of this invention, and is sectional drawing in the II-II line of FIG. It is a front view which shows the inner plug in 1st Embodiment of this invention, (a) side is a front view, (b) side is a figure corresponded in sectional drawing in the II-II line of FIG. It is a top view which shows the elastomer stopper in 1st Embodiment of this invention. It is a figure which shows the elastomer stopper in 1st Embodiment of this invention, (a) side is a front view, (b) side is a figure corresponded in sectional drawing in the II-II line of FIG. It is a figure which shows 2nd Embodiment of this invention, and is a figure equivalent to FIG. It is a top view of an inner stopper and an elastomer stopper showing a third embodiment of the present invention. It is a figure which shows the modification of 1st Embodiment of this invention, and is a figure corresponding to FIG.

  A first embodiment of the present invention will be described with reference to FIGS. The cap C includes an outer plug 1, an inner plug 2 and an elastomer plug 3.

  The outer plug 1 includes a pull-top type sealing film portion 10 made of a pull-top 10a and a sealing film portion 10b, a top wall 12 that is continuous with a thin-walled portion 11 on a lower surface peripheral edge portion 10c of the sealing film portion 10, and It is comprised from the flange part 14 which follows the substantially cylindrical side wall 13 extended below the part 12a, and the lower end 13a of the side wall 13. As shown in FIG.

  The top wall 12 is formed with a planned opening portion 12b that is normally closed by the sealing film portion 10b and is opened by pulling the pull top 10a when used, and the side wall 13 is thicker than the cylindrical wall 21 of the inner plug 2. Formed. Further, the flange portion 14 is provided to be fused with a flange provided in a container (not shown) and to fix the cap C to the container, and the inner peripheral surface thereof has a fitting recess 14a. Is formed. In the present embodiment, the inner peripheral surface 13 b of the side wall 13 is inclined in accordance with the inclination of the outer peripheral surface 21 c of the cylindrical portion 21 of the inner plug 2. Further, the planned opening portion 12 b is formed in the same shape as the inclined step portion 32 of the elastomer plug 3.

  The inner plug 2 is made of a synthetic resin that is more slidable than a thermoplastic elastomer, and includes a substantially annular base 20 and a cylindrical wall 21 that stands on the base 20. The base 20 has a fitting convex portion 20a formed on the outer peripheral surface, and a step portion 20b formed on the inner peripheral surface side. The fitting convex portion 20 a is formed to fit the fitting concave portion 14 a of the outer plug 1 and fix the inner plug 2 to the outer plug 1 when the inner plug 2 is fitted into the outer plug 1.

  The cylindrical wall 21 is formed with a thickness sufficient to have flexibility and an easily flexible portion. In the present invention, the term “flexible” refers to having flexibility that is at least high enough to be deformed following the shrinkage of the thermoplastic elastomer. In the present embodiment, the cylindrical wall 21 is formed such that the upper end portion 21a is thinner than the lower end 21b, that is, an easily flexible portion is formed on the upper end 21a side. In addition, the outer peripheral surface 21 c and the inner peripheral surface 21 d are both inclined and the outer peripheral surface of the upper end 21 a is chamfered so that the inner tube 2 can be easily fitted into the outer tube 1. Yes.

  The elastomer plug 3 is made of a thermoplastic elastomer. After the inner plug 2 is inserted into a molding die in advance, the molten thermoplastic elastomer is injected onto the stepped portion 20b of the inner plug 2 and into the cylindrical wall 21 after injection filling. It is molded by cooling (insert molding method). For this reason, the side surface 30 a of the main body 30 of the elastomer plug 3 is fused to the inner peripheral surface 21 d of the cylindrical wall 21 over substantially the entire surface. That is, the side surface 30 a of the main body 30 is covered with the cylindrical wall 21 of the inner plug 2. In addition, a needle piercing surface 31 for a user to pierce an injection needle (not shown) or the like is formed at the center of the upper surface 30b of the main body 30.

  In the present embodiment, a substantially frustoconical inclined step 32 is formed at the center of the upper surface 30b, and the inclined step 32 is fitted into the planned opening 12b when the cap C is assembled. The needle piercing surface 31 is provided on the upper surface of the inclined step portion 32, and a plurality of substantially hemispherical concave portions 33 are formed. The concave portion 33 is formed so as to be a guideline for the user to stab the injection needle and the like, and is formed shallower than the height of the inclined step portion 32.

The cap C of this embodiment is
(1) The inner plug 2 is formed by an existing molding method such as injection molding so that the cylindrical wall 21 is thinner at the upper end 21a side than at the lower end 21b side, that is, partially flexible. In addition, it is molded to a thickness that is flexible as a whole,
(2) The inner plug 2 is inserted into a molding die (not shown), and after the molten thermoplastic elastomer is injected and filled into the cylindrical wall 21 of the inner plug 2, the elastomer plug 3 and the inner plug 2 are cooled. Mold in one piece. At this time, the side surface 30 a of the elastomer plug 3 is fused to the inner peripheral surface 21 d of the cylindrical wall 21.
(3) After that, the inner plug 2 and the elastomer plug 3 are fitted into the separately molded outer plug 1, and the fitting concave portion 14a of the outer plug 1 and the fitting convex portion 20a of the inner plug 2 are fitted. Manufactured.

  In the present embodiment, during the step (2) for molding the elastomer plug 3, the cylindrical wall 21 of the inner plug 2 is formed with a thickness that is flexible, so that the elastomer during cooling is used. In response to the contraction of the plug 3, the cylindrical wall 21 can also be deformed. In particular, the cylindrical wall 21 is easily formed on the upper surface 30b side of the elastomer plug 3, which is prone to problems such as cracks, that is, its upper end 21ab is easily It is flexible and can be deformed following the deformation of the upper surface 30b of the elastomer plug 3. Therefore, problems such as cracks do not occur in the elastomer plug 3.

  In the present embodiment, the side surface 30a of the elastomer plug 3 is covered with the inner plug 2 and is not exposed. The problem of sticking does not occur.

  In the step (3) in which the inner plug 2 and the elastomer plug 3 are fitted into the outer plug 1, the side surface 30 a of the elastomer plug 3 is covered with the inner plug 2. The outer peripheral surface 21 c of the second cylindrical wall 21 can be slid on the inner peripheral surface 13 b of the side wall 13 of the outer plug 1, and the inner plug 2 and the elastomer plug 3 can be stored in a predetermined position in the outer plug 1. Therefore, this embodiment does not cause poor fitting.

  In addition, when the cap C is fixed to the container and used, a certain amount of urging force is always applied to the elastomer plug 3 so that the content liquid does not leak when the injection needle or the like is inserted or removed. Need to be. The cylindrical wall 21 of the inner plug 2 has a lower end 21b thicker than an upper end 21a, whereby the flexible portion is ensured while ensuring the urging force. New problems such as the above will not occur.

  A second embodiment of the present invention will be described with reference to FIG. The difference from the first embodiment is that a stepped cylindrical wall 21 </ b> A composed of a plurality of step portions is erected from the base portion 20 of the inner plug 2 instead of the inclined cylindrical wall 21. In addition, the member shown with the same code | symbol is the same as that of 1st Embodiment.

  The cylindrical wall 21A is formed with a thickness that does not impair flexibility, and includes a lower step portion 21e that is convex in the inner circumferential direction and an upper step portion 21f that is formed thinner than the lower step portion 21e. That is, in the present embodiment, the upper step portion 21f is a flexible portion that can be deformed following the contraction of the main body 30 of the elastomer plug 3, and the content liquid when the injection needle or the like is pierced by the lower step portion 21e. The above-described urging force for preventing leakage of water is ensured.

  A third embodiment of the present invention will be described with reference to FIG. The difference from the first embodiment is that a plurality of recesses 21h separated by ribs 21g are intermittently formed in the circumferential direction of the inner plug 2 on the upper end 21a side of the cylindrical wall 21 of the inner plug 2. In addition, the member shown with the same code | symbol is the same as that of 1st Embodiment.

  In this embodiment, the recess 21h is an easily flexible portion, and the recess 21h is deformed following the contraction of the elastomer plug 3, thereby preventing the upper surface 30b of the elastomer plug 3 from cracking, In addition to the lower end 21b side of the cylindrical wall 21, the urging force for preventing leakage of the content liquid when the injection needle or the like is inserted is secured by the rib 21g.

  The rib 21g and the recess 21h may be formed at least on the upper end 21a side of the cylindrical wall 21, and may be formed from the upper end 21a side to the lower end 21b side. The recess 21h only needs to be flexible, and the thickness of the rib 21g can be appropriately designed. For example, the rib 21g can be formed so as to protrude from the cylinder wall 21, It can also be formed flush with the wall 21.

  The present invention is not limited to the above embodiment. For example, as shown in FIG. 9, instead of the pull-top type sealing film part 10, a sealing type sealing film part 15 attached to the outer plug 1 may be provided. In addition, the inclined step portion 32 and the like are not necessarily provided. And other composition can be changed suitably.

C cap 1 outer plug 10 pull-top type sealing film part 10a pull-top 10b sealing film part 10c lower surface peripheral edge part 11 thin wall part 12 top wall 12a peripheral edge part 12b planned opening part 12c lower surface 13 side wall 13a lower end 13b inner peripheral surface 14 flange part 14a fitting Concave part 15 Seal type sealing film part 2 Inner plug 20 Base part 20a Fitting convex part 20b Step part 21 Cylindrical wall 21a Upper end 21b Lower end 21c Outer peripheral surface 21d Inner peripheral surface 21e Lower step part 21f Upper step part 21g Rib 21h Recess 3 Elastomer plug 30 Main body 30a Side surface 30b Upper surface 31 Needle stick surface 32 Inclined step portion 33 Concave portion

Claims (9)

An outer plug,
An inner plug having a cylindrical wall and fitted into the outer plug;
A cap having an elastomer plug, the side surface of which is fused to the entire inner peripheral surface of the cylindrical wall;
The cylindrical wall has flexibility, and an easily flexible portion is formed on an upper end side thereof.   The cap according to claim 1, wherein the cylindrical wall is formed such that an upper end side is thinner than a lower end side, and the upper end side of the cylindrical wall is the flexible portion.   The cap according to claim 2, wherein at least one of the outer peripheral surface and the inner peripheral surface of the cylindrical wall is inclined.   The cap according to claim 3, wherein both the outer peripheral surface and the inner peripheral surface of the cylindrical wall are inclined.   The cap according to claim 2, wherein an inner peripheral surface of the cylindrical wall is stepped.   2. The cap according to claim 1, wherein a plurality of recesses are intermittently formed in a circumferential direction on at least an upper end side of the cylindrical wall, and the recesses serve as the flexible portion. .   The cap according to any one of claims 1 to 6, wherein the elastomer plug has an inclined step portion at the center of the upper surface, and a needle piercing surface is formed on the inclined step portion.   The cap according to any one of claims 1 to 7, wherein a side wall of the outer plug is formed thicker than a lower end of the cylindrical wall. A cap manufacturing method comprising an outer plug, an inner plug, and an elastomer plug,
Molding the inner plug into a thickness that is flexible and molding the upper end side to be more flexible than the lower end side;
Insert molding an elastomer plug into the inner plug;
And a step of fitting the inner plug and the elastomer plug into the outer plug while sliding the outer peripheral surface of the inner cylinder on the inner peripheral surface of the outer plug.

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