Shape memory processing biodegradating vitro fixed material for medical use and its preparation

A biodegradable, external fixation technology, applied in medical science, bandages, absorbent pads, etc., can solve the problems of being impermeable to X-rays, airtight, and secondary molding, and achieves good air permeability, water resistance, strong permeability, Good toughness of the product

Inactive Publication Date: 2004-11-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of general-purpose plaster fixation materials are that they cannot pass through X-rays, are dense, airtight, easy to be wet, easy to break, unhygienic, impermeable to X-rays, not conducive to environmental protection, cumbersome to operate, and cannot be remolded. The disadvantage is that if the patient fixes the affected area with plaster, 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
[0004] 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Raw material ratio (percentage by weight): polylactic acid (number average molecular weight 55000, left-handed content is 88%) 60%, 800 mesh calcium carbonate 37%, γ-aminopropyltriethoxysilane (KH-550 silane coupling agent ) 1%, colorant transparent yellow 3G 0.5%, white oil 1.5%, premixed; complete mixing and granulation in a twin-screw extruder. Then the prepared particles are dried in a fluidized bed, extruded on a plate extruder, and calendered into a plate; then the plate is heat-treated, punched on a punching machine, cut into different specifications, and packaged into a product. Similarly, after the net extruder is extruded into a net, it is made into a net by conventional plastic processing methods such as calendering, compression molding, heat preservation, and cooling, and then cut, coiled, and packaged into a product.

[0045] The softening temperature of both products is 60°C. When in use, immerse the fixed plate in warm water at 60°C, and take it out after...

Embodiment 2

[0047] The polylactic acid has a number average molecular weight of 55,000 and a levorotatory content of 92%. The raw material composition and preparation operation are the same as in Example 1, and the softening temperature of the product is 65°C.

Embodiment 3

[0049] The polylactic acid has a number average molecular weight of 55,000 and a levorotatory content of 85%. The raw material composition and preparation operation are the same as in Example 1, and the softening temperature of the product is 56°C.

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PUM

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Abstract

The invention relates to a novel biologically degradable macromolecular external securing material for medical purposes, wherein the essential component of the material is polylactic acid, or can be added poly gamma-caprolactone, inorganic mineral substance (such as calcium carbonate, titanium white, talcum powder, barium sulfate, montmorillonite), silicon alky coupling agent or coloring agent. The invention also discloses its preparation process.

Description

technical field [0001] The invention relates to a biodegradable medical external fixation material with shape memory. [0002] The invention also relates to a method for the preparation of the aforementioned materials. Background technique [0003] 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 such as poly-caprolactone and the like. The disadvantages of general-purpose plaster fixation materials are that they cannot pass through X-rays, are dense, airtight, easy to be wet, easy to break, unhygienic, impermeable to X-rays, not conducive to environmental protection, cumbersome to operate, and cannot be remolded. The disadvantage is that if the patient fixes the affected area with plaster, the plaster must be removed when radiographic examination is required. If the plasticity is not good, it cannot be repaired, and it can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/00A61L15/00A61L15/12A61L31/06
Inventor 边新超陈学思景遐斌杨立新张栓明
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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