A steady flow analysis on the stented and non-stented sidewall aneurysm models

Yu, S. C. M.; Zhao, Jiyun

doi:10.1016/s1350-4533(99)00037-5

Cited by 80 publications

(50 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[29][30][31][32][33][34] In experimental studies with particle image velocimetry and computational flow dynamics, a stent decreases inflow complexity, inflow momentum and velocity, vorticity, wall shear stress, and wall shear stress rate, and increases intra-aneurysmal blood turnover time by diverting blood flow from the aneurysm and by dispersing the inflow into the aneurysm sac. [35][36][37][38][39][40][41][42][43] These hemodynamic changes induced by the stent may help to prevent aneurysmal rupture or growth. The hemodynamics can be more favorably changed by decreasing stent porosity and straightening the curvature of the parent vessel segment bearing the aneurysm.…”

Section: Discussionmentioning

confidence: 99%

Clinical and Angiographic Follow-Up of Stent-Only Therapy for Acute Intracranial Vertebrobasilar Dissecting Aneurysms

Park

Kim²,

Kim

et al. 2009

AJNR Am J Neuroradiol

116

103

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Clinical and Angiographic Follow-Up of Stent-Only Therapy for Acute Intracranial Vertebrobasilar Dissecting Aneurysms

Park

Kim²,

Kim

et al. 2009

AJNR Am J Neuroradiol

116

103

View full text Add to dashboard Cite

show abstract

“…This technique, which is widely adopted in a variety of liquid and gas flows, has been used by Lieber et al to quantify the effects of the strut size of three helical stents on flow [19], by Canton et al to measure the intraaneurysmal flow dynamics' and mechanical stresses' changes resulting from the placement of Neuroform stents in bifurcating intracranial aneurysm models [20], and by Yu et al in stented and unstented sidewall aneurysm models under steady flow of different Reynolds numbers [21].…”

Section: Summary Of the Studymentioning

confidence: 99%

Effect of Flow Diverter Porosity on Intraaneurysmal Blood Flow

et al. 2009

View full text Add to dashboard Cite

Background and Purpose: Growth and rupture, the two events that dominate the evolution of an intracranial aneurysm, are both dependent on intraaneurysmal flow. Decrease of intraaneurysmal flow is considered an attractive alternative for treating intracranial aneurysms by minimally invasive techniques. Such modification can be achieved by inserting stents or flow diverters alone. In the present paper, the effect of different commercial and innovative flow diverters' porosity was studied in intracranial aneurysm models. Material and Methods: Single and stent-in-stent combination of Neuroform II as well as single and stent-in-stent combination of a new innovative, low-porosity, intracranial stent device (D1, D2, D1 + D2) were inserted in models of intracranial aneurysms under shear-driven flow and inertia-driven flow configurations. Steady and pulsating flow rates were applied using a blood-like fluid. Particle image velocimetry was used to measure velocity vector fields in the aneurysm midplane along the vessel axis. Flow and vorticity patterns, velocity and vorticity magnitudes were quantified and their value compared with the same flows in absence of the flow diverter. Results: In absence of flow diverters, a solid-like rotation could be observed in both shear-driven and inertia-driven models under steady and pulsatile flow conditions. The flow effects due to the insertion of low-porous devices such as D1 or D2 provoked a complete alteration of the flow patterns and massive reduction of velocity or vorticity magnitudes, whereas the introduction of clinically adopted high-porous devices provoked less effect in the aneurysm cavity. As expected, results showed that the lower the porosity the larger the reduction in velocity and vorticity within the aneurysm cavity. The lowest-porosity device combination (D1 and D2) reached an averaged reduction of flow parameters of 80% and 88% under steady and pulsatile flow conditions, respectively. The reduction in mean velocity and vorticity was much more significant in the shear-driven flows as compared to the inertia-driven flows.

show abstract

“…4,23,24 For ruptured and uncoilable aneurysms, placement of an additional stent within the stent may reconstruct the affected aneurysm and dissecting vessel wall by decreasing wall shear stress, inflow momentum, velocity, and vorticity, thereby diverting the blood flow into the aneurysm or to the weakened vascular wall. [25][26][27][28][29] Some authors have reported multiple and overlapping stent therapy for treatment of uncoilable aneurysms, such as intradural pseudoaneurysms, blood-blister-like aneurysms, and dissection. 23,[30][31][32][33] Our study has some limitations.…”

Section: Discussionmentioning

confidence: 99%