A medical device includes an expandable balloon including an outer surface. At least one flexible circuit is mounted on the outer surface of the expandable balloon. The at least one flexible circuit includes a first insulating layer (202), at least one heat sensing device positioned at least partially within the first insulating layer, a conductive layer (204) above the first insulating layer, at least a portion of which is electrically coupled to the heat sensing device, a second insulating layer (206) above the conductive layer and at least one electrode (222) associated with the conductive layer.
