Patent ID: 6517533
Filing Date: 2003-02-11
Classification: A61B,A61M

Abstract:
A catheter for controlling tissue remodeling or proliferation at a tissue site comprising:an outer balloon located on a distal end of the catheter; a first lumen in fluid communication with the outer balloon at a distal end and fluidly connected to a source of liquid at a proximal end for expanding the outer balloon with liquid to contact the tissue site; a second lumen fluidly connected to a source of coolant fluid at a proximal end for transporting the coolant fluid to a distal end of the second lumen to cool the liquid in the outer balloon and thereby the tissue site to a cryo-therapeutic temperature; and an inner balloon in fluid communication with the distal end of the second lumen in close proximity to the outer balloon; a third lumen surrounding at least a portion of the second lumen and in fluid communication with the inner balloon for removing the coolant fluid from the inner balloon; wherein the second lumen includes an orifice configured and dimensioned to allow the coolant fluid to expand as it passes therethrough to reduce coolant fluid temperature; and the fluid communication between the second lumen and the inner balloon is through the orifice to allow the coolant fluid to expand into the inner balloon.