纺织学报 ›› 2025, Vol. 46 ›› Issue (01): 206-216.doi: 10.13475/j.fzxb.20240103502

• 综合述评 • 上一篇    下一篇

熔体近场直写制备组织工程支架的研究进展

杨柳1,2, 杜磊1(), 徐淮中2   

  1. 1.浙江理工大学 服装学院, 浙江 杭州 310018
    2.京都工艺纤维大学 生物基材料科学学院, 日本 京都 606-8585
  • 收稿日期:2024-01-18 修回日期:2024-10-09 出版日期:2025-01-15 发布日期:2025-01-15
  • 通讯作者: 杜磊(1989—),男,副教授,博士。主要研究方向为生物医用纤维材料开发。E-mail:dulei@zstu.edu.cn
  • 作者简介:杨柳(1998—),女,博士生。主要研究方向为生物医用纤维材料开发。
  • 基金资助:
    国家自然科学基金项目(52403054);浙江省重点研发计划项目(2023C01196);杭州市卫生科技计划重大项目(Z20230087);国家留学基金项目(202007295002);国家留学基金项目(202308330110)

Research progress in tissue engineering scaffolds fabricated by melt electrowriting technology

YANG Liu1,2, DU Lei1(), XU Huaizhong2   

  1. 1. School of Fashion Design & Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Department of Biobased Materials Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan
  • Received:2024-01-18 Revised:2024-10-09 Published:2025-01-15 Online:2025-01-15

摘要:

熔体近场直写(MEW)作为一种新兴的增材制造技术,可在微米尺度下实现纤维支架结构的精准构筑。为进一步推动该技术在组织工程领域的应用,综述了近年来国内外MEW技术的研究进展。针对MEW设备组成,详解了各模块的工作原理和设计思路;针对MEW射流调控,阐述了射流稳定及沉积过程中的成形机制与控制机制;针对MEW技术的应用场景,讨论了不同结构支架的构筑方法及其构效关系;此外,还总结了MEW技术与其它技术结合的典型范例;最后,展望了MEW技术的发展方向,以期为其在多领域交叉融合发展提供理论支撑和应用参考。

关键词: 熔体近场直写, 增材制造, 高分辨率打印, 射流控制, 组织工程, 纤维支架

Abstract:

Significance Melt electrowriting (MEW) technology is an emerging and promising additive manufacturing technology that allows for precise control of scaffold structure while maintaining the microscale of fibers. With the assistance of electrical power and collector translation (or mandrel rotation), scaffolds with controllable structures and high-precision can be fabricated. MEW has been demonstrated to have the potential to be used as bone tissue engineering scaffolds, heart valve scaffolds, and vascular scaffolds. The prepared scaffolds exhibit excellent mechanical properties, effectively promote extracellular matrix formation while supporting cell attachment and proliferation. These characteristics facilitate orderly cellular behaviors and differentiation, ultimately enhancing tissue regeneration. In addition, MEW has been combined with other technologies to promote the biological properties of the scaffolds, helping to broaden the scope of MEW applications in the field of tissue engineering scaffolds. This integration improves mechanical strength and broadens the scope of MEW applications in tissue engineering by enabling the creation of hybrid structures with tailored functionalities.

Progress Based on the current MEW technology and fiber forming mechanisms, this paper provides a detailed review of the research progress in MEW technology for the preparation of tissue engineering scaffolds. Based on the characteristics of MEW technology, this paper scrutinizes MEW from the aspects of equipment composition, printing regulation, and structural design. The multi-parameter characteristics of MEW and the dynamic relationship between printing parameters directly affect the printing quality. During the printing process, some phenomena affecting the quality of the printed scaffolds, such as fiber pulsing, fiber bridging, and fiber shifting, would occur. In order to avoid these undesirable phenomena, precise printing of tissue engineering scaffolds can be achieved by adjusting the cooperation of each parameter. For the tissue engineering scaffolds, this paper introduces them as planar scaffolds and non-planar scaffolds, in which planar scaffolds are divided into homogeneous scaffolds and heterogeneous scaffolds. The non-planar scaffolds are categorized into tubular scaffolds, which have been a research hotspot in recent years, and scaffolds obtained from other non-planar receiving devices. For the combination of MEW technology with other technologies, this paper mainly introduces the combination of MEW technology with fused deposition modeling (FDM), electrospinning, and hydrogel. For the biological applications of MEW technology, this paper focuses on its use in bone tissue engineering, heart valves, tendons, blood vessels, renal tubules, and other fields.

Conclusion and Prospect To further promote the application of MEW in the field of tissue engineering, this paper covers the research progress in MEW technology in recent years. Owing to its capability to achieve precise control of the scaffold structure at the microscale, this technology has expanded the application of fiber scaffolds in the biomedical field. However, some issues still existo that need to be addressed. 1) Material range: the range of printable materials for MEW is essential. Currently, most of the current research still revolves around the polymer polycaprolactone due to its low melting point and high thermal stability. However, its degradation rate and Young's modulus present compatibility challenges for clinical applications. Therefore, expanding the application of MEW printed polymer is imperative to promote the practical application of tissue engineering scaffolds. 2) Thermal degradation control: controlling the thermal degradation rate of MEW-printed materials remains challenging due to minimal melt extrusion volume and prolonged heating processing. although a filament-based feeding system inspired by FDM printers has been developed, its widespread applicability is yet to be proven. 3) Customization of complex scaffolds: MEW utilizes an electrostatic field to create fibers, but jet initiation time limits design flexibility compared to FDM. Further research is needed on path planning to achieve precise printing of complex scaffolds under uninterrupted jet flow conditions. 4) Clinical validation: although functional scaffolds for bone tissue engineering and heart valve scaffolds have been fabricated, clinical validation has yet to be achieved. The mechanisms underlying tissue repair and the practical application effects of their work still require further exploration and clarification. As the research progresses, it is believed that the MEW technology can be extended to many tissue engineering applications in the coming years.

Key words: melt electrowriting, additive manufacturing, high resolution printing, jet control, tissue engineering, fiber scaffold

中图分类号: 

  • TS151

图1

熔体近场直写装置"

图2

熔体近场直写特殊现象"

图3

不同结构支架与应用"

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