Syringe having two component barrel

摘要

A syringe assembly includes a hollow cylindrically shaped barrel. The external side of the barrel has a first portion at its proximal end, a second portion adjacent the first portion and a third portion adjacent the second portion. The diameter of the second portion is less than the diameter of the first portion resulting in formation of a shoulder at the intersection of the first and second portions. The third portion outside diameter adjacent the second portion is substantially equal to the outside diameter of the second portion and increases to the outside diameter of the barrel. The assembly further includes a finger flange with a first side and a second side and an opening with an inside wall. The flange opening has an annulus positioned within it which has an opening. The annulus has an end attached to the inside wall of the flange opening and an unattached end projecting toward the first side of the flange, and forms an acute angle with the inside wall of the flange opening. The flange is held by the barrel so that the opening of the annulus rests at the second portion and the unattached end of the annulus is positioned adjacent to the shoulder so that a distal force for installing the flange is less than a proximal force for removal of the flange.