Release date: 2007-01-17
China has developed a new medical fixed material that can replace gypsum. The Changchun Yinghua Institute of the Chinese Academy of Sciences has successfully developed a shape memory function, which can be completely biodegraded. It has plasticity in warm water of 55-70 ° C. It is safe, convenient, clean and non-toxic. Side effects, a new type of medical external fixation material that can be reused. The expert group believes that this material is an alternative bone external fixation material for gypsum, and the material preparation technology has reached the domestic leading level.
The main component of the material is polylactic acid, which can be added with poly-γ-caprolactone, inorganic minerals (such as: calcium carbonate, titanium dioxide, talc, barium sulfate, montmorillonite), silane coupling agents, colorants and other components. . A copolymer of lactide (lla) and ε-caprolactone (cl) was used as a solubilizer for the blend of plla and pcl to prepare a warm water plastic medical fixing material. The material is made into a porous sheet or a porous mesh material and has good gas permeability and water resistance. It will not break, break, break, etc. when used. The product has high mechanical strength and good toughness. The x-ray transmission ability is strong, and the x-ray inspection does not require the removal of the fixing material. The bulk density is small, the bulk density is 0.9-1.2 g/cm3, and the amount of use is small, and the thickness of the sheet or mesh is usually 1-3 mm. Heated and softened in warm water for easy operation by doctors. Since the material has memory, it can be restored to its original shape by secondary heating to plastic temperature. It can be sealed and stored for a long time, and the waste can be completely biodegraded without any pollution to the environment.
Compared with the international pcl homopolymer, the price is low, the mechanical strength of the blend material is high, and the softening temperature transition can be adjusted to a wide range. It can be used without water heating. When the product is fixed, it can be heated to the place where it needs to be modified. For example, the hair dryer can be used for secondary molding. The basic technology and process of this material have applied for Chinese invention patents. Shanghai Medical Device Industry Association
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