生物可降解支架膨胀性能的对比分析

Comparison and Analysis on Expansion Performance of Biodegradable Polymer Scaffold

研究了M型可降解支架材料PLLA在膨胀过程中的力学特性对支架膨胀特性的影响。建立M型支架,并将赋予其3种不同的材料,316L不锈钢、WE43镁铝合金、PLLA,利用有限元方法,对其进行膨胀过程模拟。研究了3种不同材料的变形特性和膨胀性能。结果表明:随着压力的增加,其径向、轴向和周向变形都在不断变化,其中316L材料的变化量受压力影响较小;WE43镁铝合金在膨胀过程中存在变形突变点;PLLA受压力的影响较为敏感,导致其径向支撑力较弱,需要改变其弹性模量和屈服强度以增加其在膨胀过程中的力学性能。

The effects of mechanical properties of M-type degradable scaffold material PLLA on the expansion characteristics of the scaffold during the expansion were studied.The M-type scaffold was established and three different materials(316 L stainless steel,WE43 magnesium-aluminum alloy and PLLA)were assigned.The finite element method was used to simulate the expansion process.The deformation characteristics and expansion properties of three different materials were studied.The results show that with the increase of pressure,the radial,axial and circumferential directions of the three materials constantly change.The deformation of 316 L material is less affected by the pressure.There is a sudden change of deformation during the expansion process of WE43 magnesium alloy.PLLA is sensitive to the pressure,which can make its radial support force weak.It is necessary to change its elastic modulus and yield strength to increase its mechanical properties during the expansion.