Security syringe with retractable hollow needle.

A syringe having a device for clamping the selbstätigen needle and having means for retracting the needle into the syringe at the end of injection, the following members comprises: an outer cylinder (1) and an inner cylinder (7); Openings (2,3) at the ends of the cylinder (1); an opening (11) at one end of the cylinder (7); Closure means (12) for the opening (11); a needle with a head (14); Sealing means (34,35) in the closing means (12); Spring means (29) for impact of the needle (6) against the member (12); a by a spring (21) loaded device (17) for clamping a part of the needle (6) at the distal end of the syringe and to release the needle (6); one with the limb (12) assembled membrane (36), which bends before their rupture; Means (17,18) for preventing the entrance into the inside of the syringe; Stop means (45) to prevent extraction of said second cylinder (7) from the proximal end of the syringe (2).