Abstract: A positioning device for radiotherapy, includes a first frame, a degradable low-temperature thermoplastic film and a degradable second frame. The second frame is connected to an outer edge of the low-temperature thermoplastic film, and a softening point of the second frame is higher than a softening point of the low-temperature thermoplastic film. A mechanical strength of the first frame is greater than a mechanical strength of the second frame, and the first frame and the second frame are detachably connected through a first connecting structure. When in use, the positioning device for radiotherapy in the disclosure has satisfactory rigidity and mechanical strength for positioning, and effectively avoids waste and environmental pollution since the second frame and the low-temperature thermoplastic film that are non-reusable are degradable and the non-degradable first frame is reusable.

Abstract: A low temperature thermoplastic material is provided. The components include in weight parts: polyurethane with a melting point of 50-70° C. 90-10 parts, poly(?-caprolactone) 0-90 parts and cross linking co-agent 0.1-6 parts. Compared with the prior poly(?-caprolactone) low temperature thermoplastic material, the present low temperature thermoplastic material has a smaller shrinking force and a better fastening intensity, is more comfortable and can be stretched more uniformly after molding. Therefore, the material is suitable for hospital and other radiotherapy institution and can be used compatibly with three-dimensional conformal radiotherapy equipments in tumor surgery.

Abstract: A low temperature thermoplastic material is provided. The components include in weight parts: polyurethane with a melting point of 50-70° C. 90-10 parts, poly(?-caprolactone) 0-90 parts and cross linking co-agent 0.1-6 parts. Compared with the prior poly(?-caprolactone) low temperature thermoplastic material, the present low temperature thermoplastic material has a smaller shrinking force and a better fastening intensity, is more comfortable and can be stretched more uniformly after moulding. Therefore, the material is suitable for hospital and other radiotherapy institution and can be used compatibly with three-dimensional conformal radiotherapy equipments in tumor surgery.