Jian C, Wang G
Center of Biomechanics, Chongqing University, China.
Biomed Mater Eng. 1991;1(2):105-13.
Diseases of the bile duct system in the digestive system after surgery are common. In order to clarify the cause of these diseases, research on the diseases from a biomechanical perspective is increasing; however, the same cannot be said of biochemical research. In this paper, by using a new, well-devised testing apparatus, specimens extracted from the bile duct system of canine body are tested. The test data are analyzed using the finite deformation theory, and mechanical properties of the bile duct system outside the liver are investigated. The conclusions show that the viscoelasticity of the bile duct system is very small. In its normal physiological condition, the bile duct wall has an almost uniform distribution of circumferential and longitudinal stress. However, when the diseases of the bile duct system cause high pressure at the bile duct, the circumferential stress and longitudinal stress at the bile inside wall suddenly increase and are much larger than those stresses at the outside wall. The elastic modulus gradually becomes small from the common bile duct and the common hepatic duct to hepatic duct, and the value of elastic modulus for the cystic duct is almost equal to that of the hepatic duct.
消化系统手术后胆管系统疾病较为常见。为了阐明这些疾病的病因，从生物力学角度对这些疾病的研究日益增多；然而，生化研究却并非如此。本文通过使用一种新的、精心设计的测试装置，对从犬体胆管系统提取的标本进行测试。利用有限变形理论对测试数据进行分析，研究肝脏外胆管系统的力学性能。结论表明，胆管系统的粘弹性非常小。在其正常生理状态下，胆管壁的周向应力和纵向应力分布几乎均匀。然而，当胆管系统疾病导致胆管内压力升高时，胆管内壁的周向应力和纵向应力会突然增加，且远大于外壁的应力。弹性模量从胆总管、肝总管到肝内胆管逐渐变小，胆囊管的弹性模量值几乎与肝内胆管相等。
