三螺旋人工腱索结构的力学性能仿真验证.pdf

生物医学工程研究
Journal of Biomedical Engineering Research
2015,34(2):89~93
三螺旋人工腱索结构的力学性能仿真验证
常丽南,宋成利?,沈桐,梅举2,戴黄栋2
(1.上海理エ大学医疗器楲与食品学院,教育部微创医疔器械工程研究中心,上海20003
2.上海交通大学医学院附属新华医院心胸外科,上海200092)
摘要:基于真实心脏二尖瓣腱索结构,利用仿生学类比方法提出整体三螺旋人工腱索等效替代模型,应
用 ABAQUS对其进行模拟拉伸测试,并与真实拉仲试验下猪心二尖辮腱索(边缘腱索、基底腱索与支撑腱
索)的力学性能进行对比分析,从而验证此等效模型的可行性与有效性。结果表明:三螺旋人工腱索结构所
能承受的最大应力与实际试验中的平均最大应カ一致,且相应腱索种类的拉力位移曲线与试验曲线基本相
符。本研究提出的三螺旋人工腱索结构接近于真实腱索特性,可缓解二尖膜上应力集中现象,为人工腱索
材料的结构改进指明了新方向,同时,仿真过程对有限元模拟生物软组织拉伸性能模块提供了参考价值。
关键词:三螺旋结构;人エ腱索; ABAQUS有限元分析;心脏腱索拉仲试验
中图分类号:R318文献标识码:A文章编号:1672-6278(2015)02-0089-05
Simulation on Mechanical Properties of Triple-helix
Artificial Chordae Structure
CHANG Linan SONG Chengli SHEN Tong MEI Ju, DAI Huangdong?
(1.Shanghai Institute for Minimally Invsive Therapy, School of Medical Instrument and Food Engineering
University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Cardiothoracic Surgery, Shanghai Jiaotong University Affiliated Xinhua Hospital, Shanghai 200092)
Abstact: Bionic equalent leeix atificial chordae structure was estabilished based on the structure of real heart mitral
valve chordae. ABAQUS was applied to simulate the tensile tests. imulation results were analyzed and compared with real chordae
marginal asal and strut chordae )tensile properties to ver ify feasibility and correctness of model. Results showed that the maximum
stress of spiral chordae was consistent with the actual average maximum stress. Besides, force displacement curves of all kinds of chor
dae were basically in accordance with test curves. This proposed triple-helix equivalent model is closer to the real chordae's proper
ties and can reduce stress concentration on mitral leaflets, which indicating a new direction to the structure improvements of artificial
chordae materials and providing reference for finite element researches on soft tissue tensile properties module
Key words: Triple-helix model; Artificial chordae; ABAQUS finite element analysis; The tensile test of heart chordae tendineae
向。由于一些患者先天性心脏病或风湿热感染等原
因,在临床上最常累及的是二尖瓣。从乳头肌延伸
心脏是整个机体循环系统的动力源山。心内至二尖瓣瓣叶的腱素,在左心室中至关重要,使血流
有四组瓣膜,充当“阀门”的作用,控制着血流的方动力均匀分布,并与瓣环、瓣叶、乳头肌组成了二尖
*上海市科委产学研项目(11DZ1921600);上海理エ大学微创励志创新基金资助项目( JWCXSL1402)。
Δ通信作者Email:Cong@uss.edu.cn