Spinal stabilization devices and systems

摘要

Spine stabilization devices, systems and methods are provided in which a single resilient member or spring (230) is disposed on an elongate element (250) that spans two attachment members (260, 266) attached to different spinal vertebrae. The elongate element passes through at least one of the two attachment members, permitting relative motion therebetween, and terminates in a stop or abutment (256). A second resilient member (232) is disposed on the elongate element on an opposite side of the sliding attachment member, e.g., in an overhanging orientation. The two resilient members are capable of applying mutually opposing urging forces, and a compressive preload can be applied to one or both of the resilient members. In addition, spine stabilization devices, systems and methods are provided in which a torsion member extends between first and second stabilization devices that are oppositely positioned relative to the vertebrae.