A medical device is provided, having an elongate body defining a distal portion and a proximal portion； a first expandable member disposed on the distal portion of the elongate body and defining a cooling chamber therein, the first expandable member having a first rigidity； a second expandable member disposed around the first expandable member to define an interstitial region therebetween, where the second expandable member has a second rigidity less than the first rigidity； a gel disposed within the interstitial region； a coolant flow path in fluid communication with the cooling chamber； and a cryogenic coolant source in fluid communication with the coolant flow path.
