| 摘要 |
An orthopedic device (100) includes an implant member (110) with a thru-bore (230) having an entry diameter (330), an intermediate diameter (350), and an exit diameter (340). According to one embodiment the intermediate diameter (350) of the thru-bore (230) is larger than both the entry diameter (330) and the exit diameter (340). Additionally, the orthopedic device (100) includes a screw assembly (120) configured to be coupled to the thru-bore (230), including a thread portion (400) and a selectively expandable head portion (410). The selectively expandable head portion (410) includes both an expandable ring (210) and a pull-lock pin (200) configured to selectively expand the expandable ring (210) as the pull-lock pin (200) is pulled from said screw assembly (120). |
