去细胞真皮基质的黏弹性研究

Viscoelasticity of porcine acellular dermal matrix

目的通过对比分析皮肤的物理参数值评价去细胞真皮基质的黏弹性性质。方法将清洁级日本大耳白兔背部皮肤进行3种不同的创面处理,分别为薄自体皮加上去细胞真皮基质移植到创面组(PADM组)、薄自体皮原位回植组(TS组)、正常皮肤真皮组(NS组)。对该3组皮片进行应力-应变关系的实验。结果从PADM、TS、NS 3组皮肤的应力松弛曲线、蠕变曲线和应力-应变关系曲线可知,在一定应力下,PADM组的应变最小,NS组的应变最大,TS组居于两者之间。结论皮肤的黏弹性力学模型是4参量黏弹性模型。用去细胞真皮基质作为皮肤替代物移植到皮肤创面后,该植皮的弹性较差,变形后的恢复能力也较差,与临床结果相符合。

Objective To evaluate the viscoelastic properties of porcine acellular dermal matrix （PADM） by com- parison and analysis on physical parameters of the skin. Methods Full-thickness skin defects were performed on the back of white rabbits as wound models, and randomly divided these wounds into 3 groups according to dif- ferent methods of skin grafting： PADM group （autogenous skin and PADM were grafted to the surface of the wound）, TS group （autogenous skin was grafted in situ）, NS group （normal skin as the control）. Experiments on the stress-strain relationship of the implanted skin in the three groups were conducted. Results The curves of stress relaxation, creep, and stress-strain relationship showed that under a given stress, PADM group had the lowest strain, NS group had the highest strain, while the strain of TS group was in between the PADM and NS group. Conclusions The skin viscoelasticity mechanical model is a four-parameter solid model. When the skin wounds are grafted by using PADM which may have poor elasticity, its recovery capacity after deformation is also poor, and this is in agreement with the clinical results.