A fenestrated graft deployment system, with a delivery catheter having a catheter body, An endoluminal prosthesis having a main graft body, the main graft body having a lumen therethrough and a first opening laterally through a wall of the main graft body. A first guidewire prepositioned within the delivery catheter extending through at least a portion of the catheter body into a main lumen of the endoluminal prosthesis and through the first opening in the wall of the prosthesis when the delivery catheter is in a predeployed configuration. A first fenestration alignment device is configured to extend through at least a portion of the delivery catheter and is configured to be axially moveable relative to the first guidewire. The first fenestration alignment device has an end portion having an outside perimeter configured such that when an end portion of the fenestration alignment device moves toward the first opening of said main graft body the outside perimeter of the first opening is smaller than the outside perimeter of the first fenestration alignment device and prevents it from passing through the first opening and causes the main graft body adjacent to the first opening to move with the end of the first fenestration alignment device to act as alignment tool to allow an operator to align the first opening in the side of the endoluminal prosthesis with an ostium of a target branch vessel into which said first opening is to extend and act as a guide and seal for a subsequently delivered branch graft endoluminal prosthesis.カテーテル本体を有する送出カテーテルと、ルーメンが貫通されて成る主グラフト本体と該主グラフト本体の壁を側方から貫通する第１の開口とを有する管腔内プロテーゼと、伴う開窓付きグラフト配置システム。送出カテーテル内に予め位置される第１のガイドワイヤが、カテーテル本体の少なくとも一部を通じて管腔内プロテーゼの主ルーメン内へと延びるとともに、送出カテーテルが事前配置形態にあるときにプロテーゼの壁の第１の開口を通じて延びる。第１の開窓位置合わせ装置が、送出カテーテルの少なくとも一部を通じて延びるように構成されるとともに、第１のガイドワイヤに対して軸方向に移動できるように構成される。第１の開窓位置合わせ装置は、開窓位置合わせ装置の端部が前記主グラフト本体の第１の開口へ向けて移動するときに第１の開口の外周が第１の開窓位置合わせ装置の外周よりも小さく且つ第１の開窓位置合わせ装置の第１の開口の通過を防止するように設定される外周を有する端部を有するとともに、第１の開口に隣接する主グラフト本体を第１の開窓位置合
