Bone screw for the treatment of bone collapses or deformations, in the case of the Charcot foot, and insertion instrument of anti-migration elements into the bone screw

An improved bone screw for the treatment of bone collapses and deformations in the case of the so-called Charcot foot, comprising a non-threaded intermediate portion spaced between a tip portion and a head portion both of which being externally threaded;

• wherein the non-threaded intermediate portion is longer than the tip portion;
• wherein the non-threaded intermediate portion is longer than the head portion;
• said head portion having an outer diameter larger than said intermediate portion and said tip portion;
• said head portion having a head seat for coupling a tightening device;
• said bone screw further comprising at least one transverse hole on the non-threaded intermediate portion, said transverse hole having a circular cross-section at both its inlet and outlet and being arranged for inserting a corresponding at least one pin to prevent the migration of said bone screw when implanted into the bone;
• said bone screw further comprising a helical groove on the non-threaded intermediate portion;
• wherein said head portion is removably coupled to said intermediate portion;
• wherein said head portion is coupled to said intermediate portion by means of a shape coupling between two profiles, which allows only one relative coupling orientation or at least two relative coupling orientations rotated by a specific angular distance with respect to each other;
• wherein said head portion is coupled to said intermediate portion by means of a shape coupling between two profiles comprising a radial groove and a radial relief adapted to be inserted within said radial groove.