Patent ID: 8216315
Filing Date: 2012-07-10
Classification: A61B,A61F

Abstract:
1. An orthopedic spacer device for positioning between adjacent vertebral bones, the device comprising: a cylindrical spacer body having a longitudinal axis and a bore having a longitudinal axis extending coaxially with the spacer body longitudinal axis through upper and lower surfaces thereof, the upper and lower surfaces each having a circumference; at least two relative angle designation marks disposed on said at least one of said upper and lower surfaces, said angle designation marks being remote from one another at a predetermined spatial distance about the circumference of at least one of said upper and lower surfaces such that once said spacer body is inserted between adjacent vertebral bones and the spacer body is rotated, a rotational angle of the spacer body relative to a known reference is determinable by comparing the rotation of said angle designation marks about said longitudinal axis of the spacer body; and an annular groove situated between the tapered upper and lower surfaces of said spacer body into which a manipulation tool is seatable, said groove being of a constant width such that said spacer body may rotate freely with respect to said manipulation tool.