Radial head implant
AssigneeIMDS Corporation
InventorJames Brownhill
Life of this patent
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Abstract
A radial head prosthesis for implantation in a distal radius. The implant includes a head portion and a stem portion. The stem portion has a cylindrical shaft and tapered tip. The head portion includes a recess for engagement with the stem portion. The head portion includes a first bearing surface for articulation with a humerus, and a second bearing surface for articulation with an ulna. The second bearing surface includes at least one concave and one convex portion immediately adjacent one another.
Claims20
An implantable prosthesis for replacing the proximal head of a radius, the radius distal to a humerus and adjacent an ulna, the radius having an intramedullary canal, the prosthesis comprising:
- a stem portion for insertion into the intramedullary canal to anchor the prosthesis in the radius;
- and
- a head portion attached to the stem portion, the head portion having a proximal end, a distal end, and a circumferential peripheral wall extending between the proximal end and the distal end, the head proximal end including a first bearing surface for articulation with the humerus, the circumferential peripheral wall including a second bearing surface for articulation with the ulna;
- wherein the second bearing surface includes first and second convex portions, a first concave portion, and a third convex portion, wherein the entire second bearing surface is either concavely or convexly curved.
An implantable prosthesis for replacing the proximal head of a radius, the radius distal to a humerus and adjacent an ulna, the radius having an intramedullary canal, the prosthesis comprising:
- a stem portion for insertion into the intramedullary canal to anchor the prosthesis in the radius;
- and
- a head portion attached to the stem portion, the head portion having a first end, a second end, and a circumferential peripheral wall extending between the first end and the second end;
- wherein the head portion has a head outer profile defined between the first end and the second end, and wherein the head outer profile consists of a contiguous series of arc segments.
Dependencies are inferred from the claim text.