脂肪族聚碳酸酯涂層支架的制備和性能研究
[Abstract]:Percutaneous coronary intervention for (PCI) has undergone simple balloon dilatation for more than 30 years. Three leaps from bare metal stent (BMS) to drug-eluting stent (DES). Des can bring a certain dose of drugs directly to the lesion vessel. Reduce the restenosis rate to less than 10%. Des is coated with one or two layers of stable polymer coating on the surface of the metal stent for the purpose of drug delivery and release. Polymers remain in blood vessels as permanently as stents. The permanent polymer coating of des may be an important cause of delayed healing of blood vessels and thrombus in (polar) late stents, so the development of novel stents with low toxicity to vascular wall is a hot research topic at present. Degradable polymer coating DES is one of the research trends. As the drug carrier of DES, degradable polymer gradually degrades to small molecule after completing its task, which avoids the long-term stimulation of permanent polymer to vascular wall. In this paper, aliphatic polycarbonate (APC) with surface dissolution and degradation was selected as the degradable polymer coating material of the scaffold, and the DES. was prepared by coating it directly with rapamicin solution on 316L stainless steel scaffold. The main contents and results of the paper include: 1. The surface treatment and DES spraying process of 316L stainless steel support were studied, and the suitable process parameters were determined. Then the effects of manual dipping and automatic spraying on the properties of the coating are discussed, and the reasons for the different effects are analyzed theoretically. 2. The mass loss rate and water absorption rate of aliphatic polycarbonate in PBS simulated body fluid were studied. according to the experimental results, polyethyl carbonate (PEC) and polypropylidene carbonate (PPEC) were selected as scaffolding coating materials. Then the cytotoxicity test, hemolysis test and partial coagulation activating enzyme time test showed that PEC and PPEC had excellent biocompatibility. 3. PPEC, was synthesized catalyzed by zinc glutarate and the feasibility of PEC and PPEC as coronary stent coating materials was deeply studied. the experimental results show that aliphatic polycarbonate coated stents have broad application prospects. 4. The effects of shielding layer, drug gradient, carrier type, ratio of carrier to drug and release medium on DES drug release were investigated in detail. The coated drug release mode and its control factors were clarified, and the design of degradable drug carrier and DES was optimized.
【學(xué)位授予單位】:鋼鐵研究總院
【學(xué)位級別】:博士
【學(xué)位授予年份】:2012
【分類號】:TH789
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