| 摘要 |
An orthopedic bone fixation device (100) for stabilizing a plurality of bone segments includes a bone plate (110) and a screw assembly (120). The bone plate (110) includes a body defining at least one thru-bore (230), wherein the thru-bore (230) is defined to include a central cavity, the central cavity having a middle diameter (350), an entry diameter (330), and an exit diameter (340), the middle diameter (350) being larger than both the entry diameter (330) and the exit diameter (340). Further, the screw assembly (120) is configured to be coupled to the bone plate (110), wherein the screw assembly (120) includes a bone screw (220) having a head section (410), a thread section (400), and a central bore (440), an expandable ring (210) coupled to the head section (410), and a pin (200) at least partially disposed in the central bore (440), wherein the pin (200) includes a varying outer profile that engages the expandable ring (210) to vary an outer diameter (540) of the expandable ring (210) to lock the screw assembly (120) in the thru-bore (230).
|
