JP4549729B2 - Medical cap and method for producing the same - Google Patents

Description

  The present invention relates to a medical cap used for infusion bottles and the like and a method for producing the same, and more particularly to a medical cap whose plug is made of a thermoplastic elastomer resin.

  Conventionally, in order to be able to take out the infusion (blood, drug solution, etc.) from an infusion bottle or the like with a needle, a cap provided with a needle stab stopper inside the synthetic resin outer frame is used. The medical cap composed of the plug body and the outer frame body generally has a structure in which the plug body is incorporated into a substantially cylindrical outer frame body.

  In medical caps, the plug and the outer frame may peel off when the needle is inserted or removed, which may affect the sealing performance of the infusion solution or the plug may come off together when the needle is removed. It is necessary to ensure sufficient adhesion between the plug and the outer frame.

  Therefore, since the plug body is made of rubber and has high elasticity, the adhesion between the plug body and the outer frame body can be secured. However, after the plug body is vulcanized and molded, a process of washing the plug body is required. For this reason, the manufacturing process is complicated, which causes an increase in cost.

On the other hand, when the plug body is made of an elastomer resin, it can be molded in a clean environment, so that a cleaning process is unnecessary and a series of processes can be incorporated into the cap production process line. However, since the elastomer resin has a large residual strain and is inferior in elasticity compared to rubber, there is a problem in the adhesion between the stopper and the outer frame. (Patent Document 1).
Japanese Patent Laid-Open No. 11-4873

  However, in the prior art in which the plug body is made of an elastomer resin, the plug body has a prismatic shape and cannot be formed into a columnar shape similar to a rubber plug body. For this reason, the inner wall of the outer frame body that holds the stopper cannot be formed into a cylindrical shape. For this reason, a new mold is required to use the above technique. In addition, if the plug is made into a prismatic shape with a fistula, the uniformity of the resin flow at the time of molding is inferior to that of a cylindrical shape. The effort to find out is required. In other words, the introduction of the method for providing the above-mentioned fist increases the initial cost, which is expensive. Under such circumstances, the cap is a medical cap using an elastomer resin as a material while maintaining the substantially cylindrical shape of the conventional plug, and has a holding force that can prevent needle removal and a resealability to prevent liquid leakage. There was a need for excellent technology.

  An object of the present invention is to provide a medical cap having improved adhesion between a thermoplastic elastomer resin plug and an outer frame, and a method for producing the same.

  As a result of intensive studies to solve the above problems, the invention according to claim 1 is a medical cap including a plug body and an outer frame body, and the plug body is made of an elastomer resin having a substantially cylindrical shape. In addition, the outer frame body is made of a synthetic resin and has a cylindrical portion, and at least a cylindrical side surface portion of the plug body is a medical cap attached to the inner wall of the cylindrical portion of the outer frame body.

  Since the cylindrical side surface portion of the plug body is bonded to the inner wall of the cylindrical portion of the outer frame body, the adhesion between the plug body and the outer frame body is improved, and infusion leakage and removal of the plug body can be prevented.

  According to a second aspect of the present invention, the outer frame body further has a ridge portion extending inward from the inner wall of the cylindrical portion, and the top surface side edge portion and / or the bottom surface side edge portion of the plug body is the outer surface. It was set as the medical cap of Claim 1 attached to the said protrusion part of the frame.

  Furthermore, since the protrusions of the outer frame body and the upper surface side edge part and / or the bottom surface side edge part of the plug body are joined together, the adhesion is further improved, infusion leakage and plug body removal. Can be prevented more effectively.

  The invention according to claim 3 is a medical cap provided with a plug body and an outer frame body, wherein the plug body is made of an elastomer resin having a large-diameter portion cylindrical portion and a small-diameter portion cylindrical portion. The frame body is made of synthetic resin, has a cylindrical portion, and at least the side surface portion of the small-diameter column portion of the plug body is on the inner wall of the cylindrical portion of the outer frame body, on the small-diameter column portion side of the large-diameter column portion of the plug body. The side edges were medical caps bonded to the cross-sections of the cylindrical portions of the outer frame.

  The plug body has a structure with a large-diameter cylindrical portion and a small-diameter cylindrical portion, and the side edge of the large-diameter cylindrical portion of the plug body on the side of the small-diameter cylindrical portion is attached to the end section of the cylindrical portion of the outer frame. Therefore, the adhesion between the plug and the outer frame is further improved.

  In the invention according to claim 4, the diameter of the large-diameter column portion is larger than the outer diameter of the cylindrical portion of the outer frame body, and the cylindrical portion extends from the side edge portion of the large-diameter column portion on the small-diameter column portion side, The medical cap according to claim 3, wherein an inner wall of the cylindrical portion of the plug is bonded to an outer wall of the cylindrical portion of the outer frame.

  Since the large-diameter columnar part has a cylindrical part extending from the side edge part on the small-diameter columnar part side, the cylindrical part inner wall of the plug body is joined to the cylindrical part outer wall of the outer frame body. Adhesion with the frame is further improved.

  According to a fifth aspect of the present invention, a plug body made of an elastomer resin having a substantially cylindrical shape is loaded into a pair of molds, and a cylindrical upper surface portion and a bottom surface portion of the plug body are brought into close contact with the pair of molds, A cylindrical cap was formed adjacent to the cylindrical side surface of the body, a synthetic resin raw material was filled into the cylindrical cavity, and a method for manufacturing a medical cap was formed by molding a synthetic resin outer frame.

  When the plug is made of an elastomer resin, it can be molded in a clean environment, so that a cleaning step is unnecessary. A series of processes can be incorporated into the cap production process line, and the manufacturing process can be further simplified. Further, since the outer frame body can be integrally formed, the manufacturing process can be simplified. In addition, since the synthetic resin raw material of the outer frame body is melted and bonded to the cylindrical side surface portion of the elastomer resin plug body, and the outer frame body is molded, the adhesion between the plug body and the outer frame body is improved. Medical caps can be manufactured.

  According to a sixth aspect of the present invention, a plug body made of an elastomer resin having a substantially cylindrical shape is loaded into a pair of molds, and the center part of the cylindrical upper surface portion and the bottom surface portion of the plug body is brought into close contact with the pair of molds. A cylindrical cavity including a substantially cylindrical U-shape or a substantially L-shaped cross section adjacent to the cylindrical upper surface portion and / or the bottom edge portion of the plug body and the cylindrical side surface portion is formed in the cylindrical cavity. A method for producing a medical cap in which a synthetic resin raw material is filled and an outer frame body made of synthetic resin is molded.

  Similarly to the invention according to claim 7, since the outer frame body can be integrally formed, the manufacturing process can be simplified. Further, in addition to the cylindrical side surface portion, the cylindrical upper surface portion and / or the side edge portion of the bottom surface portion and the synthetic resin raw material of the outer frame body are melted and bonded together to form the outer frame body. A medical cap with improved adhesion between the plug and the outer frame can be produced.

  According to an eighth aspect of the present invention, an outer frame body made of synthetic resin having a cylindrical shape is loaded into a mold, one opening of the outer frame body is closed, and the elastomer resin raw material is removed from the other opening. It was set as the manufacturing method of the medical cap which inserts in the frame body, presses the said elastomer resin raw material, and shape | molds the plug body made from an elastomer resin.

  By pressing the elastomer resin raw material, the plug body is molded inside the outer frame body. However, since the elastomer resin raw material is melted and bonded to the outer frame body, the adhesion between the plug body and the outer frame body is improved. An enhanced medical cap can be produced. The pressing method can be performed by a pressing method such as compression molding.

  According to the present invention, since the molded medical cap is fixed by fixing at least the cylindrical side surface portion of the plug body to the inner wall of the outer frame, the plug body can be detached or detached even when the needle is inserted or removed. This is a medical cap with no infusion leakage. In addition, since the plug body is made of an elastomer resin, the cleaning process can be omitted, and the outer frame body can be molded in a series of processes, thereby greatly simplifying the manufacturing process.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1-1 (a) is a view showing a cross section of the medical cap according to the present invention. The plug 1 of the medical cap 30 is an elastomer resin plug having a substantially cylindrical shape. The outer frame body 6 is made of a synthetic resin integrally molded, has a cylindrical portion 6a and a flange portion 7, and has a substantially L-shaped cross section. Since the cylindrical side surface portion 4 of the plug body 1 is bonded to the inner wall 8 of the outer frame body 6, the infusion leakage can be prevented without the plug body 1 being peeled off or detached even when the needle is inserted or removed. .

  1-1 (b) is a view showing a cross section of another embodiment of the medical cap according to the present invention. The plug 1 of the medical cap 30 is an elastomer resin plug having a substantially cylindrical shape. The outer frame body 6 is made of an integrally molded synthetic resin, has a cylindrical portion 6a and a flange portion 7, and has protrusions 9a and 9b extending inward from the inner wall 8 of the cylindrical portion 6a. Therefore, a part of the cross section is substantially U-shaped by the cylindrical portion 6a and the protruding portions 9a and 9b.

  In addition to the cylindrical side surface portion 4 of the plug body 1 being bonded to the inner wall 8 of the outer frame body 6, the side edge portion 3 a of the top surface portion 1 a and the side edge portion 3 b of the bottom surface portion 1 b are respectively protruding portions. It is attached to 9a and 9b. Therefore, since the plug body 1 is more firmly fixed, it is possible to prevent infusion leakage without the plug body 1 being peeled off or detached even when the needle is inserted or removed.

  As in the other embodiment shown in FIG. 1-1 (c), the protruding portion extending inward from the inner wall of the cylindrical portion 6a is only 9b, and a part of the cross section is substantially L-shaped. Good. The cylindrical side surface portion 4 of the plug body 1 is bonded to the inner wall 8 of the outer frame body 6, and the side edge portion 3b of the bottom surface portion 1b of the plug body 1 is bonded to the ridge portion 9b. Also in this case, since the plug body 1 is more firmly fixed, it is possible to prevent the plug body 1 from coming off and infusion leakage. In addition, although not shown in figure, it is good also as a structure which makes the protrusion part only 9a, and the side edge part 3a of the upper surface part 1a of the stopper 1 is each joined to the protrusion part 9a.

  Moreover, as shown to FIG. 1-2 (a), the stopper 1 is good also as a structure provided with the large diameter cylindrical part 1c and the small diameter cylindrical part 1d. The side surface portion 4 a of the small-diameter columnar portion 1 d of the plug body 1 is joined to the inner wall 8 of the cylindrical portion 6 a of the outer frame body 6. Further, the side edge portion 4 b on the small-diameter cylindrical portion 1 d side of the large-diameter cylindrical portion 1 c of the plug body 1 is joined to the end section 6 b of the cylindrical portion 6 a of the outer frame body 6. Therefore, since the plug 1 is more firmly fixed, it is possible to prevent the plug 1 from coming off and infusion leakage. Moreover, as shown in FIG. 1-2B, the diameter of the large-diameter cylindrical portion 1c may be larger than the outer diameter of the outer frame body 6.

  Furthermore, as shown in FIG. 1-2 (c), a cylindrical portion 1e extends from a side edge portion of the large-diameter column portion 1c of the plug body 1 on the small-diameter column portion 1d side, and an inner wall 4c of the cylindrical portion 1e of the plug body 1 is obtained. Can be a medical cap attached to the outer wall 18 of the cylindrical portion 6 a of the outer frame body 6. Since the plug body 1, the inner wall 8 of the cylindrical portion 6a of the outer frame body, the end cross section 6b, and the outer wall 18 are bonded together, the adhesion between the plug body and the outer frame body is further improved, and the plug body 1 can be prevented from coming off and leakage of infusion.

  The flange 7 of the outer frame 6 is attached to an infusion bag (not shown) by welding or the like.

  Examples of the thermoplastic elastomer resin that is the raw material of the plug body 1 include olefin-based, styrene-based, polyurethane-based, polyester-based, polyvinyl chloride-based, polybutadiene-based thermoplastic elastomer resins, However, it is not limited to these. The synthetic resin for the outer frame 6 is preferably a thermoplastic resin. Specifically, synthetic resins conventionally used for medical use such as polyethylene, polypropylene, and PET resins are preferable, but are not limited thereto.

  Next, the manufacturing method of the medical cap which concerns on this invention is demonstrated. FIG. 2-1 is a diagram showing an embodiment of a production method according to the present invention. In FIG. 2 (a), a pre-molded plug 1 made of an elastomer resin is loaded into a mold 10, and a cylindrical bottom surface portion 1 b is in close contact with the mold 10.

  As shown in FIG. 2B, the mold 11 approaches the mold 10 and is closed. The cylindrical upper surface portion 1 a is in close contact with the mold 11. Further, when the molds 10 and 11 are closed, the side surface portion 4 of the plug 1 is not in close contact with the molds 10 and 11. Therefore, a cylindrical cavity 5 adjacent to the side surface portion 4 of the plug body 1 is formed inside the molds 10 and 11. In this state, the synthetic resin raw material 20 is filled into the cylindrical cavity 5 through gates (not shown) opened in the molds 10 and 11. The synthetic resin raw material 20 is melted and bonded to the cylindrical side surface portion 4 of the elastomer resin plug body 1 to form the outer frame body 6. Finally, as shown in FIG. 2C, a medical cap is manufactured.

  FIG. 3 shows another embodiment of the manufacturing method according to the present invention. In FIG. 3 (a), a pre-molded plug 1 made of an elastomer resin is loaded into a mold 10, and the central portion 2b of the cylindrical bottom surface portion 1b is in close contact with the protruding portion 10a of the mold 10, and the side edge portion 3b. Are not in close contact.

  As shown in FIG. 3B, the mold 11 approaches the mold 10 and is closed. The central portion 2a of the cylindrical upper surface portion 1a is in close contact with the protruding portion 11a of the mold 11, and the side edge portion 3a is not in close contact. Further, when the molds 10 and 11 are closed, the side surface portion 4 of the plug 1 is not in close contact with the molds 10 and 11. Accordingly, a cylindrical cavity 5 having a substantially U-shaped cross section is formed inside the molds 10 and 11. The cylindrical cavity 5 is adjacent to the side edges 3 a and 3 b and the side surface 4 of the plug body 1. In this state, the synthetic resin raw material 20 is filled into the cylindrical cavity 5 through gates (not shown) opened in the molds 10 and 11. At this time, in addition to the cylindrical side surface portion 4, the cylindrical upper surface portion 1a of the plug body 1 and the side edge portions 3a, 3b of the bottom surface portion 1b and the synthetic resin raw material 20 are melted and bonded together, and the ridge portion 9a and The outer frame body 6 provided with 9b is molded, and as shown in FIG. 3C, the outer frame body 6 is molded and a medical cap is manufactured.

  Note that a cavity adjacent to any one of the side edge portions 3a and 3b of the plug 1 can be omitted. For example, if the cavity adjacent to the side edge 3a of the plug 1 is omitted, the medical cap shown in FIG. 1 (c) is manufactured. Further, the plug 1 is molded in advance, and the method is not limited, but compression molding, injection molding, and the like are preferable. In the case of the manufacturing method according to FIGS. 2 and 3, the manufacturing method in the case where the outer frame body 6 includes the flange portion 7 has been described. However, the flange portion 7 may be omitted and molded.

  FIG. 4 is a diagram showing another embodiment of the manufacturing method according to the present invention. In FIG. 4A, a pre-molded synthetic resin outer frame body 6 is loaded into a mold 13. The mold 13 closes the opening 16 a of the outer frame body 6. Then, as shown in FIG. 4B, the elastomer resin material 22 is loaded into the outer frame body 6 from the opening 16b that is not closed. Next, as shown in FIG. 4 (c), another mold 14 presses the raw material 22, and the raw material 22 is filled in the outer frame 6, and as shown in FIG. 14 and the outer frame body 6 form the plug body 1. At this time, since the elastomer resin raw material 22 is melted and bonded to the inner wall of the outer frame body 6 and the plug body 1 is molded, a medical cap with improved adhesion between the plug body 1 and the outer frame body 6 is obtained. Manufactured.

  Moreover, FIG. 5 shows a manufacturing method when the outer frame body 6 has the protrusion 9a. In FIG. 5 (a), a pre-molded synthetic resin outer frame body 6 is loaded into a mold 13. The mold 13 has a protrusion 13a, and the protrusion 13a is formed by a protrusion 9a. The opening 16a is closed. 5B to 5C, the elastomer resin raw material 22 is loaded into the outer frame body 6 as described above, and the plug body 1 is molded by the molds 13 and 14 and the outer frame body 6.

  Similarly, the medical cap shown in FIG. 1-2 (a) can be manufactured. In FIG. 6A, a pre-molded synthetic resin outer frame body 6 is loaded in a mold 13. An end section 6b of the cylindrical portion 6a of the outer frame 6 and the mold 13 are spaced apart from each other, and the opening 16a is closed by the mold 13. Then, the elastomer resin raw material 22 is loaded into the outer frame body 6 from the opening 16b that is not closed.

  Next, as shown in FIG. 6 (b), another mold 14 presses the raw material 22, and the raw material 22 is filled into a cavity surrounded by the inner wall 8 of the outer frame 6 and the mold 13. As shown in FIG. 6 (c), the plug body 1 is molded by the molds 13 and 14 and the outer frame body 6. At this time, since the elastomer resin raw material 22 is melted and bonded to the inner wall 8 and the end cross section 6b of the cylindrical portion 6a of the outer frame body 6 to form the plug body 1, the close contact between the plug body 1 and the outer frame body 6 A medical cap with enhanced properties is produced.

  FIG. 7 shows a method for manufacturing the medical cap shown in FIG. In FIG. 7A, a pre-molded outer frame body 6 made of synthetic resin is loaded in the mold 13, but the end section 6 b of the cylindrical portion 6 a of the outer frame body 6 is spaced from the mold 13. The opening 16 a is closed by the mold 13. Moreover, the bottom of the mold 13 is larger than the outer diameter of the outer frame body 6. Similarly, the elastomer resin raw material 22 is loaded into the outer frame body 6 from the opening 16b that is not closed.

  Next, as shown in FIG. 7B, another mold 14 presses the raw material 22, and the raw material 22 is inside the cavity surrounded by the inner wall 8 and the end cross section 6 b of the outer frame body 6 and the mold 13. However, the raw material 22 is also filled outside the outer frame 6. Finally, as shown in FIG. 7C, the plug 1 is molded by the molds 13 and 14 and the outer frame 6. Similarly, since the elastomer resin raw material 22 is melted and bonded to the inner wall 8 and the end cross section 6b of the cylindrical portion 6a of the outer frame body 6 to form the plug body 1, the adhesion between the plug body 1 and the outer frame body 6 A medical cap with a higher height is produced.

  FIG. 8 shows a method for manufacturing the medical cap shown in FIG. In FIG. 8A, a pre-molded synthetic resin outer frame body 6 is loaded in the mold 13, but the end section 6 b of the cylindrical portion 6 a of the outer frame body 6 is spaced from the mold 13. The opening 16 a is closed by the mold 13. Similarly, the bottom portion of the mold 13 is larger than the outer diameter of the outer frame body 6, and the elastomer resin material 22 is loaded into the outer frame body 6 from the opening 16 b that is not closed.

  Next, as shown in FIG. 8B, another mold 14 presses the raw material 22, and the raw material 22 is surrounded by the inner wall 8, the outer wall 18, the end section 6 b and the mold 13 of the outer frame body 6. However, the raw material 22 is also filled outside the outer frame 6. Finally, as shown in FIG. 8C, the plug body 1 is molded by the molds 13 and 14 and the outer frame body 6. Similarly, since the elastomer resin raw material 22 is melted and bonded to the inner wall 8, the outer wall 18, and the end cross section 6 b of the cylindrical portion 6 a of the outer frame body 6 to form the plug body 1, the plug body 1 and the outer frame body 6 A medical cap with improved adhesion is produced.

  In the case of the manufacturing method according to FIGS. 4 to 8, the molding method of the outer frame body 6 molded in advance is not limited, but compression molding, injection molding, and the like are preferable. Similarly, a medical cap is manufactured for the outer frame 6 that does not include the flange portion 7.

It is sectional drawing which shows one Embodiment of the medical cap which concerns on this invention. It is sectional drawing which shows other embodiment of the medical cap which concerns on this invention. It is a figure which shows one Embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention. It is a figure which shows other embodiment of the manufacturing method of the medical cap which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug body 6 Outer frame body 7 Flange part 10, 11 Mold 13, 14 Mold 20 Synthetic resin raw material 22 Elastomer resin raw material 30 Medical cap

Claims (1)

Have a cylindrical shape, the outer frame body made of synthetic resin having a cross-sectional end and the inner wall, was charged into a mold in a state in which distance to said end section is vacant,
One opening portion of the outer frame body is closed, an elastomer resin raw material is loaded into the outer frame body from the other opening portion, the elastomer resin raw material is pressed, and the inner wall and end cross section of the outer frame body are pressed. A method for producing a medical cap in which a plug made of an elastomer resin is molded so as to be melted and bonded together .

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