水溶性梳状聚乙二醇构建的血液相容性涂层

随着现代医学的飞速发展，各种微创介入医疗装置如医用导管、手术导引线、金属支架已广泛地应用到各种医疗手段中，极大地丰富了现代医学诊疗技术．然而，现有的装置在临床应用中，依然不同程度地存在感染、凝血和术后组织增生等问题。为了解决这一问题，人们设计了一系列血液相容性的涂层表面，如构建仿细胞膜的磷酸胆碱基聚合物载药涂层旧，含肝素的血液相容性涂层等．设计生物相容性聚合物基载药涂层实现药物在预定部位的定向释放，为解决这些问题提供了有效的途径。

CONSTRUCTION OF A BLOOD COMPATIBLE COATING VIA AMPHIPHILIC COMB-LIKE POLY(ETHYLENE GLYCOL)

A water soluble hydroxy-capped comb-like poly(ethylene glycol)(CPEG) was prepared via atom transfer radical polymerization(ATRP).A stable CPEG coating was obtained via dip-coating followed by curing at 70℃ for 48 h.The CPEG-modified surface was proved to be stable in both aqueous environment and ambient according to contact angle behavior and weight decrement testing.The coating forming mechanism was investigated through FTIR,the spectra data demonstrated the stability of CPEG coating derived from its hydrogen bond of inter-molecules and intra-molecules.Platelet experiment showed CPEG modified surface reacted extremely weakly with platelet and showed excellent thrombus resistance than that of both on the pure PET surface and PET surface modified with linear PEG.The model drug RD6G was applied to fabricate a drug-buried CPEG coating surface.The drug-releasing curve demonstrated the stability of the CPEG coating and the controlled-release behavior of RD6G.The unique property of CPEG coating surface provided the potential application in the immobilization and release of aqueous drug,including protein and peptide.