Depuy Synthes Products, Inc.

Depuy Spine, Inc.

Seung Kyu Daniel Kwak

Nam T Chao

Andrea Burke

John Riley Hawkins

Amie R Borgstrom

Erasmo A Lopez

Philip Watt

Steven Greco

Jeffrey Loftus-Vergari

Timothy Josephson

A bone fixation system includes a first anchor, a second anchor, and a third anchor. The first anchor is configured to be inserted into a first target location within a bone. The first anchor including a first head and a first shaft that extends from the first head and is configured to couple the first anchor to the first target location. The first head defines a head bore extending therethrough along a head bore axis. The first shaft defines a shaft bore extending therethrough along a shaft bore axis. The second anchor is sized to extend through the head bore and out of the head bore so as to couple to a second target location within the bone. The third anchor is sized to extend through the shaft bore and out of the shaft bore to a third target location within the bone.

Screw-in-screw bone fixation system

A bone screw assembly includes a screw body, including anchor portion and rod-receiving portion, and a rod seat movably mounted in the screw body to allow for controlled angulation between a spinal connection element disposed in the rod seat and the screw body. The rod seat is pivotable in one or more selected directions about one or more axes relative to the screw body. The rod seat may include a first lower rod seat element disposed in a recess of the screw body having a cylindrical bottom surface to facilitate pivoting in a first direction. A second lower rod seat element is stacked on the first lower rod seat element and has a conical bottom surface abutting a top surface of the first lower rod seat element to facilitate pivoting in a second direction.

Adjustable bone screw assembly

An intervertebral disc prosthesis comprises a left prosthesis component and a symmetric right prosthesis component positioned in an intervertebral space. Each prosthesis component includes a superior vertebra facing surface, an inferior vertebra facing surface, and a substantially spherical bearing surface. The bearing surface is positioned between the superior vertebra facing surface and the inferior vertebra facing surface. The superior vertebra facing surface is provided on a superior endplate and the inferior vertebra facing surface is provided on an inferior endplate. The superior endplate is operable to rotate relative to the inferior endplate upon the bearing surface. Each prosthesis component further comprises an elastic member positioned between an endplate and the bearing surface. The elastic member may be substantially cylindrical with a plurality of resilient ribs. Flexion/extension, lateral bending, and torsional movement are allowed by a combination of endplate rotation upon the bearing surface and compression of the elastic member.

Intervertebral disc prosthesis having multiple bearing surfaces

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Grafton, MA, United States of America

Seung Kyu Daniel Kwak