中国神经再生研究(英文版) ›› 2017, Vol. 12 ›› Issue (4): 614-622.doi: 10.4103/1673-5374.205101

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

基于MRI数据三维打印技术定制的脑组织工程支架

  

  • 收稿日期:2017-03-27 出版日期:2017-04-15 发布日期:2017-04-15
  • 基金资助:

    中国国家自然科学基金项目(81301050, 81401067, 81271392, 81471275, 81541034);天津市自然科学基金项目(14JCQNJC10200, 15JCQNJC11100, 16JCYBJC27600

Magnetic resonance imaging-three-dimensional printing technology fabricates customized scaffolds for brain tissue engineering

Feng Fu1, 2, Zhe Qin3, Chao Xu1, 2, Xu-yi Chen1, 2, Rui-xin Li4, Li-na Wang1, 2, Ding-wei Peng1, 2, Hong-tao Sun1, 2, Yue Tu1, 2, Chong Chen1, 2, Sai Zhang1, 2, Ming-liang Zhao1, 2, Xiao-hong Li1, 2   

  1. 1 Institute of Traumatic Brain Injury and Neurology, Pingjin Hospital, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China; 2 Key Laboratory of Neurotrauma Repair of Tianjin, Tianjin, China; 3 Pingjin Hospital, Logistics University of Chinese People’s Armed Police Forces, Tianjin, China; 4 Institute of Medical Equipment, The Academy of Military Medical Sciences, Tianjin, China
  • Received:2017-03-27 Online:2017-04-15 Published:2017-04-15
  • Contact: Ming-liang Zhao, M.D. or Xiao-hong Li, M.D., physolar@sohu.com or lixiaohong12@hotmail.com.
  • Supported by:

    This work was supported by the National Natural Science Foundation of China, No. 81301050, 81401067, 81271392, 81471275, 81541034; the Natural Science Foundation of Tianjin City of China, No. 14JCQNJC10200, 15JCQNJC11100, 16JCYBJC27600.

摘要:

传统工艺制备的支架因其空间结构与不规则空腔结构有着较大的差距,故修复神经功能的效果有限,三维打印技术在定制空腔微结构方面克服了传统制造方法中存在的复杂外形制造困难和内部微结构无法控制的缺陷。为此,实验以采取电子皮质挫伤仪构建随机的脑组织缺损模型,基于MRI数据重建空腔模型设计支架。由于制造过程中分辨率有限,我们将空腔模型放大5倍后,以胶原/壳聚糖材料制作了支架。结果显示支架具有立体多孔结构、高孔隙率、高比表面积、孔隙内部连通性好、力学性能较软等特性,适宜神经干细胞黏附和生长。同时体内植入实验证实其良好的生物相容性和生物可降解性。结果说明采用三维打印技术成功制备了具有特定外形和复杂内部结构的脑组织仿生支架,该支架在神经修复领域具有较好的研究和应用潜力。

ORCID:0000-0001-8745-140X(Xiao-hong Li)

关键词: 神经再生, 三维打印, 颅脑创伤, 组织工程支架, MRI, 胶原, 甲壳素, 模拟

Abstract:

Conventional fabrication methods lack the ability to control both macro- and micro-structures of generated scaffolds. Three-dimensional printing is a solid free-form fabrication method that provides novel ways to create customized scaffolds with high precision and accuracy. In this study, an electrically controlled cortical impactor was used to induce randomized brain tissue defects. The overall shape of scaffolds was designed using rat-specific anatomical data obtained from magnetic resonance imaging, and the internal structure was created by computer-aided design. As the result of limitations arising from insufficient resolution of the manufacturing process, we magnified the size of the cavity model prototype five-fold to successfully fabricate customized collagen-chitosan scaffolds using three-dimensional printing. Results demonstrated that scaffolds have three-dimensional porous structures, high porosity, highly specific surface areas, pore connectivity and good internal characteristics. Neural stem cells co-cultured with scaffolds showed good viability, indicating good biocompatibility and biodegradability. This technique may be a promising new strategy for regenerating complex damaged brain tissues, and helps pave the way toward personalized medicine.

Key words: nerve regeneration, three-dimensional printing, traumatic brain injury, tissue engineering, scaffolds, magnetic resonance imaging, collagen, chitosan, mimics, neural regeneration