A cast orthopaedic implant and method of making same

Details A cast orthopaedic implant and method of making same A cast orthopaedic implant and method of making same

A - Human Necessities

61

L

A61L 27/56 (2006.01) A61F 2/28 (2006.01) A61F 2/30 (2006.01) A61L 27/04 (2006.01) A61L 27/30 (2006.01) B22C 9/04 (2006.01) B22D 19/00 (2006.01)

Patent

CA 2181222

A method of forming a cast orthopaedic implant having a porous surface layer is disclosed. The method includes placing a porous layer on a wax replica of the implant such that a portion of the pres of the layer are filled with the wax material. The wax replica and porous surface layer are coated by a ceramic material consistent with investment cast technology. The ceramic material fills the remainder of the pores of the porous layer. After the ceramic material is solidified, the wax material is melted away leaving a cavity within the ceramic material. The pores once filled by wax are now exposed and extend into the cavity. A molten metal is poured into the cavity and partially melts the exposed porous layer to form a melt bond with the molten metal. When the metal is cooled, the ceramic material is stripped away exposing the portion of the porous layer previously filled with the ceramic medium.

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