Composite orthopedic implant

Details Composite orthopedic implant Composite orthopedic implant

A - Human Necessities

61

F

A61F 2/36 (2006.01) A61F 2/30 (2006.01) A61L 27/00 (2006.01) A61L 27/18 (2006.01) A61L 27/44 (2006.01) B29C 70/86 (2006.01) A61F 2/00 (2006.01) B29C 53/58 (2006.01)

Patent

CA 2106380

A beam (10) adapted for implantation within a bone is able to support bending and torsional loading forces applied there- to. The beam (10) has a stiffness defined by a modulus elasticity, which stiffness varies along the length (18, 20, 22) of the beam (10) to match the corresponding stiffness of the cortical bone adjacent the beam (10) after implantation within the bone. The beam (10) is made from an elongated core (12) formed of continuous filament carbon fibers embedded in a thermo-plastic polym- er matrix with the carbon filaments extending in a direction substantially parallel to the longitudinal axis of the beam (10). Enca- sing the core is a filler (14) molded to the core (12), which filler (14) is made up of the same thermoplastic polymer as the core (12) but contains no reinforcing carbon fibers. The filler (14) provides the prosthesis (10) with a shape generally conforming to the desired shape of the final prosthetic implant. A sheath (16) formed of carbon reinforced filament fibers embedded in the thermoplastic polymer is wound in spiral formation around the filler (14) and molded thereto. The winding angle and the sheath (16) thickness along the beam (10) may be varied to vary the modulus of elasticity to match that of the cortical bone adjacent thereto.

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