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.

Title
Anterior spinal polyaxial locking screw plate assembly
Application Number
8/421087
Publication Number
5520690
Application Date
April 13, 1995
Publication Date
May 28, 1996
Inventor
James Ralph
71 Manito Ave., Oakland, 07436
NJ, US
Thomas J Errico
5 Crest Acre Ct., Summit, 07901
NJ, US
Joseph P Errico
P.O. Box 3070, Garden City, 11531
NY, US
Agent
J P Errico
IPC
A61B 17/70
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