Abstract: A disposable syringe having a double hook element (9), causing, after a piston stroke toward the end of the socket element (4) of the needle, allowing retraction within the reservoir (1) during the reverse stroke of the piston (2). A spring (8) between the double hook element (9) and the end of a reservoir lip, when compressed, maintains the double hook element (9) in its position, and when extended, acts to cause the return of the needle (5) within the reservoir (1).

Abstract: Disposable syringe (100) characterized in that it is provided a needle carrier socket element (4), coupable with a lip of a reservoir (1) from inside the same reservoir, in that a seal (46) is realized on said lip for seating a sealing gasket (7) between needle carrier socket (4) and reservoir lip, in that it is provided a double hook element (9), causing, after the piston stroke toward the end of said socket element (4) of the needle (5), to allow its retraction within the reservoir (1) during the reverse stroke of the piston (2) and in that an elastic element or spring (8) is provided between said double hook element (9) and the end of said reservoir lip, that, when compressed, maintains said double hook element (9) in its position, and when extended acts to cause the return of the needle (5) within the reservoir (1).