摘要
本实验研究的目的在于观察皮肤软组织快速扩张后生物力学特性的改变,并与常规扩张、未扩张的皮肤进行对比研究,以了解扩张皮肤生物力学特性的改变与扩张速度的关系,即扩张皮肤24小时应力松弛的程度和应力状态的平衡与一周应力松弛和平衡的区别,为临床快速扩张提供生物力学的研究基础。取4只体重为15kg 左右的猪为实验动物,分为常规扩张组,快速扩张组和对照组;将容量为240ml 的矩形扩张器埋置于筋膜下,按分组要求定期给予扩张;扩张结束后取标本进行皮肤构关系、应力松弛特性、应变能密度和强度参数等生物力学指标的测定,结果表明扩张皮肤的粘弹性明显下降,有别于未扩张的皮肤,而快速扩张皮肤与常规扩张皮肤的粘弹性的下降则非常相似。因此,扩张可致皮肤粘弹性下降,但扩张皮肤粘弹性的下降除与扩张刺激的强度有明显的关系外,尚与扩张刺激的间隔时间有关,但后者的影响较小。临床上可以采用快速扩张的方法,以缩短疗程,提高疗效。
The purpose is to evaluate the biomeehanieal properties of conventional skin expansion,rapid expansion and unexpanded skin.In four pigs,240ml expanders of square shape are placed.The flaps are divided into three groups:①Rapid expansion flap:the ex- pander is inflated daily until maximum volume is obtained.②Conventional expansion flap: inflation is done weekly.③Unexpanded skin is used as control.By using the tensometer,the skin is evaluated for stress strain,stress relaxation,density of strain energy,parameters of strength,and a mathmetieal model is obtained. We conclude that the biomeehanical propreties of the expanded skin are different from that of the unexpanded skin.But the biomechanical properties of conventional expanded skin are similar to that of rapid expanded skin.It is shown that the rapid expansion may be ac- cepted in the practice.
