可降解镁合金管材及其胆管内支架

Biodegradable Magnesium Alloy Tubes and Biliary Stent

镁合金支架由于其具有独特的可降解性,开启了胆管支架应用的新纪元。本文对AZ31管材进行了不同变形量的冷轧试验,控制变形量ε在15%左右,可得到最佳的表面质量及管材性能,选择400℃的热处理工艺能有效消除内应力,同时细化晶粒、均匀组织。文章还对镁合金胆管支架和临床广泛在用的不锈钢支架在生物相容性、支架扩张性、轴向缩短率等方面进行了对比,考量可降解支架在胆管领域应用的可行性。

Because of the biodegradable character,magnesium alloys opened a new era applications of biliary stent. AZ31 magnesium alloy rolled in room temperature,if the ε value was controlled at 15 %,it could get the best tube surface and mechanical capability,the excellent heat treatment was 400 ℃. These techniques can slake the internal stress and crystal grain could be refinement. Compared the biocompatibility and axial shortening rate between magnesium alloy stent and stainless steel stent, the feasibility of biodegradable stent in the bile duct field was considered.