| 摘要 |
A system for introducing an elongated spinal rod comprising a bone fastener having a head (24), the head including a top end (12), a bottom end (13), and a pair of side walls (26, 28) connected at the bottom end defining an elongated U-shaped channel (22) having a first longitudinal axis (23) and a top opening (14) located at the top end. The top opening and the channel further define a passageway (11) configured for receiving the spinal rod (15) and each side wall further defining a first end face (30, 32) and a second end face (34, 36), the second end face opposite the first end face. A bone engaging element (21) extends from the bottom end of the head for anchoring the bone fastener to the bone. The system further comprises a tool (50) for introducing the rod into the U-shaped channel.
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