夹层动脉瘤及覆膜支架模型的流固耦合分析

腹主动脉瘤腹主动脉瘤(Abdominal Aortic Aneurysm,AAA)是危及病人生命的严重疾病,若主动脉瘤不加以治疗,瘤腔将不断长大而有破裂的危险,尽管目前对主动脉瘤的研究较多,但对主动脉夹层动脉瘤(Aortic Dissecting Aneruysm,ADA)的研究较少,本文在周期性脉动速度和压力条件下,对DNA内部流场及植入覆膜支架进行了流固耦合的数值模拟.得到了夹层动脉瘤内部流场的速度矢量分布,瘤壁上的位移、应力分布.同时对夹层动脉瘤植入覆膜支架前后进行了对比分析,覆膜支架的植入使得瘤壁上的最大应力和最大位移均从瘤腔壁面转移到管状动脉壁上,且数值大大下降,说明植入覆膜支架能很好的防止夹层动脉瘤破裂.

Blood Flow and Structure Interactions in a Stented Aortic Dissecting Aneurysm Model

Abdominal Aortic Aneurysm(AAA) is a serious arterial disease.If an aneurysm grows without treatment,the bulge will become bigger and bigger until it ruptures eventually.Although many researchers have done the work about AAA,few literatures about ADA are reported.Computer simulation was used to investigate the blood flow and structure interactions in a stented Aortic Dissecting Aneurysm(ADA),which endures the periodic pulse velocity and pressure.We obtained and analyzed the flow velocity distribution,the wall displacement and wall stress in the ADA.By comparing the different results between a non-stented and a stented ADA,we found that the insertion of a vascular graft can make the location of maximum stress and displacement move from the aneurysm lumen wall to the artery wall,accompanied by the greatly decreased value.It is shown that the insertion of a vascular graft has the potential to significantly prevent the Dissecting Aneurysm rupture.