RESUMO
Objective To study the feasibility and morphological characteristics of wide caliber of local biliary tract constructed by increasing pressure of local bile duct in a short period of time.Methods Twelve mongrel dogs were randomized into 2 groups.In group A,only inlaid bile duct dilator(IBDD)was placed for biliary drainage in common bile duct.In group B,IBDD was placed in tommort bile duct for biliary drainage and dilated it through affusing 0.1 ml,0.1 5 ml,0.2 ml and 0.25 ml water on postoperative day 1,8,15 and 22,respectively.The expandable ballbladders were kept on being dilated with increasing pressure for a month.Total bilirubin(TB),alanine aminotransferase (ALT),aspartate aminotransferase;aspartate transaminase(AST)of serum,bile duct diameter (BDD),histologic changes of biliary duct wall and hepatic tissue,and postoperative biliary tract contrast were determined before and after operation in both groups.Results There was no significant difference in TB,ALT,AST and histologic changes of hepatic tissue in bilary predilation and postdilation of each group and between group A and group B.There was great difference in BDD in bilary predilation and postdilation of each group and between group A and group B.In group B,the biliary wall was thickened and the lumina of bile duct widened,favorable tenacity of broaden biliary tract was shown.The specific staining of the broadened biliary wall showed that collagen and elastic fibers compacted fine and close and there was no breakage.Conclusion Dilated local bile duct constructed by increasing internal pressure of local bile duct has thick wall,wide caliber and its collagen and elastic fibers compact fine and close.This provides condition to supply early-stage cholangio-jejunostomotic reconstruction of bile duct iniury and create wide stoma for cholangio-jejunostomy in dogs.