在动态流动挑战下,优化高度相互连接的层次性多孔Mg支架的结构演变
Gaozhi Jia1, Yicong Huang2, Zhenjiu Zhang1
1School of Intelligent Manufacturing and Equipment, Shenzhen Institute of Information Technology, Shenzhen 518172, China.
ACS biomaterials science & engineering
|December 2, 2024
概括
这项研究表明,液体流速显著影响支架的降解和多孔性,这对于骨愈合至关重要. 较低的流量减少了相互连接,导致沉积,影响了脚手架的性能.
科学领域:
- 生物材料科学 生物材料科学
- 整形外科工程 整形外科工程
- 组织工程是组织工程.
背景情况:
- (Mg) 和其合金由于生物相容性和生物降解性,对骨螺丝有希望.
- 控制的Mg2+离子释放有助于骨折愈合,使Mg对组织工程具有吸引力.
- 多孔的Mg支架具有很大的表面积,但与缓慢的降解作斗争,并保持组织内生长的相互连接性.
研究的目的:
- 为了引入高度相互连接的层次性多孔Mg支架.
- 在模拟的体液流量下调查脚手架降解行为.
- 阐明退化如何影响脚手架的互连性和结构完整性.
主要方法:
- 使用生物反应器模拟体内生物降解条件,并使用不同的体液流速.
- 在42天内分析了多孔结构和脚手架相互连接的演变.
- 在不同的流速 (0.5,1.0,2.0毫升/分钟) 下量化孔隙变化和沉积物形成.
主要成果:
- 最初的脚手架互连性受到流体流速的显著影响.
- 较低的流速 (0.5毫升/分钟) 导致了大量的Mg2+离子积累和孔隙封闭.
- 孔隙性显著下降:41.25%在0.5毫升/分钟,58.52%在1.0毫升/分钟,68.80%在2.0毫升/分钟42天后.
- 减少毛孔性和毛孔空间封闭阻碍了脚手架的相互连接.
结论:
- 流体流速是管理Mg支架退化和保持结构完整性的关键因素.
- 孔隙性减少的程度可以作为评估脚手架保持互连性的能力的指标.
- 这些发现为设计具有优化的孔支架和相互连接的Mg支架提供了深入的见解,用于增强组织工程应用.
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