A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/58 (2006.01) A61B 17/70 (2006.01)
Patent
CA 2123353
ABSTRACT A composite surgical spinal fixation system including a bone bolt having end portions that are adapted to be surgically implanted into a patient's spine at first and second spaced apart positions and a central portion of the bone bolt defining a load transfer surface, the bone bolt having a second upper threaded section for threadably receiving a nut at a shaped, countersunk interface. As an alternate embodiment, a bone screw provides an upper enlarged head with a lower coarsely threaded shank. A composite plate having upper and lower surfaces and outer opposed edges is provided with an elongated slot for accommodating a selected bone bolt or bone screw. The plate edges carry fine adjustments extending between the upper and lower surfaces of the plate and a load transfer washer interfaces the plate and the selected bone bolt or bone screw for distributing load (and reducing stress) from the bone bolt (or screw) to the plate. The composite plate adopts a curved configuration via asymmetric ply lamination or by melt- forming. The curvature of the plate is dictated by the natural lordotic curvature of the patient's spine. The plate is comprised of either a plurality of laminal arranged in a specific ply sequence or a plurality of fibers or tows arranged through winding and/or placement. Electrochemical compatibility with the composite plate is ensured by careful selection of the materials comprising the attachment means and the washer mechanism.
Small Laura C.
Swain Robert E. III
Borden Ladner Gervais Llp
Smith & Nephew Richards Inc.
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