Patent ID: 8690823

Claim:
A balloon catheter comprising: an inner shaft member having a proximal end portion, a distal end portion, and a length therebetween; an outer shaft member movable relative to the inner shaft member between a delivery condition and a deployed condition, the outer shaft member having a proximal end portion, a distal end portion, and a length therebetween, wherein in the delivery condition the distal end portion of the inner shaft is distal to the distal end portion of the outer shaft; an annular flow passage disposed between the inner and outer shaft members; and a flexible membrane attached to and extending 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; and wherein the flexible membrane includes a proximal driver segment, a distal driver segment and a delivery segment therebetween, the proximal driver segment being proximal to the distal driver segment with the delivery segment therebetween in both the delivery condition and the deployed condition, and wherein the proximal driver segment and the distal driver segment are configured to enfold and define at least a portion of a chamber to receive the delivery segment when in the delivery condition.