Patent ID: 9707093
Date: 2017-07-18
CPC Classifications: A61F

Claim:
1. A motion-preserving artificial joint comprising: a) a core comprising: a hub, a flange, and a biocompatible elastomer layer surrounding the flange, wherein the hub comprises a rigid material able to maintain a selected height, and a curved surface, and wherein the hub is disposed within the flange so that at least a portion of the curved surface of the hub extends above the surface of the flange; wherein said flange is a rigid component able to provide internal structural support for the elastomer layer, and said elastomer layer has a Shore hardness of approximately 60 A to 100 A, a modulus of elasticity of approximately 0.01 GPa to 0.1 GPa, and a coefficient of friction with dry polished steel of 1 or less; b) an endplate comprising: a structural component able to engage a surface, a first low-friction surface that engages the elastomer layer, and a second low-friction surface that engages the curved surface of the hub; and c) a torus collar on the surface of the hub and a corresponding negative space torus in the surface of the second low-friction surface, wherein said collar is able to be positioned into said negative space torus and reduce displacement of the core from the endplate and maintain and limit rotation of the components to approximately 90 degrees.