Patent ID: 8277490

Claim:
A surgical screw comprising: a bone anchor section; a screw body further comprising: a receiver body comprising: a cylindrical wall having a proximal edge and a distal edge; a spherical base disposed on the proximal edge of the cylindrical wall; a plurality of openings disposed in the cylindrical wall; an internal semi-circular, convex recess disposed in the spherical base for accepting the bone anchor section; an opening adjacent to the internal semi-circular, convex recess allowing the bone anchor section to project through the opening; at least one rod saddle disposed within the receiver body adjacent to the spherical base and adapted to mate the receiver body with a rod, comprising: two faces wherein a first mating face of the rod saddle is curved and adapted to mate with a rod and a second articulating face is curved and adapted to mate with the spherical base and allow articulation of the rod; a compression nut, wherein the compression nut comprises a proximal face, a distal face, and a receiver body interface wall adapted to interface with the receiver body; wherein the distal face is conical; and wherein the compression nut compresses the rod against the rod saddle.