Study On Digital Design Of Receiving Cavity Of Calf Prosthesis

Prosthetics are important tools for compensating limb function and helping patients with residual limbs to reintegrate into society.However,due to the important part of the prosthesis,the receiving cavity still needs to be manually designed to make it expensive,which is difficult for ordinary people to afford.Therefore,it is of great social significance to reduce the manufacturing cost of artificial limbs and optimize the manufacturing process of the receiving cavity.In view of the current high production cost of the prosthetic socket and excessive dependence on the technical level of the production staff,based on the research of domestic and foreign scholars,taking the calf prosthesis with the largest number of amputees as an example,CT scan technology is used to obtain the shape of the calf residual limb.Combining with image processing,three-dimensional simulation and finite element analysis techniques,the digital design of the receiving cavity of the leg prosthesis is studied to optimize the repair process of the receiving cavity.The main research content is as follows:(1)Receiving cavity digital design program.According to the physiology and anatomy of the residual limb,the biomechanical characteristics of the tissue structure of the various parts of the residual limb were analyzed,and the surface of the residual limb was partitioned according to the subcutaneous tissue to determine the main bearing area and the non-load bearing area,and combined with Rogers-Wilson's curve,setting The upper limit of the residual limb surface pressure.Finally,in combination with computer technology and rapid prototyping technology,the digital design scheme of the receiving cavity is designed in light of the insufficiency of the traditional prosthesis receiving cavity manufacturing process.(2)Residual limb and receiving cavity finite element model.Firstly,CT scan technology was used to acquire stump shape data,and then image processing was performed.The ray projection algorithm was used to perform three-dimensional reconstruction and a three-dimensional model of the stump and the receiving cavity was obtained.Then for the three-dimensional model meshing,get the residual limb and the receiving cavity of the finite element model.(3)Analyzing the force of the residual limb during the gait cycle.Analyze the process of human walking,calculate the force of the residual limb during the gait cycle,and accurately assign the residual limb material properties based on the gray value,and then use finite element simulation analysis to obtain the interface pressure of the residual limb during the gait cycle.(4)The combination of trimming and finite element simulation of the positive model.The effect of residual limb trimming on the overall residual force of the residual limb was analyzed,and the residual limb model was trimmed based on the force condition of the residual limb during the gait cycle.The interface pressure of the trimmed residual limb is then analyzed to determine if the stress meets the design criteria and a receiving cavity model is obtained.Finally,the simulation results and experimental results are compared and analyzed to verify the feasibility of the solution.Based on the digital design and manufacturing of prostheses,this paper proposes a digitalized design and manufacturing scheme for the prosthetic leg and studies the key technologies.It can provide a certain technical reference for the digital manufacturing of the receiving cavity.