Device and method for the prevention of multi-level vertebral extension

Abstract

Methods and devices are adapted to limit the extent of vertebral extension between an upper-most vertebral bone and a lower-most vertebral bone wherein a least one additional vertebral bone resides between them. In an embodiment, the limitation of extension occurs while flexion is at least partially maintained within at least one FSU. In other embodiments, flexion may be abolished.

1 .- 2 . (canceled) 
     
     
         3 . An apparatus configured to limit an extent of vertebral extension between an upper-most vertebral bone and a lower-most vertebral bone of a spinal segment comprising three or more vertebrae, the apparatus comprising:
 a first portion configured to affix to an intermediate vertebral bone of the spinal segment;   a first member configured to abut an upper aspect of a superior articulating process of the lower-most vertebral bone of the spinal segment; and   a second member configured to abut a lower aspect of an inferior articulating process of the upper-most vertebral bone of the spinal segment;   wherein the abutment of the first member limits travel of the superior articulating process of the lower-most vertebral bone towards the inferior articulating process of the upper-most vertebral bone during vertebral extension.   
     
     
         4 . The apparatus of  claim 3 , wherein said spinal segment comprises at least one functional spinal unit (FSU), and flexion therein is at least partially maintained therein. 
     
     
         5 . The apparatus of  claim 3 , wherein said spinal segment comprises at least one functional spinal unit (FSU), and flexion therein is eliminated.