The painstaking research and accumulation of practical experience by domestic and foreign medical experts have resulted in a series of new external fixation materials and technical applications, especially splints made of synthetic materials, such as fiberglass splints and polyurethane splints. , resin splints, inflatable splints, etc. These splints have been significantly improved in terms of material selection, production technology and flexible application of mechanical principles, and have also received good clinical therapeutic effects.