Spinal Stabilization

摘要

Spinal stabilization systems are disclosed having spanning portions extending between and securable to pedicle screw assemblies, the spanning portions have stiffness characteristics that may be variable or selectively adjustable, and/or have non-linear behavior with respect to force versus distortion. Additionally, the systems may utilize a plurality of spanning portions in which two or more of the spanning portions have different stiffness characteristics.

主权项

1. A spinal stabilization system securable with a plurality of vertebrae, the system comprising:
at least one anchor for each of at least two vertebrae; and a spanning structure adapted to extend between and be securable with the anchors, wherein the spanning structure has an adjustable mechanical performance characteristic, wherein the mechanical performance characteristic is a compression/expansion stiffness, wherein the spanning structure includes a piston assembly compressible and expandable along a longitudinal axis thereof, and wherein the piston assembly is provided with a fluid and a damper.