Sumitomo Rubber Industries Limited

Katsushi Maeda

Eiji Yao

Yoshikazu Masuyama

Shinya Iwano

Hiroaki Nakano

Junji Tashiro

Masahiro Kakutani

Norikazu Miyamoto

Tomohito Shirai

A medical rubber closure according to the present invention includes a disc-shaped flange portion and a leg portion formed to be continuous to a lower surface side of the flange portion, and a region at the lower surface side of the flange portion and the leg portion are made of a nitrile based rubber, a region at a top surface side of the flange portion is made of a butyl based rubber, and the leg portion is laminated with a coating layer made of a fluorine based resin film.

Method for manufacturing a medical rubber closure

The present invention aims to provide a pre-filled syringe coated with a resin film capable of reducing sliding resistance and preventing liquid leakage by a simple method. The present invention relates to a gasket for a pre-filled syringe, which has a sliding side surface that is coated with an inactive resin film and further cut to form a cut. The cut region is preferably between ring-shaped ribs on the sliding side surface, or in a ring-shaped rib on the sliding side surface.

Gasket for pre-filled syringe

The present invention provides, medical rubber parts that do not physically and chemically affect the quality of preparations. The present invention relates to a medical rubber part obtained by press-molding an unvulcanized rubber mainly containing a rubber for forming a liquid-contacting portion and an unvulcanized rubber mainly containing a butyl-based rubber for forming a non-liquid-contacting portion, wherein a color difference dE between the liquid-contacting portion and the non-liquid-contacting portion is 6.0 or more in NBS units.

Medical rubber parts

A pre-filled syringe with excellent air-tightness and liquid-tightness and a mold for forming the gasket are provided. At least a surface of the mold for a gasket laminated with an inactive film for a pre-filled syringe forms a seal sliding surface of an annular protrusion of the gasket is mirror finished to have an arithmetic mean roughness Ra of less than 0.03 &#x3bc;m.

Mold for gasket for prefilled syringe

Disclosed is a closure device for a container, which seals an opening () that opens at the top of a container () and has a rim () on its periphery. The closure device comprises a seal member () that is to cover the opening () on the top of the container (), and a synthetic resin cap () that is to press the seal member () against the upper surface of the rim (). The seal member () comprises a flange () to be mounted on the upper surface of the rim (). The cap () comprises a top wall (), a cylinder part (), and a locking part (). The top wall () is to be disposed above the flange (). The cylinder part () hangs down from the outer circumference of the top wall (). The locking part () is disposed on the inner surface of the cylinder part (). After the cap () is pushed down, the locking part () locks at the under surface of the rim (). The upper surface of the flange () has a compressible projection (). The compressible projection () is annularly arranged in contact with and along the outer circumference of the flange () in a planar view.

Closure device for a container, and seal member for the device

The present invention provides a gasket for glass or resin syringes which is laminated with an inert resin film and is excellent in plugging properties, liquid-tightness, and slidability. The gasket laminated with an inert resin film has multiple circular ribs that are to be in sliding contact with an inner wall of a syringe barrel, wherein the circular ribs include a front circular rib having a sliding contact portion whose cross section has a diameter that expands substantially linearly toward a back end of the syringe barrel, the linear portion has a length of 10 to 55% of the length of a sliding side face of the gasket, and the diameter of the linear portion which expands substantially linearly toward a back end of the syringe barrel has a diameter expansion ratio X between a minimum diameter r (mm) and a maximum diameter R (mm) of 0.1 to 8.0%.

Growing community of inventors

Kobe, Japan

Katsushi Maeda