Technical study for preparing Nim-PLLA (nimesulide-poly-l-lactic acid) composite microsphere with supercritical anti-solvent method

The invention relates to a method for preparing a Nim-PLLA (nimesulide-poly-l-lactic acid) composite microsphere with a supercritical anti-solvent crystallization technology. The nimesulide sustained-release microsphere with a sustained-release effect is prepared. The grain size of the drug composite microsphere can be effectively controlled through change of the drug solvent variety, the solution concentration, the crystallization pressure, the crystallization temperature, the flow velocity of the introduction of a solution sample and the like, and the grain size of the prepared microsphere is in a range from 1 mu m to 10 mu m. According to the drug sustained-release microsphere prepared with the method, the drug solubility and the drug sustained-release property are effectively improved. 本发明涉及种超临界抗溶剂结晶技术制备尼美舒利-左旋聚乳酸复合微球的方法。制备得到具有缓释效果的尼美舒利缓释微球。通过改变药物溶剂种类、溶液浓度、结晶压力、结晶温度以及溶液进样流速等可有效的控制药物复合微球的粒径，制备得到微粒粒径在1～10μm范围。通过本发明方法制备得到的药物缓释微球有效的提高了药物溶解度以及药物缓释性能。