使用冰滴为致孔剂制备表面大孔、内部孔洞相连的新型壳聚糖(HPCS)支架,将其与聚乳酸复合制备出三维蜂窝状孔洞结构的复合支架(THCP).对HPCS和THCP进行了表面形貌、力学性能、细胞相容性等方面的表征,并与常规冻干法所制备的壳聚糖(CS)海绵进行了对比.结果表明,在HPCS海绵表面均匀分布着大而开放的孔洞,大孔内部形成相互贯通的小孔,在THCP复合海绵内部形成了相互贯通的蜂窝状结构.THCP支架的力学强度比纯壳聚糖支架有明显的提高,其细胞活性及细胞增殖指数等都明显优于HPCS及CS海绵.因此,对壳聚糖拓扑结构的这种设计不仅弥补了常规冻干支架的缺陷,提高了细胞相容性,还将表面图案化改性应用延伸到了三维尺度.
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