Patent ID: 7427276

Claim:
A syringe comprising: an outer tube, a gasket slidable in said outer tube, a pusher inserted through an opening of a base end of said outer tube and operable for moving said gasket, a stopper provided on said pusher so that said stopper can be slid along the longitudinal direction of said pusher and the position of said stopper on said pusher can be regulated to a desired position, the stopper is provided with a pair of abutment surfaces, an operating member provided to be displaceable relative to said stopper, said operating member performing an operation of fixing said stopper relative to said pusher by pressing a portion of said stopper against said pusher, wherein the depth of insertion of said pusher into said outer tube is restricted by abutment of said stopper on a portion of said outer tube, wherein said pusher is provided with a pair of abutment surfaces substantially parallel to each other, wherein either one or both of the abutment surfaces of said stopper and said pusher are formed as rough surfaces or are formed of a material having a high frictional resistance, and wherein said stopper comprises a stopper main body, and a brake portion pressed against said pusher by operation of said operating member, and wherein said pressing of said brake portion against said pusher is performed by clamping said brake portion between a portion of said operating member and said pusher.