DISPOSABLE SAFETY SYRINGE CAPABLE OF ACHIEVING PERFECT SEALING IN A COUPLING PORTION OF A SYRINGE NEEDLE PROTECTIVE CAP WITHOUT REQUIRING ADDITIONAL PARTS

摘要

PURPOSE: A disposable safety syringe is provided to achieve perfect sealing in a coupling portion of a syringe needle protective cap without requiring additional parts, and to enable appropriate bending of a syringe needle. CONSTITUTION: The disposable safety syringe comprises a cylinder(101) formed with an injection discharge portion(102) having an inner tapered portion, and a syringe needle fixing cap(105) having an outer tapered portion(105b), the inner and outer tapered portions come into airtight contact with each other. The fixing cap is adapted to be forcibly moved far away from the cylinder. The syringe further comprises a piston(104) formed with a flexible pressure protrusion(104a). In a state wherein the piston is moved forward by means of a pusher(103) and the end of the pusher is coupled to the fixing cap, the protrusion is constricted as it comes into close contact with the fixing cap, thereby eccentrically pressing the fixing cap forward.