A system and method for treating a vascular condition includes a conduit
having an inner wall defining lumen and a replacement valve device. The
replacement valve device includes a prosthetic valve connected to an
expandable support structure; the expandable support structure includes
at least one valve attachment portion and a plurality of valve attachment
devices. Each valve attachment portion includes a plurality of struts,
each strut having at least one opening for receiving one of the plurality
of valve attachment devices.