The invention concerns a system for attaching a piece of osteosynthesis equipment against a bone tissue (16), the system comprising at least i) a screw (12) comprising a threaded barrel (13) and a back end (14a), and ii) a screwdriver (1) comprising a handle (3) extended by a rod (5) of which the front end includes an end-piece (7) capable of engaging with the back end (14a) of the screw. The screw is made from a material comprising a polymer. The screwdriver is provided with a guide member (4) for guiding the screw linked to the rod (5), a portion of the guide member (4) protruding in front of the end-piece (7) of the screwdriver and extending along or around a portion of the screw so as to guide said screw in axial translation, said guide member having a front end (4a) forming an abutment of the screwdriver against the surface of said piece of osteosynthesis equipment on completion of a predefined depth of screwing of the screw into the bone tissue. The guide member can be set at a chosen length of extension, corresponding to a depth of insertion of the screw, previously defined, for example, using a depth gauge. After insertion, the screw can be severed, and optionally fused with the piece of equipment it is attaching, in order to reinforce the locking of same.Linvention a pour objet un système de fixation dun matériel dostéosynthèse contre un tissu osseux (16), le système comprenant au moins i) une vis (12) comportant un fût fileté (13) et une extrémité arrière (14a), et ii) un tournevis (1) comportant un manche (3) prolongé par une tige (5) dont lextrémité avant porte un embout (7) apte à coopérer avec lextrémité arrière (14a) de la vis. La vis est en matériau comprenant un polymère. Le tournevis est équipé dun organe de guidage (4) de la vis relié à la tige (5), une portion de lorgane de guidage (4) faisant saillie en avant de lembout (7) du tournevis et sétendant le long ou autour dune partie de la vis pour la guider en translation axiale, ledit organe de gui
