Mechanical Characteristics Of Human Upper ARM Soft Tissue In Vivo

Human skin and organs are the subject of many areas of research or research,virtual surgery,minimally invasive surgery,robot-assisted injection,cosmetic surgery,scald repair and other medical fields.It is necessary to analyze the mechanical properties of the corresponding parts of the human body.Muscle spasm(tension)when the mechanical properties change,while the relaxation and tension of the two state of mechanical properties analysis can be a more comprehensive understanding of the human body soft tissue.Different parts of the body soft tissue differences,the corresponding parts of the mechanical properties of different parts of the existence of a huge difference.Need for different parts of the human body for specific research and analysis.The soft structure of the human body arm is very complicated.Previous studies have performed experiments in vitro or in animal specimens to reflect the mechanical properties of human tissue.However,in vitro samples have no physiological activity,cannot accurately reflect the physical behavior of the human body behavior,and animal data cannot replace the body's mechanical information.In this paper,the use of MRI magnetic resonance imaging technology of the pressure test,and through the finite element analysis of the arm,the mechanical properties of soft tissue layers were analyzed.This method solves the difficulty that the in vivo experiment cannot obtain the multi-layer soft tissue data.In this paper,the widely used hyperelastic model is used to describe the soft tissue in the arm region,and further assume that it is approximately incompressible to achieve the described accuracy.The main purpose of this paper is to identify and identify two hyperelastic model parameters of each layer of soft tissue,provide reference data for the human body's mechanical parameters,and facilitate accurate scientific research or application in relevant fields.The aim of this study is to study the nonlinear mechanical behavior of bio-active human arm with multi-layer soft tissue by finite element analysis(FEA).In order to analyze the mechanical properties of the arm in the relaxed state and all the soft tissue layers under tension,this study performed a press test on the upper right arm of a young man.The experiment was performed in a magnetic resonance imaging(MRI)environment.And three-dimensional reconstruction of the soft tissue including skin,subcutaneous tissue and muscle were obtained by MRI reconstruction.The model of the humerus was established in order to ensure the integrity of the arm.Simulation of printing pressure test using FEA.The Neo-Hookean model of two material constants(C10,D1)is used to simulate the mechanical behavior of the soft tissue of the arm,subcutaneous tissue and muscle.The identification of the material model parameters is carried out by the combination of the screening method and the NLPQL algorithm in ANSYS Workbench.Our recognition method determines the corresponding range of values for each constant.The main contents of this study include the following aspects: According to the environment of nuclear magnetic resonance imaging equipment,the design can be used in this environment,the pressure test device.In the course of the experiment,the indenter is maintained vertically and the weight of the tissue is equal to the pressure.The deformation data of the soft tissue layers under pressure were measured by Mimics medical software for MRI images.The 3D reconstruction of each soft tissue layer is carried out on 2D images.A series of magnetic resonance scanning images were processed to establish their digital geometric model and finite element model.The mechanical parameters of the soft tissue of the arm are identified and determined by the finite element method and the NLPQL algorithm combined with the screening method.