05797911 is referenced by 525 patents and cites 26 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 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 crown member disposed between the rod and the head of the bone screw. As the set screw is tightened into the receiver member, the set screw compresses the rod against the crown member, which presses the head of the bone screw into the tapered recess. In one embodiment, the head of the bone screw includes a flared edge that penetrates at least the crown member as the assembly is tightened.

Title
Multi-axial bone screw assembly
Application Number
8/719161
Publication Number
5797911
Application Date
September 24, 1996
Publication Date
August 25, 1998
Inventor
Troy Drewry
Memphis
TN, US
Michael C Sherman
Memphis
TN, US
Agent
Woodard Emhardt Naughton Moriarity & McNett
Assignee
SDGI Holdings
TN, US
IPC
A61B 17/70
View Original Source