Allograft bone fixation screw method and apparatus

Details Allograft bone fixation screw method and apparatus Allograft bone fixation screw method and apparatus

1999-03-24

2000-08-08

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 72, A61B 1756

Patent

active

060995297

ABSTRACT:
A bone screw assembly constructed of allograft bone comprising a screw shank with a uniform diameter threaded portion, an unthreaded portion with a outwardly tapered end terminating in a drive head defining a wedge shaped configuration to form an undercut for the drive head.
In operation a bore is drilled in the two bone sections, with one bone section being over drilled with the top portion of the over drilled bore having a tapered geometry which widens from the diameter of the bore. The bone screw is driven into the previously cut bore in the bone sections until the tapered surface of the bore engages the tapered undercut surface of the screw.

REFERENCES:
patent: 4724731 (1988-02-01), Onofrio
patent: 5012624 (1991-05-01), Dahlgren

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