Page 50 - 南京医科大学自然版
P. 50

南京医科大学学报(自然科学版)                                  第46卷第6期
               ·832  ·                    Journal of Nanjing Medical University(Natural Sciences)   2026年6月


             ·基础研究·

              基于 PCL/PLGA 共混材料的可降解食管支架:降解速率调控与

              体外性能分析



              曹文昕 ,王根庞 ,沈          冲 ,庄著伦 ,武开宏 ,孙          剑  1*
                                             1
                     1
                                                     1*
                                     1
                             2
               南京医科大学附属儿童医院心胸外科,江苏 南京                  210008;南京医融达智能医学增材制造研究院,江苏                南京   211166
              1                                              2
             [摘    要] 目的:开发一种基于聚己内酯(polycaprolactone,PCL)与聚乳酸⁃羟基乙酸共聚物[poly(lactic⁃co⁃glycolic acid),
              PLGA]共混材料的可降解食管支架,通过调控PLGA比例(0%~35%)实现降解速率的可控性,平衡力学性能与降解周期,并探
              索其体外降解特性及临床适配潜力。方法:选择PCL和PLGA用挤出式熔融沉积3D打印技术制备8种梯度共混比例(0%、5%、
              10%、15%、20%、25%、30%、35% PLGA)食管支架,并结合蜂窝状多孔结构设计(孔隙率60%~70%)。采用人工唾液(pH≈6.6)
              与人工胃液(pH≈4.0)进行8周的体外降解实验。结果:PLGA比例显著影响降解速率,PLGA比例增加能够加速支架的降解,
              并且PLGA与PCL共混产生了协同效应(PLGA每增加10%,达到相同失重率的时间缩短50%~70%),PLGA≥25%时导致阶段性
              崩解现象。pH差异对降解影响不显著(P > 0.05),可能因高孔隙设计促进酸产物扩散及PCL疏水性平衡。通过配比调控,降
              解周期为4~24周。结论:PCL/PLGA共混支架通过简单比例调整,实现降解速率精准调控,产生独特的“支撑⁃崩解”模式,降低
              残留风险,满足临床上从先天性狭窄到急性炎症等食管疾病的不同需求。此外,3D打印技术与仿生形态、多孔结构设计相结
              合,显著提高了支架的组织贴合性和抗移位性。本研究为个性化的可降解食管支架治疗提供了理论依据与技术支持。
             [关键词] 可降解食管支架;聚己内酯;聚乳酸⁃羟基乙酸;降解速率;3D打印
             [中图分类号] R318.08;R571               [文献标志码] A                     [文章编号] 1007⁃4368(2026)06⁃832⁃08
              doi:10.7655/NYDXBNSN251068


              Degradable esophageal stent based on PCL/PLGA blend:degradation rate regulation and

              in vitro performance analysis
                                                                     1
                                                                                  1*
                         1
                                                     1
                                         2
              CAO Wenxin ,WANG Genpang ,SHEN Chong ,ZHUANG Zhulun ,WU Kaihong ,SUN Jian     1*
              1 Department of Cardiothoracic Surgery,the Affiated Children’s Hospital of Nanjing Medical University,Nanjing
              210008;Nanjing Yirongda Intelligent Medical Additive Manufacturing Research Institute,Nanjing 211166,China
                     2
             [Abstract] Objective:This study aimed to develop a biodegradable esophageal stent based on polycaprolactone(PCL)blended with
              poly(lactic⁃co⁃glycolic acid)(PLGA),achieving controllable degradation rates by adjusting the PLGA ratio(0%-35%),balancing
              mechanical properties and degradation cycles,and exploring its in vitro degradation characteristics and clinical adaptation potential.
              Methods:PCL and PLGA were selected to prepare eight gradient blend ratios(0%,5%,10%,15%,20%,25%,30%,35% PLGA)by
              extrusion⁃based high⁃temperature melt rotary 3D printing technology,combined with a honeycomb porous structure design(porosity
              60%-70%). In vitro degradation experiments lasting 8 weeks were conducted using artificial saliva(pH≈6.6)and artificial gastric juice
             (pH≈4.0). Results:The PLGA ratio significantly affected the degradation rate,with increasing PLGA proportion accelerating stent
              degradation. The blending of PLGA and PCL produced a synergistic effect(for every 10% increase in PLGA,the time to reach the same
              weight loss rate was shortened by approximately 50%-70%),leading to stage⁃wise disintegration phenomena(when PLGA≥25%). The
              pH difference had no significant impact on degradation(P > 0.05),possibly due to the high⁃porosity design promoting diffusion of
              acidic products and the hydrophobic balance of PCL. Through ratio adjustment,degradation cycles of 4-24 weeks could be achieved.
              Conclusion:The PCL/PLGA blend stent achieves precise control of degradation rate through simple ratio adjustment,producing a

             [基金项目] 南京市医学科技发展重点项目(ZKX22051);南京医科大学优秀中青年教师支持计划(南医2022⁃52)
               通信作者(Corresponding author),E⁃mail:sunjian67@njmu.edu.cn(ORCID:0000⁃0002⁃5296⁃283X);pumcwu@sina.com(ORCID:
              ∗
              0000⁃0002⁃2081⁃9756)
   45   46   47   48   49   50   51   52   53   54   55