Stent Configurations And Its Effectiveness In Renal Artery Aneurysm

Renal artery aneurysm (RAA) is a disease in which the renal artery is dilated at a particular point. Endovascular, a treatment for aneurysm by inserting a stent (or flow diverter (FD)) in the aneurysm effected artery is the preferable choice today. In the hemodynamic study, the focus on RAA study is...

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Main Author:	Bakar, Muhammad Haziq Abu
Format:	Thesis
Language:	English
Published:	2019
Subjects:	T Technology TJ Mechanical engineering and machinery
Online Access:	http://eprints.usm.my/50245/1/Stent%20Configurations%20And%20Its%20Effectiveness%20In%20Renal%20Artery%20Aneurysm.pdf
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spelling	my-usm-ep.502452021-11-17T03:42:12Z Stent Configurations And Its Effectiveness In Renal Artery Aneurysm 2019-04-01 Bakar, Muhammad Haziq Abu T Technology TJ Mechanical engineering and machinery Renal artery aneurysm (RAA) is a disease in which the renal artery is dilated at a particular point. Endovascular, a treatment for aneurysm by inserting a stent (or flow diverter (FD)) in the aneurysm effected artery is the preferable choice today. In the hemodynamic study, the focus on RAA study is still lacking compared to other aneurysm conditions. In this thesis, FSI simulations and PIV experimental work of RAA condition for different configurations of FD were conducted to study its effectiveness in treating RAA. Flow patterns, wall shear stress (WSS), deformation and von Mises stress parameters were analysed. The FD configurations were divided into two: (1) different porosity (65% to 80%); (2) different thickness (0.05 mm to 0.09 mm). In addition, Quemada rheological model was used to represent blood material properties. This material model considers all the important factor that affect the viscosity of the blood including shear rate, plasma viscosity and red blood cells. Comparison between simulations and PIV experimental data showed good agreement with average percentage difference around 5%. The blood circulation inside the aneurysm reduced drastically when FD placed in the RAA model. A reduction around 90% for WSS and 40% for deformation when FD was not presence. Additionally, von Mises stresses experienced by RAA was larger stress when no FD placed inside the RAA. Secondly was comparison of FD with different thicknesses. For the flow pattern, FD with thickness of 0.05 mm had blood circulation inside the aneurysm dome. additionally, the WSS recorded for it was the largest among all three cases. Furthermore, as the FD thickness increased, the maximum von Mises stress experienced decreases. In conclusion, FD with porosity percentage of 65% is sufficient to produce the desired and comparable results as with FD with greater percentage porosity. In terms of the FD thickness, the suggested minimum FD thickness to prevent from having blood circulation inside the aneurysm sac is 0.07 mm. 2019-04 Thesis http://eprints.usm.my/50245/ http://eprints.usm.my/50245/1/Stent%20Configurations%20And%20Its%20Effectiveness%20In%20Renal%20Artery%20Aneurysm.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Mekanik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology TJ Mechanical engineering and machinery
spellingShingle	T Technology TJ Mechanical engineering and machinery Bakar, Muhammad Haziq Abu Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
description	Renal artery aneurysm (RAA) is a disease in which the renal artery is dilated at a particular point. Endovascular, a treatment for aneurysm by inserting a stent (or flow diverter (FD)) in the aneurysm effected artery is the preferable choice today. In the hemodynamic study, the focus on RAA study is still lacking compared to other aneurysm conditions. In this thesis, FSI simulations and PIV experimental work of RAA condition for different configurations of FD were conducted to study its effectiveness in treating RAA. Flow patterns, wall shear stress (WSS), deformation and von Mises stress parameters were analysed. The FD configurations were divided into two: (1) different porosity (65% to 80%); (2) different thickness (0.05 mm to 0.09 mm). In addition, Quemada rheological model was used to represent blood material properties. This material model considers all the important factor that affect the viscosity of the blood including shear rate, plasma viscosity and red blood cells. Comparison between simulations and PIV experimental data showed good agreement with average percentage difference around 5%. The blood circulation inside the aneurysm reduced drastically when FD placed in the RAA model. A reduction around 90% for WSS and 40% for deformation when FD was not presence. Additionally, von Mises stresses experienced by RAA was larger stress when no FD placed inside the RAA. Secondly was comparison of FD with different thicknesses. For the flow pattern, FD with thickness of 0.05 mm had blood circulation inside the aneurysm dome. additionally, the WSS recorded for it was the largest among all three cases. Furthermore, as the FD thickness increased, the maximum von Mises stress experienced decreases. In conclusion, FD with porosity percentage of 65% is sufficient to produce the desired and comparable results as with FD with greater percentage porosity. In terms of the FD thickness, the suggested minimum FD thickness to prevent from having blood circulation inside the aneurysm sac is 0.07 mm.
format	Thesis
qualification_level	Master's degree
author	Bakar, Muhammad Haziq Abu
author_facet	Bakar, Muhammad Haziq Abu
author_sort	Bakar, Muhammad Haziq Abu
title	Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
title_short	Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
title_full	Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
title_fullStr	Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
title_full_unstemmed	Stent Configurations And Its Effectiveness In Renal Artery Aneurysm
title_sort	stent configurations and its effectiveness in renal artery aneurysm
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Mekanik
publishDate	2019
url	http://eprints.usm.my/50245/1/Stent%20Configurations%20And%20Its%20Effectiveness%20In%20Renal%20Artery%20Aneurysm.pdf
_version_	1747822029511327744

Stent Configurations And Its Effectiveness In Renal Artery Aneurysm

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