05879350 is referenced by 522 patents and cites 22 patents.

A multi-axial bone screw assembly includes a bone screw having a partially spherical head. The bone screw head is truncated at an upper surface in which a tool receiving recess is defined. The assembly includes a receiver member including a central bore that defines a tapered recess to receive a contracting collet carrying the head of the bone screw. The bore of the receiver member also defines a channel communicating with the recess and configured to receive a spinal rod therein. A portion of the channel is threaded to receive a set screw above the rod. The assembly also includes a contracting collet disposed between the rod and the head of the bone screw. The collet defines a partially spherical recess to receive the head of the bone screw, and includes deflectable fingers that substantially surround the screw head. As the set screw is tightened into the receiver member, the set screw compresses the rod against the collet, which presses the collet into the tapered recess of the receiver member, thereby deflecting the fingers of the collet against the bone screw head.

Title
Multi-axial bone screw assembly
Application Number
8/719005
Publication Number
5879350
Application Date
September 24, 1996
Publication Date
March 9, 1999
Inventor
Troy Drewry
Memphis
TN, US
Michael C Sherman
Memphis
TN, US
Agent
Woodard Emhardt Naughton Moriarty & McNett
Assignee
SDGI Holdings
DE, US
IPC
A61B 17/56
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