Endovascular cryotreatment catheter

Abstract From the Canadian patent

An elongated catheter device with a distal balloon assembly is adapted for endovascular insertion. Coolant injected through the device may in different , embodiments, directly cool tissue contacting the balloon or may cool a , separate internal chamber. Plural balloons may be provided wherein a , secondary outer balloon surrounds a primary inner balloon the primary balloon , being filled with coolant and acting as the cooling chamber the secondary , balloon being coupled to a vacuum return lumen to serve as a robust leak containment device and thermal insulator around the cooling chamber. One or more sensors may be disposed between the balloons or the vacuum return lumen to detect leaks …