BACKGROUND: Biliary stent is widely used in different biliary tract surgeries, and there are some defects in the use of biliary stent.
OBJECTIVE: To explore the biodegradability and compatibility of polylactide/glycolide biliary stent.
METHODS: The polylactide/glycolide biliary stent was prepared, and immersed in the bile. At 1, 2, 3, 4 and 5 weeks after soaking, eight experimental stents were dried and placed under the scanning electron microscope. In the sterile condition, the stent was implanted under the rat skin. At 1, 2, 3, 4, and 5 weeks after implantation, two rats were sacrificed. The stent was taken out. The appearance of the stent and muscle structure of experimental animals was observed. The gross appearance of stent was observed at different time by scanning electron microscopy. The rate of degradation was calculated. The muscle structure of experimental animal and the stent were understood.
RESULTS AND CONCLUSION: At 1 week, stent shape remained almost intact, but the texture became soft; surface roughness and cracks gradually appeared; stent wall collapse was visible. The stent was completely degraded at 5 weeks. Before degradation, the stent presented clear three-dimensional reticular structure observed by scanning electron microscopy. With the time extended, the stent surface and section corrosion became worsened. By gel permeation chromatography detection, at 1 week of implantation, the molecular mass of the stent declined rapidly, and then gradually declined. At 2 weeks, the relative molecular mass decreased to
15 000. At 4 weeks, stent mass loss was approximately 40%. All the experimental animals were survived, no poisoning, allergy or heat source response. The operative wound was healed well, and no infection occurred. By histological observation, at 5 weeks, the stent was completely degraded, with a degradation rate of 100%. Surrounding muscles recovered to a normal state. These results indicate that the polylactide/glycolide biliary stent has good degradation in vitro and biocompatibility.
中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程