Accelerated aging, natural aging, and small punch testing of gamma-air sterilized polycarbonate urethane acetabular components

作者：Kurtz S M^*; Siskey R; Reitman M

来源：Journal of Biomedical Materials Research Part B: Applied Biomaterials , 2010, 93B(2): 442-447.

DOI：10.1002/jbm.b.31601

• polycarbonate urethane
• PCU
• Bionate (R)
• FTIR
• ATR
• small punch testing
• degradation
• oxidation
• aging
• accelerated aging

The objectives of this study were three-fold (1) to determine the applicability of the small punch test to characterize Bionate (R) 80A polycarbonate urethane (PCU) acetabular implants, (2) to evaluate the susceptibility of PCU acetabular implants to exhibit degradation of mechanical behavior following gamma irradiation in air and accelerated aging, and (3) to compare the oxidation of gamma-air sterilized PCU following accelerated aging and 5 years of natural shelf aging In addition to attenuated total reflectance-Fourier transform infrared spectroscopy, we also adapted a miniature specimen mechanical test, the small punch test, for the deformable PCU cups Accelerated aging was performed using ASTM F2003, a standard test that represents a severe oxidative challenge The results of this study suggest that the small punch test is sufficiently sensitive and reproducible to discriminate slight differences in the large-deformation mechanical behavior of Bionate 80A following accelerated aging The gamma-air sterilized PCU had a reduction of 9% in ultimate load after aging Five years of shelf aging had little effect on the mechanical properties of the PCU Overall, our findings suggest that the Bionate 80A material has greater oxidative stability than ultra-high

• 出版日期2010-5