Coupled fluid-wall modelling of steady flow in stenotic carotid arteries

RESEARCH ON BIOMECHANICS PROPERTIES AND HEMODYNAMICS PERFORMANCE OF THE CONVERTIBLE VENA CAVA FILTER

This paper reveals the biomechanical properties and hemodynamics performance of the convertible vena cava filter while it was in the process of implantation and conversion in the blood vessels. This paper uses the finite element method and computational fluid dynamics to analyze the interaction mechanism and influence of the convertible vena cava filter while the filter was in the process of implantation and conversion in the blood vessels. Additionally, six pigs were used as experimental samples to verify the effects of the filter in the blood vessels. The computer-aided simulation results showed that it was easier to cause damage to the vessel wall prior to the filter being converted into support. On the contrary, the stress, the peak value of the blood vessel’s stress, the outlet velocity, and the supporting stiffness were reduced after the conversion. Due to the intimal hyperplasia, the supporting element was easy to fix on the inner surface of the blood vessels, which was helpful for the correct positioning of the filter after the conversion. Meanwhile, the animal experiments proved that the surface of inferior vena cava wall was relatively smooth, and the filter did not cause vascular wall rupture. The computer-aided simulation and animal experiments proved the reasonability of the structure of the filter design, and that the filter has good biomechanical properties. The results will provide more scientific reference for the clinical treatment and design of the filter.

Reconfiguration of the Carotid Artery after Angioplasty and Stenting: A Case Report and Review of the Literature

Severe carotid stenosis or occlusion may cause insufficient blood flow and lead to distal artery wall collapse and extensive lumen contraction. Whether this 'adaptive narrowing' can restitute after carotid recanalization is unclear. We report a patient with global ischemia due to occlusions of bilateral carotid and right vertebral arteries. The occluded left carotid was recanalized successfully with angioplasty and stenting. The adaptively narrowed distal carotid did not restitute immediately but regained its morphology 1 week after the procedure. Carotid adaptive narrow distal occlusion or stenosis may not regain its original morphology immediately but several days after recanalization. This knowledge is instructive for treating occlusive carotid diseases.