The present invention relates to a bone fixation device (1) for securing attachment between a screw and a vertebra comprising two pedicles, comprising a hollow cavity having a longitudinal axis, a distal part (2) having itself a distal end and (7) a proximal end (8), and a proximal part (3) having itself a distal end (9) and a proximal end (10)；- said proximal part (3) comprises a flange at the proximal end (10)；- said distal part (2) comprises at least three helical slots (6)；- said distal part (2) comprises a full portion (5) located distally after said at least three helical slots (6)；- said flange being designed to provide a stop for the device (1), thereby resting on the outer surface of the vertebra, on the external side of the vertebral pedicle； and- said full portion (5) being designed so that upon insertion of a screw, the thread of said screw may bites inside the thickness of the full portion (5), causing the deformation of the deformable area (2D) of the distal part (2), wherein the distal end of the distal part (7) retracts towards the proximal end of the distal part (8).
