Hypodermic syringe

A hypodermic syringe comprising a barrel, a plunger slidably disposed in said barrel and extending from a proximal end of said barrel, a stopper mounted on a first end of said plunger, a needle mounting member disposed in said barrel, a post portion of said needle mounting member being adapted to extend through an opening in a distal end of said barrel, a needle mounted on said post portion, a coil spring fixed at one end to an internal portion of said barrel proximate a distal end wall thereof and fixed at a second end to said needle mounting member to bias said needle mounting member toward said proximal end of said barrel, and leaf spring means extending inwardly of said barrel from wall portions of said barrel and adapted to engage said needle mounting member to hold said needle mounting member adjacent said distal end of said barrel against said bias of said coil spring, said stopper being adapted to engage said leaf spring means to move said leaf spring means outwardly to disengage from said needle mounting member, to permit said needle mounting member and said needle to move in said barrel in response to said coil spring bias toward said proximal end of said barrel to move said needle from outside said barrel to inside said barrel.