On the importance of modeling balloon folding, pleating, and stent crimping: An FE study comparing experimental inflation tests.
On the importance of modeling balloon folding, pleating, and stent crimping: An FE study comparing experimental inflation tests.
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DOI：
10.1002/cnm.3249
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发表时间：
2019-11
影响因子：
2.1
通讯作者：
Holzapfel, Gerhard A.
中科院分区：
文献类型：
--
作者：
Geith, Markus A.;Swidergal, Krzysztof;Hochholdinger, Bernd;Schratzenstaller, Thomas G.;Wagner, Marcus;Holzapfel, Gerhard A.
目前还没有基于有限元（FE）的术前过程研究，如折叠、打褶和支架压握，并与实验性充盈试验进行比较。因此，提出了一种新的工作流程，其中球囊折叠和打褶的残余应力以及支架压握和所有接触伙伴的几何形状最终在FE代码中实现，以通过使用隐式求解器模拟支架扩张。数值结果表明，在生产步骤期间经历的残余应力和应变的结合显著提高了后续模拟的准确性，尤其是支架扩张模型的准确性。在术前过程中，膜和支架材料内部的应力也达到了相当高的水平。因此，不能假设球囊导管或支架在实际手术前未损坏。逼真几何形状的实现，特别是球囊锥形和工艺装置的刀片，改善了扩张机制的模拟，例如支架单元的狗骨化、凹弯曲或过度扩张。这项研究表明，隐式求解器能够精确地模拟上述术前过程和支架扩张过程，而无需预先操纵模拟时间或物理质量。本研究表明，冠状动脉支架植入的有限元分析可以通过采用几何形状以及术前过程（如折叠、打褶和卷曲）的残余应力和应变来显著改善。在上述过程中，球囊导管膜和支架材料内部的应力达到严重水平。此外，该研究表明，最新的隐式求解器能够精确分析术前过程和冠状动脉支架植入，而无需操纵模拟时间或物理质量。
Finite element (FE)–based studies of preoperative processes such as folding, pleating, and stent crimping with a comparison with experimental inflation tests are not yet available. Therefore, a novel workflow is presented in which residual stresses of balloon folding and pleating, as well as stent crimping, and the geometries of all contact partners were ultimately implemented in an FE code to simulate stent expansion by using an implicit solver. The numerical results demonstrate that the incorporation of residual stresses and strains experienced during the production step significantly increased the accuracy of the subsequent simulations, especially of the stent expansion model. During the preoperative processes, stresses inside the membrane and the stent material also reached a rather high level. Hence, there can be no presumption that balloon catheters or stents are undamaged before the actual surgery. The implementation of the realistic geometry, in particular the balloon tapers, and the blades of the process devices improved the simulation of the expansion mechanisms, such as dogboning, concave bending, or overexpansion of stent cells. This study shows that implicit solvers are able to precisely simulate the mentioned preoperative processes and the stent expansion procedure without a preceding manipulation of the simulation time or physical mass. This study shows that finite element analyses of coronary stent implantations can be significantly improved by adopting geometries as well as residual stresses and strains from preoperative processes such as folding, pleating and crimping. During the mentioned processes, stresses inside the balloon catheter membrane and stent material reached a severe level. Furthermore, this study showed that up‐to‐date implicit solvers are able to precisely analyze preoperative processes and coronary stent implantations without manipulating the simulation time or the physical mass.
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DOI：
10.1002/cnm.2890
发表时间：
2017-12-01
影响因子：
2.1
作者：
Bukala, Jakub;Kwiatkowski, Piotr;Malachowski, Jerzy
通讯作者：
Malachowski, Jerzy
DOI：
10.1080/10255840601071087
发表时间：
2007-02-01
影响因子：
1.6
作者：
Migliavacca, F.;Gervasco, F.;Dubini, G.
通讯作者：
Dubini, G.
影响因子：
2.4
作者：
Migliavacca, F;Petrini, L;Pietrabissa, R
通讯作者：
Pietrabissa, R
影响因子：
3.2
作者：
Mortier, Peter;De Beule, Matthieu;Verhegghe, Benedict
通讯作者：
Verhegghe, Benedict
影响因子：
2.4
作者：
Dumoulin, C;Cochelin, B
通讯作者：
Cochelin, B