The invention relates to a fastening device for implant device, the fastening device comprising at least two fastening sections, where a first fastening section is arranged with a through hole, a second fastening section is arranged with a protruding part, and where said protruding part is in place in said trough hole in a fastening device locking state, where the protruding part on the second fastening section is arranged with a trough channel having an inlet and an outlet, said through channel being arranged to receive an implant device feed member, said inlet and outlet being accessible from the exterior of the fastening device in said fastening device locking state, wherein the first fastening section is securely locked to the second fastening section when, in said fastening device locking state, said implant device feed member is in place in the trough channel and protrudes from both the inlet and the outlet of said trough channel. The invention further relates to an implant device comprising a fastening device, and a method for securely locking a first fastening section of a fastening device for an implant device to a second section of a fastening device for an implant device.La présente invention concerne un dispositif de fixation pour un dispositif dimplant, le dispositif de fixation comportant au moins deux sections de fixation, la première section de fixation étant munie dun trou débouchant, la seconde section de fixation étant munie dune partie en saillie, et la partie en saillie étant placée dans ledit trou débouchant lors du verrouillage du dispositif de fixation. La partie en saillie de la seconde section de fixation est munie dun passage traversant présentant un orifice dentrée et un orifice de sortie, ledit passage traversant étant agencé pour recevoir un organe dalimentation de dispositif dimplant, lesdits orifices dentrée et de sortie étant accessibles depuis lextérieur du dispositif de fixation lorsque le dispositif de fixation se trouve dans ledi
