Surgery – Instruments – Orthopedic instrumentation
Patent
1995-04-13
1996-05-28
Tucker, Guy
Surgery
Instruments
Orthopedic instrumentation
606 69, 606 70, 606 73, A61B 1770
Patent
active
055206905
ABSTRACT:
The present invention is a polyaxial locking screw plate assembly for immobilization of vertebral bones, via fixation to surfaces thereof. In one embodiment the invention includes a plate, having an upper portion and a lower portion, each of which has a pair of threaded holes, into which holes coupling elements may be screwed. The coupling elements each have a threaded cylindrical exterior, and have an interior semi-spherical concave surface in which the semi-spherical head of a bone screw may be polyaxially mounted. In a second embodiment, the present invention includes a similar plate, having holes which are, however, threaded part of the way through the plate. In this embodiment, the bottom portion of the holes of the plate, additionally, have a curved interior surface which forms an annular lip for supporting a semi-spherical head portion of a bone screw. The coupling element of this embodiment is a short threaded cylindrical piece, having a concave bottom which locks the screw into the hole. Variations of each embodiment have means associated with the holes and/or the coupling element for locking the angle of the screw to the plate. A further variation of the plate of this invention includes a pair of spikes which may be used to temporarily lock the plate to the exposed bone.
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"Cervi-Lok Cervical Fixation System", Spinetech, Inc., 980 East Hennepin Ave., Minneapolis, Minn 55414, 1994., 2 pages.
"System Overview--Axis Fixation System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994, 6 pages.
"Surgical Technique--Orion Anterior Cervical Plate System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994, 25 pages.
"Surgical Technique--ZPlate-ATL Anterior Fixation System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994, 27 pages.
Errico Joseph P.
Errico Thomas J.
Ralph James
Errico J. P.
Tucker Guy
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