Secure guide device

A secured guiding device for positioning and guiding a bone anchoring screw (4) during a surgical procedure, characterized in that it comprises a guide pin (2) having a bifid free end (20) which is elastically deformable and consists of two blades (21, 22) having, on the one hand, a first so-called “closed” configuration obtained, for example, by a manual stress so as to position said blades (21, 22) in the prolongation of the longitudinal axis of said guide pin (2) (2) thus allowing the latter to be inserted into a guide tube (3) for its positioning on the surgical site and, on the other hand, a second so-called “open” configuration in order to position said blades (21, 22) in two directions opposite and substantially perpendicular to that of the longitudinal axis of said guide pin (2) when the latter are outside the guide tube (3) in order to ensure a bone support when the anchoring screw (4) is being positioned.