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多孔介质期刊
影响因子: 1.752 5年影响因子: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

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多孔介质期刊

DOI: 10.1615/JPorMedia.v12.i9.50
pages 887-897

Numerical Modeling of Coil Compaction in the Treatment of Cerebral Aneurysms Using Porous Media Theory

Khalil Khanafer
Mechanical Engineering Department, Australian College of Kuwait, Safat, 13015
Ramon Berguer
Vascular Mechanics Laboratory, Department of Biomedical Engineering, and Section of Vascular Surgery, University of Michigan, Ann Arbor, MI 48109, USA
Marty Schlicht
Vascular Mechanics Laboratory, Department of Biomedical Engineering, and Section of Vascular Surgery, University of Michigan, Ann Arbor, MI 48109, USA
Joseph L. Bull
Vascular Mechanics Laboratory, Department of Biomedical Engineering, and Section of Vascular Surgery, University of Michigan, Ann Arbor, MI 48109, USA

ABSTRACT

A numerical model was developed to quantify the reduction in blood velocity and pressure resulting from the placement of endovascular coils within a cerebral aneurysm using physiological velocity waveforms. The flow characteristics within the aneurysm sac were modeled using the volume-averaged porous media equations. We studied the effects of narrow and wide aneurysmal necks on the velocity fields and pressure within the aneurysmal sac in the absence of the coils. Within the sac at peak systole, wide-neck aneurysms experience higher velocity and pressure than narrow-neck aneurysms. Our study shows that velocity fields are significantly affected by the presence of an endovascular coil within the aneurysm sac. Moreover, we estimated that a volume density of a 20% platinum coil in the aneurysmal sac was sufficient to cause sufficient blood flow arrest in the aneurysm to allow for thrombus formation. A new model based on the porous media theory is proposed for the study of the effects of coiling in brain aneurysms. Porous media theory permits the study of fluid motion across small spaces of variable and complex geometry. A simple formula to calculate the length of platinum wire required to achieve flow arrest within an aneurismal sac of known diameter is presented.


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