Computational fluid dynamics (CFD) modelling of virtual flow diverters (FD) to determine risk of delayed rupture of aneurysms after stenting with flow diverters

W. Chong, Y. Qian, Y. Zhang, K. Mitchell, L. Lai

    Research output: Contribution to journalMeeting abstract

    Abstract

    Purpose: To evaluate if CFD can determine the risk of delayed rupture of aneurysms treated with flow diverters. Materials and Methods: Two carotid aneurysms each treated by a single SILK were studied. One completely occluded within 6 months. CTAngiogram before stenting, at 2 days (40% thrombosed) and 6 months were analysed. The other ruptured at 3.5 months. The 3 months CTA (no aneurysm thrombosis) was studied. CFD performed using ANSYS. The Virtual FD was simulated using the porous media method. Results: For the occluded aneurysm, CFD of the first CTA after placement of a Virtual FD showed a reduction of energy loss across the aneurysm neck of 64%, reduction of flow into the aneurysm by 92.9%, disappearance of the high wall shear stress (WSS) region and change in the flow pattern from a circular jet coming from the inflow to a non-jet flow from the FD centre with stasis in large part of the aneurysm. This predicted the actual day 2 results showing further reduction to 16% and by 99.9% respectively, uniform low WSS and minimal central flow only. Actual energy loss at 6 months was only 3%. For the ruptured case, the Virtual FDs simulated the actually deployed Silk which was stretched at the inlet allowing a large jet to flow into the aneurysm and simulated an optimally deployed FD. The simulated stretched versus optimal FD studies showed energy loss of 63% versus 52%, flow reduction of 43.8% to 96.3%, continued jet flow to no jet flow, and high WSS to low WSS respectively. Conclusion: The CFD findings of high energy loss, low flow reduction, continued jet flow and high WSS are possible predictors of delayed rupture. Virtual FD can be used to predict outcome.
    Original languageEnglish
    Pages (from-to)58
    Number of pages1
    JournalInterventional Neuroradiology
    Volume17
    Issue numberSuppl. 1
    Publication statusPublished - 2011
    EventWorld Federation of Interventional and Therapeutic Neuroradiology (11th : 2011) - Cape Town
    Duration: 8 Nov 201111 Nov 2011

    Fingerprint Dive into the research topics of 'Computational fluid dynamics (CFD) modelling of virtual flow diverters (FD) to determine risk of delayed rupture of aneurysms after stenting with flow diverters'. Together they form a unique fingerprint.

    Cite this