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• W1966353263 abstract "Abstract In the present study, the effects of initial collagen fiber orientation on the medium‐term (up to 50 × 10 6 cycles) fatigue response of heart valve soft tissue biomaterials was investigated. Glutaraldehyde treated bovine pericardium (GLBP), preselected for uniform structure and collagen fiber orientation, was used as the representative heart valve biomaterial. Using specialized instrumentation, GLBP specimens were subjected to cyclic tensile loading to maximum stress levels of 500 ± 50 kPa at a frequency of 22 Hz. Two sample groups were examined, one with the preferred collagen fiber direction parallel (PD) and perpendicular (XD) to the direction of applied strain. The primary findings indicated that GLBP fatigue response was highly sensitive to the direction of loading with respect to fiber orientation. Specifically, when loading perpendicular to the preferred collagen fiber orientation, fiber reorientation is the dominant mechanism. In contrast, when loaded parallel to the preferred fiber direction a reduction in both collagen fiber crimp and fiber reorientation occurred. Moreover, alterations in the degree and direction of mechanical anisotropy can be inducted by cyclic loading when specimens are loaded perpendicular to the preferred fiber direction. Fourier Transform Infrared Spectroscopy (FT‐IR) results indicate that molecular‐level damage to collagen occurs in both groups after only 20 × 10 6 cycles. Taken as a whole, the results of this study suggest that initial collagen orientation plays a critical role in bioprosthetic heart valve biomaterial fatigue response. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res, 2007" @default.
• W1966353263 created "2016-06-24" @default.
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• W1966353263 date "2006-10-13" @default.
• W1966353263 modified "2023-10-17" @default.
• W1966353263 title "Effects of collagen fiber orientation on the response of biologically derived soft tissue biomaterials to cyclic loading" @default.
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• W1966353263 doi "https://doi.org/10.1002/jbm.a.30871" @default.
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