Roger P. Jackson,James L. Surber,Nathaniel D. Ginzton
申请号：
US16686122
公开号：
US20200155202A1
申请日:
2019.11.16
申请国别(地区):
US
年份:
2020
代理人:
摘要：
A pivotal bone anchor assembly for securing an elongate rod to patient bone includes a shank having a head and an anchor portion, a receiver having an axial bore and a channel for receiving the elongate rod, a collet insert top loaded into a first position within the axial bore and having a collet pocket for receiving the shank head, and a pressure ring uploadable into the collet pocket prior to the shank head and having an upper surface for engaging the rod. After receiving the shank head within the collet pocket, the collet insert and pressure ring are downwardly deployable with the shank head into a second position to capture the shank head in the assembly, the pressure ring being operable to transfer pressure from the elongate rod in the channel to the shank head to lock an angular position of the shank relative to the receiver.
