Key Technologies Of Simulation System For Knee Surgery Based On Haptic Feedback

The technology of virtual-surgery is the integration of computer graphics, modern medicine and virtual reality technology as a multidisciplinary research area which plays an important role in the field of programming and treatment of surgery, the practice of surgery, navigation and wardship during the surgery time. The feedback device satisfy the virtual surgery’s requirements of realism and immersion. Therefore, the research of virtual surgery based on feedback technology has become a hot research in this field.Using the haptic device Phantom Desktop, the key technologies of simulation for arthroscopic knee surgery based on haptic feedback are researched, and also the realization of deformation and cutting operation are discussed. Firstly, the principle of haptic feedback are discussed, and the haptic feedback system with Phantom Desktop equipment is constructed, also the feedback force and the surface texture are simulated with the models of spring-damp and stick-snage. Secondly, with the image data from CT and MRI of human knee, three-dimensional reconstruction of the knee joint is conducted, including the knee bone, meniscus, ligament and skin which belongs to different anatomical levels. Thirdly, the collision detection based on the bounding box cut algorithm is realized, and the direction determined focusing on puncture issues is improved. Additional, based on the model of mass spring, the model motion state is solved, through analysising the particle’s force situation. And the deformation simulation based on OpenGL and STL format is implemented. Also the deformation effect is obtained through analysising deformation parameters. Finally, the cutting conditions and cutting path of virtual knee surgery are discussed, and the cutting process on the virtual skin of knee is realized by meshing and reconstruction.The results of experiment show that the haptic feedback system built has favorable operation capability, the three-dimensional model of human knee joint created is detailed and credible, the algorithm of collision detection improved reduces the occurrent probability of puncture which improves the accuracy of collision detection, and the implement of deformation and cutting processes has a good realistic effect.