Vol. 33 - No. 1 INTERNATIONAL ANGIOLOGY 1 ameter, length and angulation. 1 However, the relative role of EG iliac limbs - with respect to main-body length in the determination of DF has been underestimated. The present computational study investigates the inluence of the relative limb length on the magnitude of DF acting over the entire EG, its bi- furcation and the iliac sites, delineating essential pathophysiological aspects of aortic endografts and providing valuable information towards the development of endografts with greater migra- tion resistance and, thus, better clinical perform- ance. Materials and methods Details of our methodology have been exten- sively described elsewhere. 2 Briely, a customary bifurcated 3D model was computationally cre- ated, by computationally interpolating cross- section proiles to form the EG body (Figure 1A). The EG model was meshed using ANSYS ICEM (Ansys Inc., Canonsburg, PA, USA). Unstruc- tured 3D triangular meshes were produced for use in the computational analysis (Figure 1B). The solid and luid domain of the mesh com- prised 42.831 and 40.897 elements, respectively. The commercially available and well-validated ANSYS (Ansys Inc., version 12.1, Ansys Inc.) software was used in order to describe the low ield by means of solving the conservation of mass and momentum equations for incompress- ible luid. 3 ??? Computational estimation of the inluence of the main body-to-iliac limb length ratio on the displacement forces acting on an aortic endograft; theoretical application to Bolton Treovance abdominal stent-graft E. GEORGAKARAKOS 1 , A. XENAKIS 2 , G. S. GEORGIADIS 1 , C. ARGYRIOU 1 , C. MANOPOULOS 2 , S. TSANGARIS 2 , M. K. LAZARIDES 1 1 Department of Vascular Surgery, “Democritus” Medical School, University Hospital of Alexandroupolis, Alexandroupolis, Greece; 2 Fluids Section, School of Mechanical Engineering, National Technical University of Athens, Athens, Greece Aim. The inluence of the relative iliac limb length of an en- dograft (EG) on the displacements forces (DF) predisposing to adverse effects are under-appreciated in the literature. Therefore, we conducted a computational study to estimate the magnitude of the DF acting over an entire reconstructed EG and its counterparts for a range of main body-to-iliac limb length (L1/L2) ratios. Methods. A customary bifurcated 3D model was computa- tionally created and meshed using the commercially avail- able ANSYS ICEM (Ansys Inc., Canonsburg, PA, USA) soft- ware. Accordingly, Fluid Structure Interaction was used to estimate the DF. The total length of the EG, was kept con- stant, while the L1/L2 ratio ranged from 0.3 to 1.5. Results. The increase in L1/L2 affected slightly the DF on the EG (ranging from 3.8 to 4.1N) and its bifurcation (4.0 to 4.6N). However, the forces exerted at the iliac sites were strongly affected by the L1/L2 values (ranging from 0.9 to 2.2N), showing a parabolic pattern with a minimum for 0.6 ratio. Conclusion. It is suggested that the hemodynamic effect of the relative limb lengths should not be considered neg- ligible. A high main body-to-iliac limb length ratio seems to favor hemodynamically a low bifurcation but attenuates the main body-iliac limbs modular stability. Further clini- cal studies should investigate the relevant value of these indings. The Bolton Treovance device is presented as a rep- resentative, improved stent-graft design that takes into ac- count these hemodynamic parameters in order to achieve a promising, improved clinical performance. [Int Angiol 2014;33:1-2] Key words: Endovascular procedures - Migration. Endograft (EG) dislodgment is considered one of the major concerns after endovascular aneu- rysm repair (EVAR), resulting in loss of proper proximal and distal sealing. 1 The magnitude and direction of the responsible displacement forces (DF) depend strongly on multiple geo- metric factors of the EG, such as the inlet di- 3245-ANGY PROOF MINERVA MEDICA