Michielli, Michael Carl,Jones, Bryan S.,Hall, Mark,Cormier, Philip,Serhan, Hassan
申请号：
AU2011256194
公开号：
AU2011256194A1
申请日:
2011.05.18
申请国别(地区):
AU
年份:
2013
代理人:
摘要：
A bone anchor assembly includes a bone anchor, a receiver member for receiving a spinal fixation element to be coupled to the bone anchor, and a closure mechanism to fix the spinal fixation element with respect to the receiver member. The bone anchor includes a distal shaft having a distal threaded section and a proximal threaded section. The distal threaded section has a first pitch and a first number of thread starts and the proximal threaded section has a second pitch less than the first pitch and a second number of thread starts greater than the first number of thread starts. The distal threaded section and the proximal threaded section have a constant lead.
