Composite orthopedic implant

Details Composite orthopedic implant Composite orthopedic implant

A - Human Necessities

61

F

A61F 2/32 (2006.01) A61F 2/30 (2006.01) A61L 27/00 (2006.01) B29C 53/58 (2006.01) B29C 70/22 (2006.01) A61F 2/36 (2006.01)

Patent

CA 2131301

A beam (10) adapted for implantation within a bone is able to support bend- ing and torsional loading forces applied thereto. The beam (10) has a stiffness de- fined 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 im- plantation within the bone. The beam is made from an elongated core (14) formed of chopped carbon fibers embedded in a thermoplastic polymer matrix. Encasing the core (14) is a sheath (16) formed of carbon reinforced filament fibers embedded in the thermoplastic polymer which is wound in spiral formation around the core (14) and molded thereto. The winding angle and the sheath (16) thickness along the beam may be varied to vary the modulus of elasticity to match that of the cortical bone ad- jacent thereto.

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