05520690 is referenced by 384 patents and cites 8 patents.

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.

Anterior spinal polyaxial locking screw plate assembly
Application Number
Publication Number
Application Date
April 13, 1995
Publication Date
May 28, 1996
James Ralph
71 Manito Ave., Oakland, 07436
Thomas J Errico
5 Crest Acre Ct., Summit, 07901
Joseph P Errico
P.O. Box 3070, Garden City, 11531
J P Errico
A61B 17/70
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