Patent ID: 7641679

Claim:
A system for treating a diseased region of a blood vessel to a desired tissue treatment temperature range, the diseased region of the blood vessel having occlusive material with a thickness between a vessel lumen and a vessel wall, the system comprising: a balloon for positioning within the vessel adjacent the occlusive material; a cooling fluid source; a catheter body having a cooling fluid lumen, the cooling fluid lumen disposed along a cooling fluid path extending distally from the fluid source to an interior of the balloon and proximally from the balloon out of the vessel; a valve disposed along the cooling fluid path; a measurement apparatus for measuring the thickness of the occlusive material; and a controller coupled to the valve, the controller, in response to the thickness of the occlusive material, actuating the valve so as to cool the balloon below the target tissue temperature range such that the temperature of the vessel wall is within the target temperature range.