Dynamic spinal stabilization system

Inactive Publication Date: 2005-06-30
SPINEWAVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0012] In response to these limitations of the prior art, the present invention contemplates a dynamic stabilization system that relies upon flexible elements interposed between a bone anchor, such as a bone screw or spinal hook and a stabilization membe

Problems solved by technology

However, spinal fusion has been recognized to have limitations in the treatment of disc degeneration, especially in the earlier stages of the degeneration where it may be unnecessary to eliminate motion of the spinal motion segments.
Consequently, many of these systems are susceptible to over-loading the disc annulus or are, by necessity, unduly restrictive with respect to motion of the spinal segment.
Moreover, these prior sys

Method used

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Embodiment Construction

[0033] For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and described in the following written specification. It is understood that no limitation to the scope of the invention is thereby intended. It is further understood that the present invention includes any alterations and modifications to the illustrated embodiments and includes further applications of the principles of the invention as would normally occur to one skilled in the art to which this invention pertains.

[0034] An exemplary spinal construct is depicted in FIG. 1. In this construct, a scaffolding is affixed to opposite sides of the spine. In the illustrated configuration, a pair of stabilization elements, in the form of spinal rods R, span from the L3 vertebra, across the L4 and L5 vertebrae and ending at the sacrum S. A series of connectors C1-C4 fasten the rod R to the vertebrae. The connectors in a typical s...

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Abstract

A dynamic stabilization system includes a stabilization element, such as a spinal rod, a plurality of bone anchors, such as bone bolts, and a like plurality of connectors for connecting the bolts to the spinal rod. At least some of the connectors include a flexible element between the bone anchor and the rod and an adjustment element for adjusting the flexibility of the flexible element, to thereby adjust the dynamic flexibility between the rod and the bone anchor. In one embodiment, the flexible element is a flexible bearing element of a rod end bearing.

Description

[0001] The present invention relates to spinal implant systems, and particularly to systems for stabilization of the spine. The invention provides a dynamic stabilization system that permits limited relative movement between the instrumented vertebrae and the stabilization system. [0002] In the past, the principal protocol for the treatment of the spine has been rigid fixation combined with fusion of the affected vertebral body or intervertebral disc. Arthrodesis, as this approach is known, has been achieved with a variety of rigid fixation elements, such as spinal rods or plates that are rigidly fixed to a vertebra using bone screws, bone bolts and spinal hooks. However, spinal fusion has been recognized to have limitations in the treatment of disc degeneration, especially in the earlier stages of the degeneration where it may be unnecessary to eliminate motion of the spinal motion segments. [0003] Clinical studies suggest that cells of the intervertebral disc respond favorably to ...

Claims

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Application Information

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IPC IPC(8): A61B17/70
CPCA61B17/701A61B17/7007
Inventor PAFFORD, JOHNWILSON, THOMASBOYD, LAWRENCE M.LOGUIDICE, MARK D.
Owner SPINEWAVE
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