Patent ID: 8597358

Claim:
A dynamic interbody device configured to be positioned between a first vertebra and a second vertebra of a human spine, comprising: a first member configured to couple to the first vertebra, the first member having an inferior surface configured to contact the first vertebra, wherein a portion of the inferior surface configured to be in contact with the first vertebra has a first width in a transverse plane of the human spine, wherein the first width comprises a maximum width of the portion of the first member configured to be disposed in an intervertebral space between the first vertebra and the second vertebra; a second member coupled to the first member, wherein the second member is configured to move relative to the first member such that axial rotation of the first member relative to the second member results in lateral movement of the first member relative to the second member, and lateral movement of the first member relative to the second member results in axial rotation of the first member relative to the second member, and such that movement of the first member relative to the second member is configured to allow for coupled axial rotation and lateral bending of the first vertebra relative to the second vertebra such that axial rotation of the first vertebra relative to the second vertebra results in lateral bending of the first vertebra relative to the second vertebra, and lateral bending of the first vertebra relative to the second vertebra results in axial rotation of the first vertebra relative to the second vertebra; and a third member coupled to the second member, the third member having a superior surface configured to contact the second vertebra, wherein a portion of the superior surface configured to be in contact with the second vertebra has a second width in the transverse plane of the human spine, wherein the second width comprises a maximum width of a portion of the second member configured to be disposed in the intervertebral space between the first vertebra and the second vertebra, wherein the first width is greater than the second width, and wherein the third member is configured to move relative to the second member to accommodate flexion and extension of the first vertebra relative to the second vertebra when the first member and the third member are coupled to the first vertebra and second vertebra.