Patent ID: 9610168
Date: 2017-04-04
CPC Classifications: A61F

Claim:
1. An ankle replacement prosthesis, comprising: a tibial implant for implanting onto a tibia having a tibial-facing surface and a tibial implant lower surface opposite said tibial-facing surface and having an anterior end and a posterior end; a talar implant for implanting onto a talus having a talar-facing surface and a talar implant upper surface opposite said talar-facing surface and having an anterior end and a posterior end; and an intermediate implant having an anterior end and a posterior end and a tibial-facing surface and a talar-facing surface, said intermediate implant fitting between said tibial implant and said talar implant, wherein said tibial-facing surface of said intermediate implant fixedly attaches to said tibial implant and said talar-facing surface of said intermediate implant has an articulating surface that articulatingly engages said talar implant, wherein said intermediate implant has a first edge of said articulating surface at an anterior end thereof and a second edge of said articulating surface at a posterior end thereof, wherein said first edge is at a different elevation than said second edge, with elevation being defined with respect to a top surface of said intermediate implant; wherein said tibial-facing surface further comprises a fin located closer to said posterior end of said tibial implant than said anterior end of said tibial implant, said fin having a proximal fin end attached to said tibial-facing surface and having a distal fin end depending from said tibial-facing surface at a fin angle measured from said tibial-facing surface; wherein said tibial-facing surface further comprises at least one peg located closer to said anterior end of said tibial implant than said fin is located, said at least one peg having a proximal peg end attached to said tibial-facing surface and having a distal peg end depending from said tibial-facing surface at a peg angle measured from said tibial-facing surface; and wherein said peg further comprises a tip portion constituting a portion of a sphere followed by a portion of a cone followed by a surface formed by a circular arc in revolution around a longitudinal axis followed by a cylindrical surface.