Patent ID: 8092530
Filing Date: 2012-01-10
Classification: A61F,Y10S

Abstract:
1. A cartilage implant comprising: an articular end for repair of articular cartilage defects having an oval perimeter, a convex upper face, and a concave lower face, the convex upper face having a first circular pitch radius and a first circular roll radius, the concave lower face having a first surface comprising a second circular pitch radius and a second circular roll radius, and at least two second surfaces both external to the first surface and both tangent to the first surface, each second surface having a third circular pitch radius and a third circular roll radius, the convex upper face blending into a rim, wherein at least a first and second portion of the rim extends at least a first distance along the vertical axis and a third and fourth portion of the rim tapers inward along the vertical axis, the rim blending into the concave lower face; and a stem extending from the concave lower face away from the convex upper face, the stem having a plurality of oval shaped perimeters in planes perpendicular to the vertical axis, wherein: the stem has a first stem portion having a maximum oval shaped perimeter extending at least one millimeter from the concave lower face away from the convex upper face along the vertical axis, and a second stem portion extending from the first stem portion away from the convex upper face along the vertical axis, the second stem portion having a plurality of second stem oval shaped perimeters decreasing in diameter along at least one axis from the maximum oval shaped perimeter of the first portion to a lesser second stem oval shaped perimeter along the vertical axis of the stem; and wherein the stem blends into the concave lower face, and wherein the articular end and the stem each consist essentially of: a graphite core and a pyrocarbon coating.