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Elastomeric intervertebral disc prosthesis

a technology of intervertebral discs and elastomeric cores, which is applied in the field of intervertebral disc prosthesis, can solve the problems of inability to achieve the effects of reducing stress between the elastomeric core and the rigid endplates, and reducing the risk of lateral bending

Inactive Publication Date: 2009-01-29
K2M
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an intervertebral disc prosthesis with rigid endplates and an elastomeric core. The elastomeric core is located between the endplates and attached to them. The elastomeric core has a sufficient compressive strength to support physiological axial loads. The elastomeric core is designed to reduce stress between the core and the endplates, making it less prone to failure in use. The prosthesis can be controlled in flexion-extension, lateral bending, and torsion. The elastomeric core has a minimum antero-posterior dimension in a horizontal plane located axially between the endplates, and the elastomer member has a durometer hardness sufficient to provide sufficient compressive strength to support physiological axial loads. The invention provides an intervertebral disc prosthesis that is more effective and reliable for replacing damaged spinal discs.

Problems solved by technology

Such degenerative disc disease (DDD) may become intractable to non-surgical treatment and have to be treated by surgical intervention.
Such deformation of the elastomeric component in repeated flexion may lead to eventual failure of the prosthesis.
However, even such a structure may be subject to eventual failure.

Method used

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  • Elastomeric intervertebral disc prosthesis
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  • Elastomeric intervertebral disc prosthesis

Examples

Experimental program
Comparison scheme
Effect test

example

[0053]This example illustrates the determination of a preferred ratio of anterior-posterior dimension to core height.

[0054]A series of experiments was conducted on a polycarbonate polyurethane disc of constant durometer (80 A). The ratio of the anterior-posterior width of the core to its height was varied, and the behavior of the disc as it was made to flex repeatedly to 10 degrees was examined. The results are shown below in Table 1.

TABLE 1Ratio of anterior-posterior dimension to core height1:12:13:14:1Effect ofBuckledNeutralSlightBulging and10° flexioninwardsbulgingimpingementof polymeron endplate

Test conditions:[0055]Elastomer hardness: 80 A durometer[0056]Disc height: 5 mm for all samples[0057]Anterior-posterior dimension varied to produce varied ratio of core height to anterior-posterior (AP) dimension

[0058]The results suggest that a ratio of 3:1 (anterior-posterior dimension to core height) or less is required to ensure that impingement of the core on the endplates does not oc...

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Abstract

An intervertebral disc prosthesis includes upper and lower rigid endplates and an elastomeric core structure located between the endplates and attached thereto, wherein the elastomeric core structure has a centroid positioned posterior to a centroid of at least one of the endplates.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a division of U.S. application Ser. No. 11 / 334,423 filed Jan. 19, 2006. This application also claims the benefit of U.S. Provisional Application No. 60 / 644,527, filed Jan. 19, 2005, the entire disclosure of which is incorporated herein by reference, and the benefit of U.S. Provisional Application No. 60 / 693,430, filed Jun. 24, 2005, the entire disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to intervertebral disc prostheses and more particularly to intervertebral disc prostheses having rigid endplates and an elastomeric core.[0004]2. Background Art[0005]Low back pain is a very common pathological condition, affecting approximately 80% of the general population at some time. Although most of patients experience the painful symptoms only occasionally and recover fully, approximately 10% of these patients come to experience chro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/44
CPCA61F2/0811A61F2310/00023A61F2/442A61F2002/30014A61F2002/30069A61F2002/30387A61F2002/30485A61F2002/30495A61F2002/305A61F2002/30563A61F2002/30574A61F2002/30604A61F2002/30616A61F2002/30971A61F2220/0025A61F2250/0018A61F2/3094A61F2/44
Inventor LEE, CASEY K.MAKRIS, GEORGECLEMOW, ALASTAIR J.T.
Owner K2M
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