Patent ID: 6355069
Filing Date: 2002-03-12
Classification: A61F

Abstract:
A bone prosthesis comprising:an implantable elongate stem member of an artificial joint having a bore extending therethrough, the stem member having a proximal end including a joint motion surface adapted to receive a joint articulation member, and a distal end with at least one slot formed in the distal end, the at least one slot extending along at least a portion of the stem member in a longitudinal direction from the distal end towards the proximal end to form at least two tines at the distal end of the stem; a bolt member disposable within the bore of the stem member, the bolt member having a proximal end and a distal end, wherein at least a portion of the bolt member proximate the distal end is threaded; and an expander nut including a perimeter having at least one stepped-in portion formed therein that is adapted to seat a tine, the stepped-in portion being effective to prevent rotation of the expander nut with respect to the stem and to cause side edges of adjacent tines to be offset, the expander nut being disposed between the tines and threadably matable with the distal end of the bolt member such that rotation of the bolt member in a first direction is effective to draw the expander nut towards the proximal end of the stem member to separate the tines at the distal end of the stem member and to define a cavity between the tines.