CAJ | 학술논문

药物洗脱支架(drug eluting stent,DES)植入血管后的疲劳性能,对冠状动脉支架植入术的成功有着重要影响.利用有限元方法分析支架在使用过程中的应力分布,通过绘制Goodman曲线图分析支架的疲劳强度,并通过计算支架的安全系数来反应支架的安全性.分析发现,支架变形过程中的大应力分布区始终位于支撑体的圆弧部位.Ⅰ型支架和Ⅱ型支架的所有特征点在 Goodman 曲线图中均位于疲劳极限以下,不会造成支架在使用过程中的疲劳失效.此外,支架的安全系数与支架槽的长、宽、高均成负相关.该分析可为支架的设计提供参考依据.
약물세탈지가(drug eluting stent,DES)식입혈관후적피로성능,대관상동맥지가식입술적성공유착중요영향.이용유한원방법분석지가재사용과정중적응력분포,통과회제Goodman곡선도분석지가적피로강도,병통과계산지가적안전계수래반응지가적안전성.분석발현,지가변형과정중적대응력분포구시종위우지탱체적원호부위.Ⅰ형지가화Ⅱ형지가적소유특정점재 Goodman 곡선도중균위우피로겁한이하,불회조성지가재사용과정중적피로실효.차외,지가적안전계수여지가조적장、관、고균성부상관.해분석가위지가적설계제공삼고의거.
After the implantation,the fatigue performance of the drug eluting stent has significant influence on the success of coronary stent implantation.The finite element method was used to analyse the stress distribution of the stent during the process of using,and the fatigue strengh was analysed according to the Goodman curve. The security of the stent was described by the safety factor.It could be found from the analysis that the high-stress area always located in the arc parts during the deformation process.However,all the feature points of the two kinds of stents located under the fatigue limit line.So the failure by fatigue of the stents will not happen during the using process.Moreover,there was a negative correlation between the safety factor of the stent and the length,width,and thickness,respectively.The results prove that the fatigue strength of the stent can be analysed successfully through the finite element method,which provides the reference for the stent design.