Furcated endovascular prosthesis

Claim 1

An endovascular prosthesis comprising: a trunk portion having a first end, a second end, and a trunk lumen extending between said first end and said second end of said trunk portion, said trunk portion including a radially expandable support, an inner layer of fabric which at least partially defines said trunk lumen, and an outer layer of fabric which at least partially defines an outer side of said trunk portion, said radially expandable support being at least partially disposed between said inner and outer layers of fabric; a furcated portion connected to said second end of said trunk portion, said furcated portion including a plurality of branches extending from said second end of said trunk portion and having branch lumens in fluid communication with said trunk lumen, said inner layer of fabric at least partially defines said branch lumens, said outer layer of fabric at least partially defines outer sides of said branches; said trunk portion is formed by a number of sections equal to the number of branches in said furcated portion, said sections of said trunk portion being interconnected by a plurality of continuous seams which are free of corners along their length and which interconnect said inner and outer layers of fabric, a first end of each of said seams being disposed on a central axis of said trunk portion at an intersection of said furcated portion, a second end of each of said seams being disposed at said first end of said trunk portion and spaced from the central axis of said trunk portion, each one of said seams having an arcuately curving portion which extends from the first end of said one seam into said trunk portion and a linear portion which extends from the arcuately curving portion of said one seam to the second end of said one seam, said inner and outer layers of fabric extend from said first end of said trunk portion to ends of said branches which are spaced furthest from said trunk portion; and a plurality of tubular outflow limbs each of which is telescopically connected with one of said branches, each of said outflow limbs extends from one of said branches and has a limb lumen in fluid communication with said trunk lumen, each of said outflow limbs having a radially expandable limb support, an inner layer of fabric which at least partially defines said limb lumen, and an outer layer of fabric which at least partially defines an outer side of said limb, said radially expandable limb support of each one of said outflow limbs being at least partially disposed between said inner and outer layers of fabric of said one outflow limb.