The present invention relates to an endovascular prosthesis. An endovascular prosthesis is expandable from a first unexpanded state to a second expanded state, a first expandable portion biasing the first expandable portion against the blood vessel lumen, and a first expandable portion And a retractable leaf-like portion attached to. The retractable lobe includes at least one spine and a plurality of ribs attached to the spine. In a preferred embodiment of the endovascular prosthesis of the present invention, the retractable lobe-like portion is on the opposite side of the configuration straight to the longitudinal direction of the spine-like portion in the normal observation plane of the central axis of the prosthesis. A pair of attached ribs is configured to define a shape that is substantially non-circular in two dimensions. In another preferred embodiment of the endovascular prosthesis of the present invention, the retractable lobe is on the opposite side of the longitudinal configuration of the spine in the normal viewing plane of the central axis of the prosthesis. A pair of ribs attached to the two are configured to define a shape in two dimensions, through which a straight line is translated from one side of the shape to the other, A shape can be traversed only once at every point along the shape. The ribbed portion of the endovascular prosthesis of the present invention can be designed to provide an improved range of rotation of proper placement of the prosthesis with respect to the aneurysm opening. In a preferred embodiment, the rotation range may be as large as 45? A method for delivering an endovascular prosthesis to a bifurcated artery is also described, which can be performed using a single guidewire and a single delivery device. [Selection] Figure 5本発明は、血管内補綴物に関係する。血管内補綴物は、第１の非拡張状態から第２の拡張状態に拡張可能であり第１の拡張可能部分を血管腔に付勢する第１の拡張可能部分と、第１の拡張可能部分に取り付けられている引き込み可能な葉状部分とを備える。引き込み可能な葉状部分は、少なくとも１つの背骨状部分と背骨状部分に取り付けられた複数の肋骨状部分とを備える。本発明の血管内補綴物の好ましい一実施形態において、引き込み可能な葉状部分
