北京生物醫(yī)學工程

球囊擴張式支架擴張過程的數(shù)值模擬

Numerical simulation of expansion process of balloon-expandable stent

作者：石更強潘肖林李元吳山山

單位：上海理工大學醫(yī)療器械與食品學院（上海 200093）

關鍵詞：球囊擴張式支架; 數(shù)值模擬; 體積控制; 有限元分析; 應力分布

分類號：R318.04

出版年·卷·期（頁碼）：2018·37·3（241-245）

摘要：

目的求解支架擴張過程中的應力、形變分布云圖, 以及壓強-直徑變化曲線, 獲取球囊擴張式支架整體性能數(shù)據(jù)。方法使用“體積控制”球囊-支架模型, 運用有限元分析軟件ANYSY進行數(shù)值模擬, 并與實驗數(shù)據(jù)進行比較。結果支架-球囊模型可以很好地模擬支架擴張全過程;當球囊膨脹至最大直徑, 支架模型的主體結構與加強筋連接位置會發(fā)生塑性形變, 而最大應力也分布在連接位置。結論通過有限元分析可以對支架性能進行優(yōu)化。

Objective To obtain the stress and deformation distribution nephogram, the pressurediameter curve of the stents during stent expansion, and to obtain performance data of balloon-expandable stent.Methods The finite element analysis software ANYSY was used to carry out the numerical simulation and compared with the experimental date by using the volume control model of ballon stent. Results The model of balloon stent could well simulate the expansion process of balloon-expandable stent. When the balloon was inflated to the maximum diameter, main structure and reinforcing connection position of stent model could produce plastic deformation, and the maximum stress was distributed at the connecting position. Conclusions The performance of the scaffold can be optimized by finite element analysis.

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