Bone anchor with offset rod connector

摘要

This disclosure describes example an surgical fixation anchor and methods for implanting the surgical fixation anchor on the spine as part of a spinal fixation construct. The surgical fixation anchor can be coupled to a spinal rod. The coupling between the spinal rod and the anchor can be offset from an axis of the anchor. The position and orientation of the coupling to the spinal rod can also be transnationally and rotationally adjusted relative to the anchor to facilitate the coupling and/or to optimize space usage adjacent to the fixation construct.

主权项

1. A spinal anchor, comprising:
a shank having a threaded region for anchoring in bone, and a spherical head; and an offset connector for coupling the shank to a spinal rod offset from an axis of the shank, wherein the offset connector comprises:
a base, the base having a first end with a receptacle for forming a first lockable polyaxial joint with the spherical head of the shank, the base further including an arm that extends from the receptacle, the arm having a first length, a first height, and a first width; anda tulip, the tulip forming a second lockable polyaxial joint translatable along a length of the base and having a rod channel for coupling the tulip to a spinal rod, the tulip further including a passage, the passage having a second length less than the first length, a second height greater than the first height, and a second width greater than the first width, the arm of the base extending through the passage such that the arm can rotate relative to the tulip while extending through the passage, the arm also extending through a compressible member situated within the passage, the compressible member comprising the second polyaxial joint.