SAFETY SYRINGE WITH RETRACTABLE NEEDLE

摘要

An improved safety syringe (10) with retractable needle (30) is provided whi ch allows retraction of the needle (30) into a hollow plunger (18) by additional forward pressure on the plunger (18) after the fluid is driven from the syringe (10). The present invention contemplates an improved syringe device with retractable needle (3 0) and a method of delivering fluid to a patient and retracting the needle (30) within the syringe (10) after the fluid is delivered. The syringe (10) preferably includes a hollow plunger (18) inserted into one end (16) of a cylindrical barrel (12) and a hollow needle (30) attached to the other end (14) of the barrel (12). Biasing means is attached to the barrel (12) for biasing the needle (3 0) toward the hollow plunger (18), and means is pro- vided for releasing the needle (30) into the hollow plunger (18) by applying additional forward pressure upon the plunger (18) af- ter the plunger is fully extended into the barrel (12). The present inventio n is particularly convenient for the operator to use in a one-handed fashion and is relatively uncomplicated and easy to manufacture. Further, the present invention is non-reusable after the needle is retracted thereby preventing reuse of a potentially contaminat ed syringe.