Endovascular abdominal aortic aneurysms repair (EVAR) is a technique which involves the minimally invasive implantation of a stent-graft within the aorta to exclude the aneurysm from the circulation, preventing its rupture. The feasibility of such operation is highly dependent on the aorta morphology and in general the presence of the visceral arteries (e.g. the renal arteries) emerging from the aneurysm is the absolute limit for the implantation of a standard stentgraft. Hence, classical intervention method involves the implantation of a custom-made graft with fenestrations, leading to the use of expensive prosthesys and a very complicated surgery with high risks for the patient. More recent techniques introduced the use of standard grafts (i.e. without fenestrations) realizing a mechanical in-situ fenestration, but this procedure is limited principally by the brittleness and low stability of the environment. Also the difficult of guidance of the endovascular tools due to the temporarily block of blood flow towards the kidneys is a big limitation. In this work an innovative EVAR procedure is proposed, which involves the in-situ fenestration of a standard stentgraft with a fiber guided laser tool, controlled via an electromagnetic navigation system. Such a tool allows the surgeon to bring the laser directly inside to a previously released standard prosthesys using an endovascular instrument and there to selectively perforate its fabric avoiding damages to the aorta wall. The proper fenestration site can be addressed with the support of the navigation system, which tracks the tip of the fiber displaying it in a 3D model of the patient anatomy. The realization of the endovascular laser tool is presented, togheter with preliminary fenestration tests on graft-materials, including the effect of blood and tissues presence, and on the reliability of the electromagnetic sensors used to track the laser tool.