Patent ID: 7666169

Claim:
A syringe comprising: a body; and a plunger movably disposed within the body, the plunger comprising: a cylindrical wall extending in a longitudinal direction and having a circumferentially continuous inner surface and an outer surface, the inner surface defining a retaining shoulder formed in a radial direction and extending along the circumference of the cylindrical wall; and a plurality of inwardly projecting flanges extending rearwardly from the retaining shoulder and fixedly disposed on the circumferentially continuous inner surface of the cylindrical wall, wherein the plurality of inwardly projecting flanges extending a length in a longitudinal direction and are fixedly connected along the length to the cylindrical wall, wherein the inwardly projecting flanges are continuously supported in the longitudinal direction by the circumferentially continuous inner surface of the cylindrical wall, wherein the outer surface is defined by a wall that is planar in axial and annular directions.