Osseous anchoring implant with cortical stabilization

An osseous implant with cortical stabilization able to be implanted in a bone, comprising:

• an expandable sleeve extending between a proximal portion having a first internal diameter, and a distal portion having a second internal diameter smaller than said first internal diameter, these two portions defining a longitudinal axis and said first and second internal diameters defining an internal profile of said expandable sleeve, and comprising at least a first threading inside the expandable sleeve and at least a second threading outside the expandable sleeve,
• a screw body extending between a distal portion and a proximal portion having a head for fixing a plate on said bone, and having, along said longitudinal axis, an external profile complementary to the internal profile of said expandable sleeve and at least one external threading whose screw pitch is reversed relative to said second external threading of the expandable sleeve,
• wherein
• the implant is able to switch from a folded rest position to a deployed position by the actuation of said reversed threading by causing the penetration of the screw into the expandable sleeve and generating the expansion of said expandable sleeve by deformation, thanks to the fact that said second internal diameter of the expandable sleeve comprises at least one shrinkage having a size inferior to the external diameter of the screw, said shrinkage being located at a distance from the proximal end which is determined as a function of the desired expansion location relative to the cortical bone tissue,
• in the deployed position of the implant, the second internal diameter of the expandable sleeve being greater than or equal to the first internal diameter of the sleeve, and the external diameter of the expandable sleeve thereby being expanded, at the level of said shrinkage, to a diameter greater than the external diameter of the sleeve at the proximal portion.