Biodegradable medical extracorporeal fixing material possessing shape memory function

Abstract

The present invention relates to one kind of biodegradable medical extracorporeal fixing material with shape memory function. The material is polylactic acid and may have added copolymer of epsilon-caprolactone and lactide-epsilon-caprolactone, inorganic mineral, silane as cross-linking agent, coloring agent and other components. It may produced into plate through mixing, pelletizing, extruding, rolling and other steps; or into netted structure through mixing, pelletizing, extruding, weaving and other steps. When it is used, the biodegradable medical extracorporeal fixing material is first softened in warm water at 55-70 deg.c, then fixed in the required position and finally hardened after the temperature is lowered to room temperature. The present invention has excellent permeability, good water tolerance, high strength, shape memory function, capacity of being reused, no irritation to skin, degradability and other advantages.

Description

technical field [0001] The invention relates to a biodegradable medical external fixation material with shape memory. Background technique [0002] At present, gypsum and organic polymer materials are used as fixation materials in medical surgery. Among organic polymer materials, there are thermosetting foam materials and thermoplastic materials. The disadvantages of common plaster fixing materials are that they cannot penetrate X-rays, are large in size, low in strength, not easy to breathe, easy to be wet, easy to break, unhygienic, not conducive to environmental protection, cumbersome to operate, and cannot be remolded. If the patient is using plaster to fix the affected area, the plaster must be removed when radiographic examination is required. If the plasticity is not good, it cannot be repaired, and it can only be removed and redone. [0003] Although thermosetting foam materials are stronger than gypsum in terms of density, air permeability, and radiation-transmitt...

AI Technical Summary

Problems solved by technology

The disadvantages of common plaster fixing materials are that they cannot penetrate X-rays, are large in size, low in strength, not easy to breathe, easy to be wet, easy to break, unhygienic, not conducive to environmental protection, cumbersome to operate, and cannot be remolded. If the patient is using plaster to fix the affected area, the plaster must be removed when radiographic examination is required. If the plasticity is not good, it cannot be repaired, and it can only be removed and redone.

[0003] Although thermosetting foam materials are stronger than gypsum in terms of density, air permeability, and radiation-transmitting ability, their molding process is relatively complicated. In addition, heat release during foaming may burn the skin of the fixed part

The disadvantage of general-purpose thermoplastic polyester is that the plasticity temperature is above 100°C, so it is difficult for the human body to accept this temperature.