Finite Element Analysis And Structural Optimization The Prosthetic Socket Of Lower Leg Based On Dynamic Analysis

Prosthesis receiver cavity is an important part of prosthesis.It connects with human body to transmit force and then controls the movement of prosthesis.The functional prosthetic socket must be comfortable to wear,capable of force transfer and control.However,due to the control performance of the prosthesis,the rigid requirements on the interface of the residual limb and the flexible requirements on the interface of the residual limb and the comfort of the wearer are contradictory.Therefore,the research of prosthesis receiver cavity has always been the key point in the development of prosthesis design.In order to improve the adaptability of the receiver cavity,the interface stress between the residual limb and the receiver cavity was analyzed to understand the stress distribution law on the surface of the residual limb,so that the interface between the receiver cavity and the residual limb could not only satisfy the transfer function,but also avoid the residual limb soft tissue from bearing a load that did not exceed the safe pressure value.In order to solve the contradiction between the residual limb and the receptive cavity interface,the comfortableness and function of the patient wearing prosthesis were improved.In this paper,by collecting the variation value of knee joint Angle in one motion cycle of unilateral lower leg amputee walking on flat ground,the force and moment of knee joint in one motion cycle are calculated by using the inverse kinematics method and Adams simulation software.Numerical analysis was used to analyze the dynamics of the residual limb-receptive cavity interface.According to the characteristics of the residual limb soft tissue biomechanics,the analysis of a gait cycle,the stress distribution of the residual limb soft tissue suffered verify whether conform to the requirements of the biomechanics of the human body,and on this basis to accept cavity structure optimization,make accept cavity on the basis of the accord with human body biomechanics to make patients gait more close to normal human gait patterns.Results and conclusion: The experimental results show that the interface stress of the optimized prosthetic socket does not exceed the soft tissue load bearing capacity,and the patient’s gait is improved,close to the normal human gait pattern.It is proved that the finite element simulation is effective in optimizing the design of the receiving cavity and can improve the comfort and functional transfer of the interface of the receiving cavity.