Indentation hardness: A simple test that correlates with the dissipated-energy predictor for fatigue-life in bovine pericardium membranes for bioprosthetic heart valves
| Autor: | Isabel Millán, Eduardo Jorge Herrero, Francisco J. Rojo, Almudena Tobaruela, Lourdes Alvarez, A. Cordón, Gustavo V. Guinea, Jean Yves Bourges, José María García Páez |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Bovine pericardium 0206 medical engineering Biomedical Engineering 02 engineering and technology Indentation hardness Biomaterials Stress (mechanics) Hardness medicine Pericardium Shore durometer Animals Composite material Bioprosthesis Test procedures Dissipation 021001 nanoscience & nanotechnology 020601 biomedical engineering Durability Heart Valves Equipment Failure Analysis medicine.anatomical_structure Mechanics of Materials Heart Valve Prosthesis Cattle 0210 nano-technology Biomedical engineering |
| Zdroj: | Journal of the mechanical behavior of biomedical materials. 61 |
| ISSN: | 1878-0180 |
| Popis: | The aim of this study was to evaluate the variation of hardness with fatigue in calf pericardium, a biomaterial commonly used in bioprosthetic heart valves, and its relationship with the energy dissipated during the first fatigue cycle that has been shown to be a predictor of fatigue-life (Garcia Paez et al., 2006, 2007; Rojo et al., 2010). Fatigue tests were performed in vitro on 24 pericardium specimens cut in a root-to-apex direction. The specimens were subjected to a maximum stress of 1MPa in blocks of 10, 25, 50, 100, 250, 500, 1000 and 1500 cycles. By means of a modified Shore A hardness test procedure, the hardness of the specimen was measured before and after fatigue tests. Results showed a significant correlation of such hardness with fatigue performance and with the energy dissipated in the first cycle of fatigue, a predictor of pericardium durability. The study showed indentation hardness as a simple and reliable indicator of mechanical performance, one which could be easily implemented in improving tissue selection. |
| Databáze: | OpenAIRE |
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