一个参数研究,评估一个通用FEM模拟PTA没有支架部署的隐性Solver极限的参数研究
概括
皮肤透光血管整形术 (PTA) 的有限元模型 (FEM) 模拟对于预测结果至关重要. 这项研究确定了FEM对PTA的强度极限,发现它在所有动脉大小的狭窄症中可靠性低于50%.
科学领域:
- 生物医学工程 生物医学工程
- 计算力学 计算力学 计算力学
- 医疗模拟 医疗模拟
背景情况:
- 皮肤透光血管整形术 (PTA) 是治疗动脉狭窄的一种常见手术.
- 像有限元模型 (FEM) 这样的数值工具可以通过预测外科手术结果来提高PTA结果.
- 对于临床翻译,FEM模拟的稳定性至关重要.
研究的目的:
- 调查PTA程序的通用FEM的稳定性.
- 为了确定狭窄的百分比,偏移和动脉口径对模拟收的影响.
- 在PTA中建立可靠的FEM模拟的边界.
主要方法:
- 开发了一个PTA程序的通用FEM.
- 模拟了五个动脉口径,通过调整内部直径与墙壁厚度比.
- 在一致的设置下测试了四十个不同的配置,在一致的设置下变化了狭窄率和偏移.
- 分析了模拟的融合和元素变形.
主要成果:
- 对于超过65%的狭窄症而言,由于过度元素变形而导致的阻塞,会出现收问题.
- 狭窄性偏移的增加会对模拟趋同产生负面影响.
- 对小大动脉口径的模拟与中等口径相比,不那么强大.
- 一个隐式解答器在所有口径中显示出对压缩症的稳定性低于50%.
- 中等口径的动脉表现出更好的强度,在狭窄时汇聚高达60%.
结论:
- 对PTA的FEM模拟对于在不使用支架的情况下预测永久性应变是有价值的.
- FEM解决器的稳定性取决于狭窄的严重程度,偏移和动脉大小.
- 在所有口径中,暗示解答器在PTA模拟中具有强度,在所有口径中小于50%的狭窄,在中等口径中高达60%.
- 本研究定义了在PTA规划中可靠的FEM应用的关键参数.
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