Abstract
Treating an abdominal aortic aneurysm (AAA) with a stent graft (SG) and a multilayer stent (MS) is a key technology in isolating flow fields. Clinically, dual stents (an SG in the proximal and an MS in the distal of AAA) are used for treatment of AAA, but only a few studies have examined the relationship between SG coverage and treatment effects. Through numerical simulation of the hemodynamics after SG and MS implantation, the SG coverage and position were simulated at 0% (0 mm), 25% (13.75 mm), 50% (27.5 mm), and 75% (41.25 mm). With increasing SG coverage, the pressure on the aneurysm sac wall and the flow of branch vessels gradually decreased, and the lower wall shear stress (WSS) gradually increased. The changes in pressure, lower WSS, and the mass flow rate of the branch vessels did not change significantly. The coverage of the SG has a nonsignificant effect on hemodynamics in the treatment of AAA; the implantation position need not be very precise. This research can provide theoretic support for clinicians’ decision-making.
Highlights
An abdominal aortic aneurysm (AAA) is a life-threatening condition[1]
The vortex of blood flow is obvious in the aneurysm sac without stent implantation; this vortex is reduced after stent implantation
The streamlines downstream of the aneurysm sac are disordered with no stent
Summary
The four different SG coverage rates and positions modeled were 0% (0 mm), 25% (13.75 mm), 50% (27.5 mm), and 75% (41.25 mm), respectively, and were marked as case[1] (No stent), case[2] (0% SG coverage, 100% MS coverage), case[3] (25% SG coverage, 75% MS coverage), case[4] (50% SG coverage, 50% MS coverage), and case[5] (75% SG coverage, 25% MS coverage). After determining the relative positions of the blood vessel and stent, the vessel and stent models were subjected to a Boolean subtraction operation. Μ is the dynamical viscosity of blood, and ∇ and Δ represent, respectively, the Hamiltonian and Laplace operators. The walls of the blood vessel and stent were set to a non-slip condition
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
