Design And Implementation Of Prosthetic Socket Matching And Generating System

A prosthetic limb is usually made up of three parts: the supporting part that mimics the function of human body and can bear the weight of human body,the decorative part that mimics the shape of human body and the prosthetic socket.As the biomechanical interface between the body and the prosthesis,the prosthetic socket is the direct connecting medium between the body and the prosthesis.The force between the human body and the prosthesis is transmitted through the contact surface of the stump and the socket.Therefore,the design of prosthetic socket is directly related to whether the user can wear comfortably and walk stably.The traditional manual fabrication of prosthetic socket has the disadvantages of low efficiency,long fabrication cycle,low flexibility and too high cost.With the rapid development of Computer Aided Design and Manufacturing(CAD/CAM)technology in recent years,people begin to try to use computer aided socket design,in conjunction with the mature 3D printing technology,in order to increase the rate of making the socket at one time.This paper uses OpenSceneGraph and PCL to design and implement a prosthesis socket matching and generation system based on the Qt framework in Visual Studio.The system can deal with the point cloud model and triangular mesh surface,mainly includes reading and visualization of point cloud data,calculation of point cloud model girth,adaptive slicing of point cloud models and establishment of mathematical models,model matching,point cloud surface reconstruction,surface boundary extraction,surface offset,surface thickening and other functions.The main input of the system is the point cloud file obtained by the 3D scanner scanning the surface of the patient's residual limb.The system can match the residual limb point cloud model with the most suitable socket model in the socket database.If the matching is successful,the socket model that can be recognized by the 3D printer is output.If the matching fails,the point data of the patient's residual limb can be directly used to generate the socket model that can be recognized by the 3D printer.The socket model matched or generated by the system is consistent with the shape of the patient's residual limb,while meeting the accuracy requirements,it can shorten the production cycle and reduce the production cost.