Coated and layered vertebral disc arthrodesis prothesis

A vertebral disc prosthesis for cervical, thoracic, lumbar disc arthrodesis, comprising:

• a. a superior surface layer, an inferior surface layer, a midsection, and a hollow center on a longitudinal axis to serve as a graft window;
• b. wherein the superior surface layer and inferior surface layer each comprises an approximately 0.5 to 2 mm thick layer of lattice made from tantalum alloy or titanium alloy material with pore sizes in the spongy matrix in the range of 200-900 μm, with a porosity of each layer of 55-75%;
• c. wherein the midsection of the implant comprises a random or pseudorandom lattice interposed between the superior surface layer and inferior surface layer, wherein the lattice comprises tantalum alloy or titanium alloy material with a thickness of between 4 mm and 14 mm, and a pore size of 0.5 mm to 5.0 mm;
• and
• d. wherein there is a gradient of pore sizes along the longitudinal axis with the smallest pore sizes comprising the superior and inferior surfaces and the largest pore sizes comprising the midsection.

A vertebral disc prosthesis for cervical, thoracic, lumbar disc arthrodesis, comprising:

• a. a circular (torodial), kidney, or parallelepipedal shaped implant with a superior surface layer, an inferior surface layer, a midsection, and a hollow center on a longitudinal axis to serve as a graft window;
• b. wherein each surface layer contacts a vertebra;
• c. wherein the superior surface layer and inferior surface layer each comprises an approximately 0.5 mm to 2 mm thick layer of lattice made from tantalum alloy or titanium alloy material with pore sizes in the spongy matrix in the range of 200-900 μm, with a porosity of each layer of 55-75%;
• d. wherein the midsection of the implant comprises a random or pseudorandom lattice interposed between the superior surface layer and inferior surface layer, wherein the lattice comprises tantalum alloy or titanium alloy material with a thickness of between 4 mm and 14 mm, and a pore size of 0.5 mm to 5.0 mm;
• e. wherein the lattices of the superior surface layer, inferior surface layer and midsection are roughened with a macro surface roughness;
• and
• f. where the lattices of the superior surface layer, inferior surface layer and midsection are coated with hydroxyapatite (HA) or tricalcium phosphate (TCP), with a coating thickness of approximately 25-35 um.