| 摘要 |
<p>A bottom-loading multi-axial bone anchor apparatus is disclosed. The apparatus includes a receiver member (30), a crown member (70), a bone anchor (50) and a retaining member (90). The receiver member (30) defines an upper opening (31a) and a lower opening (31b), which may form part of the same opening (32), a channel (45), and a grove (41). The crown member (70) and bone anchor (50) are loaded into the lower opening (31b) of the receiver member (30), and the retaining member (90) fits around the bone anchor (50) and into the groove (41) in the receiver member (30). The bone anchor (50) is capable of multi-axial positioning with respect to the receiver member (30). An elongated member (R) is placed in the channel (45) of the receiver member (30), contacting the crown member (70), and a compression member (120) is applied via the upper opening (31a). The compression member (120) presses down on the elongated member (R), which presses down on the crown member (70) and locks the bone anchor (50) between the crown member (70) and the retaining member (30).</p> |
