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Updated: Sep 13, 2025

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在扩张过程中测量第三代气球可扩展的大动脉的压力

Francesco Nappi¹, Thibaut Schoell², Sanjeet Singh Avtaar Singh³

¹Department of Cardiac Surgery, Centre Cardiologique du Nord; francesconappi2@gmail.com.

Journal of visualized experiments : JoVE

|July 28, 2025

概括

这项研究分析了Edwards SAPIEN 3跨导管大动脉在缩和扩张过程中的机械应力,特别是在大动脉化时. 峰值应力发生在叶片附着点,表明血栓形成和退化的风险.

科学领域:

生物医学工程生物医学工程
心血管研究研究心血管研究
材料科学材料科学材料科学

背景情况:

过导管大动脉置换 (TAVR) 是大动脉狭窄的关键治疗方法.
第三代气球可扩展门如爱德华兹SAPIEN 3 (S3-TAV) 广泛使用.
大动脉化对TAVR设备的性能和寿命构成挑战.

研究的目的:

在存在大动脉化的情况下,在缩和扩张期间确定S3-TAV的机械应力.
为了确定门内应力度的关键区域.
为了将模拟的压力模式与潜在的临床并发症 (如血栓形成和退行) 相关联起来.

主要方法:

对S3-TAV.的3D计算机辅助设计 (CAD) 模型的重建.
有限元分析 (FEA) 模拟门缩,重新打开和系统压力负荷.
利用高分辨率的微型计算机断层扫描来实现精确的几何网格.
来自手术生物假体和-合金的材料特性.

主要成果:

在结过程中,峰值应力集中在 commissural 尖端,说明书的附着部位.
这些压力热点被确定为血栓形成和退化的潜在地点.
扩张后持续的大量化会导致膜外泄 (PVLs),这是血栓形成和退化的前体.

结论:

缩过程会在S3-TAV.的指部尖端引发显著的应力.
大动脉化是影响门应力分布和潜在故障模式的关键因素.
了解这些机械应力对于改善TAVR设备设计和患者治疗结果至关重要.

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