JP4905763B2 - Syringe damage prevention cap - Google Patents

Description

  The present invention relates to a cap that can prevent a syringe barrel (syringe) from being damaged, and more particularly, to a syringe damage preventing cap that prevents a barrel from being damaged in a drug solution storage syringe provided with a plunger.

  A so-called prefilled syringe that is pre-filled with a chemical solution is known. This prefilled syringe includes a barrel (injection cylinder), a gasket to be inserted into the barrel, and a plunger (presser) connected to the gasket, and a cap is attached to a mounting nozzle such as an injection needle at the tip of the barrel. It is a syringe that is attached and contains a chemical solution or the like in a space surrounded by a barrel and a gasket, and has been widely used in recent years because it eliminates the work of sucking the chemical solution and does not mix up the drug.

  In general, the prefilled syringe is manufactured by filling a barrel with a chemical solution, then plugging the gasket, and then connecting the plunger rod to the plugged gasket to integrate them. A plunger is assembled by screw fitting as a post-process on the stoppered syringe (for example, Patent Document 1).

  Prefilled syringes assembled in this way are distributed in tray packaging (blister packaging) one by one in order to mitigate impact from dropping or impact from collision with adjacent syringes. Occurrence such as dropping of the syringe due to handling after being taken out from the container frequently occurred. The dropped prefilled syringe has a large impact due to the drop due to the weight of the chemical filling in the barrel, and cracks and breakage occur especially at the barrel body tip, that is, at the barrel shoulder. It was easy to do.

  The occurrence of cracks and breakage due to dropping or the like is caused by inflexible materials such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, poly- (4-methylpentene-1), polycarbonate, acrylic resin, acrylonitrile. It is likely to occur when a polyester such as butadiene-styrene copolymer, polyethylene terephthalate, a hard resin material such as butadiene-styrene copolymer, polyamide resin, or glass is used.

  In order to suppress the occurrence of cracks and breakage due to impact at the time of dropping, the barrel thickness is increased, or the barrel body tip is partially thickened, The cost increases, and there are problems in terms of molding cycle (productivity) and molding accuracy, which is not preferable. Prefilled syringes are disposable type (disposable) syringes, and the appropriate wall thickness of the barrel is about 1 to 2 mm. Yes.

In addition, recently, as a mounting nozzle for injection needles etc. provided at the tip of the barrel, connection with injection needles, infusion routes, etc. using a luer lock method that prevents disconnection of the connection route and secures a more complete connection has been achieved. It has become widespread, and damage to the fitting portion of the luer lock system due to a drop impact has been regarded as a problem. In other words, the breakage of the fitting portion by the luer lock method may make the connection with the injection needle, the infusion route, etc. insufficient, and from the viewpoint of medical safety, such a damaged prefilled syringe is It must be discarded.
Japanese Patent Laid-Open No. 9-30689

  Therefore, it has been desired to develop a technique that does not cause damage or cracking of the barrel itself due to an impact such as dropping in the prefilled syringe, or damage to a mounting nozzle such as an injection needle provided at the tip of the barrel.

  In view of the above-mentioned present situation, the present invention is a barrel breakage, crack, or injection provided at the tip of the barrel generated from an impact such as a drop in a prefilled syringe without impairing productivity and maintaining molding accuracy. It is an object to provide a syringe breakage prevention cap that does not cause breakage of a mounting nozzle such as a needle.

  In order to solve such problems, the present inventor has intensively studied. As a result, the mounting nozzle such as an injection needle provided at the tip of the barrel is fitted and mounted with a cap for protecting it from impact damage. In order to complete the present invention, it is confirmed that if a drop impact on the shoulder of the barrel tip, which is easily damaged when the syringe is dropped by the cap, is avoided, damage to the barrel, cracking, or damage to the mounting nozzle on the barrel tip does not occur. It came.

Therefore, the present invention has the following configuration as its basic aspect. That is, in the drug solution storage syringe provided with the plunger,
(1) A cap that is fitted and attached to a mounting nozzle such as an injection needle provided at the tip of the barrel, the cap being made of an elastic material, and the diameter of the tip of the barrel around the outside of the cap A syringe breakage prevention cap, characterized in that an outer peripheral portion having a larger diameter is provided;
(2) A syringe breakage prevention cap in which the flat circumferential portion is provided around the outer end of the cap;
(3) A syringe breakage prevention cap, wherein the injection needle mounting nozzle provided at the barrel tip is of a luer lock type or a luer slip (luer taper) type;
(4) A syringe breakage prevention cap in which the elastic material of the cap is made of a rubber material selected from natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicon rubber;
(5) A syringe breakage prevention cap in which the elastic material of the cap is selected from a polyurethane, polyester, polyamide, olefin, or styrene thermoplastic elastomer;
It is.

The syringe breakage prevention cap proposed by the present invention is configured such that a cap made of an elastic member is fitted to and mounted on a mounting nozzle such as an injection needle provided at the tip of the barrel to protect against impact damage. By providing an outer peripheral portion that has a diameter (diameter) larger than the diameter of the tip of the barrel, avoiding a drop impact on the barrel tip shoulder that is easily damaged when the syringe is dropped, damage to the barrel, cracking, or Damage to the mounting nozzle at the barrel tip can be prevented.
A conventional cap for a syringe simply covers only the mounting nozzle at the tip of the barrel, and the mounting nozzle is likely to be damaged during a drop impact. In this case, there is an advantage that it is possible to avoid covering the mounting nozzle at the tip of the barrel.

Moreover, since the syringe breakage prevention cap of the present invention can avoid the occurrence of breakage and cracking of the syringe by simple means, it is possible to produce the conventional prefilled syringe as it is without hindering the productivity of the syringe. have.
Further, the manufactured prefilled syringe is not subjected to tray packaging (blister packaging) one by one, and the packaging form is inexpensive and it is possible to apply pillow packaging with good productivity.

  Furthermore, by fitting and attaching the syringe damage prevention cap of the present invention to an attachment nozzle such as an injection needle provided at the tip of the barrel, damage to the barrel, cracking, or damage to the attachment nozzle at the tip of the barrel is prevented. Since it can be avoided, the selection range of the material of the barrel is widened, the barrel thickness can be set to an appropriate range, and there is an advantage that a syringe having a simple shape can be produced.

Details of the present invention will be described below with reference to the drawings.
FIG. 1 is a partially longitudinal schematic view showing a basic configuration of a prefilled syringe fitted and fitted with a syringe breakage prevention cap according to an embodiment provided by the present invention.

That is, the syringe breakage prevention cap 10 of the present invention is fitted and attached to a mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 of the prefilled syringe 100, and the cap 10 The outer peripheral portion 11 having a diameter larger than the diameter of the tip portion of the barrel is provided.
The prefilled syringe 100 includes a barrel 20, a gasket 40 inserted into the barrel, and a plunger rod 50 connected to the gasket, and a desired space portion 60 surrounded by the barrel 20 and the gasket 40. It is a syringe that stores a chemical solution or the like.

FIG. 2 is an enlarged cross-sectional view of the main part of the syringe breakage prevention cap 10 according to the above-described embodiment of the present invention fitted and mounted on a mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 of the prefilled syringe 100. Indicates.
That is, the syringe breakage prevention cap 10 of the present invention is made of an elastic member and is fitted and fitted to a mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 of the prefilled syringe 100. Is provided with an outer peripheral portion 11 having a diameter larger than that of the tip of the barrel.
In the present embodiment, the cap 10 adopts a circular cylindrical shape, but the shape is not limited to a circular shape, and an injection needle or the like provided at the tip of the barrel 20 is mounted. As long as the nozzle 30 is fitted and mounted, it may have a polygonal shape.

  In this case, the mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 is a lumen portion 31 that leads out a drug solution or the like filled in the space 60 surrounded by the barrel 20 and the gasket 40 (not shown). The injection needle, the infusion route, etc. are connected. In this embodiment, the mounting nozzle 30 employs a luer lock system 32 that prevents disconnection of the injection needle and the like and ensures a more complete connection. However, a luer slip (luer taper) system is employed. It doesn't matter.

  The syringe breakage prevention cap 10 provided by the present invention is a cap made of an elastic member fitted and mounted on the mounting nozzle 30 and is larger than the diameter (B) of the barrel tip at the outer periphery 12 of the cap. Although the outer peripheral part 11 which becomes a diameter (A) is provided, in the present Example, this outer peripheral part 11 is comprised as a flat peripheral part. The difference (C) between the diameter (A) of the outer periphery and the diameter (B) of the barrel tip is sufficiently different so that the barrel tip shoulder 21 does not directly contact the drop surface when the syringe is dropped. It is sufficient that there is at least 1 mm or more. The difference (C) can be variously changed depending on the size and type of the syringe. In the case of a relatively large prefilled syringe, it is preferable to provide a larger difference.

  By having such a difference in diameter (C), even if the prefilled syringe receives an impact such as a drop, the presence of the difference causes a direct impact due to the drop to the barrel tip shoulder 21 which is likely to crack and break. There is no hanging. That is, since the barrel tip shoulder portion 21 has a difference in diameter (C), direct contact with the falling surface due to dropping is prevented. Therefore, in other words, the outer peripheral portion 11 serves as a flange for the cap 10 of the present invention, and prevents the barrel tip shoulder portion 21 from being damaged and cracking from a drop impact.

  In the present embodiment, the outer peripheral portion 11 is provided at the end portion of the outer periphery 12 of the cap 10, but it is not necessarily provided at the end portion of the cap. Good. Preferably, it is good to hang from the central part to the end part. Further, the thickness of the outer peripheral portion 11 is not limited in general, and various deformations are possible as long as the barrel tip shoulder portion 21 has a thickness sufficient to prevent the occurrence of cracks and breakage. The cap 10 and the outer peripheral portion 11 may have an integrated thickness (the same thickness).

  In this embodiment, the cap 10 is configured as a cap that completely covers the mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20, but the tip 33 of the nozzle 30 is hidden by the cap, As long as it has a protected configuration, it does not necessarily have to be configured as a cap that completely covers the mounting nozzle 30. The surface of the cap and the surface of the tip portion 33 of the nozzle 30 may form the same surface, or the surface of the tip portion 33 of the nozzle 30 may be configured as a slightly buried void.

  The syringe breakage prevention cap 10 of the present invention has a function of preventing breakage of the mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 due to a drop impact, and achieves such an object. I just need it.

  FIG. 3 is an enlarged cross-sectional view of a main part of the syringe breakage prevention cap 10 according to another embodiment of the present invention fitted and attached to a mounting nozzle 30 such as an injection needle provided at the tip of the barrel 20 of the prefilled syringe 100. Indicates. In addition, the code | symbol in a figure has the same meaning as the code | symbol of FIG.

  In the present embodiment, a configuration is adopted in which the front end shoulder portion 21 of the barrel 20 is covered with an outer peripheral portion 11 provided on the outer periphery 12 of the cap 10 and having a diameter larger than the diameter of the front end portion of the barrel 20. is doing. The length of the covering portion 11a covering the barrel tip shoulder portion 21 in the outer peripheral portion 11 only needs to be long enough to prevent the shoulder portion 21 from being damaged or cracked due to a barrel drop impact. Various changes can be made depending on the size of the syringe.

In the present embodiment, the shape of the cap 10 has a trapezoidal columnar shape as a whole, but is not limited to this shape. For example, the outer peripheral portion 11 of the cap 10 shown in FIG. In the same manner as the cap 10 shown in FIG. 3, a configuration may be adopted in which the tip shoulder portion 21 of the barrel 20 is covered for protection.
Further, the shape is not limited to the trapezoidal columnar shape, and may be a polygonal shape.

  Accordingly, the syringe breakage prevention cap 10 provided by the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of achieving the object, and such modifications are also within the technical scope of the present invention. Is included.

  As a material for forming the syringe breakage prevention cap 10 in the present invention, an elastic material is used for mitigating the drop impact. Examples of the elastic material of the cap 10 include rubber materials selected from natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicon rubber, or polyurethane, polyester, polyamide, olefin, or styrene. Mention may be made of thermoplastic elastomers. Among these, it is particularly preferable to use a rubber material.

  The material for forming the syringe breakage prevention cap 10 according to the present invention is not limited to the elastic material described above. For example, the portion covering the mounting nozzle provided at the barrel tip is made of the elastic material described above. The other part may be made of hard rubber or plastic material.

As an example of such changes, an example of the syringe breakage prevention cap 10 shown in FIGS. 2 and 3 is shown in FIGS. In addition, the code | symbol in each figure has the same meaning as the code | symbol of FIG.2 and FIG.3.
That is, FIG. 4 is a modification of the configuration of the forming material of the cap 10 shown in FIG. 2, but the portion 10a covering the mounting nozzle 30 provided at the barrel tip is configured with the elastic material described above. The other outer peripheral portion 11b may be made of hard rubber or plastic material.
FIG. 5 is a modification of the configuration of the forming material of the cap 10 in FIG. 3, but the portion 10a covering the mounting nozzle 30 provided at the tip of the barrel is made of the elastic material described above, and the other The part 11b including the outer peripheral part may be made of hard rubber or plastic material.

  The syringe breakage prevention cap of the present invention thus configured is a cap made of an elastic member that is fitted to and attached to a mounting nozzle such as an injection needle provided at the tip of the barrel, and protects against impact damage. The cap is provided with a flat circumferential portion having a diameter larger than the diameter of the tip of the barrel.

  Therefore, it is possible to avoid a drop impact on the barrel tip shoulder which is easily damaged when the syringe is dropped, and to avoid occurrence of damage to the barrel, crack, or damage to the mounting nozzle provided at the barrel tip. The value of is tremendous.

It is the fragmentary longitudinal cross-section schematic which shows the basic composition of the prefilled syringe which fitted and equipped with the syringe breakage prevention cap based on one Example of this invention. It is a principal part expanded cross section of the front-end | tip part of the prefilled syringe which fitted and mounted | worn with the syringe damage prevention cap based on the said Example of this invention. It is a principal part expanded cross section of the front-end | tip part of the prefilled syringe which fitted and mounted | worn with the syringe breakage prevention cap based on another Example of this invention. It is a principal part expanded cross section of the front-end | tip part of the prefilled syringe which fitted and mounted | worn with the syringe breakage prevention cap based on another Example of this invention. It is a principal part expanded cross section of the front-end | tip part of the prefilled syringe which fitted and mounted | worn with the syringe breakage prevention cap based on another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Syringe damage prevention cap 11 Circumferential part 11a Cover part 12 Cap outer peripheral surface 20 Barrel 21 Barrel tip shoulder part 30 Attached nozzle 31 Lumen part 32 Luer lock 40 Gasket 50 Plunger 60 Space part 100 Prefilled syringe

Claims (4)

In the drug solution storage syringe with the plunger,
A cap fitted to and mounted on a mounting nozzle of a luer lock type or a luer slip (luer taper) type, such as an injection needle provided at the tip of a barrel, the cap being made of an elastic material, and the cap A syringe damage prevention cap, characterized in that a flat circular outer peripheral portion having a diameter larger than the diameter of the tip portion of the barrel is provided on the outer periphery of the syringe. The syringe breakage prevention cap according to claim 1, wherein the flat circular outer peripheral portion is provided around the outer periphery of the end portion of the cap. The syringe breakage prevention cap according to claim 1, wherein the elastic material of the cap is made of a rubber material selected from natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicon rubber. The syringe breakage prevention cap according to claim 1, wherein the elastic material of the cap is selected from a polyurethane-based, polyester-based, polyamide-based, olefin-based or styrene-based thermoplastic elastomer.

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