Design And Implementation Of Pedicle Screw Surgical Training System Based On Haptic Feedback Algorithm

The surgical system based on virtual reality used visual and tactile feedback mechanisms,which can provide the training trainer with a very immersive training environment,improving the training effect and shortening the training cycle of the trainees.It has important research significance and practical value.In this paper,based on the analysis of nail placement accuracy and system-related functional modules of pedicle screw surgery training,the overall framework design of the system is completed;the use of triangular mesh optimization algorithm to simplify the number of grid,and the use of surface rendering algorithm to achieve the vertebral arch The reconstruction of the root bone was designed to complete the collision detection between the bone and the drill bit;the drilling model and the twist drill parameters were analyzed;the tactile feedback algorithm for bone drilling was designed and implemented;finally,the software design implementation and testing of the entire system was completed.The innovation of this paper lies in designing and optimizing the haptic feedback algorithm of pedicle screw.By using the gray data of bone CT to replace the density data of the original force model,the real-time force signal feedback in the drilling process is realized.The generated force signals are more timely and accurate;in addition,in the reconstruction of bones and other models,the optimized partial center of gravity metric edge folding triangle mesh simplification algorithm is used to realize the reduction of the number of triangular meshes of the skeleton model,and the area is improved.Draw the speed of the reconstruction of the algorithm model.The main research work of this article is as follows:(1)The pedicle screw surgery training system based on virtual reality haptic feedback technology is completed and analyzed.According to the difficulty of pedicle screw surgery,the functional requirements of the system were analyzed,three-dimensional reconstruction module of pedicle screw surgery,collision detection module,haptic feedback module and surgical training navigation module were designed.The overall framework of pedicle screw surgery training system was completed.(2)Designed and implemented a system of three-dimensional reconstruction and collision detection function module.By reducing the number of triangular meshes based on the local barycenter metric edge folding algorithm and reducing the time of three-dimensional reconstruction of the model,the AABB algorithm of axial parallel bounding box is optimized by using the z-cache and other techniques to improve the efficiency of collision detection between models.(3)The design implements a tactile feedback algorithm for force-action interaction.Through the analysis of the model of drill bone drilling force,the force model of twist drill drilling was deduced.The difference between the feedback force and the traditional use of the general data of bone density was calculated.The density parameters were replaced by the algorithm model in this paper.CT real bone grayscale data makes force feedback information more real-time and accurate.(4)Completed the software design implementation and testing of the pedicle surgery training system.On the basis of the overall architecture and overall functional design of the pedicle screw surgical training system software,the three-dimensional reconstruction of the pedicle screw operation interface design,pedicle bone and other models and the virtual realization of the surgical procedure were completed,and the system function module was completed.taking the test.