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  3. AOX™ Antioxidant Polyethylene

AOX™ Antioxidant Polyethylene

AOX™ Antioxidant Polyethylene

AOX™ Polyethylene features a patented antioxidant, COVERNOX™ Antioxidant, which combines with post irradiation free radicals to stabilize them. Once implanted, the COVERNOX™ Antioxidant which has bonded with free radicals, designed to prevent oxidation to potentially maintain mechanical integrity and oxidative stability.

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Instructions for Use

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Features & Benefits

Oxidative Stability

The polyethylene resin is blended with an antioxidant (COVERNOX Antioxidant). The antioxidant stabilizes free radicals preventing them from oxidizing.

Wear Resistance

The polyethylene resin/COVERNOX Antioxidant mix is exposed to a level of irradiation (8 Mrads) to stimulate a moderate amount of cross-linking while delivering optimum wear characteristics without compromising mechanical integrity.

Mechanical integrity

AOX Polyethylene maintains high material strength and toughness characteristics by utilizing GUR 1020 resin, with its better inherent mechanical properties, than GUR 1050.1 The addition of an antioxidant into the material eliminates the need for re-melting or annealing, and therefore it maintains excellent mechanical properties.2

Supporting Documentation

Resources
Resources

Resources

  •  AOX™ Antioxidant Polyethylene Design Rationale
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References

  1. ASTM Standard Specification for Ultra-High-Molecular-Weight Polyethylene Powder and Fabricated Form for Surgical Implants, Data on file. WR080405
  2. Kurtz, S. M., Advances in the processing, sterilization, and crosslinking of ultra-high molecular weight polyethylene for total joint arthroplasty. Biomaterials Handbook, 2nd ed. 1999. p. 1659-1688

Indications for Use

Total knee arthroplasty is intended to provide increased patient mobility and reduced pain by replacing the damaged knee joint articulation in patients where there is evidence of sufficient sound bone to seat and support the components. Total knee replacement may be considered for younger patients if, in the opinion of the surgeon, an unequivocal indication for total knee replacement outweighs the risks associated with the age of the patient, and if limited demands regarding activity and knee joint loading can be assured.

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