Patent ID: 8986356
Filing Date: 2015-03-24
Classification: A61B

Abstract:
1. A uniplanar bone anchor system for a fixation procedure comprising: a bone fastener including a head and a shaft adapted to engage an anatomy, the head having at least one first bearing surface; a saddle having a proximal end and a distal end, the distal end including a first bore formed about the longitudinal axis that receives the head of the bone fastener; a coupling system including a cap and at least one annular support, the cap defining at least one second bearing surface configured to allow the bone fastener to move in one plane relative to the saddle, the at least one annular support coupled to the head of the bone fastener to retain the bone fastener within the first bore; and wherein the cap is received within the first bore such that the at least one second bearing surface of the cap contacts the at least one first bearing surface of the head to permit the bone fastener to move relative to the saddle in the one plane; and the head defines a slot that extends through a portion of the first bearing surface, and the cap includes at least one triangular projection that is received into the slot to restrict the movement of the bone fastener to the one plane.