Polyaxial bone screw
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United States of America Patent
Stats
-
Oct 11, 2011
Grant Date -
Sep 10, 2009
app pub date -
Apr 6, 2009
filing date -
Nov 3, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A polyaxial bone screw assembly includes a threaded shank body having an upper capture structure, a head, a retaining ring and a nut. The external capture structure surface includes a threaded portion and a smooth portion; the smooth portion for slidably mating with the retaining ring and the threaded portion for rotatable attachment to the nut within a cavity of the head. The nut fixes the retaining ring to the shank and also provides a tool engagement formation for driving the shank body into bone.
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Cited Art Landscape
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