Expandable bone implant for veterinary orthopaedic surgery, orthopaedic system and method for manufacturing the 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 comprising a central shaft (3) and 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 first inserted into the bone, at least two faces, for example, an upper and a lower face, of the implant each comprising at least one flange (13, 14, 15) for contact with bone tissue, each of the flanges being supported by at least two support arms (131, 141, 151) each, by means of a hinge on the central shaft (3) and a hinge under the respective flange (13, 14, 15) of each of said support arms (131, 141, 151);

• wherein:
• an expansion ring or socket (20) is arranged on the same axis as said central shaft (3);
• at least two expansion arms (132, 142, 152) each have a hinge connecting them to one of the ends of one of the flanges (13, 14, 15) and a hinge connecting them to said expansion ring or socket (20);
• said expansion ring or socket (20) and the proximal end of the central shaft (3) can be actuated in order to cause separation between said socket (20) and said central shaft (3), applying traction to the flanges (13, 14, 15), via the expansion arms (132, 142, 152), thereby causing said support arms (131, 141, 151) to pivot, thus causing the flanges (13, 14, 15) to move away from the central shaft (3) to result in controlled expansion of the implant (1) between said folded configuration and said deployed configuration;
• and 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, closed on itself in a sealed manner;
• 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 on top of each other in a folded configuration so 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 sealing sleeve secured in a sealed manner 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 secured, in a sealed manner, 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 expansion of the implant from the folded configuration to the deployed configuration, forming a sealed casing enclosing the implant and making it possible to avoid leakage when a fluid is injected into the implant (1) and the casing.