| 主权项 |
1. A pedicle screw for spinal fixation comprising:
a bone fastener portion, wherein the bone fastener portion is at least partially threaded; a permanent rod coupling comprising: a bottom surface connected to the bone fastener portion, a middle section positioned between the bottom surface and a top surface, a lateral rod opening in a portion of the middle section adapted to receive a permanent rod, a threaded bore that extends from the top surface into the lateral rod opening, a permanent rod fastener mated to fit the threaded bore to extend into the lateral rod opening, wherein the permanent rod fastener can engage a permanent rod positioned in the lateral rod opening, and a transition region on a portion of the top surface; a breakaway portion in the transition region; a temporary rod coupling connected to the transition region, wherein the temporary rod coupling comprises a temporary rod channel adapted to receive a temporary rod, an upper threaded opening that extends into the temporary rod channel, and an upper rod fastener mated to the upper threaded opening, wherein the upper rod fastener can engage the temporary rod positioned in the temporary rod channel; wherein the permanent rod is positioned in the lateral rod opening and secured by the permanent rod fastener, wherein the permanent rod can be inserted into the lateral rod opening along a direction which is transverse to a longitudinal axis of the permanent rod and transverse to a longitudinal axis of the bone fastener portion, and the temporary rod is temporarily positioned in the temporary rod channel and secured by the upper rod fastener and when the temporary rod is not needed the temporary rod coupling can be removed at the transition region by separation at the breakaway portion to leave the top surface. |
