Patent ID: 6800095
Filing Date: 2004-10-05
Classification: A61F,A61L,Y10T

Abstract:
A femoral head comprising:a sintered polycrystalline diamond compact, a substrate located on said polycrystalline diamond compact, solvent-catalyst metal located in said substrate, a diamond table sintered to said substrate, a gradient transition zone between said substrate and said diamond table in said polycrystalline diamond compact, said gradient transition zone having a substrate side and a diamond table side, said gradient transition zone having both solvent-catalyst metal and diamond therein, and said gradient transition zone exhibiting a transition of ratios of percentage content of solvent-catalyst metal to diamond from one side of said gradient transition zone to another such that at a first point in said gradient transition zone near said substrate side, the ratio of percentage content of solvent-catalyst metal to diamond is greater than it is at a second point in said gradient transition zone closer to said diamond side than said first point, chemical bonds between said diamond table and said substrate which tend to secure said diamond table to said substrate, and a sintered polycrystalline diamond load bearing and articulation surface on said polycrystalline diamond compact, said sintered polycrystalline diamond load bearing and articulation surface including polycrystalline diamond, said sintered polycrystalline diamond load bearing and articulation surface being formed to present a shape that is at least partially convex spherical; wherein diamond in said sintered polycrystalline diamond compact has a coefficient of thermal expansion CTECd, and wherein said substrate has a coefficient of thermal expansion CTEsub, and wherein CTECd is not equal to CTEsub, wherein said diamond in said polycrystalline diamond compact has a modulus MCd, and wherein said substrate in said polycrystalline diamond compact has a modulus Msub, and wherein MCd, is not equal to Msub.