Polyaxial pedicle screw
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United States of America Patent
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May 2, 2017
Issued Date -
N/A
app pub date -
Oct 27, 2015
filing date -
Aug 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A polyaxial bone anchor including a housing, a bone screw, and a retainer for pivotably coupling the head of the bone screw to the housing. The retainer is positioned into the bore of the housing and includes a plurality of alternating tabs and slots circumferentially arranged to define a cavity for receiving the head portion of the bone screw therein. The retainer is axially moveable in the housing from a first position in which the head portion is not passable through the lower opening of the retainer to a second position in which the head portion is passable through the lower opening of the retainer.
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