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PIVOTAL BONE ANCHOR WITH COLLET RETAINER AND INNER LOCKING INSERT
专利权人:
Roger P. Jackson
发明人:
Roger P. Jackson,James L. Surber
申请号:
US16363041
公开号:
US20190216510A1
申请日:
2019.03.25
申请国别(地区):
US
年份:
2019
代理人:
摘要:
A cervical polyaxial bone anchor includes a shank having an integral spherical head and a receiver having an upper channel for receiving a rod and a lower seat near a lower opening for receiving a closed retainer that includes a compressible upper portion engaged with the receiver seat and an expandable lower portion capturing the shank head. An outer sleeve slidable with the receiver prohibits expansion of the retainer lower portion during operation. A compression insert engages the retainer upper portion and is in friction fit with the shank head prior to fixing of an angle of the shank with respect to the receiver.
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