Patent ID: 7585325
Filing Date: 2009-09-08
Classification: A61F

Abstract:
1. An intervertebral implant with a top contacting element, a bottom contacting element, and a core arranged between the top contacting element and the bottom contacting element, said core comprising an upper spherical bearing surface for engaging a spherical bearing socket of the top contacting element having a radius substantially equal to a radius of the upper spherical bearing surface of the core, and said core further comprising a lower spherical bearing surface for engaging a spherical bearing socket of the bottom contacting element having a radius substantially equal to a radius of the lower spherical bearing surface of the core, wherein the radius of the lower spherical bearing surface and the radius of the upper spherical bearing surface of the core differ by at least a factor of 5, and wherein the bearing socket with the larger radius is machined in a flat bottom of a recess in the adjacent contacting element.