Patent ID: 9055979
Filing Date: 2015-06-16
Classification: A61B,D07B

Abstract:
1. A dynamic stabilization system for stabilizing a vertebral segment of a spine, the system comprising: a first vertebral anchor configured to be secured to a first vertebra; a second vertebral anchor configured to be secured to a second vertebra; a cord extendable from the first vertebral anchor to the second vertebral anchor, the cord having a variable stiffness through a range of displacement; and a spacer surrounding a portion of the cord; wherein: the stiffness of the cord increases as an applied tensile force on the cord is increased; the cord has a first phase of stiffness through a first range of displacement, a second phase of stiffness through a second range of displacement, and a third phase of stiffness through a third range of displacement; and the stiffness in the cord in the first phase is less than the stiffness in the cord in the third phase, and the stiffness of the cord in the second phase progressively increases from the stiffness in the cord in the first phase to the stiffness in the cord in the third phase.