| 摘要 |
A bone screw polyaxially connected to a seat, the seat including a top op ening, first and second rod receiving portions, first and second rod channel s. The system is implanted into a first vertebra. The first and second rods are Introduced to the seat through the top opening in a first orientation an d connected to the first and second rod receiving portions. The rods are cap able of polyaxial movement with respect to the seat for landing the opposite ends of the rods in adjacent seats of screw In other vertebrae. A closure m echanism is configured to lock the polyaxial motion of the rods with respect to the seat and to lock the polyaxial motion of the bone screw with respect to the seat simultaneously or independently. The seat is connectable to a c annula for delivering the first and second rods into the first seat in a per cutaneous, minimally invasive procedure.
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