关键词: 皮肤切口, 缝合界面, 界面力学, 数字图像相关法

Abstract: In order to study the mechanism of the geometric structure of the wound interfaces on the tensile failure behaviors of the skin sutures, a fractal interlocking mechanism was developed based on the tensile failure behaviors of the skin suture interfaces. The fractal design of skin interface was carried out according to Koch interlock model, and the equivalent mechanics model was constructed for the interface with linear and sinusoidal center line distribution. Combined with numerical simulation and digital image correlation method, the tensile tests were carried out on the prepared suture structures, focusing on the progressive destructive behaviors of second-order tooth skin suture structures, and the effects of tooth sharp angle, fractal order and center line distribution on their tensile properties were further explored. Finally, taking tensile strength as the evaluation index, the parameter mapping model of each sensitive factor was constructed. The results show that the failure behaviors of the second order tooth interface are manifested as the load transfer from both sides of the tooth to the interface layer of the middle tooth, resulting in the uniform loss of the second order tooth. Smaller tooth angle and higher fractal order may improve the tensile properties of the skin interfaces, and the distribution of sinusoidal centerlines may make the structure have greater tensile strength. This paper may provide relevant reference for improving the healing rate of skin wound after clinical suture. 

Key words: skin incision, suture interface, interface mechanics, digital image correlation method