Patent ID: 8790300

Claim:
A medical device comprising: a catheter shaft including a first tubular member and a second tubular member, the first tubular member including a proximal region, a distal region, and a lumen extending therethrough, the second tubular member including a proximal region, a distal region, and a lumen extending therethrough, the second tubular member being at least partially disposed within the lumen of the first tubular member, wherein the distal region of the second tubular member is configured to extend distally of the distal region of the first tubular member; a first balloon including a proximal waist coupled to an inner surface of the first tubular member; and a second balloon disposed about the first balloon and including a proximal waist coupled to an outer surface of the first tubular member; wherein the first tubular member includes one or more conduits in fluid communication with a space between the first balloon and the second balloon, wherein the first tubular member includes one or more radially extending openings for fluidly connecting the one or more conduits with the space between the first balloon and the second balloon.