The blunt end 1 of the needle or canulla is attached to the hollow attachable part 3 by the isolation bed 2, which has a neck 4 at its end to attach to syringe. The hollow attachable part 3 has the shape of a double tube with a blinded bottom 5, and this bottom 5 is equipped with a groove D in which the compression spring 6 is fixed, the outer tube 7 of the attachable part 3 is provided with at least two shoulders 8, the length of the inner tube 9 of the attachable part 3 does not exceed the outer tube 7 and it contains the inner tube 10 of cover 11 with an internal conical opening 12 for guiding the needle or cannula, wherein the cover 11 has a shape corresponding to the shape of the hollow attachable part 3. The cover 11 is upheld to the hollow attachable part 3 by at least one snap element 13 with a blocking element 18, then the inside of the cover 11 is provided with the groove d, wherein in this groove d the other end of the compression spring 6 is fixed, the front element 14 with the opening 15 is by means of snap elements 12 fixed on the outside of the cover 11, wherein the front element is provided with flexible element 16 on the internal shoulder 17 to cover the opening 15 after removing the needle or cannula from it. The blocking element 18 is controlled by a lever mechanism 19 situated at the outer side of the hollow attachable part 3.
