Cryogenic thermoplastic sheet is a special synthetic polymeric polyester with the chemical name trans-polyisoprene. It is a new type of medical material which is processed by a series of chemical polymerization methods. It can be used for the production of orthopedic external fixation, orthopedic apparatus and support material. It is the most ideal external fixation material for radiotherapy positioning because of its non-absorbing radiation, good shaping effect after heating and softening, and unique shape memory function (when the shaping is unsatisfactory, it can be heated twice and shaped again or partially heated again), as well as simple operation and convenient fixation. 1.Fixation of fracture and joint dislocation after repositioning; fixation of soft tissue injury such as joint ligament and nerve tendon injury after surgical treatment. 2.Fixation after orthopedic surgery for joint deformity, nerve palsy and tendon injury. 3.Fixation of acute and chronic inflammation of joints, acute inflammation of limb soft tissues. 4.Fixation of bone and joint tuberculosis, acute and chronic osteomyelitis, septic arthritis, primary bone tumor, malignant tumor bone metastasis during conservative treatment or after lesion removal. 5.Fixation after burn injury and other plastic surgery. 6.Production of rehabilitation brace and orthopedic brace. 7.Fixation of radiotherapy positioning. Here is a brief introduction to the application of orthoses made of low-temperature thermoplastic plates in upper limb diseases: a rheumatic, rheumatoid arthritis treatment: Second, the functional position of the upper limb with orthoses: Third, the correction of cone finger, goose finger deformity: Fourth, the application of peripheral nerve injury grip class orthoses: Fifth, the upper limb flexor rupture training with orthoses: low-temperature plate orthoses in the upper limb diseases and many other applications The main role is to relieve and control the deformity, maintain the functional position of the upper limb, reduce tension and assist in completing some of the lost functions of the upper limb. In clinical use, cryogenic plates are lightweight, quick and easy to make, easily accepted by patients, and do not have some of the disadvantages of traditional plaster, although the cost is more expensive than plaster, but for functional recovery and compensation is not plaster can be compared.