| 主权项 |
1. A bone fastener having a longitudinal axis and being configured to penetrate into boney tissue and connect with a rod, comprising:
a fixation portion comprising a threaded shaft configured to interface with the boney tissue; a connection portion comprising a concave cavity extending transverse to the longitudinal axis configured to interface with the rod; a flexible portion disposed between the fixation portion and the connection portion such that the fixation portion and the flexible portion are coaxial, the flexible portion being configured to permit flexure of the connection portion relative to the fixation portion, the flexible portion having a first set of opposed facing surfaces that mechanically limit a range of flexure in a first direction, and having a second set of opposed facing surfaces that mechanically limit the range of flexure in a second direction, wherein the first and second sets of opposed facing surfaces are transverse to the longitudinal axis, and the flexible portion has a maximum width extending transverse to the longitudinal axis that is greater than a maximum width of the fixation portion extending transverse to the longitudinal axis and a maximum width of the connection portion extending transverse to the longitudinal axis; and an arcuate connecting portion extending between upper and lower portions of the flexible portion, the upper portion merging with the connection portion such that the upper portion extends away from the connection portion in a direction that faces away from the longitudinal axis and the lower portion merging with the fixation portion such that the lower portion extends away from the fixation portion in a direction that faces away from the longitudinal axis. |
