大鼠和兔胃的张力和应力依赖于部位和方向

目的确定大鼠和兔胃组织条的单轴压力-应变特性,研究胃的零应力状态。方法纵向组织条(平行于小弯)和环形组织条(垂直于小弯)取自胃底(腺性部分)和前胃(非腺性部分)。根据零应力和无载荷状态长度的变化计算残余应变,应用张力拉伸仪进行应力-应变实验。从数字图像测量每个组织条的厚度和宽度,从组织条得到的数据与从体外完整胃得到的数据进行比较。结果胃腺性部分的残余应力和残余应变比非腺性部分大,大鼠胃的残余应力和残余应变比兔大。就应力-应变而言,腺性部分比非腺性部分硬,纵向腺性部分比环向腺性部分硬,大鼠胃组织条比兔胃组织条硬。从组织条得到的数据与从体外完整胃得到的数据有可比性,从而表明所获得的实验数据在生理范围内。结论大鼠和兔胃的张力和应力依赖于部位、方向和种属。由于胃的几何形状复杂,应用影像技术和机械数据进行三维图像重建所获得的数据对于全面评估胃的功能非常重要。

Tension and Stress in the Rat and Rabbit Stomach are Location-and Direction-Dependent

Objective The aim of this study was to determine uniaxial stress-strain properties of gastric strips obtained from rats and rabbits. we aimed to study the gastric zero-stress state.Methods The residual strain was computed from the change in length between the zero-stress state and no-load state. The stress-strain test was performed using a tensile test machine. The thickness and width of each strip were measured from digital images. The strips data were compared with data obtained in the intact stomach in v...