  Total endovascular repair of the aortic arch represents a promising option
for patients ineligible to open surgery. Custom-made design of stent-grafts
(SG), such as the Terumo Aortic RelayBranch device (DB), requires complex
preoperative measures. Accurate SG deployment is required to avoid
intraoperative or postoperative complications, which is extremely challenging
in the aortic arch. In that context, our aim is to develop a computational tool
able to predict SG deployment in such highly complex situations. A
patient-specific case is performed with complete deployment of the DB and its
bridging stents in an aneurysmal aortic arch. Deviations of our simulation
predictions from actual stent positions are estimated based on post-operative
scan and a sensitivity analysis is performed to assess the effects of material
parameters. Results show a very good agreement between simulations and
post-operative scan, with especially a torsion effect, which is successfully
reproduced by our simulation. Relative diameter, transverse and longitudinal
deviations are of 3.2$\pm$4.0%, 2.6$\pm$2.9mm and 5.2$\pm$3.5mm respectively.
Our numerical simulations show their ability to successfully predict the DB
deployment in complex anatomy. The results emphasize the potential of
computational simulations to assist practitioners in planning and performing
complex and secure interventions.
