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Establish 3-D Finite Element Models for Local Skin Flaps and Find Their Biomechanical Law by Model Simulation and Analysis

Author: ZhangZhao
Tutor: ZuoJie；LiYanSheng；JingZuoJun；MuLanHua；FanFei
School: Beijing Union Medical College
Course: Surgery
Keywords: Local flap Skin biomechanical properties Finite Element Analysis Computer-aided design
CLC: R622
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 0
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Abstract


Objective obtain biomechanical parameters of human skin. Simplified model of three-dimensional finite element commonly used in clinical four local flaps and local flaps three-dimensional finite element model. Analog local flap surgery area surgery, post-operative skin deformation. By simulating find local flaps, the mechanical stitching process variation auxiliary clinical preoperative flap design, to improve flap utilization, reduce complications. 2. The method utilizes surgical abandoned human skin specimen skin biomechanical parameters determination tests. Using three-dimensional finite element software MSC.Marc / Mentat 2005 to establish three-dimensional finite element model of the local flap simplified three-dimensional finite element model including four clinically used local flaps: advancement flap model of rotation flap model The rhomboid flap model, \To obtain three-dimensional images of three-dimensional scanning using a three-dimensional image manipulation software Geomagic Studio 8.0 and three-dimensional finite element software MSC.Marc / Mentat 2005 to establish the true cases of partial flap three-dimensional finite element model of the skin of the patient's surgical area. Various flap model the skin biomechanical parameters into the establishment, the by applying precise displacement of the nodes on the model value analog displacement of each flap surgery, suturing process, calculation of the deformation of the skin in the surgical area of ??internal displacement constraint release calculate the the postoperative regional skin stress incision tension, draw the corresponding stress, tension contours. For the same type of local skin flap model, by varying the incision location, defect range, skin material properties, comparative analysis of the impact of these factors on postoperative results. The results based on test data to map out the human skin stress - strain curve. The local flap three-dimensional finite element model simulation results nephogram way to map out local flap surgery intraoperative and postoperative regional skin displacement map, stress magnitude and distribution of incision tension and maps. Change incision location, defect range, the material properties of the skin peptide analog local flap postoperative results show: 1) the local advancement flap flap elongation ratio of more than 50% of the plastic deformation exceeds the yield limit. 2) The central angle of 60 ° fan rotation flap when the the flap rotational angle exceeds 30 ° may exceed the yield limit of plastic deformation. 3) an angle of 60 °, a modification of the \4) using the material parameters of human forehead skin the local flap model after maximum regional stress value of the largest incision tension value should be significantly higher than the local skin flap model of the shares before the District leather peptide material parameters. 5) the local flaps 3D finite element simulation model can accurately simulate predict a patient's skin deformation, tension distribution. Conclusion human skin stress - strain curve is nonlinear relationship. , Partial advancing flap elongation ratio should be controlled in the range of 40% in the case of not consider revascularization. Without considering the blood supply, the central angle of the sector of 60 ° the flap rotation angle of the rotation flap should not exceed 30 °. Change for the \Different parts of the skin, even if the design of the incision is completely consistent regional skin blood for postoperative survival rate may also vary greatly. The design scheme of the surgical area of ??the surface profile and the cutout is to determine the the the local flap postoperative stress distribution direction, incision tension factors concentrated area, irrespective of the material parameters of the skin. The use of three-dimensional finite element method and human skin biomechanical parameters simulation analysis of local flaps is feasible. Personalized irregular local skin flap model can accurately simulate predict patients with skin deformation, tension distribution.

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CLC: > Medicine, health > Surgery > Plastic Surgery (repair surgery ) > Plastic surgery school
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