Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1991-04-10
1993-01-26
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 16, 623 22, A61F 228, A61F 232, A61F 236
Patent
active
051819309
ABSTRACT:
A beam adapted for implantation within a bone is able to support bending and torsional loading forces applied thereto. The beam has a stiffness defined by a modulus elasticity, which stiffness varies along the length of the beam to match the corresponding stiffness of the cortical bone adjacent the beam after implantation within the bone. The beam is made from an elongated core formed of continuous filament carbon fibers embedded in a thermoplastic polymer matrix with the carbon filaments extending in a direction substantially parallel to the longitudinal axis of the beam. Encasing the core is a filler molded to the core, which filler is made up of the same thermoplastic polymer as the core but contains no reinforcing carbon fibers. The filler provides the prosthesis with a shape generally conforming to the desired shape of the final prosthetic implant. A sheath formed of carbon reinforced filament fibers embedded in the thermoplastic polymer is wound in spiral formation around the filler and molded thereto. The winding angle and the sheath thickness along the beam may be varied to vary the modulus of elasticity to match that of the cortical bone adjacent thereto.
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"Stiffness and Strength tailoring of a hip prosthesis made of advanced composite materials", by Chang, F-K, Perez, J. L., and Davison, J. R., in Journal of Biomedical Materials Research, vol. 24, 1990, pp. 873-899.
Crippen Thomas E.
Dumbleton John H.
Lin Ruey Y.
Stark Casper F.
Akers Lawrence C.
Augustin Raymond W.
Isabella David
Nguyen Dinh X.
Pfizer Hospital Products Group Inc.
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