A safety needle apparatus (20) having a needle (26) is provided that includes a first cylinder (22) extending from a proximal end (21) to a distal (23) end thereof and defining a longitudinal axis (x). The first cylinder further defines at least one longitudinal keyway (32) in a side wall thereof and at least one keyslot (36) disposed adjacent the distal end of the first cylinder. The keyslot is rotationally spaced apart from the at least one keyway relative to the longitudinal axis. A second cylinder (28) is mounted for relative movement with the first cylinder and defines at least one radially projecting key (32) adjacent a proximal end thereof. The key is configured for axial movement along the keyway such that the second cylinder is movable between an activated position, whereby the key is releasably engaged with a proximal end of the keyway to expose the needle (26), and a transport position, whereby the key is releasably disposed adjacent the distal end (23) of the first cylinder via an interference engagement with the raised surface (40) of the first cylinder to releasably enclose the needle within the second cylinder. The second cylinder is further movable from the transport position to a locked position, whereby the key is rotated relative to the first cylinder for fixed disposal within the keyslot to fixedly enclose the needle within the second cylinder.Linvention concerne un appareil de sûreté à aiguille, comportant une aiguille, un premier cylindre sétendant dune extrémité proximale à une extrémité distale de laiguille et définissant un axe longitudinal. Le premier cylindre définit, en outre, au moins une rainure de clavette longitudinale dans sa paroi latérale et au moins une fente de clavette pratiquée adjacente à lextrémité distale du premier cylindre. La fente de clavette est espacée de la rainure de clavette par rapport à laxe longitudinal. La rainure de clavette comprend une surface adjacente, à lextrémité distale du premier cylindre, qui lui est s
