首页> 外文期刊>Acta biomaterialia >The anti-calcification potential of a silsesquioxane nanocomposite polymer under in vitro conditions: potential material for synthetic leaflet heart valve.
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The anti-calcification potential of a silsesquioxane nanocomposite polymer under in vitro conditions: potential material for synthetic leaflet heart valve.

机译:倍半硅氧烷纳米复合聚合物在体外条件下的抗钙化潜力:合成小叶心脏瓣膜的潜在材料。

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摘要

Calcification currently represents a major cause of failure of biological tissue heart valves. It is a complex phenomenon influenced by a number of biochemical and mechanical factors. Recent advances in material science offer new polymers with improved properties, potentially suitable for synthetic leaflets heart valves manufacturing. In this study, the calcification-resistance efficacy and mechanical and surface properties of a new nanocomposite polymeric material (polyhedral oligomeric silsesquioxane-poly(carbonate-urea)urethane; POSS-PCU) which has been developed by our group are assessed by means of in vitro testing. In particular, thin sheets of nanocomposite, glutaraldehyde-fixed bovine pericardium (BP) and polyurethane (PU) were exposed to a calcium solution into a specially designed in vitro accelerated physiological pulsatile pressure system for a period of 31days and a total of 4x10(7) cycles. The samples were investigated for signs of calcification after exposure to calcium solution by means of X-ray, microscopic and chemical inspections. Mechanical and surface properties were also studied using stress-strain behaviour and surface morphology and hydrophobicity. Comparison shows that, in the experimental conditions, the level of calcification for the nanocomposite is considerably lower than for the fixed BP (p=0.008) and PU samples (p=0.015). Also, mechanical properties were unchanged in POSS-PCU, while there was a significant deterioration in PU samples (p<0.05). Hydrophobicity was significantly reduced in both the POSS-PCU and PU samples (p<0.0001). However, the POSS-PCU nanocomposite remained more hydrophobic than the PU sample (p<0.0001). Less platelet adhered to the POSS-PCU compared to the PU (p<0.0001). These results indicate that the use of this nanocomposite in synthetic leaflets heart valves may lead to potential advantages in terms of long-term performances and durability.
机译:钙化目前代表生物组织心脏瓣膜衰竭的主要原因。这是受许多生物化学和机械因素影响的复杂现象。材料科学的最新进展提供了具有改进性能的新型聚合物,潜在地适合于合成小叶心脏瓣膜的制造。在这项研究中,我们小组开发的一种新型纳米复合聚合物材料(多面体低聚倍半硅氧烷-聚(碳酸酯-脲)聚氨酯; POSS-PCU)的耐钙化功效以及机械和表面性能均通过体外测试。特别是,将纳米复合材料,戊二醛固定的牛心包(BP)和聚氨酯(PU)的薄片暴露于钙溶液中,并经过专门设计的体外加速生理脉动压力系统持续31天,总共4x10(7) )个周期。通过X射线,显微镜和化学检查,对样品接触钙溶液后的钙化迹象进行了研究。还使用应力-应变行为以及表面形态和疏水性研究了机械和表面性能。比较表明,在实验条件下,纳米复合材料的钙化水平明显低于固定BP(p = 0.008)和PU样品(p = 0.015)。另外,POSS-PCU中的机械性能没有变化,而PU样品则有明显的劣化(p <0.05)。在POSS-PCU和PU样品中,疏水性均显着降低(p <0.0001)。但是,POSS-PCU纳米复合材料比PU样品疏水性更高(p <0.0001)。与PU相比,附着在POSS-PCU上的血小板更少(p <0.0001)。这些结果表明在合成小叶心脏瓣膜中使用这种纳米复合材料可能会带来长期性能和耐用性方面的潜在优势。

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