Method for preparing functional artificial skin scaffold material

Abstract

The invention discloses a method for preparing a functional artificial skin scaffold material. According to the method, gelatin having a relative molecular mass of over 10000 serving as a main base material, genipin serving as a crosslinking agent and deionized water, distilled water, normal saline, injection water or Ringer solution serving as a solvent are frozen and formed in a special forming mould by a temperature gradient formed in the vertical direction to obtain a porous material. According to the porous material having a skin biotic structure, a honeycomb porous structure is formed inside the material, the pore diameters are gradient from big to small from the lower surface to the upper surface, wherein the pore diameter of the upper surface is 5-70mu m, the pore diameter of the lower surface is 50-200mu m; adjacent holes are communicated. The preparation process is simple and easily controlled and has low manufacture cost; the prepared product has high and stable quality, has a skin simulation structure, and has excellent moisture absorption, biodegradability and biocompatibility.

Description

technical field [0001] The invention relates to a preparation method of a medical porous material, in particular to a preparation method of a functional artificial skin support material. Background technique [0002] Biological graft material is a kind of biomedical material, which usually refers to the material implanted into the human body by surgery for the replacement, repair and reconstruction of tissues and organs, and maintains long-term contact with human tissues, organs and blood. Biomedical implant materials can be classified into biostable, biodegradable and partially biodegradable according to their behavior in living tissues. Among them, the biodegradable and absorbable graft material can not only provide a temporary support or barrier for the body, but also can be removed by degrading into a substance that can be absorbed by the human body after the function is completed, so as to avoid the excretion caused by the long-term existence of foreign matter in the bo...

AI Technical Summary

Problems solved by technology

The skin tissue engineering scaffolds commonly used or researched in clinical practice are mostly scaffolds with uniform pore diameter. Although the material is simple to prepare, it is not suitable for the cultivation of full-thickness skin due to the single pore diameter, and it is easy to cause scars when used clinically.

Studies have shown that gradient tissue engineering scaffolds with biomimetic skin structures are more conducive to skin regeneration. For skin tissue engineering scaffolds with biomimetic skin structures, research reports are mostly prepared by double-layer or multi-layer composite methods or other methods. It is more time-consuming. For example, Harley and Oh et al. studied the use of rotation / centrifugation technology combined with freeze-drying technology to construct a porous scaffold with a gradient pore structure in the radial direction. The pore size of the scaffold can be adjusted by the rotation speed, but this technology is generally only applicable to the preparation of blood vessels. Tubular scaffold materials are not suitable for constructing other scaffold materials (Harley, B.A., Hastings, A.Z., Yannas, I.V. & Sannino, A. Fabricating tubular scaffolds with a radial pore size gradient by aspinning technique. Biomaterials 27, 866-874, doi:10.1016 / j.biomaterials.2005.07.012(2006); Oh,S.H.,Park,I.K.,Kim,J.M.&Lee,J.H.In vitro and in vivo characteristics of PCL scaffolds with pore size gradient fabricated by a centrifugation method.Biomaterials28,1164-i67 :10.1016 / j.biomaterials.2006.11.024(2007)), Wu, Zhang and Mao et al. used different porogens combined with freeze-drying technology to form gradient pores or double-layer scaffold structures, and controlled the pore size distribution by adjusting the size of porogens , but the porogen is difficult to completely remove, and the residual porogen is unfavorable to the later use of the material (Wu, H. et al. Fabrication of chitosan-g-polycaprolactone copolymer scaffolds with gradient porous microstructures. / j.matlet.2008.01.029(2008); Zhang,Q.,Lu,H.,Kawazoe,N.&Chen,G.Preparation of collagen porous scaffolds with a gradient pore size structure using icepar ticulates.Materials Letters 107,280-283, doi:10.1016 / j.matlet.2013.05.070(2013); Mao, J.S., Zhao, L.G., Yin, Y.J.&Yao, K.D. Structure and properties of bilayer chitosan-gelatin scaffolds. Bio4materials 2 , 1067-1074, doi:Pii S0142-9612(02)00442-8), Mao et al. placed the sample in a unidirectional heat conduction environment, and prepared a double-layer support material. Due to the single pre-freezing temperature, the formed support The pore size cannot be adjusted, and no gradient pore structure is formed. Tanya J. Levingstone et al. used layer-by-layer self-assembly method to construct a three-layer gradient biomimetic cartilage scaffold. Time-consuming and laborious (Levingstone, T.J., Matsiko, A., Dickson, G.R., O'Brien, F.J. & Gleeson, J.P.A biomimetic multi-layered collagen-based scaffold for osteochondral repair. Acta Biomaterialia 10, 1996-2004, doi: 10.1016 / j.actbio .2014.01.005(2014))