Force Feedback Interaction Of Arthroscopic Meniscus Virtual Surgery

Thanks to the wide application of minimally invasive endoscopic surgery in the medical field, more and more patients prefer this operation to traditional open surgery. Because of the difficulty of minimally invasive operation, the lack of primary doctors’ training method and the long cycle, the minimally invasive surgery is limited. Virtual surgery simulation system is a new application of virtual reality technology in the field of modem medicine, providing a new means for surgical training and preoperative rehearsal, it has the characteristics of strong interactivity, real-time, deep immersion. At present, the research of virtual surgery simulation system has become the focus in the fields of international biomedical engineering, computer simulation and so on.Arthroscopic meniscus surgery is one of the most common arthroscopic surgery, the requirement of doctor’s hand eye coordination is high. Force feedback interaction is one of the key content of virtual surgery research, and the operator can feel the force/touch of virtual scene and make real-time and accurate response by force feedback technology. This paper has developed a virtual knee arthroscopic meniscus operation interactive system based on force feedback device design and force interaction. The main contents of the research are as follows:(1) Analysis on design and motion control of interactive device. According to the operation features and functional requirements of the knee arthroscopic operation, the structure design of the interaction device is accomplished, the movement characteristic of the device is analyzed, and the system control scheme is given.(2) Physical model and feedback force calculation of meniscus. The biomechanical characteristics of meniscus is analyzed, the physical model of meniscus in virtual operation system is determined, and the deformation of the model is analyzed. The visual frequency is different from the tactile frequency, but they are in the respective refresh cycle. In this paper, the structure diagram of data communication between simulation and touch is presented, and the method of calculating the feedback force after the model is also given.(3) Force feedback scene interaction design. The research content includes the interactive control flow chart, the connection software and hardware interface and the virtual model movement demand analysis. In the process of model interaction, selecting the appropriate collision detection algorithm, and processing and feedback the haptic information.(4) Development of virtual meniscus operation system. The framework and functional modules of virtual meniscus surgery system is introduced, the virtual knee arthroscopic meniscus operation system with force feedback function is developed by using medical simulation software SOFA, and the surgery simulation is ultimately achieved, which can meet the training needs of the arthroscopic knee surgery.