Patent ID: 7300433
Filing Date: 2007-11-27
Classification: A61B

Abstract:
1. A catheter comprising: an elongate catheter body, the elongate catheter body including a coolant injection tube, a primary coolant return lumen, and a secondary coolant return lumen, a first expandable member defined within the catheter body in fluid communication with the coolant injection lumen and the primary coolant return lumen, and a second expandable member disposed around the first expandable member to define an interstitial space therebetween, the interstitial space being in fluid communication with the secondary coolant return lumen, wherein the first expandable member has an outer surface and the second expandable member has an inner surface, and wherein at least one of (i) the inner surface of the second expandable member, and (ii) the outer surface of the first expandable member includes one or more surface modification elements extending into the interstitial space.