Patent ID: 8029449

Claim:
A catheter system comprising: a catheter shaft including a proximal region and a distal region, the catheter shaft defining a supply lumen; a first balloon disposed about the distal region of the catheter shaft and having a wall with an outer surface and an inner surface, wherein the inner surface defines a first cavity that is in fluid communication with the supply lumen; a second balloon disposed over the first balloon and defining a thermal barrier therebetween, wherein a vacuum space is defined between the first balloon and the second balloon; an inflation supply in fluid communication with the supply lumen of the catheter shaft, wherein the inflation supply is configured to provide a fluid to the first cavity for expanding the first balloon; a fluid shutoff mechanism coupled to the supply lumen and configured to inhibit flow of the fluid through the supply lumen in response to a change in the vacuum space; and a plurality of temperature sensors coupled to the second balloon so as to provide temperature measurements.