JP2003118766A - Needlestick cap and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needlestick cap which can prevent the generation of a burr without scratching an outer tube and its production. SOLUTION: An outer tube 10 comprises a tubular main body 11 having a needlestick part 20 and is made of a thermoplastic synthetic resin such as polyethylene or polypropylene. Roughly on the center of the inside peripheral face of the tubular main body 11 an annular rib 12 for molding is formed protrusively, and on the outer side edge of the bottom side of the same an annular rib 13 for connection is formed. In producing the same, a molded outer tube 10 is positioned in molds 1, 2 for clamping. Here, the annular rib 12 of the outer tube 10 presses the top end face of the mold 1 for sealing the gap between the tube 10 and the mold 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle stick stopper used for a liquid container into which a needle is inserted from the outside and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there is a needle stick stopper having a needle stick portion for sticking an injection or drip needle into a drug solution bottle or bag containing a medical drug solution. That is, as shown in FIG. 5A, it is a needle stick plug in which one end of an outer cylinder 10 made of a thermoplastic synthetic resin is filled with a thermoplastic elastomer to form a needle stick portion 20. As a method of forming the needle stick plug, the outer cylinder 10 is formed in the injection molds 1 and 2 after forming the outer cylinder 10 with a thermoplastic synthetic resin in an injection mold not shown.
Was manufactured by injection-molding a thermoplastic elastomer on one end side (Fig. 5B).

However, in the above-mentioned manufacturing method, when the thermoplastic elastomer is injection-molded, there is a minute gap between the inner peripheral surface of the outer cylinder 10 and the outer peripheral surface of the injection molding die 1, so that Elastomer may penetrate into the gaps to form burrs and impair the appearance of the product. On the other hand, when the die 1 has an outer dimension in which the gap is completely eliminated, there is a problem that the die 1 damages the outer cylinder 10 when the outer cylinder 10 is clamped.

In view of the above problems, it is an object of the present invention to provide a needle stick stopper capable of preventing the occurrence of burrs without damaging the outer cylinder, and a method for manufacturing the same.

[0005]

In order to achieve the above object, a needle puncture plug according to the present invention has a needle puncture part formed by filling one end of an outer cylinder made of a thermoplastic synthetic resin with a thermoplastic elastomer. In the above, the annular rib for molding is provided so as to project from the inner peripheral surface of the outer cylinder.

Therefore, according to the present invention, since the molding annular rib is pressed against the molding die, the elastomer cannot penetrate into the gap between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the mold, and burrs are generated. Prevent.

The thermoplastic elastomer may be composed of at least one selected from styrene elastomer and / or olefin elastomer.

Further, in the method for manufacturing a needle puncture plug according to the present invention, after forming an outer cylinder having a molding annular rib projecting on the inner peripheral surface from a thermoplastic synthetic resin, a thermoplastic elastomer is provided on one end side of the outer cylinder. May be injection-molded to heat-bond the needle stick portion to the outer cylinder. According to the present invention, it is possible to prevent the occurrence of burrs, and at the same time as injection-molding an elastomer, the outer cylinder and the needle stick portion can be integrated by heat fusion, and a highly productive method of manufacturing a needle stick stopper can be obtained. is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS. As shown in FIG. 1A, the first embodiment according to the present invention includes an outer cylinder 10 and a needle stick part 20.

The outer cylinder 10 is composed of a cylindrical main body 11 which holds the needle stick portion 20, and is formed of a thermoplastic synthetic resin such as polyethylene or polypropylene. And
The tubular main body 11 has a molding annular rib 12 projecting substantially at the center of the inner peripheral surface thereof, and a connecting annular rib 13 formed at the outer edge on the lower side.

The needle stick portion 20 may be formed by filling a thermoplastic elastomer from the upper opening portion of the outer cylinder 10 or may be formed by filling the opening portion opposite to the step portion 12. Good. The thermoplastic elastomer is selected from, for example, styrene-based elastomers and olefin-based elastomers, and can be used alone or in combination thereof.

Next, a method of manufacturing the needle stick stopper will be described. The method for manufacturing the needle stick stopper according to the present embodiment,
For example, as shown in FIG. 2, the molded outer cylinder 10 is positioned in the molding dies 1 and 2 and clamped. At this time, the molding annular rib 12 of the outer cylinder 10 is pressed against the upper end surface of the mold 1,
The gap between the outer cylinder 10 and the mold 1 is sealed. For this reason, the elastomer cannot enter the gap between the outer cylinder 10 and the mold 1, and the occurrence of burrs can be prevented. In particular, according to this embodiment, since the upper end surface of the mold 1 is flat, there is an advantage that it can be applied to a molding annular rib having various shapes and is convenient.

The needle stick portion 20 has upper and lower surfaces 21,
Although each of 22 is a flat surface, the lower surface 22 may be provided with a diaphragm 23 for enhancing the antifouling property afterwards (FIG. 1).
B).

In the above-described embodiment, the upper and lower surfaces 21,
Although the case where 22 is a flat surface is shown, the invention is not limited to this, and the lower surface 22 may bulge downward in a convex shape so as to prevent liquid leakage after the needle is pierced and withdrawn (( Figure 1C). At this time, the maximum thickness of the needle stick part 20 is 3 m.
m to 15 mm, particularly 5 mm to 13 mm are suitable.
Also, the thickness difference between the maximum thickness and the minimum thickness on one side is 0.1 m.
m-8 mm, especially 0.5 mm-5 mm are suitable.
Within the above numerical range, it is possible to prevent liquid leakage even after the needle is pierced and pulled out.

At least one of the upper and lower surfaces 21 and 22 may have a concave curved surface. Further, the surface shapes of the upper and lower surfaces 21 and 22 may be a combination of convex and concave curved surfaces as required.

In the second embodiment, as shown in FIG. 3A, the annular rib 12 of the outer cylinder 10 is inclined downward, and
This is a case where the lower surface 22, which is the liquid contact surface of the needle stick portion 20, is bulged downward. According to the present embodiment, since the annular rib 12 is likely to incline inward, the annular rib 12 is more easily bent than in the first embodiment, and the sealing property is improved.
There is an advantage that burr can be more surely prevented.

A diaphragm 23 may be attached integrally to the lower surface 22 which is the liquid contact surface of the needle stick portion 20 (FIG. 3).
B). In addition, the lower surface 22 that is the liquid contact surface of the needle stick portion 20.
May be a flat surface (FIG. 3C).

In the third embodiment, as shown in FIG. 4A, a cylindrical annular rib 12 having a step is formed at the upper opening edge of the inner peripheral surface of the cylindrical main body 11. According to the present embodiment, even when the needle stick portion 20 is injection-molded on the one end side of the outer cylinder 10, the lower end surface 12a of the rib 12 is pressed against the upper end surface of the molding die (not shown), The gap existing between the mold and the tubular body 11 is sealed. Therefore, there is an advantage that the elastomer cannot penetrate into the gap and burr does not occur.

In the third embodiment, as shown in FIG. 4B, the diaphragm 23 may be attached integrally to the lower surface 22 bulging below the needle stick portion 20.

[0020]

According to the present invention, since the molding annular rib is pressed against the molding die, the elastomer cannot penetrate into the gap between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the mold, and burrs are generated. The effect is to prevent.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment according to the present invention, in which FIG. A shows a case where the bottom surface of a needle stick part is a flat surface,
Figure B shows a case where a diaphragm is attached to the bottom of the needle stick,
FIG. C shows the case where the bottom surface of the needle stick portion is a bulging surface.

FIG. 2 is a cross-sectional view showing the method of manufacturing the needle puncture stopper according to the first embodiment.

FIG. 3 is a cross-sectional view of a second embodiment according to the present invention, in which FIG. A shows a case where the bottom surface of the needle stick portion is a bulging surface,
Figure B shows a case where a diaphragm is attached to the bottom of the needle stick,
FIG. C shows the case where the bottom surface of the needle stick portion is a flat surface.

FIG. 4 is a cross-sectional view of a third embodiment according to the present invention, in which FIG. A shows a case where the bottom surface of the needle stick portion is a bulging surface,
FIG. B shows a case where a diaphragm is attached to the bottom surface of the needle stick part.

5A and 5B show a needle puncture plug according to a conventional example, FIG. A being a sectional view and FIG. B being a sectional view showing a manufacturing process.

[Explanation of symbols]

1, 2 ... Mold, 10 ... Outer cylinder, 11 ... Cylindrical body, 12 ... Molding annular rib, 13 ... Connection annular rib, 20 ... Needle piercing portion, 21 ... Upper surface, 22 ... Lower surface (wetted surface), 23 ... diaphragm.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) A61J 1/00 315B (72) Inventor Ai 12-11 Flora Sakai 7-107 F, Sakai City, Osaka Prefecture Term (reference) 3E084 AA04 AA06 AA12 AB05 BA02 CA01 CC03 DA01 DB20 DC04 DC05 FA09 FD13 HD01 KB01 LA30 LD30 4F206 AA09 AA45 AD05 AD12 AD24 AG27 AG28 AH57 AH63 JA07 JB12 JF05

Claims (3)

[Claims] 1. A needle puncture plug in which a thermoplastic elastomer is filled into one end of an outer cylinder made of a thermoplastic synthetic resin to form a needle puncture portion, wherein a molding annular rib is provided on an inner peripheral surface of the outer cylinder. A needle puncture stopper. 2. A needle puncture plug, wherein the thermoplastic elastomer comprises at least one selected from styrene elastomer and olefin elastomer. 3. An outer cylinder is formed from a thermoplastic synthetic resin by forming a molding annular rib on an inner peripheral surface of the outer cylinder, and then a thermoplastic elastomer is injection-molded on one end side of the outer cylinder to form an outer cylinder on the outer cylinder. A method for producing a needle stick plug, characterized in that the needle stick part is heat-sealed.