05733286 is referenced by 345 patents and cites 7 patents.

A polyaxial orthopedic device for use with rod implant apparatus includes a screw having a bowl-shaped head and a coupling element. The coupling element has a rod receiving channel and an axial bore into which the head of the screw may be inserted. The interior surface of the bore is inwardly curvate at the lower end thereof to form a socket for polyaxially retaining the curvate head of the screw. In an initial position the screw head remains polyaxially free with respect to the coupling element. There is also a hemispherical insert which is seated on the top of the screw head, permitting it to rotate, but which may be compressed onto the head to permit the head of the screw to be locked in the bore. The rod is inserted into the channel and a top locking nut or set screw locks presses down on the rod and hemispherical insert to secure the assembly completely.

Title
Rod securing polyaxial locking screw and coupling element assembly
Application Number
8/799722
Publication Number
5733286
Application Date
February 12, 1997
Publication Date
March 31, 1998
Inventor
James D Ralph
Oakland
NJ, US
Thomas J Errico
Summit
NJ, US
Joseph P Errico
Far Hills
NJ, US
Agent
Joseph P Errico Esq
Assignee
Third Millennium Engineering
NJ, US
IPC
A61B 17/70
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