Patent ID: 8845729
Filing Date: 2014-09-30
Classification: A61F

Abstract:
1. A prosthetic disc for insertion between adjacent vertebrae, the prosthetic disc comprising: upper and lower plates having outer surfaces locatable against the respective vertebrae, and inner surfaces, wherein at least one of the inner surfaces of the upper and lower plates is a curved inner surface; a rigid mobile one-piece core having an outermost peripheral edge along an outermost circumference of the core, said core being removably disposed between the inner surfaces of the upper and lower plates and being arranged to slide and translate with respect to both the upper and lower plates when the prosthetic disc is implanted; and a rigid peripheral restraining structure formed on at least one of the plates, which structure provides a boundary which engages the outermost peripheral edge of the core and which prevents the outermost peripheral edge of the core from extending radially beyond the peripheral restraining structure as the core slides and translates with respect to both the upper and lower plates when the prosthetic disc is implanted; wherein the peripheral restraining structure comprises a U-shaped member defining an inwardly projecting flange extending from at least one of the upper and lower plates at a periphery of the plates; wherein the mobile core includes a groove at a periphery thereof, the inwardly projecting flange abutting a surface defining the groove as the core slides and translates with respect to both the upper and lower plates when the prosthetic disc is implanted to provide the boundary.