Implant osseux expansible, système orthopédique et procédé de fabrication de l'implant

An expandable bone implant (1) for veterinary orthopaedic surgery for restoring the volume and/or geometry of a bone, by expansion between a folded configuration and a deployed configuration, said implant (1) extending along a longitudinal axis (L) between a proximal end (11) connectable with an implantation instrument (A) for holding the implant and a distal end (12) intended to be inserted first into the bone, at least two faces, for example an upper and a lower face, of the implant each comprising a flange (13, 14) for contact with bone tissue, each of the flanges comprising a central portion (130, 140) connected, by means of at least one hinge, to at least one pair of support arms (131, 141) each oriented in opposite directions within each pair, one arm of each pair being connected by a hinge to the distal end (11) while the other arm is connected by a hinge to the proximal end (12), the implant (1) being able to receive or comprising a central shaft (3) extending through a sliding sleeve at the proximal end (11) as far as a traction ring or socket at the distal end (12) where it is able to transmit traction, when actuated by an instrument (A), to the distal end (12) in order to allow it to move closer to the proximal end (11), causing the support arms (131, 141) to pivot, thus causing the flanges (13, 14) to move away from one another and, consequently, the expansion of the implant between the folded configuration and the deployed configuration, wherein the implant comprises a casing enclosing said implant from the proximal end (11) to the distal end (12) and in that:

• said casing is formed by a sheet (10) made of a biocompatible metal alloy and fluidtightly closed on itself;
• said sheet (10) has, at least in the folded configuration, a plurality of pairs of folds, each of the pairs comprising an antiform fold (101), referred to as convex, and a synform fold (102), referred to as concave, said folds lying one on top of another in the folded configuration such that the surfaces present between each of said convex and concave folds are rolled around the longitudinal axis (L);
• said proximal end (11) is extended by a fluidtight sleeve fluidtightly secured to the lying-down and rolled folds of said sheet (10) over the entire periphery of the proximal end (11);
• said distal end (12) is extended by a socket fluidtightly secured to the lying-down and rolled folds of said sheet (10) over the entire periphery of the distal end (12) of said implant (1);
• said sheet (10) is plastically deformable to allow the expansion of the implant from the folded configuration to the deployed configuration, forming a fluidtight casing enclosing the implant and configured to avoid any leakage when a fluid is being injected into the implant (1) and the casing.