Evaluation of materials for artificial heart valves |
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Authors: | G S Bhuvaneshwar C V Muraleedharan A V Ramani M S Valiathan |
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Affiliation: | (1) Sree Chitra Tirunal Institute for Medical Sciences and Technology, Biomedical Technology Wing, 695 012 Poojapura, Trivandrum, India |
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Abstract: | The heart of a normal human being beats about 38 million cycles every year. An artificial heart valve, to perform at this
rate in the adverse conditions inside the heart for 20 years or more, should be highly wear-resistant with excellent fatigue
strength. Thus, the study of mechanical and physical properties of the materials intended for use in artificial valves becomes
an inseparable part of the valve development process itself. The physical and mechanical requirements of the materials used
in the Chitra heart valve have been evaluated by studying their water absorption, adhesive wear and abrasive properties. The
mechanical durability of the device has been assessed by accelerated life cycle testing. The test systems developed for the
above are described here. The results show UHMW-PE to be a highly wear-resistant material suitable for the occluder. The accelerated
wear tests show that the valve with Haynes-25 alloy cage and UHMW-PE disc has durability in excess of 50 years. |
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Keywords: | Prosthetic heart valve abrasive wear adhesive wear accelerated life cycle testing |
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