Bi-radial pop-on cervical bone anchor
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United States of America Patent
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Sep 27, 2016
Grant Date -
Jul 9, 2015
app pub date -
Jan 7, 2015
filing date -
Jan 9, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cervical polyaxial bone anchor includes a longitudinal connecting member receiver structure and a cooperating shank. The shank has a body and an integral head with first and second spherical surfaces of different radii and a plurality of spaced curvate apertures for receiving portions of the longitudinal connecting member to result in a greater angle of inclination of the shank with respect to the receiver. The receiver has an upper channel and a lower cavity that further includes an expansion area and an operational seat for a split retainer ring that captures and fixes the shank head within the receiver.
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