Hemodynamic comparison of stent configurations used for aortoiliac occlusive disease

Abstract

The studied aortoiliac stent configurations have distinct locations where flow disturbances occur, and these are related to the radial mismatch. The CERAB configuration is the most unimpaired physiologic reconstruction, whereas BMK and CK stents have their typical zones of flow recirculation.

Flow and wall shear stress characterization after endovascular aneurysm repair and endovascular aneurysm sealing in an infrarenal aneurysm model

“…The setup was based on a two-parameter Windkessel model, including a compliance chamber downstream of the phantom to simulate peripheral vessel impedance. 13 In brief, a pulsatile flow at a rate of 60 beats/min was generated with a physiologic flow rate in a range of 1.6 L/min (peak flow, 3.6 L/min). The inlet section consisted of a 1.2-m tube to ensure a fully developed laminar flow entering the model.…”

High-Frame-Rate Contrast-Enhanced Ultrasound for Velocimetry in the Human Abdominal Aorta

“…In AA aneurysms, changes in flow patterns modulate inflammatory mechanisms in the vascular endothelium, causing aneurysm growth [4]. For AA aneurysms and stenotic lesions around the aortic bifurcation, in vitro data have shown that different treatment options generate different flow perturbations [5], [6], which can partly explain the different outcomes of these treatments. Post-treatment analysis of AA blood-flow patterns may make the follow-up schemes after endovascular treatment more patient-specific by predicting potential failure.…”

A novel roller pump for physiological flow

“…where C 1 = 1.281, C 2 = 0.064, C 3 = −1.03, C 4 = 0.885, C 5 = −0.166, and t is the time in second. The period T and coefficient C 1 were modified from 0.83 and 2.891 to produce zero end systolic velocity (ESV) and 60 beats per minute or 1 Hz (T = 1 seconds), resting heart rate to match the suprarenal profile used by Groot Jebbink et al 1 Infrarenal flow profile based on Fraser et al 16 was digitized manually with 100 time points at 10 ms intervals. The effective flow rate was adjusted from 13.3 to 12.5 mL and heart rate was adjusted from 64.5 to 60 beats/minute.…”

“…Furthermore, it has been successfully used by researchers to study and validate new treatment methods such as minimally invasive endovascular stent treatments. 1,2 In addition,…”

“…Previous devices can be classified according to the type of pumps used in the setup that is, gear, piston, or roller/peristaltic. Gear pumps have been used by Groot Jebbink et al, 1 Boersen et al, 2 and Hoskins 8 to generate the pulsatile waveforms. However, the disadvantage of gear pumps is that suspended particles are easily damaged and it is sensitive to cavitation produced by the hydrodynamic action of the gears.…”