Bottom-loading polyaxial bone anchoring system
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United States of America Patent
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Aug 22, 2017
Grant Date -
Jun 30, 2016
app pub date -
May 2, 2014
filing date -
May 2, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A polyaxial bone anchoring system comprises a bone anchoring member provided with a hemispherical head and a tubular barrel comprising a base traversed by an axial channel of which the cross-section is greater than the cross-section of the hemispherical head, the channel having, in the lower part, a frustoconical housing that widens in the direction opposite the hemispherical head and, upstream from the frustoconical housing, a transverse shoulder of which the inner cross-section is substantially equal to the cross-section of the hemispherical head, the system further comprising a conical split ring of which the outer surface matches the inner surface of the frustoconical housing and of which the minimum cross-section when idle is smaller than the nominal cross-section of the hemispherical head, said ring being made from a deformable material.
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