以函数为描述方式观察实验动物臂丛神经的应力松弛特性

Stress relaxation characteristics in brachial plexus of experimental animals using function as description method

背景:臂丛神经损伤缝合吻接有必要了解臂丛神经应力松弛力学特性。以往的研究多以臂丛神经的单项拉伸力学性质研究居多,关于臂丛神经应力松弛、蠕变黏弹性力学性质的报道较少。目的:以函数为描述方式观察分析实验动物臂丛神经的应力松弛力学特性,为临床提供实验参数。设计、时间与地点:以函数为描述方式的单因素观察性实验,于2007-03-01/10在吉林大学力学实验中心完成。材料:雄性6月龄SD大鼠由长春市高新医学动物实验中心提供。方法:在日本岛津电子万能试验机上对大鼠臂丛神经进行应力松弛实验,应变增加速度为1%/s,设定时间为7200s,采集100个实验数据,以一元线性回归分析的方法处理实验数据。主要观察指标:应力松弛数据和曲线,应力与时间的变化规律。结果:实验动物臂丛神经试样7200s应力松弛量为0.316MPa。应力松弛曲线是以对数关系变化的,应力松弛最初600s变化较快,之后应力缓慢下降,达到7200s曲线基本平衡。结论:应力松弛曲线是以对数关系变化的,臂丛神经具有黏弹性力学特性。

BACKGROUND： The brachial plexus injury anastomosis suture technique is necessary to understand the mechanics characteristic of brachial plexus nerve stress relaxation. Previous studies mainly focused on single tension mechanics of brachial plexus nerve, but few studies concerning stress relaxation and creeping elasticity. OBJECTIVE： To observe and analyze experimental animal brachial plexus nerve stress relaxation mechanics characteristic in the description manner of function, to provide experimental parameters for clinic. DESIGN, TIME AND SETTING： The experimental observations to use function as a way to describe from 1st to 10th March, 2007 at the Experimental Center of Jilin University. MATERIALS： The experimental male Sprague Dawley rats aged 6 months were provided by Changchun Gaoxin Medicine Animal Experimentation Center. METHODS： The stress relaxation experiment was performed in Experimental animal Brachial plexus Nerve on the the electronic universal testing machine （Shimadzu, Japan）. The stress relaxation experiment strain increased speed was 1%/s, setting time of 7 200 seconds. 100 empirical data were collected and disposed by one-way linear regression analysis. MAIN OUTCOME MEASURES： The stress relaxation data and curve, the Stress and time change rule were measured. RESULTS： The stress relaxation quantity of animal brachial plexus nerve test specimen at 7 200 s was 0.316 MPa. Stress relaxation curve changed with logarithm. Stress relaxation changed rapidly at 600 seconds, decreased gradually, and reached a balance level at 7 200 seconds. CONCLUSION： The stress relaxation curve changed with the logarithm relations. Brachial plexus has visco-elastic mechanical properties.