Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1995-09-29
1998-03-10
Shay, Randy C.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 23, A61F 236
Patent
active
057255865
ABSTRACT:
A bone prosthesis has a stem with a hollow interior and an external surface that allows wedging contact with surrounding bone while transferring strain at a level comparable to that of natural bone. The stem is cast about an irregular plug body, which is then removed, leaving a wall thickness that satisfies the opposing constraints of high strength and relatively low stiffness. The plug narrows the prosthesis wall thickness in upper regions thereof and strengthens the wall about regions of recessed or discontinuous features, or high load coupling, to assure that the stem has adequate strength in regions of high strain, while effectively coupling strain to surrounding bone. The prosthesis is produced in a range of sizes, and plugs or entire molds for casting the hollow body are readily made and modified by a three-dimensional printing mold fabrication technique.
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Uziel, Y., "Art to part in 10 days," Machine Design, (1995) pp. 56-58, 60.
Johnson & Johnson Professional Inc.
Shay Randy C.
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