心室辅助泵-罗叶血泵流场的数值模拟  

Numerical simulation of the flow field of a ventricular assist pump （Luo-Ye pump ）

作　　者：肖学钧[1] 杜松林[2] 吴岳恒[3] 岑人经[4] 邱霖[4] 林蒋国[4] 成安衡[1] 

机构地区：[1]广州广东省人民医院广东省心血管病研究所心外科,510100 [2]南方医科大学附属南方医院胸心外科 [3]广东省人民医院广东省医学科学院医学研究中心 [4]华南理工大学生物力学研究所

出　　处：《中华生物医学工程杂志》2010年第4期284-287,共4页Chinese Journal of Biomedical Engineering

基　　金：基金项目：国家“十五”科技攻关计划基金（2001BA706806）;广东省医学科研基金（B2007004）;广东省教育部产学研项目基金（20088090500210）

摘　　要：目的研究心室辅助泵-罗叶血泵（L-Y泵）的流场，并与BerlinHeart血泵（B-H泵）进行比较。方法本研究运用计算流体力学（CFD）的方法，研究L—Y泵（80ml）和B—H泵（80ml）的流场，并从两种血泵的流线图和压力分布图中选择典型截面进行比较分析。结果流线图显示，舒张早期，L—Y泵内流体呈现切线，舒张中期以高度连续流线状顺序在泵体内旋转形成旋涡；B—H泵在舒张早期泵内流体也呈切线状，但舒张中期末见旋涡形成。收缩期，两血泵内血流均以射流形式流出，由于L—Y泵的交叉设计特点，L-Y泵的流线分布较均匀；而B—H泵出人口呈平行状，其流线分布不太均匀。压力分布图显示，舒张期B-H泵局部低压区较多，L—Y泵只有1个局部低压区，收缩期B—H泵压力分布与L-Y泵类似。L-Y泵和B—H泵舒张期早期最高速度分别为0．472m／s和0．486m／s；收缩期中期最高速度分别为1．33m／s和1．34m／s。结论L—Y泵能保持较好的线性流场，流线和压力分布较合理。B—H泵出人口区较易形成湍流，压力分布不够均匀，小旋涡和湍流较多。Objective To study the flow field of Luo-Ye （L-Y） pump, a ventricular assist pump, and to compare it with Berlin Heart （B-H） pump. Methods In this study, computational fluid dynamics （CFD） was adopted to study the flow fields of L-Y pump （80 ml）and B-H pump（80 ml）. Between two types of pump, a comparison was made of their typical cross sections in their streamline and pressure distribution charts. Results By streamline charts, continuous streamline flow was demonstrated during early diastole, and steadily involved in a coherent spiral vortex during mid-diastole in L-Y pump. In B-H pump, similar streamline flow was observed during early diastole while the vortex was not formed during mid-diastole. At systole, blood efflux was found in both pumps, with even distribution of streamlines in L-Y pump due to its cross design and somewhat less even streamline distribution in B-H pump owing to the parallel structure of its outlet and inlet. The pressure distribution charts showed a number of local low-pressure areas during diastole in B-H pump but only one in L-Y pump. Similar pressure distribution during systole was found in both L-Y and B-H pumps. Maximum speed of L-Y pump and B-H pump was 0.472 rn/s and 0.486 m/s during early diastole; 1.33 m/s and 1.34 m/s during middle systole. Conclusions L-Y pump may favorably preserve a linear flow field as well as rational distribution of streamlines and pressure, in contrast to frequent oeeurrence of small turbulence at outlet and inlet, as well as less even distribution of pressure seen with B-H pump.

关 键 词：计算机辅助设计 辅助循环 微流体学 罗叶血泵 Berlin Heart血泵 

分 类 号：R541.6[医药卫生—心血管疾病]