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Aiming at the problem that loop-end braided stents are prone to loop-end fracture during crimping, the key design parameters affecting the structural stability of loop-end braided stents were explored, and an improvement scheme was proposed.Numerical simulation of crimping for magnesium alloy loop-end braided stents was conducted using Abaqus analysis software. The results showed that increasing the braiding angle can effectively reduce the risk of loop-end fracture.Based on this finding, a variable pitch stent was designed, which features increasing the braiding angle at both ends to form sparse segments while maintaining the braiding angle in the middle of the stent. The influence of adjusting the length and braiding angle of the sparse segments on the mechanical response of the stent was evaluated.The research results showed that increasing the braiding angle and length of the sparse segments can effectively reduce the axial elongation and loop-end stress of the stent, but it will shorten the length of the middle dense segment, thereby reducing the radial force of the stent. Different from the flared expansion of the constant pitch open-end stent, the variable pitch stent presents a shape with large middle expansion and small end expansion after expansion.This study reveals the potential of variable pitch design in controlling loop-end fracture and provides a reference for the structural optimization of magnesium alloy braided stents.
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针对环端编织支架在压握过程中容易发生环端断裂的问题,探索了影响环端编织支架结构稳定性的关键设计参数,并提出了相应的改进方案。采用Abaqus软件对镁合金环端编织支架进行压握数值模拟,结果表明,增大编织角度可以有效降低环端断裂风险。基于这一发现,设计了变螺距支架,其特点是在保持支架中间编织角度不变的前提下,增大两端的编织角度,形成稀疏段。通过调整稀疏段的长度和编织角度,评估其对支架机械响应的影响。研究结果显示,增大稀疏段编织角度和长度,可以有效降低支架的轴向伸长率和环端应力,但会缩短中间加密段的长度,从而降低支架的径向力;与恒螺距开放端支架的喇叭状扩张不同,变螺距支架扩张后呈现中间扩张大、两端扩张小的形态。本研究揭示了变螺距设计在控制环端断裂方面的潜力,并为镁合金编织支架的结构优化提供参考。
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薛广明,男,1996年生,山西吕梁人,硕士研究生;主要研究方向为血管支架结构设计及降解分析;E-mail:guangming_xue@163.com。
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薛广明,男,1996年生,山西吕梁人,硕士研究生;主要研究方向为血管支架结构设计及降解分析;E-mail:guangming_xue@163.com。
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128:105123., articleTitle=Mixed-braided stent:An effective way to improve comprehensive mechanical properties of poly (L-lactic acid) self-expandable braided stent, refAbstract=null)], funds=[Fund(id=1241451344968601605, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, awardId=12362030, language=EN, fundingSource=National Natural Science Foundation of China(12362030), fundOrder=null, country=null), Fund(id=1241451345065070602, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, awardId=12362030, language=CN, fundingSource=国家自然科学基金项目(12362030), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241451337913782928, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, xref=null, ext=[AuthorCompanyExt(id=1241451337926365842, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, companyId=1241451337913782928, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China), AuthorCompanyExt(id=1241451337934754453, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, companyId=1241451337913782928, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=新疆大学 机械工程学院,乌鲁木齐 830047)])], figs=[ArticleFig(id=1241451340459725632, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.1, caption=
Structure diagram of the braided stent, figureFileSmall=GuW3ralpe7LRGzTybQApwg==, figureFileBig=I5C+Ow5cxa+EYfjqfyH6Fg==, tableContent=null), ArticleFig(id=1241451340547806022, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图1, caption=
编织支架结构示意图, figureFileSmall=GuW3ralpe7LRGzTybQApwg==, figureFileBig=I5C+Ow5cxa+EYfjqfyH6Fg==, tableContent=null), ArticleFig(id=1241451340732355407, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.2, caption=
Assembly diagram of compression model, figureFileSmall=6YIAeEIbBQJV+oFX+JbJXg==, figureFileBig=56J4R7vWZOQ4YMGytjiG6A==, tableContent=null), ArticleFig(id=1241451340833018710, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图2, caption=
压缩模型装配图, figureFileSmall=6YIAeEIbBQJV+oFX+JbJXg==, figureFileBig=56J4R7vWZOQ4YMGytjiG6A==, tableContent=null), ArticleFig(id=1241451342372328290, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.3, caption=
Effect of different braiding parameters on the radial compression performance of the stents, figureFileSmall=ha+o72Bc0cY1keOyg67t7g==, figureFileBig=WsfcqVWBmIbUN8BLwoHi8w==, tableContent=null), ArticleFig(id=1241451342481380201, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图3, caption=
不同编织参数对支架径向压缩性能的影响, figureFileSmall=ha+o72Bc0cY1keOyg67t7g==, figureFileBig=WsfcqVWBmIbUN8BLwoHi8w==, tableContent=null), ArticleFig(id=1241451342598820722, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.4, caption=
Structure diagram of the variable pitch stent, figureFileSmall=hRh9ld+Bl4muu4AbgHM16g==, figureFileBig=5+xREnJrzsAt/LGszJRrrw==, tableContent=null), ArticleFig(id=1241451342712066938, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图4, caption=
变螺距支架结构示意图, figureFileSmall=hRh9ld+Bl4muu4AbgHM16g==, figureFileBig=5+xREnJrzsAt/LGszJRrrw==, tableContent=null), ArticleFig(id=1241451342842090377, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.5, caption=
Compression and expansion stress nephogram of stents, figureFileSmall=MrkCB7NNYgF7JaztmbJ5Nw==, figureFileBig=vrWDuwYuiqTYUrf/GaCysA==, tableContent=null), ArticleFig(id=1241451342934365071, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图5, caption=
支架压握扩张应力云图, figureFileSmall=MrkCB7NNYgF7JaztmbJ5Nw==, figureFileBig=vrWDuwYuiqTYUrf/GaCysA==, tableContent=null), ArticleFig(id=1241451343035028373, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.6, caption=
Maximum stress with the radial compression of stents, figureFileSmall=MhmKLotlE/AWV9Bw4i4xGA==, figureFileBig=3R42ae1V44h0KKlX+NBTaQ==, tableContent=null), ArticleFig(id=1241451343135691676, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图6, caption=
支架径向压缩时的最大应力, figureFileSmall=MhmKLotlE/AWV9Bw4i4xGA==, figureFileBig=3R42ae1V44h0KKlX+NBTaQ==, tableContent=null), ArticleFig(id=1241451343257326498, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.7, caption=
Axial elongation rate of stents after radial compression, figureFileSmall=p9RZEgJ6N1yxWa6qoWrWKQ==, figureFileBig=TXHXtsSnvsg9qvH5i8n5ag==, tableContent=null), ArticleFig(id=1241451343399932843, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图7, caption=
支架径向压缩后的轴向伸长率, figureFileSmall=p9RZEgJ6N1yxWa6qoWrWKQ==, figureFileBig=TXHXtsSnvsg9qvH5i8n5ag==, tableContent=null), ArticleFig(id=1241451343542539187, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.8, caption=
Variation curves of diameter-radial support forces and radial stiffnesses of the stent, figureFileSmall=5Z1guPiCtGuzEwUrvhrTfQ==, figureFileBig=mVExqqEhd4GhJ2bf1swF9A==, tableContent=null), ArticleFig(id=1241451343668368316, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图8, caption=
支架的直径-径向支撑力变化曲线和径向刚度变化曲线, figureFileSmall=5Z1guPiCtGuzEwUrvhrTfQ==, figureFileBig=mVExqqEhd4GhJ2bf1swF9A==, tableContent=null), ArticleFig(id=1241451343802586052, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.9, caption=
Radial resilience at the middle position of stents after stent expansion, figureFileSmall=obO7rNEDtc3nkuKbQYcxTA==, figureFileBig=6bsE+wpZSnWMFKFj4zdCZA==, tableContent=null), ArticleFig(id=1241451343915832269, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图9, caption=
支架扩张后中间位置的径向回弹率, figureFileSmall=obO7rNEDtc3nkuKbQYcxTA==, figureFileBig=6bsE+wpZSnWMFKFj4zdCZA==, tableContent=null), ArticleFig(id=1241451344033272790, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Fig.10, caption=
Variation of the expansion non-uniformity rate for stents, figureFileSmall=MGZvctj9mDN7FjmDLscsnA==, figureFileBig=S2c2/EYACVVa/ja8mRpl5g==, tableContent=null), ArticleFig(id=1241451344138130393, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=图10, caption=
支架扩张不均匀率变化, figureFileSmall=MGZvctj9mDN7FjmDLscsnA==, figureFileBig=S2c2/EYACVVa/ja8mRpl5g==, tableContent=null), ArticleFig(id=1241451344238793693, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Tab. 1, caption=
Four groups of different structural parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
组 Group | D0/mm | n | α/(°) | d/mm |
|---|
| Ⅰ | 6 | 20,24,28,32 | 30 | 0.18 |
| Ⅱ | 6 | 24 | 30,40,50,60 | 0.18 |
| Ⅲ | 6 | 24 | 30 | 0.16,0.18,0.2,0.22 |
| Ⅳ | 6,7,8,9 | 24 | 30 | 0.18 |
), ArticleFig(id=1241451344381400036, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=表1, caption=
4组不同的结构参数
, figureFileSmall=null, figureFileBig=null, tableContent=
组 Group | D0/mm | n | α/(°) | d/mm |
|---|
| Ⅰ | 6 | 20,24,28,32 | 30 | 0.18 |
| Ⅱ | 6 | 24 | 30,40,50,60 | 0.18 |
| Ⅲ | 6 | 24 | 30 | 0.16,0.18,0.2,0.22 |
| Ⅳ | 6,7,8,9 | 24 | 30 | 0.18 |
), ArticleFig(id=1241451344528200681, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=EN, label=Tab. 2, caption=
Structural parameters of the variable pitch stent
, figureFileSmall=null, figureFileBig=null, tableContent=
端部 End | 加密段编织角 Braiding angle of the encryption segment αM/(°) | 稀疏段编织角 Braiding angle of the sparse segment αE/(°) | 稀疏段长度 Length of the sparse segment |
|---|
| 开放端Open end | 30 | 30 | 0 |
| 环端Loop end | 30 | 50 | La,2La,3La |
| 环端Loop end | 30 | 55 | La,2La,3La |
| 环端Loop end | 30 | 60 | La,2La,3La |
), ArticleFig(id=1241451344645641200, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408879725171156, language=CN, label=表2, caption=
变螺距支架结构参数
, figureFileSmall=null, figureFileBig=null, tableContent=
端部 End | 加密段编织角 Braiding angle of the encryption segment αM/(°) | 稀疏段编织角 Braiding angle of the sparse segment αE/(°) | 稀疏段长度 Length of the sparse segment |
|---|
| 开放端Open end | 30 | 30 | 0 |
| 环端Loop end | 30 | 50 | La,2La,3La |
| 环端Loop end | 30 | 55 | La,2La,3La |
| 环端Loop end | 30 | 60 | La,2La,3La |
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