Construction And Evaluation Of Spinal Surgery Simulation Training System Based On Accurate Force Interaction

Incorrect sitting and looking posture of the human body can easily lead to lumbar and cervical spondylosis,spinal stenosis and other spine diseases.Those with serious symptoms need to be treated surgically.However,operation of spine operation is difficult,space limitation is strong and safety requirement is high.Due to the restriction of teaching mode,it is difficult for doctors to master operation skills skillfully in a short time.Therefore,building a high immersion surgical simulation training system is one of the effective ways to build a safe,quality-assured and efficient orthopaedic training model.This paper focuses on force feedback accuracy,visual interaction authenticity and synchronization in simulation training of spine operation.The simulation training system for spine operation was analyzed and the authenticity of force and visual synchronization during the grinding process of the lamina was determined to be the main reasons affecting the user’s immersion.By analyzing the operation process and operation requirements of laminectomy and decompression,the human-machine interaction of simulation training system for spine operation is completed with VR interactive equipment and force feedback interactive equipment.To streamline the main operation steps of laminectomy and decompression,and design a special training module for lamina grinding to simulate the force sense of the process of lamina grinding.The mathematical model of grinding force of vertebral plate bones was established by semi-analytical method,and grinding force rendering between different bones was realized by using God-Object based rigid body force feedback calculation method.The removal process of rigid body model for different bones was tested and verified,and the feedback force instability between different bones was further optimized in the simulation process.Accurate voxel model reconstruction of patient CT data is performed based on ray projection algorithm.Improve the system’s rendering speed by optimizing the original DICOM files of human body.A prototype of spine operation simulation system based on precise force perception interaction was built,which can realize the interaction of operation process and grinding force perception feedback exercises of the lamina and carry out a systematic test to complete the simultaneous rendering of force perception and vision.By analyzing grinding force,speed and position information of different grinding methods,the evaluation method of force sense signal and corresponding grinding process is discussed.The work of this subject can provide theoretical basis for force feedback method based on rigid body material reduction simulation and provide reference for multi-dimensional sensory interactive synchronization rendering research.