Study on digital image correlation method of skin flap suture reduction
To study the influence of different local skin flap suture methods on the strain of skin flap suture and determine the best scheme of local skin flap suture,the experimental measurement and characterization technology of bionic skin suture large deformation field were studied.Firstly,a non-contact full-field strain measurement system was established to characterize the hyperelastic constitutive relationship of bionic skin materials under quasi-static uniaxial tensile test.Then combined with digital image correlation system,bionic skin suture experiment was carried out.The effects of rotation,propulsion and transposition on the suture force of the skin flap after wound suture were studied.The displacement field and strain field of the skin flap after suture were obtained,and the strain concentration effect near the suture line was analyzed.Finally,the Von Mises equivalent stress in the suture area of skin flap was quantitatively solved based on the Mooney-Rivlin hyperelastic constitutive model of bionic skin material.The results show that rotation suture delivers the best performance among the three methods of skin flap suture,and the maximum stress in the suture area is the lowest,and the maximum stress decreases with the increase of the wound diameter.The stress concentration of skin flap suture mainly appears near the wound suture line.This paper further discusses the effect of suture tension on strain concentration in the peripheral area of wound suture,and the results of this study can provide a reference for reducing the tension of local skin flap before plastic suture.
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