在剪切驱动破裂中血凝块的机制和微观结构
Ranjini K Ramanujam1, Konstantinos Garyfallogiannis2, Rustem I Litvinov3
1Department of Biomedical Engineering, Rutgers University, Piscataway, NJ, USA. vt280@soe.rutgers.edu.
Soft matter
|April 30, 2024
概括
血液凝块的稳定性是由纤维素网络决定的. 血流中常见的剪切力会导致血块破裂,但骨折性保持一致,有助于防止栓塞.
科学领域:
- 生物物理学的生物物理.
- 生物材料科学 生物材料科学
- 心血管研究研究心血管研究
背景情况:
- 血管内血栓可以由于水力动力学力量而破裂,导致栓塞和下游血管阻塞.
- 血栓的机械稳定性主要由三维纤维素聚合物网络来控制.
- 之前的研究主要研究了在拉伸负荷下 (模式I) 的凝块破裂.
研究的目的:
- 研究在剪切负荷下 (模式II) 纤维素凝块的破裂机制,在生理血液流动条件下普遍存在.
- 为了确定断裂性是否取决于加载模式 (拉力与剪切).
- 阐明控制血液凝块机械稳定的基本性质.
主要方法:
- 在剪切应力下对纤维素凝块破裂的实验研究.
- 凝块力学的理论建模和分析.
- 在破裂期间对凝块形态的超结构检查.
- 有限元模拟用于分析裂传播动态.
主要成果:
- 断裂性,衡量关键能量释放率,被发现在很大程度上独立于负载类型 (模式I与模式II).
- 这表明骨折性是纤维素凝的内在性质.
- 裂纹在破裂期间的传播垂直于裂纹尖端的最大拉伸,表明主要是拉伸局部破裂机制.
结论:
- 在剪切负荷下血块的机械稳定性与在拉力负荷下相似.
- 断裂性是纤维素网络的一个基本属性,无论施加的力类型如何.
- 了解这些破裂机制对于开发预测和预防血栓栓塞的策略至关重要.
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