Patent ID: 6083226
Filing Date: 2000-07-04
Classification: A61B

Abstract:
The combination of a bone fixation element and coupling piece for a spinal column fixation assembly,said bone fixation element comprising:(a) a screw or hook with a portion for fixing to the bone or part thereof;(b) an intermediate portion that is at least partially spherical, and(c) a threaded upper portion,said coupling piece comprising:(a) a seat portion having a concave inner surface for receiving said at least partially spherical intermediate portion of said bone fixation element, and a convex outer surface;(b) a throughbore through which said threaded upper portion of said bone fixation element extends;(c) a nut for coupling to said bone fixation element threaded upper portion to fasten said bone fixation element to said coupling piece, and(d) a bar fixation portion to be coupled to a bar.