#$%^&*AU2014203206B220160512.pdf#####H: scg lntenvovecn NRPorbl DCC SCG 6373140 l.DOC-29/05/2014 ABSTRACT A syringe assembly, comprising: a hollow barrel with a nozzle at a distal end of said barrel, said barrel defining at least one pair of apertures； a plunger slidably movable within said barrel, said cap and said barrel at least partially defining a fluid chamber therebetween, wherein said plunger has at least two flanges protruding laterally outward therefrom； a resilient cap attached to the distal end of said plunger and engaging an interior surface of said barrel； a hollow needle in fluid communication with said fluid chamber and retractably mounted with respect to said barrel； a spring retainer having a retainer body with at least one pair of projections each protruding laterally outward from said body into a respective one of said at least one pair of apertures thereby locking said spring retainer to said barrel, said spring retainer body defining a longitudinally elongated passage for receiving said plunger therethrough, said spring retainer and said plunger cooperatively defining a needle-retraction channel； a needle retraction mechanism passing through said needle-retraction channel and operatively supported by said spring retainer, said needle retraction mechanism including a needle holder attached at a distal end thereof to said needle, and a spring circumscribing a portion of said needle holder and biasing said needle holder from an advanced position, in which said needle projects out of said barrel nozzle, to a retracted position, in which said needle and said needle holder are fully enclosed within said barrel； wherein said spring retainer grips said needle holder thereby retaining said spring in a compressed state between said needle holder and said spring retainer, and releases said needle holder in response to said plunger sliding to a fully advanced position, whereby said spring is allowed to expand a
