摘要
目的观察数值模拟技术预测不同植入策略下自膨式人工瓣膜(SEV)支架治疗0型二叶主动脉瓣(BAV)狭窄的效果。方法基于1例0型BAV狭窄伴不对称钙化患者CT血管成像数据重建主动脉根部管壁、主动脉瓣钙化、原生瓣膜及SEV三维模型,采用ABAQUS/Explicit显式动力学分析模块观察不同植入策略下[植入深度(高、中、低位)+植入中心(中心、偏心位)]SEV与主动脉根部间的相互作用,即根部应力及支架形变。结果低位、中心位植入时,SEV支架对主动脉根部管壁的范式等效(Von Mises)应力最大,平均值及最大值分别为2.28及45.30 kPa;中位、中心位植入时,S1~S12平面支架椭圆率平均值最高(0.254);高位、偏心位植入时,S1~S3平面支架椭圆率平均值最小(0.124)。结论不同SEV支架植入策略下支架与主动脉根部的相互作用存在一定差异;采用数值模拟技术根据0型BAV钙化大小及位置确定SEV植入中心及植入深度有助于降低主动脉瓣环破裂风险、提高支架耐用性及改善预后。
Objective To observe the effect of numerical simulation technique for predicting effect of self-expanding prosthetic valve(SEV)stents for treating type 0 bicuspid aortic valve(BAV)stenosis with different implantation strategies.Methods Based on CT angiography data from a patient with type 0 BAV stenosis and asymmetric calcification,three-dimensional models of aortic root wall,aortic valve calcification,native valve and SEV were reconstructed.ABAQUS/Explicit dynamic analysis module was used to observe the interaction between SEV stents and aortic root including root stress and stent deformation under different implantation strategies(implantation depths of high,medium or low,and implantation centers of central or eccentric position).Results When SEV was implanted centrally at low depth and central position,the Von Mises stress on aortic root wall was the highest,with mean and peak value of 2.28 and 45.30 kPa,respectively.When SEV was implanted at medium depth and central position,the average eccentricity of stent across all planes was the highest(0.254),while when implanted at high depth and eccentric position,the average ellipticity in planes S1—S3 was the minimal(0.124).Conclusion Different SEV implantation strategies resulted in varying interactions between stent and aortic root.Numerical simulation technique could be used to determine the implantation center and depth based on the size and location of type 0 BAV calcification,which was helpful to reducing rupture risk of aortic annulus,increasing durability and improving prognosis of SEV stent.
作者
杜佳辰
徐洪涛
韩庆奇
崔国民
DU Jiachen;XU Hongtao;HAN Qingqi;CUI Guomin(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Cardiovascular Surgery,the First Affiliated Hospital of Navy Medical University,Shanghai 200433,China)
出处
《中国医学影像技术》
北大核心
2025年第1期133-137,共5页
Chinese Journal of Medical Imaging Technology
基金
国家自然科学基金(12375341)。
关键词
二叶主动脉瓣
有限元分析
支架
bicuspid aortic valve
finite element analysis
stents
