Low temperature thermoplastic material

Abstract

The invention relates to a medical polymer material, in particular to a polymer thermoplastic material. The polymer thermoplastic material is composed of 60-90 parts of polycaprolactone, 0.1-5 parts of a crosslinking assistant, and 10-50 parts of filler. The production process steps include: 1. material mixing, 2. granulation, 3. extrusion / injection molding, 4. punching and cutting, and 5. irradiation at an irradiation dose of 0.1KGy-20KGy. If the irradiation is less than 0.1kGy, the crosslinking is insufficient, and operation after heating is inconvenient, if the irradiation is greater than 20KGy, the elongation at break of the material is too low, and the material fractures easily. The thermoplastic material provided by the invention can be softened and molded into arbitrary shape at lowtemperature, can restore the hardness and strength of plastic itself after cooling, and has the advantages of light weight, strong plasticity, certain strength, strong X ray permeability, good memory, strong repeat mouldability, no irritation to skin and easy rapid degradation in soil after abandonment, thus being an ideal medical external fixation material. The low temperature thermoplastic material provided by the invention is mainly used for fixation of radioactive therapy, bone surgery fixation, making of orthopaedic and rehabilitation braces, etc.

Description

technical field [0001] The invention relates to a medical polymer material, in particular to a polymer thermoplastic material. Background technique [0002] The low-temperature thermoplastic sheets currently on the market are generally made of polycaprolactone as the main raw material. The melting point of polycaprolactone is only 60°C. It has a certain strength below 60°C, but it softens rapidly in a water bath above 60°C. After taking it out of the water bath, the temperature can quickly drop to about 45°C and continue to maintain a softened state. Shaped and does not cause harm to the patient's skin, it is very suitable as an immobilization material. However, polycaprolactone itself also has some defects. It softens too quickly above 60°C. If it is heated for a long time, it will sag due to gravity, and even cannot maintain its shape. If it is not handled properly, it may stick together and cannot be used. In addition, its strength at room temperature is suitable for im...

AI Technical Summary

Problems solved by technology

However, polycaprolactone itself also has some defects. It softens too quickly above 60°C. If it is heated for a long time, it will sag due to gravity, and even cannot maintain its shape. If it is not handled properly, it may stick together and cannot be used.

In addition, its strength at room temperature is suitable for immobilization of fingers or upper limbs, but it is still slightly insufficient for lower limbs or trunk, and there is a certain gap compared with plaster

Finally, polycaprolactone is a special polymer material, and the current price is high, so the low-temperature thermoplastic board made is also expensive