Bone anchoring device and tool cooperating with such a bone anchoring device
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United States of America Patent
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Jun 20, 2017
Issued Date -
N/A
app pub date -
Sep 3, 2015
filing date -
Sep 30, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A bone anchoring device includes a receiving part including a rod receiving portion with a first end, a second end, and a U-shaped recess for receiving a rod, the recess defining two free legs, and a head receiving portion at the second end for introducing and clamping the head, and a locking ring configured to be arranged around the head receiving portion, the locking ring including an engagement structure for engagement with a tool, the engagement structure defining a width of the locking ring that is greater than a greatest width of the rod receiving portion, wherein the locking ring can assume a locking position exerting a greatest compressive force on the head receiving portion of the receiving part to lock an inserted head, and wherein the locking ring is movable out of the locking position towards the first end of the rod receiving portion.
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