Implantable osteosynthesis device

Implantable osteosynthesis device comprising:

• a fixed part comprised of an elongated element;
• a movable part movable relative to the fixed part, and comprised of a body which forms a sleeve capable of sliding along the elongated element;
• and
• coupling means adapted to block translation of said parts so as to obtain a clamping effect on a bone, said coupling means comprised of one-way locking means coupled or incorporated respectively in one of the fixed or movable parts and arranged on the other part to allow the relative displacement of said parts in only one direction for providing the clamping effect and to lock in translation the fixed and movable parts in the other direction;
• said one-way locking means having a number of parallel notches arranged along the elongated element of the fixed part and a ratchet system incorporated in the body of the movable part, said ratchet system comprising an asymmetric tooth operatively arranged with elastic means and adapted to be accommodated in the notches of the elongated element, the notches and the tooth being structured and arranged so that when the tooth is accommodated in one of the notches there is a clearance between an outer surface of the tooth and an inner surface of the notch enabling the ratchet system and the body to tilt with respect to said elongated element and produce a wedge effect ensuring self-locking.