摘要
不可降解的覆膜支架和药物涂层支架从一定程度上抑制了内膜增生,降低了再狭窄的出现率,为冠心病的治疗带来了新的希望,但支架本身是一种金属异物,可以导致血栓的形成和引起机体的免疫反应。新型生物可降解支架具有良好的生物相容性和生物降解性,其降解产物降解为二氧化碳和水,参与新陈代谢,对人体无毒性,可以避免金属永久支架引起的并发症。但生物可降解支架也存在机械性能差、支撑力不足等问题。通过优化生物材料的整体性质,调整材料的分子结构,提高材料的生物稳定性和可控性,减少炎症反应及置入后血管再狭窄的发生,是医学和材料学界研究者关注的重要课题。
Nondegradable stent graft and drug-eluting stent inhibit intima hyperplasy to certain extent, reduce the incidence of restenosis, and probabilize the treatment of coronary artery disease. However, the stent is a metallic foreign body, so it can induce thrombogenesis or immune responses. Novel biodegradable stent has good biocompatibility and biodegradation. It can degrade into CO2 and H2O2, participate metabolism, with no toxicity or complication caused by permanent metal stent. However, the biodegradable stent possesses inadequate mechanical performance and support. How to improve the biological stability and controllability through optimizing material integral quality and modulating their molecular constitution, and how to reduce inflammatory reaction and vascular restenosis after stenting are the study focuses in medical and material fields.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2008年第17期3293-3296,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
