Design Characterization of Thin Film Flow Diverter Stents (FDS) Based on SMA’s: FEA, CFD and MRI Study

Authors:

Velvaluri P, Pravdivtseva MS, Lima de Miranda R, Hövener J-B, Jansen O, Quandt E

Year of publication:

2019

Volume:

Issue:

ISSN:

Journal (long):

Springer, Cham

Journal (short):

Impact factor:

PubMed: -
Abstract:

The current state of the art for the treatment of intracranial aneurysms is by diverting flow using an implant through minimally invasive therapies. The majority of the devices used in the area are produced from shape memory alloys (SMA). Advancements in SMA production technologies promise new devices with improved performance and functionality. The characterization of such devices, however, is quite resource intensive. Thereby, we propose a virtual routine in order to steer the design development process of such devices. The virtual analysis using numerical methods are employed to verify the structural and flow related design criteria. Here, we addressed the importance of experimental verification for such virtual techniques. The structural numerical analysis using FEA was successfully carried out to realize the crimping aspect of a stent design to evaluate the regions of high stresses. Moreover, the radial force on deployment was evaluated and compared to the commercial counter parts. The flow analysis in a patient-derived model was successfully carried out virtually with CFD, in vitro and in vivo using MRI. The qualitative comparison between the above techniques showed the reliability of CFD and its importance in design testing process. The presented virtual methods allow to screen a FDS design and to optimize its design parameters for the treatment of aneurysms.

doi: 10.1007/s40830-019-00223-8

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