Patent ID: 8052741

Claim:
A main prosthesis and a branch prosthesis assembly comprising: a main prosthesis configured for placement in a main vessel, the main prosthesis including an outer surface, an inner surface, and a side opening having a perimeter; and a branch prosthesis configured for placement in a branch vessel that extends from the main vessel, the branch prosthesis having a radially compressed first configuration and a radially expanded second configuration, the branch prosthesis including: an expandable tubular body portion with a first outer diameter in the second configuration, the body portion having a proximal end and a distal end; an expandable annular flange coupled to the proximal end of the body portion, the flange having a second outer diameter in the second configuration that is greater than the first outer diameter; and a sealing sleeve extending proximally from the expandable flange, wherein the sealing sleeve is a generally straight cylindrical hollow shape in the first configuration and the sealing sleeve is a rolled-up coil with a proximal end having at least a 270 degree turn towards the flange in the second configuration, wherein in the second configuration, the annular flange engages the outer surface of the main prosthesis around the perimeter of the side opening and the sealing sleeve engages the inner surface of the main prosthesis around the perimeter of the side opening to form a seal between the main prosthesis and the branch prosthesis.