Patent ID: 7938799

Claim:
A medical device comprising: a tube having a proximal end, a distal end, an outer surface between the proximal end and the distal end, and a lumen; an inflatable balloon disposed on the outer surface of the tube between the proximal end and the distal end and axially aligned with the tube, the balloon having an outer surface, and the balloon inflatable from a first position to a second position; and an expandable structure axially aligned with the tube and in physical contact with the outer surface of the inflatable balloon, the expandable structure comprising: a plurality of struts; a membrane disposed between and connected to the first plurality of struts; wherein the struts and the membrane form a sealing ring at a distal region of the expandable structure; wherein the expandable structure is expandable by the balloon from a first position to a second position; wherein the expandable structure is expanded to the second position when the inflatable balloon is inflated to the second position; wherein the diameter of the expandable structure in the second position is substantially greater than the diameter of the inflatable balloon in the second position; and wherein, when the expandable structure is in the second position, the sealing ring of the expandable structure contacts the inner surface of the vessel with sufficient pressure to substantially prevent passage of fluid through the vessel.