Posterior functionally dynamic stabilization system

Abstract

A functionally dynamic stabilization unit (10) and system for treatment of spinal instability are provided. Each unit, and collectively, the system, is configured to control flexion, extension and translation of the affected unstable vertebral area, thereby stabilizing the vertebral segments by restoring normal function. This is achieved by providing a unit and system that allow for lateral bending, axial compression, rotation, anterior segmental height adjustment, and posterior segmental height adjustment. The unit and system provide sufficient segmental stiffness, while also limiting, or controlling, the range of motion (i.e., sufficient stiffness in the neutral or active zone, while limiting or preventing motion outside of the active zone) to stabilize the vertebral segments. In use, the system mimics the natural movement of the normal spine. Furthermore, the system includes a rigid, fusion-promoting coupler (20) configured for use in an adjacent level, or as a substitute for the functionally dynamic unit. The modularity of the system allows adjustment over time and easier revision surgery, and is configured for minimally-invasive, delivery or implantation.

Description

[0001] This application is a divisional application of the Chinese patent application with the application number 200780045505.8. The filing date of the original application is December 7, 2007, and the name of the invention is "Dynamic Stabilization System for Back Road Function". [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 869,342, filed December 10, 2006, and U.S. Provisional Patent Application No. 60 / 914,360, filed April 27, 2007, both of which are incorporated in their entirety Included here as a reference. technical field [0003] The present invention relates to devices and methods for treating spinal disorders, and in particular to spinal stabilization systems for controlling or limiting relative motion between vertebrae. Background technique [0004] The spine includes a series of joints known as motion segment units. Each unit represents the smallest component of the spine that exhibits the kinematic behavior of the enti...

AI Technical Summary

Problems solved by technology

For example, fusion will result in permanent rigid fixation with irreversible / irreversible loss of range of motion at the vertebral level being fused

In addition, loss of motion at the level being fused allows stress to be transmitted to other adjacent motion segments, which can cause or accelerate degeneration of these segments

Also, fusion often fails to relieve some or all of the pain

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