Surgery – Instruments – Orthopedic instrumentation
Patent
1996-03-29
1999-03-02
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 69, 606 70, 606 73, A61B 1770
Patent
active
058764020
ABSTRACT:
The present invention is a polyaxial locking screw plate assembly for immobilization of vertebral bones, via fixation to surfaces thereof. The assembly includes a plate, having an upper portion and a lower portion, each of which has a pair of tapered holes, into which holes coupling elements and bone screws may be inserted. The upper part of the holes further includes an annularly recessed channel in which a snap-ring is disposed. The coupling elements each have an axial taper which matches the taper of the holes, and an interior semi-spherical concave surface in which the semi-spherical head of a bone screw may be polyaxially mounted. The bone screws are inserted through the holes until the coupling element engages and expands the snap-ring. Once the coupling element is fully seated in the hole, thereby locking the screw in place and the coupling element in the hole, the snap-ring contracts to its undeflected position and prevents the coupling element and screw from backing out of the hole in the event of loosening.
REFERENCES:
patent: 5057111 (1991-10-01), Park
patent: 5520690 (1996-05-01), Errico et al.
Errico Joseph P.
Errico Thomas J.
Ralph James D.
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