| 摘要 |
Devices are disclosed for occluding defects in an annulus fibrosis to prevent conditions such as disc herniation and recurrent disc herniation. The preferred embodiments comprise an intradiscal component having a width greater than the width of the defect and a height less than the intervertebral spacing, and an extradiscal component physically coupled to the intradiscal component, the extradiscal component having a height greater than the intervertebral spacing. The components most preferably each comprise two outwardly extending arms, of equal or unequal length, oriented transversely with respect to one another. The arms of the extradiscal component are preferably of sufficient length to overlap at least a respective portion of the adjacent vertebrae. The invention further anticipates a body disposed between the intradiscal and extradiscal components to at least partially consume the defect. The body is composed of a natural or synthetic biocompatible material, such as a resilient or compressible natural or synthetic rubber, allograft tendon, or other suitable substances. A barrier element, such as a mesh or compressible layer, or strengthening member, may further be disposed between the intradiscal component and the inner surface of the annulus fibrosis. Optionally as well, a biasing element such as a spring or tensioning cable may be inserted between the intradiscal and extradiscal components to urge them toward one another. With respect to disclosed methods, one or both of the intradiscal and extradiscal components may articulate or otherwise temporarily compact to facilitate a compressed introduction into the intradiscal space.
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