Fixation instrument for treating a bone fracture

  • US 8,092,454 B2
  • Filed: 03/11/2005
  • Issued: 01/10/2012
  • Est. Priority Date: 03/11/2004
  • Status: Active Grant
First Claim
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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.

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