Syringe having an alignment flange, an extending lip and a radial expansion section of reduced wall thickness

Abstract

A syringe includes a body having a distal end, a proximal end and a center section therebetween. The distal end of the syringe body includes a conical portion that extends and tapers from the center section to an injection neck forming a discharge outlet. The proximal end of the syringe body includes a radial expansion section and an outward extending lip. An inner diameter of the radial expansion section is larger than an inner diameter of the center section and the outer diameter of the radial expansion section is smaller than an outer diameter of the center section. A plunger is movably disposed in the syringe body and includes a pair of coupling members defining a slot therebetween, the plunger being substantially seated in the radial expansion section in a pre-use state of the syringe. An alignment flange is formed on the conical portion and extends the distance between the center section and the injection neck. The alignment flange defines an internal hollow area therein in fluid communication with the interior of the syringe body, which is adapted to collect air bubbles that are present within the interior of the syringe body.