BACKGROUND:Studies have shown that polyethylene polymer-synthesized ureteral stents have good biocompatibility in vivo, but the side effects are found to induce the body to produce inflammatory, pyrogenic, and al ergic reactions. Therefore, studies have mainly aimed to explore the biocompatibility, toxic and side effects, inflammation of newly developed ureteral stents synthesized by L-lactic acid, glycolide, and barium sulfate. OBJECTIVE:Based on the biocompatibility comparisons on cel toxicity test, inflammatory reaction, al ergic reaction, pyrogen reaction and mortality after implantation between the usage of polyethylene material and L-lactic acid, glycolide, barium sulphate syntheses, to provide a better reference to introduce a new clinical ureteral stent material. METHODS:There were three groups in the experiment:blank control group, new material group, polyethylene group. Cel s were cultured in normal medium, leach liquid of L-lactic acid, glycolide, barium sulphate syntheses and leach liquid of polyethylene, respectively. RESULTS AND CONCLUSION:The toxic effects were significantly enhanced in the urethral epithelial cel s that grew in the leach liquids of two materials compared with the blank control group (P<0.05), but the two kinds of materials had no significant statistical difference in the toxicity test (P>0.05). Hematoxylin-eosin staining results showed that there were obvious inflammatory infiltrations in muscle tissue and the number of neutrophils and eosinophils were increased when the two kinds of materials were implanted in the rats for 2 and 6 weeks (P<0.05), but the inflammatory infiltration and tissue damage in the new material group was less than that in the polyethylene group (P<0.05). ELISA results showed that the serum concentrations of interleukin-10 and interleukin-23 were significantly increased when the two kinds of materials were implanted in the rats for 6 weeks (P<0.05), but the content of inflammatory cytokines in the new material group was less than that in the polyethylene group (P<0.05). In the new material group, there was only one rat that developed al ergic reaction and there was no pyrogen reaction or death;however, in the polyethylene group, there were three rats with presence of al ergic reaction and one rat with pyrogen reaction but no death. These findings indicate that the new ureteral stent material synthesized with L-lactic acid, glycolide and barium sulphate can reduce inflammation reactions, al ergic reactions and pyrogen reactions to the body, and has better biocompatibility than polyethylene composite material.%背景：有研究表明，聚乙烯高分子合成的输尿管支架在体内实验中具有良好的生物相容性，但实验发现其毒副作用，诱导机体产生的炎症、热原、过敏反应均较明显，故对于新研发的L-乳酸、乙交酯、硫酸钡合成的新型输尿管支架在生物相容性、毒副作用、机体炎症反应等方面的探索是实验研究的重点内容。目的：通过对临床上使用的聚乙烯高分子合成输尿管支架和L-乳酸、乙交酯、硫酸钡合成的新型输尿管支架在细胞毒性试验、动物体植入后引起的炎症反应以及过敏反应、热原反应、致死率等生物相容性方面的比较，为临床上引入新型输尿管支架材料提供一定的参考依据。方法：实验分为3组，空白对照组不作任何处理，使用正常培养基培养；新型材料组细胞采用L-乳酸、乙交酯、硫酸钡合成材料浸提液进行培养；聚乙烯组细胞采用聚乙烯浸提液进行培养。结果与结论：活细胞数目检测结果显示，在尿道上皮细胞培养皿中加入两种输尿管支架浸提液后，与空白对照组相比，毒性反应均明显增强(P <0.05)，但两组毒性差异无显著性意义。苏木精-伊红染色结果显示，将两种材料植入大鼠体内2，6周后，肌肉组织均有明显的炎性浸润、中性粒细胞和嗜酸性粒细胞增加，但植入新型材料组的炎性浸润和组织损伤明显少于植入聚乙烯组(P<0.05)。酶联免疫吸附试验结果显示，植入两种材料6周后，大鼠血清中炎性因子白细胞介素10，23的含量均明显增高(P<0.05)，但植入新型材料组的炎性因子表达量明显低于植入聚乙烯组(P<0.05)。支架植入6周后，新型材料组的大鼠在实验过程中出现过敏反应和热原反应的数量均少于聚乙烯组。结果证实，L-乳酸、乙交酯、硫酸钡合成的新型输尿管支架材料能减少组织对于材料的炎症反应、过敏反应、热原反应，具有比聚乙烯合成材料更好的生物相容性。
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