Patent ID: 8617104

Claim:
A balloon catheter comprising: an inner shaft member having a proximal end portion, a distal end portion, and a length therebetween, the inner shaft member defining a guidewire lumen therein, the guidewire lumen having a distal port; an outer shaft member movable relative to the inner shaft member between an initial delivery condition and a deployed condition, the outer shaft member having a proximal end portion, a distal end portion, and a length therebetween, wherein the distal port of the guidewire lumen is exposed to an environment external to the outer shaft member when the inner shaft member is in the initial delivery condition relative the outer shaft member, and further wherein the distal end portion of the inner shaft member is proximal to the distal end portion of the outer shaft member in the initial delivery condition; an annular flow passage disposed between the inner and outer shaft members; a tip disposed at a distal end of the inner shaft member, the tip having a proximal end and a distal end; and a flexible membrane attached to the distal end portion of the inner shaft member proximal the proximal end of the tip and attached to the distal end portion of the outer shaft member, wherein the flexible membrane extends between the distal end portion of the inner shaft member and the distal end portion of the outer shaft member; wherein the flexible membrane includes an inner surface and an outer surface, the inner surface configured in fluid communication with the annular flow passage.