US 6,981,991 B2 | ||
Arthroplasty devices configured to reduce shear stress | ||
Bret A. Ferree, 1238 Cliff Laine Dr., Cincinnati, Ohio 45208 (US) | ||
Filed on Jun. 27, 2003, as Appl. No. 10/608,616. | ||
Claims priority of provisional application 60/392234, filed on Jun. 27, 2002. | ||
Prior Publication US 2004/0019386 A1, Jan. 29, 2004 | ||
Int. Cl. A61F 2/36 (2006.01) |
U.S. Cl. 623—23.46 | 12 Claims |
1. A prosthesis for implantation into a bone, comprising:
a sleeve having an inner passageway containing a central opening with at least one channel located on the periphery of said
central opening, and an outer surface, sized to fit tightly within the bone, containing at least one section contacting the
bone, said section having a textured surface to promote bone ingrowth;
and a rod component comprising an elongated shank having an outer surface extending between a proximal end and a relatively
narrow distal end, with at least a portion of said shank having at least one lobe extending therefrom, said portion of said
shank sized to fit within said inner passageway of said sleeve;
wherein when said rod component is inserted through said sleeve which has been inserted tightly into the bone, the interaction
between said lobe of said shank of said rod component and said channel within said sleeve allow for a small amount of rotation,
thus reducing torsional shear stress between said prosthesis and the bone.
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