Patent ID: 8911491

Claim:
An exclusion device for excluding fluid contact to an abnormality in a body flow lumen, comprising: a body portion having opposed open ends; at least one aperture in said body portion located intermediate of said ends having a perimeter and a center location; and an extension configured to be positioned in said aperture and extending therefrom, said extension including an attachment portion receivable within said body portion and a tubular portion providing a secondary flow conduit from an interior of said body portion outwardly of said body portion, said attachment portion having a first profile area of a first size and having an outer perimeter, and a surface extending from an intersection of said tubular portion and said attachment portion to provide a sealing surface for engagement with an inner surface of said body portion; wherein said aperture includes a second profile area of a second size that is larger than an outer perimeter of the tubular portion at the intersection with the tubular portion in an expanded configuration, and is smaller than said first size, such that with the tubular portion in the expanded configuration sealed against a branch vessel wall, a maximum center offset deployment, which occurs when the tubular portion abuts the perimeter of the aperture in one location of the aperture but is spaced from the aperture perimeter at another location of the aperture with the attachment portion overlying the remaining area of the aperture and extending further outward over the inner surface of the body portion to engage and seal against the inner surface, is at least one centimeter.