Patent ID: 7758571

Claim:
An apparatus for thermally treating a hollow body organ comprising: a catheter having a proximal end and a distal end and defining at least one lumen therebetween; a guidewire comprised of a helically coiled structure which defines at least one passageway therethrough, wherein the guidewire has a free distal end projecting distally from the catheter lumen and is configured to have a first configuration when disposed within the lumen and a second radially extended configuration when withdrawn from the lumen such that the second configuration defines a plurality of helical loops formed by the coiled structure and which extend along a longitudinal axis which is coincident with a longitudinal axis of the catheter; a delivery tube disposable within the guidewire passageway for transporting a fluid, wherein the delivery tube defines at least one exit port near a distal end of the delivery tube through which the fluid passes; and, a membrane separate from the guidewire and disposed along the at least one passageway for containing the fluid therein.