García-Vilana Silvia, Sánchez-Molina David, Llumà Jordi, Galtés Ignasi, Velázquez-Ameijide Juan, Rebollo-Soria M Carmen, Arregui-Dalmases Carlos
Escola d'Enginyeria de Barcelona Est, Universitat Politècnica de Catalunya, Av. Eduard Maristany, 16, 08019 Barcelona, Spain.
Institut de Medicina Legal i Ciències Forenses de Catalunya, G.V. Corts Catalanes, 111, 08014 Barcelona, Spain.
Bioengineering (Basel). 2021 Oct 18;8(10):145. doi: 10.3390/bioengineering8100145.
Many previous studies on the mechanical properties of Parasagittal Bridging Veins (PSBVs) found that strain rate had a significant effect on some mechanical properties, but did not extensively study the viscoelastic effects, which are difficult to detect with uniaxial simple tensile tests. In this study, relaxation tests and tests under cyclic loading were performed, and it was found that PSBVs do indeed exhibit clear viscoelastic effects. In addition, a complete viscoelastic model for the PSBVs is proposed and data from relaxation, cyclic load and load-unload tests for triangular loads are used to find reference values that characterize the viscoelastic behavior of the PSBVs. Although such models have been proposed for other types of blood vessels, this is the first study that clearly demonstrates the existence of viscoelastic effects from an experimental point of view and also proposes a specific model to explain the data obtained. Finally, this study provides reference values for the usual viscoelastic properties, which would allow more accurate numerical simulation of PSBVs by means of computational models.
许多先前关于矢状旁桥静脉（PSBVs）力学性能的研究发现，应变率对某些力学性能有显著影响，但未广泛研究粘弹性效应，而单轴简单拉伸试验难以检测到这种效应。在本研究中，进行了松弛试验和循环加载试验，发现PSBVs确实表现出明显的粘弹性效应。此外，提出了一个完整的PSBVs粘弹性模型，并使用来自松弛、循环加载和三角形载荷的加载-卸载试验数据来找到表征PSBVs粘弹性行为的参考值。尽管已经针对其他类型的血管提出了此类模型，但这是第一项从实验角度清楚地证明粘弹性效应存在并提出特定模型来解释所获数据的研究。最后，本研究提供了通常粘弹性特性的参考值，这将有助于通过计算模型对PSBVs进行更准确的数值模拟。
