Patent ID: 6719796
Filing Date: 2004-04-13
Classification: A61B,A61F

Abstract:
A prosthesis comprising:(a) at least one set of substantially identical first and second opposed bearing surface assemblies, each of said bearing surface assemblies having a substantially circular outer bearing surface, an inner face opposite to said outer bearing surface and a central axis through said outer bearing surface and said inner face; (b) each of said opposed bearing surfaces assemblies having a wall extending substantially normal and away from said inner face, each of said walls having a free end with at least one inclined cam surface, said inclined cam surface of said first bearing surface assembly cooperatively rests against said inclined cam surface of said second bearing surface assembly; and (c) means for rotating said bearing surfaces of said first and second opposed bearing surface assemblies co-axially towards and away from each other, said rotating means being integral with the bearing surface assemblies, whereby relative rotational of said opposed bearing surface assemblies around said central co-axis by the rotating means in one direction will move the bearing surfaces of said first and second opposed bearing surface assemblies away from each other and relative rotation of said opposed bearing surface assemblies around said central co-axis by the rotating means in the opposite direction will move the bearing surfaces of said first and second opposed bearing surface assemblies towards each other, thereby increasing and decreasing respectively, the height of said prosthesis along said central co-axis.