Retractable syringe applicator

Claim 1

A combination retractable injector and injector enclosure comprising: a hypodermic syringe including a cylindrical syringe body supporting an axially mounted canula at one end, the other end being open, and including a plunger slidably engaged within the body, the plunger having a sealing means, outwardly biased first locking means, first disengaging means, and a grasping and manipulation means, the LATTER extending from the open other end of the syringe body; and an open ended tubular inner case providing, an internal annular lip adapted for passing the syringe body therethrough, and for engaging the first locking means, the inner case further providing a coil spring coaxially engaged within the inner case between the annular lip and the grasping and manipulation means of the plunger, such that with the first locking means engaged with the annular lip the spring is held in compression; the injector enclosure being of tubular construction and including an inwardly biased second locking means, the enclosure operably engaging the combination of the syringe and inner case within the enclosure, the canula and inner case extending from opposite ends of the injector enclosure respectively, the second locking means engaging the other end of the syringe body for locking the later in place at a forward position within the injector enclosure, so that as the inner case is drawn out of the enclosure, the plunger is drawn through the syringe body to fill the body with an injection liquid, the injector enclosure further including second disengaging means for forcing the first engagement means to disengage the annular lip of the inner case; whereby with the canula positioned for injecting, the inner case is forced into the injector enclosure thereby driving the plunger into the body of the hypodermic syringe for injecting the injection liquid, until the first and second disengaging means are brought simultaneously into contact with the second and first locking means respectively, thereby disengaging the syringe body from the forward position within the injector enclosure, and the plunger from the annular lip of the inner case thereby allowing the spring to drive the hypodermic syringe fully into the injector enclosure to conceal the canula.