Sumitomo Rubber Industries Limited

Yoshikazu Masuyama

Hiroaki Nakano

Katsushi Maeda

Yuki Sakashita

Takuro Akasaka

Hisao Yoshinaga

Nami Masao

A laminated gasket () to be used for a medical syringe is provided, which includes a main body () made of an elastic material, and a film () provided on a surface of the main body (). The gasket () has a circumferential surface portion () to be brought into contact with an inner peripheral surface () of a syringe barrel () of the syringe. The gasket () further includes a projection () provided on a surface portion of the film () present in the circumferential surface portion () as extending circumferentially of the gasket. The projection () has a height of not less than 15 &#x3bc;m and not greater than 55 &#x3bc;m and a width of not less than 30 &#x3bc;m and not greater than 75 &#x3bc;m. With this arrangement, the laminated gasket is excellent in sealability.

Medical syringe, gasket to be used for syringe, and gasket production method

There is provided a rubber composition for additive manufacturing that allows rubber shaped articles to be favorably produced using an additive manufacturing apparatus. The rubber composition for additive manufacturing of the present invention comprises a liquid rubber.

Rubber composition for additive manufacturing

A gasket () is used for a medical syringe (), and includes a main body () made of an elastic material and an inert resin film () provided on a surface of the main body (). The gasket () has a cylindrical shape, and includes a plurality of annular ribs () provided on an outer circumferential surface () thereof and each having a sliding contact portion () to be kept in sliding contact with an inner peripheral surface of a syringe barrel. The plurality of annular ribs are axially arranged from a distal end to a rear end of the gasket (). The sliding contact portion () of a distal annular rib () has a width that is 1 to 25% of axial length of the cylindrical gasket.

Gasket, and medical syringe

The present invention aims to provide a medical rubber stopper that is excellent in chemical resistance and airtightness while having good productivity. The present invention relates to a medical rubber stopper including: a disk-shaped head portion with a flange region; and a cylindrical leg portion protruding from the lower surface of the head portion and having a smaller diameter than the head portion, the lower surface of the flange region and the leg portion being laminated with an inert film, the lower surface of the flange region and/or the outer periphery of the leg portion being provided with an annular groove through which the base rubber is exposed.

Medical rubber stopper and method for producing medical rubber stopper

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 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.

Growing community of inventors

Kobe, Japan

Yoshikazu Masuyama