冻干猪主动脉复水过程中水分吸收和扩散机理研究

Research for Saline Imbibitions and Diffusion During Rehydration of Freeze-Dried Pig Aorta

本实验分析了血管复水过程的水分吸收和扩散的传质机理。对冻干的猪主动脉血管进行了复水各阶段的图像扫描和称重,得到了复水各阶段横截面变化图,计算出血管复水过程孔隙率、水分吸收比及吸水速率的变化。结果表明,复水0 5～1h是血管急剧吸水变化的阶段,各项数据变化明显;3 h后,物料含水量、孔隙率、吸水速率呈动态调整和变化,吸水基本达到饱和;整个过程,水分的吸收呈线性增长,孔隙率较冻干时不断下降,直至最后接近新鲜血管。同时指出,常温条件下,生理盐水中浸泡2～2.5 h的猪主动脉血管可进行移植应用。

The mechanism of mass transfer process for water imbibitions and diffusion of the pig aorta were analyzed. The rehydrated pig aortic which had been freeze-dried before were scanned and weighed in various stages. Then the cross-section diagrams, porosity, the ratio of the water absorption and its rate were calculated and received during the retlydration. It was demonstrated that 0.5-1 h was the phase that changes about material moisture in each aspects occurred most significantly. After 3 h, moisture, porosity and water absorption rate were changing dynamicMly and the vessels were nearly saturated. Water absorption was scaled linearly in the whole process, and the porosity declined close to the fresh from the freeze-dried vessels with higher porosity. It also pointed out that, pig aortic could be transplanted when immerged 2-2.5 h in saline and normal temperature.