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US 8,556,981 B2Granted
Laser-produced porous surface
AssigneeHowmedica Osteonics Corp.
InventorsEric Jones, Christopher J. Sutcliffe, Robin Stamp
Life of this patent
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Abstract
An implant having a porous tissue ingrowth structure and a bearing support structure is disclosed. The implant includes a metal insert having a bone ingrowth structure, an intermediate structure and a bearing support structure. A bearing surface is formed from a polymer material and attached to the bearing support structure. The intermediate structure has a porosity sufficient to inhibit the polymer material from translating through the bearing support structure to the bone ingrowth structure.
Claims12
A medical implant comprising:
- a monolithic metal insert having a bone ingrowth structure, an intermediate structure and a bearing support structure, said bone ingrowth structure having a porosity sufficient to promote bone ingrowth;
- a bearing surface formed from a polymer material, said bearing surface being attached to said bearing support structure,
- wherein said bearing support structure has a greater porosity relative to the intermediate structure such that the bearing support structure allows the polymer material of the bearing surface to attach thereto and such that the intermediate structure inhibits said polymer material from translating through said bearing support structure to said bone ingrowth structure, and
- wherein, along an axis passing through the bone ingrowth structure, the intermediate structure, and the bearing support structure, each of the bone ingrowth structure and the bearing support structure includes respective first portions having a first porosity and respective second portions having a second porosity, said first porosity of said respective first portions being different than said second porosity of said respective second portions.
1 more element
Dependencies are inferred from the claim text.