Patent ID: 8092454
Filing Date: 2012-01-10
Classification: A61B

Abstract:
1. A fixation instrument for treating a bone fracture comprising: a nail member, said nail member having a longitudinal axis, a distal end and a proximal end, said proximal end having an aperture extending therethrough and said nail member having a chamber located in said proximal end; an insert having a longitudinal axis, said insert positioned and constrained against rotation about said longitudinal axis of said insert within said chamber; a bone screw, having a threaded portion, said bone screw extending through said aperture; a locking ring received in said chamber and engaging said insert, said locking ring operative to secure said insert within said chamber; and said insert having a distal end and a proximal end, a concave lower surface located at said distal end of said insert, said concave lower surface being that portion of the insert spaced farthest from the proximal end and engaging a convex surface of said bone screw, said convex surface complementary to said concave lower surface of said insert, when said bone screw extends through said aperture.