Bone fixation apparatus

Details Bone fixation apparatus Bone fixation apparatus

1991-03-27

1992-07-14

Isabella, David

Surgery

Instruments

Orthopedic instrumentation

606 71, 606 73, 623 13, A61F 504, A61F 208, A61B 1756, A61B 1758

Patent

active

051298996

ABSTRACT:
A surgical spinal fixation system includes a bone bolt having first 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 sections 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 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.

REFERENCES:
patent: 2406832 (1946-09-01), Hardinge
patent: 4246660 (1981-01-01), Wevers
patent: 4887595 (1989-12-01), Heinig et al.
patent: 4987892 (1991-01-01), Krag et al.
patent: 5041113 (1991-08-01), Biedermann et al.
patent: 5053036 (1991-10-01), Perren et al.

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