[0001]The present invention relates to a syringe cap assembly.
Background technology
[0002]A prefilled syringe in which a liquid preparation is aseptically filled in a syringe is known. For example, Japanese Patent Application Laid-Open No. 2007-29561 (Patent Document 1) discloses a technique relating to this prefilled syringe.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2007-29561
Outline of the invention
Problems to be solved by the invention
[0004]
　In the prefilled syringe, a syringe cap assembly is attached to the discharge port at the tip of the syringe. Specifically, the syringe cap assembly includes a lock collar and a plastic cap. The lock collar is attached directly to the discharge port at the tip of the syringe. The plastic cap is fixed to the lock collar by tightening by screwing. A rubber cap is incorporated in the plastic cap, and the rubber cap abuts on the plastic cap so as to cover the discharge port at the tip of the syringe, thereby ensuring the liquidtightness of the discharge port at the tip of the syringe.
[0005]
　The prefilled syringe in which the liquid product is filled in the syringe is transported in an individually packaged state, but the plastic cap may vibrate slightly due to vibration during transportation or the like, and the fastening to the lock collar may be loosened. In this case, the sterility of the liquid product is threatened.
[0006]
　The present invention has been made in view of the above problems, and an object of the present invention is to provide a syringe cap assembly having a configuration capable of suppressing loosening of a fastening of a plastic cap to a lock collar.
Means to solve problems
[0007]
　In this syringe cap assembly, the syringe cap assembly is attached to the discharge port at the tip of the syringe, and the lock collar attached to the discharge port at the tip of the syringe is screwed into the lock collar. A plastic cap to be tightened is provided, and a plurality of ridge ribs extending in the axial direction are provided on the outer surface of the lock collar along the circumferential direction, so that between the ridge ribs adjacent to each other along the circumferential direction. A plurality of concave grooves extending in the axial direction are defined, and the bottom of the outer surface of the plastic cap includes a protrusion extending toward the lock collar side, so that the tightening rotation of the plastic cap by screwing to the lock collar can be performed. At the finished stage, the protrusion is located in the recess groove between the ridge ribs.
[0008]
　In another form, the convex ribs are arranged on the outer surface of the lock collar at equal intervals, so that the concave grooves are also defined on the outer surface of the lock collar at equal intervals, and the protrusions are formed. Is located in the vicinity of the ridge rib located on the wake side when viewed from the rotation direction of the plastic cap at the stage where the tightening rotation of the plastic cap by screwing to the lock collar is completed.
[0009]
　In another form, the ridge ribs are arranged at eight positions at equal intervals on the outer surface of the lock collar.
[0010]
　In another form, the protrusions are provided at a total of two positions facing each other by 180 degrees.
The invention's effect
[0011]
　According to this syringe cap assembly, it is possible to provide a syringe cap assembly having a configuration capable of suppressing loosening of the fastening of the plastic cap to the lock collar.
A brief description of the drawing
[0012]
FIG. 1 is a diagram showing an overall configuration of a prefilled syringe according to an embodiment.
FIG. 2 is a perspective view showing a syringe cap assembly attached to the tip of the syringe of the embodiment.
FIG. 3 is a perspective view seen from the bottom surface side of the plastic cap of the embodiment.
4 is a cross-sectional view taken along the line IV-IV in FIG. 2. FIG.
5 is a cross-sectional view taken along the line VV in FIG. 4. FIG.
Embodiment for carrying out the invention
[0013]
　Hereinafter, the prefilled syringe of the embodiment will be described with reference to the drawings. When the number, quantity, etc. are referred to in the embodiments described below, the scope of the present invention is not necessarily limited to the number, quantity, etc., unless otherwise specified. The same reference number may be assigned to the same part or equivalent part, and duplicate explanations may not be repeated. It is planned from the beginning to use the configurations in the embodiments in appropriate combinations. In the figure, the actual dimensional ratios are not shown, but some ratios are shown differently in order to facilitate understanding of the structure.
[0014]
　(Prefilled Syringe 1)
　The configuration of the prefilled syringe 1 of the present embodiment will be described with reference to FIGS. 1 to 5. 1 is a view showing the overall configuration of the prefilled syringe 1, FIG. 2 is a perspective view showing a syringe cap assembly 10 attached to the tip of the syringe 11, and FIG. 3 is a view from the bottom surface side of the plastic cap 14a. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line V-V in FIG.
[0015]
　With reference to FIG. 1, the prefilled syringe 1 is a syringe 11 filled with a chemical solution or the like, a piston 12 inserted inside the syringe 11, and a syringe cap assembly attached to a discharge port at the tip of the syringe 11. It is equipped with 10.
[0016]
　The syringe cap assembly 10 includes a lock collar 13, a plastic cap 14 screwed into the lock collar 13, and a rubber cap 15 incorporated in the plastic cap 14.
[0017]
　The prefilled syringe 1 usually means a state after the inside of the syringe 11 is filled with a liquid preparation or the like. Therefore, FIG. 1 shows a state in which the piston 12 is pushed to the tip end side of the syringe 11, and shows a state in which the inside of the syringe 11 is not filled with the chemical solution. Even if there is, it shall be referred to as a prefilled syringe in this specification.
[0018]
　With reference to FIGS. 2 to 4, the syringe cap assembly 10 of the present embodiment has the lock collar 13, the plastic cap 14 screwed into the lock collar 13, and the plastic cap 14 as described above. Includes an interior rubber cap 15.
[0019]
　The plastic cap 14 and the plastic cap 14 include, for example, polyvinyl chloride, polyethylene, polypropylene, cyclic polyolefin, polystyrene, polyacetal, poly- (4-methylpenten-1), polycarbonate, acrylic resin, acrylonitrile-butadiene-styrene. Copolymers, polyesters such as polyethylene terephthalate, polyethylene naphthalate, butadiene-styrene copolymers, polyamides (eg, nylon 6, nylon 6/6, nylon 6/10, nylon 12), ethylene-vinyl alcohol copolymers, Resin materials such as polysulfone, polyallylsulfone, polyethersulfone, methacrylic-styrene copolymer, polyarylate, and styrene-acrylonitrile copolymer are used.
[0020]
　The rubber cap 15 includes, for example, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, acrylic rubber, ethylene-propylene rubber, hydrin rubber, urethane rubber, silicone rubber, and fluororubber. Various rubber materials, various thermoplastic elastomers such as styrene-based, polyolefin-based, polyvinyl chloride-based, polyurethane-based, polyester-based, polyamide-based, polybutadiene-based, transpolyisoprene-based, fluororubber-based, and chlorinated polyethylene-based, polyethylene. , A relatively flexible resin material such as vinyl chloride resin, or a combination thereof can be used.
[0021]
　On the outer surface of the cylindrical lock collar 13, a plurality of convex ribs 13a extending in the axial direction (arrow Y direction in the drawing) are provided along the circumferential direction. With this configuration, a plurality of recessed grooves 13b extending in the axial direction are defined between the convex ribs 13a adjacent to each other along the circumferential direction of the convex ribs 13a. In the present embodiment, the convex ribs 13a are arranged at eight positions on the outer surface of the lock collar 13 at equal intervals, but the present invention is not limited to this arrangement form, and the number and arrangement of the convex ribs 13a are not limited to this. The pitch and the like are appropriately changed according to the specifications.
[0022]
　Similar to the lock collar 13, a plurality of convex ribs 14a extending in the axial direction (arrow Y direction in the figure) are provided on the outer surface of the cylindrical plastic cap 14 along the circumferential direction. With this configuration, a plurality of recessed grooves 14b extending in the axial direction are defined between the convex ribs 14a adjacent to each other along the circumferential direction of the convex ribs 14a. An annular rib 14c surrounding the entire circumference is provided on the bottom side (lock collar 13 side) of the outer surface of the plastic cap 14.
[0023]
　In the present embodiment, the convex ribs 14a are arranged at eight positions on the outer surface of the plastic cap 14 at equal intervals, but the present invention is not limited to this arrangement form, and the number and arrangement of the convex ribs 14a are not limited to this. The pitch and the like are appropriately changed according to the specifications.
[0024]
　With reference to FIGS. 2 and 3, the bottom portion 14z of the outer surface of the plastic cap 14 is provided with a protrusion 14p extending toward the lock collar 13 side. In the present embodiment, the protrusions 14p are provided at a total of two positions facing each other by 180 degrees.
[0025]
　With reference to FIG. 4, a spiral screw thread 13n is provided on the inner peripheral surface of the tubular lock collar 13, and the outer circumference of the bottom tubular portion 14y extending from the bottom of the tubular plastic cap 14 toward the lock collar 13 side. The surface is provided with a screw thread 14n screwed to the spiral screw thread 13n. The above-mentioned rubber cap 15 is fitted on the inner peripheral surface 14h of the plastic cap 14.
[0026]
　A recess 15y extending in the axial direction is provided on the bottom surface side of the rubber cap 15, and when the plastic cap 14 is screwed and fastened to the lock collar 13, the recess 15y is in a liquid-tight state at the discharge port at the tip of the syringe 11. Will be pressed against.
[0027]
　With reference to FIGS. 2 and 5, at the stage where the tightening rotation of the plastic cap 14 by screwing to the lock collar 13 (in the direction of arrow R in FIG. 5) is completed, the protrusion 14p is between the convex ribs 13a. It is preferable that it is located in the recessed groove 13b. More preferably, as often shown in FIG. 5, it is preferable that the plastic cap 14 is in contact with the side wall of the convex rib 13a located on the wake side when viewed from the rotation direction.
[0028]
　As described above, according to the syringe cap assembly 10 in the present embodiment, the protrusion 14p is convex at the stage where the tightening rotation (direction of arrow R in FIG. 5) by screwing the plastic cap 14 to the lock collar 13 is completed. It is located in the recessed groove 13b between the strip ribs 13a. As a result, even if the plastic cap 14 is loosened with respect to the lock collar 13, the protrusion 14p abuts on the side surface of the convex rib 13a, so that the rotation of the plastic cap 14 can be prevented.
[0029]
　More preferably, as often shown in FIG. 5, when the tightening rotation (direction of arrow R in FIG. 5) by screwing the plastic cap 14 to the lock collar 13 is completed, the plastic cap 14 is viewed from the rotation direction. By designing so as to abut on the side wall of the convex rib 13a located on the wake side, it is possible to prevent the plastic cap 14 from rotating from the tightening end stage by screwing the plastic cap 14 to the lock collar 13. It will be possible. Even if the plastic cap 14 does not necessarily abut on the side wall of the convex rib 13a and is located in the vicinity, almost the same effect can be obtained.
[0030]
　In the above embodiment, the convex ribs 14a are arranged at eight places on the outer surface of the plastic cap 14 at equal intervals, and the protrusions 14p are provided at two places in total at positions facing 180 degrees. The configuration is not limited, and the protrusions 14p may be provided at one or more locations.
[0031]
　The above-described embodiment disclosed this time is an example in all respects and is not a basis for a limited interpretation. Therefore, the technical scope of the present invention is not construed solely by the embodiments described above, but is defined based on the description of the claims. It also includes all changes within the meaning and scope of the claims.
Code description
[0032]
　1 Prefilled Syringe, 11 Syringe, 12 Piston, 10 Syringe Cap Assembly, 13 Lock Collar, 13a Convex Rib, 13b Recess Groove, 13n Spiral Thread, 14 Plastic Cap, 14a Convex Rib, 14b Recess Groove, 14c Circular Ribs, 14h inner peripheral surface, 14n threads, 14p protrusions, 14y bottom tubular, 14z bottom, 15 rubber caps, 15y recesses.

WE CLAIMS

A syringe cap assembly
　attached to the discharge port at the tip of the syringe, the lock collar attached to the discharge port at the tip of the syringe, and a
　plastic cap fastened to the lock collar by screwing
.
　A plurality of ridge ribs extending in the axial direction are provided on the outer surface of the lock collar along the circumferential direction, so that a plurality of concave grooves extending in the axial direction are provided between the ridge ribs adjacent to each other in the circumferential direction. There are defined,
　the bottom portion of the outer surface of the plug cap, the lock comprises a collar side projection extending toward the,
　in the step of rotating the clamping by screwing the locking collar has been completed of the plug cap, the projections, Cap assembly for syringe located in the recess groove between the ridge ribs.
[Claim 2]
　By arranging a plurality of the convex ribs on the outer surface of the lock collar at equal intervals, a plurality of recess grooves are also defined on the outer surface of the lock collar at equal intervals, and the
　protrusions are formed on the plastic cap. The syringe according to claim 1, which is located in the vicinity of the ridge rib located on the wake side when viewed from the rotation direction of the plastic cap at the stage where the tightening rotation by screwing to the lock collar is completed. Cap assembly for.
[Claim 3]
　The syringe cap assembly according to claim 2, wherein the ridge ribs are arranged at eight positions on the outer surface of the lock collar at equal intervals.
[Claim 4]
　The syringe cap assembly according to any one of claims 1 to 3, wherein the protrusions are provided at a total of two positions facing each other by 180 degrees.