Patent ID: 8066663

Claim:
A slide valve disposed in a syringe barrel, the slide valve comprising: an approximately cylindrical first elastic body having a first bottom surface and a second bottom surface opposite to the first bottom surface, and an approximately cylindrical second elastic body jointed to the first bottom surface of said first elastic body, the second bottom surface of said first elastic body and a side surface portion contiguous with said second bottom surface being laminated with a first, synthetic resin film and at least a side surface portion of said second elastic body being laminated with a separate second synthetic resin film, wherein a portion of the side surface portion of the first elastic body and a portion of the side surface portion of the second elastic body respectively proximate a jointing portion between the first and second elastic bodies, are lamination free and have diameters which are respectively less than diameters of the laminated portions of the side surface portions of the first elastic body and the second elastic body.