System and method for polyaxially adjustable bone anchorage
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United States of America Patent
Stats
-
Dec 27, 2011
Grant Date -
Dec 18, 2008
app pub date -
Jun 12, 2008
filing date -
Jun 15, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An implantable bone anchor assembly for fixing an elongated member such as a spinal rod may include a bone anchor, a coupling head configured to receive the bone anchor and the elongated member, and a locking mechanism. The locking mechanism may provide compressive force to simultaneously fix the position of the elongated member and lock out polyaxial rotation of the bone anchor relative to the coupling head. The locking mechanism may include an engagement member with an oblique surface configured to slide along an oblique surface of the coupling head into engagement with the elongated member. The bone anchor may comprise a head portion and a threaded portion which may be coupled with the coupling head and joined together during manufacture. The assembly may further include a pin and/or a collar to retain the bone anchor. The bone anchor may be side-loaded into the coupling head.
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