SYRINGE HAVING MEANS FOR RETRACTING, CANTING AND DESTROYING A NEEDLE CANNULA

摘要

2067169 9105578 PCTABS00005 A disposable, safety syringe (1) having a conventional single ended hypodermic needle cannula (18) bonded to a central core (26) of a needle carrying hub (12) at the distal end of a syringe cylinder (2). A locking and retracting probe (14) extends proximally into the syringe cylinder from the central core of the needle hub. A piston assembly (6) having an offset locking bore (10) is advanced distally through the cylinder to expulse fluid therefrom via the cannula and to receive the locking and retracting probe within the locking bore. A continued distal advancement of the piston assembly through the cylinder causes the central core to be broken away from the needle hub. Therefore, when the piston assembly is withdrawn proximally through the cylinder, the cannula that is bonded to said central core is correspondingly retracted within, canted and shielded by the cylinder to avoid an accidental needle stick and the spread of disease.