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Development of new endovascular stent-graft system for type B thoracic aortic dissection with finite element analysis and experimental verificationXiaochen Zhou1,Yufeng Zheng1,5,Zhili Sun51... specially for the treatment of Stanford type B thoracic aortic dissections(TAD).Numerical study with finite element analysis(FEA) was utilized to evaluate the mechanical behaviors of the individual......
Novel transcatheter aortic heart valves exhibiting excellent hemodynamic performance and low-fouling propertyF.Guo1,2,K.Jiao1,2,Y.Bai1,2,J.Guo3,R.Yang1,2,X.Zhang1,21. Shenyang National Laboratory... and Material Engineering, Dalian Polytechnic University摘 要:Transcatheter aortic heart valves(TAHVs) have been widely used for aortic valve replacements, with less......
New nitinol endovascular stent-graft system for abdominal aortic aneurysm with finite element analysis and experimental verificationXiao-Chen Zhou1,Ming Zhao4,Yu-Feng Zheng1,5,Zhi-Li Sun51..., Peking University摘 要:Abdominal aortic aneurysm(AAA) is one of the most common and catastrophic manifestations of the acute aortic syndrome that can......
model based on triangle mesh dissection DAI Qian-wei, WANG Hong-hua, FENG De-shan, CHEN De-peng (School of Geosciences and Info-Physics, Central South University, Changsha 410083, China) Abstract: For the problem that finite difference time domain method (FDTD) and finite element method (FEM) based on the rectangular mesh dissection have poor adaptability to the patterns that physical......
="ChDivSummary">To investigate the effects of polyethylene glycol cross-linking on the mechanical properties, 80 porcine aortic valves were harvested, decellularized, and introduced with sulfhydryl... group was positively correlated with the molecular weight of PEG. It was concluded that branched PEG with the molecular weight of 20 k Da can effectively cross-link the decellularized porcine aortic......
uniaxial tension and results show that matching mechanical properties to that of porcine aortic root can be achieved. A fatigue machine for elastomer materials and tissues was built and fatigue test on PVA......
Immobilization of RGD Peptidcs onto Decellularized Valve Scaffolds to Promote Cell Adhesion史嘉玮摘 要:<正>Porcine aortic valves were decellularized with trypsinase/EDTA and Triton-100.With the help of a coupling reagent Sulfo-LC-SPDP,the biological valve scaffolds were immobilized with one of RGD (arginine-glycine-aspartic acid)containing peptides......
基于"T-tube"模型的中心动脉脉搏波双通道盲辨识王璐1,冯澍婷2,姚阳2,徐礼胜2,31. 东北大学信息科学与工程学院2. 东北大学中荷生物医学与信息工程学院3. 东北大学医学影像计算教育部重点实验室摘 要:提出了由两路人体外周动脉脉搏波(peripheral artery pulse wave,PAP)来估计中心动脉脉搏波(central aortic pulse wave,CAP)的多通道盲辨识(multi-channel blind system identification,MBSI)方法,旨在实现心血管系统中心动脉脉搏波的实时无创连续监测.首先简单介绍了多通路盲辨识算法,并证明了心血管系统IIR模型特性可由FIR模型逼近,从而简化了MBSI算法.然后介绍了心血管"T-tube"模型,并结......
采样频率与数据长度对中心动脉波形重建的影响徐礼胜,姜志豪,姚阳,刘文彦东北大学中荷生物医学与信息工程学院摘 要:传递函数法重建CAP (central aortic pressure)多是基于自回归各态历经(auto regressive e Xogenous,ARX)模型或傅里叶变换,未考虑采样频率,数据长度.为了研究采样频率和数据长度对重建CAP的影响,基于ARX模型和傅里叶变换,重建CAP并分析误差.结果表明,采样频率100 Hz,数据长度大于3 s时,基于ARX模型重建CAP效果较好(均方根误差(306. 6±80. 0) Pa,波形匹配度89%);基于傅里叶变换的算法对采样频率不敏感,数据长度为6 s时效果较好(均方根误差(493. 3±320. 0) Pa,波形匹配度84%).
基于子空间法的主动脉压力脉搏波重建刘文彦,徐礼胜,李宗鹏,姜志豪东北大学中荷生物医学与信息工程学院摘 要:有创测量中心主动脉压力波形(central aortic pressure waveform,CAPW)存在一定的风险且花费较大.通常用外周动脉压力波形(peripheral arterial pressure waveform,PAPW)来代替CAPW,而PAPW与CAPW有差异性.虽然盲系统辨识方法能够实时重建与动态辨识中心主动脉压力波形,但该方法在模型定阶上还需改进,因此本文提出了基于Hankel矩阵的秩定阶结合子空间方法用外周动脉压力波形重建中心主动脉压力波形.临床数据验证算法的结果表明,实测的与估计的CAPW的均方根误差约为5. 87 mmHg,波形匹配度约为74. 70%;动物数据进一......
