VIAL RUBBER-STOPPER

• US 20100206836A1
• Filed: 10/20/2008
• Published: 08/19/2010
• Est. Priority Date: 10/18/2007
• Status: Abandoned Application

• Current Assignee: Daikyo Seiko, Ltd.
• Original Assignee: Daikyo Seiko, Ltd.
• Inventors: Koshidaka, Tsuyoshi, Sudo, Masamichi
• Application Number:
  US12/734,186
• Publication Number:
  US 20100206836A1
• Time in Patent Office: Days
• US Class Current: 215/355
• CPC Class Codes: A61J 1/1468 Containers characterised by specific material properties
• CPC Class Codes: B65D 2539/003 provided with sealing flanges or ribs
• CPC Class Codes: B65D 2539/008 with coatings or coverings
• CPC Class Codes: B65D 39/0023 Plastic cap-shaped hollow plugs

Abstract

There is provided a rubber stopper used to seal an opened portion of vials and syringes for keeping medical liquid and, in particular, to a rubber stopper in which stoppering properties can be improved without damaging sealing properties in the absence of silicone coating.

A vial rubber stopper 1 comprises a disc-like top portion 3 and a cylindrical leg portion 2 of smaller diameter compared with that of the disc-like top portion, which is protruded from a bottom surface of the disc-like top portion 3 to shape into a flange 2A upward. An under-flange ring portion 3A connected to a flange bottom surface 2B is divided on an outer peripheral surface of the cylindrical leg portion 2, and the first ring-like raised portion 3B and the second ring-like raised portion 3C are formed downward of the under-flange ring portion 3A in the circumferential direction. An upper surface of the disc-like top portion 3 including a flange-upper surface, a maximum diametral portion of a flange-peripheral surface, a bottom surface of the disc-like top portion 3 located inside of the cylindrical leg portion 2 and a surface of the cylindrical leg portion 2 other than the under-flange ring portion 3A are laminated with a synthetic resin to leave the flange bottom surface and the surface of the under-flange ring portion 3A as a naked rubber stock.

Claims

1. A vial rubber stopper comprises a disc-like top portion and a cylindrical leg portion of smaller diameter compared with that of the disc-like top portion, which is protruded from a bottom surface of the disc-like top portion to shape into a flange upward, characterized in that an under-flange ring portion connected to a flange bottom surface is divided on an outer peripheral surface of the cylindrical leg portion, and at least one ring-like raised portion is arranged downward of the under-flange ring portion in the circumferential direction, while an upper surface of the disc-like top portion including a flange-upper surface, a maximum diametral portion of a flange-peripheral surface, a bottom surface of the disc-like top portion located inside of the cylindrical leg portion and a surface of the cylindrical leg portion other than the under-flange ring portion are laminated with a synthetic resin to leave the flange bottom surface and the surface of the under-flange ring portion as a naked rubber stock.

2. A vial rubber stopper claimed in claim 1 in which shortest interval from a bottom surface of said flange to a ring-like raised portion nearest thereto is fallen in a range from ⅓

to 5 times of the ring-like raised portion.

3. A vial rubber stopper claimed in claim 1 in which maximum diameter of a ring-like raised portion nearest to a bottom surface of said flange is 1 to 30% larger than a caliber of an opened portion of a vial to be inserted thereto said cylindrical leg portion.

4. A vial rubber stopper claimed in claim 1 in which said under-flange ring portion is divided between a bottom surface of said flange and an upper edge portion of a synthetic resin film to be laminated on an outer peripheral surface of said cylindrical leg portion.

5. A vial rubber stopper claimed in claim 1 in which a material of said synthetic resin film is either a fluororesin or Ultra High Molecular Weight polyethylene.

6. A vial rubber stopper claimed in claim 1 in which press molding of said cylindrical leg portion and lamination of a synthetic resin film onto said cylindrical leg portion are conducted at the same time, while press molding of said disc-like top portion, lamination of a synthetic resin film onto said disc-like top portion and unification of said disc-like top portion and said cylindrical leg portion are conducted at the same time.