STRESS-DISTRIBUTION ON THE CUSPS OF A POLYURETHANE TRILEAFLET HEART-VALVE PROSTHESIS IN THE CLOSED POSITION
STRESS-DISTRIBUTION ON THE CUSPS OF A POLYURETHANE TRILEAFLET HEART-VALVE PROSTHESIS IN THE CLOSED POSITION
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DOI：
10.1016/0021-9290(91)90027-k
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发表时间：
1991-01-01
影响因子：
2.4
通讯作者：
HAN, G
中科院分区：
文献类型：
--
作者：
CHANDRAN, KB;KIM, SH;HAN, G
本文用有限元法分析了聚氨酯三叶人工心脏瓣膜在关闭位置时瓣尖的应力分布。 根据Ghista和Reul提出的关系（J. Biomechanics 10，313-324，1977）修改了瓣膜的几何形状。 分析了支架高度、瓣叶厚度和接合面积变化对应力分布的影响。 对三叶瓣膜的刚性和柔性支架进行了分析，以描述支架柔性对瓣叶应力分布的影响。 结果表明，应力集中区域存在于连合附件附近，与生物假体预测的区域相似。 通过增加刚性和柔性支架的支架高度，可降低瓣叶上的应力。 当考虑支架柔顺性时，选择性增加接合处附近的瓣叶厚度以及增加接合面积并不能降低瓣叶应力。 尚待研究高应力对聚氨酯瓣叶结构完整性的可能影响及其与钙化的关系。
In this paper, a finite element analysis of the stress distribution on the cusps of a polyurethane trileaflet heart valve prosthesis in the closed position is presented. The geometry of the valve was modified from a relationship proposed by Ghista and Reul (J. Biomechanics 10, 313-324, 1977). The effects of variations in stent height, leaflet thickness and coaptation area on the stress distribution were also analyzed. Analyses were performed with both rigid and flexible stents for the trileaflet valve in order to delineate the effect of stent flexibility on the leaflet stress distribution. The results showed that regions of stress concentration were present near the commissural attachment similar to those predicted with the bioprostheses. The stresses on the leaflets were reduced by increasing the stent height with both rigid and flexible stents. Selectively increasing the leaflet thickness near the commissures and also increasing the coaptation area did not prove to reduce the leaflet stresses when the stent flexibility was taken into account. The possible effect of high stresses on the structural integrity of polyurethane leaflets and its relationship with calcification is yet to be investigated.