Patent ID: 8926700
Filing Date: 2015-01-06
Classification: A61B,A61F

Abstract:
1. A spinal implant kit for replacing at least one removed facet of a resected vertebra, wherein the resected vertebra has a pedicle saddle point (S 1 ) defining an intersection between a posterior pedicle bone surface and a longitudinal axis of the pedicle wherein the at least one removed facet is a natural right superior facet, a natural left superior facet, a natural right inferior facet, or a natural left inferior facet, wherein the at least one removed facet has an articulating surface that, prior to removal of the at least one removed facet has a most medial and anterior point (P 1 ), the spinal implant kit comprising: a plurality of fixation elements; and a plurality of components for replacing a first facet of the at least one removed facet, wherein the components have the same parametric features characterized by a first dimension and a second dimension; wherein each of the components is of monolithic construction and comprises a generally convex semispherical surface, wherein the first and second dimensions vary in magnitude disproportionately relative to each other among the components such that a subset of the components is selectable to provide a selected prosthesis dimensioned to match a morphology of the resected vertebra; wherein a subset of the fixation elements is selectable to attach the selected prosthesis to the resected vertebra, wherein the selected prosthesis comprises: an articulating surface positioned to approximate an original position of the first facet when the selected prosthesis is attached to the resected vertebra; and a bone apposition surface to abut a resection surface of the vertebra; wherein the first and second dimensions define at least one of the bone apposition surface and the articulating surface; wherein the semispherical surface is incorporated in a ball and socket joint when the selected prosthesis is attached to the resected vertebra, wherein the articulating surface is concave and comprises one or more planar portions, wherein each of the components is configured with an aperture that extends completely there through.