Adjustable bone screw assembly
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United States of America Patent
Stats
-
May 31, 2011
Grant Date -
Aug 5, 2010
app pub date -
Apr 7, 2010
filing date -
Oct 21, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bone screw assembly includes a screw body, including anchor portion and rod-receiving portion, and a rod seat movably mounted in the screw body to allow for controlled angulation between a spinal connection element disposed in the rod seat and the screw body. The rod seat is pivotable in one or more selected directions about one or more axes relative to the screw body. The rod seat may include a first lower rod seat element disposed in a recess of the screw body having a cylindrical bottom surface to facilitate pivoting in a first direction. A second lower rod seat element is stacked on the first lower rod seat element and has a conical bottom surface abutting a top surface of the first lower rod seat element to facilitate pivoting in a second direction.
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