Calen, the computer-assisted intelligent rehabilitation environment, is an intelligent integrated movement analysis and training system, and the Calen system can be customized in depth for different practical situations. Karen’s four core configuration modules represent the most cutting-edge intelligent rehabilitation technology: Module 1: Virtual Reality Video and Audio Spherical Stereo Environment From the 120 degree curved screen to the 300 degree dome screen, the virtual reality environment undertakes the main task of environmental simulation and information output. This immersive screen with surround sound system integrates the elements of “interaction” and “dynamic environment” into the patient’s regular rehabilitation training. In the Motor Learning concept, the guidelines that facilitate and guide rehabilitation: ambiguous training patterns, feedback, task orientation, and diverse training content, can all be implemented and enhanced by the VR screen. Module 2: The 6-dimensional motion platform and the dual-belt bi-directional dynamic running table are also one of the four core modules. Karen’s running table is the vehicle and data acquisition source for patients to train. Karen’s running platform features dual-belt, bi-directional and comprehensive coverage of 3D force plates. The running platform is erected on top of a 6-dimensional motion platform, which allows the running platform to perform 6-dimensional movements including forward and backward, left and right, up and down, pitch and tilt, rotation and swing in a three-dimensional space. It allows patients to experience different life scenarios and training scenarios such as road surface, crowded bus and seawater flat environment without leaving the hospital and with adequate safety protection. In addition, the dual-belt independent control provides a new way of training for hemiplegic patients, and the adaptive technology of the running platform allows trainers to train on the running platform with a more natural gait. Module 3: Motion capture and human motion model analysis system Motion capture system is another major source of data collection in addition to the Karen running platform. Motion capture system is equivalent to Karen’s eyes, Karen through them to real-time access to the patient’s movement, analysis to get the joint angle, speed, torque and other parameters, while using the powerful human body model software Human Body Model (HBM) modeling to achieve real-time visualization of muscle exertion, and can be used with the VR screen in Module 1 for feedback-based training. Module 4: D-Flow is the command center and brain of Karen’s four core modules – D-Flow Visual Rehabilitation Programming System. For example, D-Flow obtains motion data from the Karen Running Table module and the Motion Capture module, processes and analyzes it to generate a standard model of the human body that changes in real time through HBM, and outputs the biomechanical data to the VR screen so that patients can see real-time muscle force and joint motion data for every movement they make. The data from the VR environment in the game application also flows into D-Flow, which adjusts the angle of the running table in real time according to the changes in the environment, thus synchronizing the 6-dimensional running table with the bumps, ups and downs, and swaying environment to restore the most realistic training scenario. The same principle can also add EMG, EEG and other electrical signal capture devices to D-Flow to achieve the integration of scientific functions. And all this sounds tedious and complicated operation actually does not require complex programming skills, but through the visualization of the module click to add the content you want to integrate into the Karen inside. In addition to the above four core modules, in terms of safety, the Karen system incorporates multi-functional handrails for running tables, patient fall prevention suspension devices, and emergency stop switches to ensure that patients can put all their energy into their training without worrying about safety issues, while dedicated servers and service cabinets ensure the safety of patient data. In terms of applications, Karen also has a real-time/offline gait analysis module, a game application module including balance, gait, cognition and ADL training, an open self-programmed rehabilitation measurement and training module, a deeply customizable patient living environment and living city module, and an open sports research application module. Powerful hardware and software functions bring rich training application scenarios and a wide range of applications. Karen can help patients train different goals at each stage of rehabilitation in the early, middle and late stages. At the same time, Karen can be applied to almost all patients in neurological, orthopedic and cardiopulmonary rehabilitation, patients in sports, psychological and military rehabilitation, adult and pediatric patients. The value embodied by the Kalen system is not only in the patient training end, as a representative of cutting-edge virtual reality rehabilitation therapy, the arrival of Kalen will make the hospital or university an international-level rehabilitation and training venue. In addition to the ensuing international-level rehabilitation communication and academic conferences to enhance the brand value and influence, it will also attract top experts and talents to contribute to both the rehabilitation treatment and research ends. At present, Karen’s users include world-class hospitals, rehabilitation centers, university laboratories, etc., such as Doran Military Rehabilitation Center in the Netherlands, Sheba Rehabilitation Center in Israel, MIT Lincoln Laboratory in Boston, University of Pittsburgh, Brooke Army Medical Center in the United States, Bayi Rehabilitation Center in Sichuan Province, China, McGill University in Canada, Ottawa Hospital Rehabilitation Center in Canada, University of Skelaid in the United Kingdom, etc. High-end users make up the existing Karen world, and Karen as the bond that binds the various members together, communicating, sharing and growing. In the future, we also look forward to more Chinese members in the Karen family.