Patent ID: 8162929

Claim:
A fluid refrigerant delivery system for a cryoablation applicator which comprises: a source of fluid refrigerant; and a tube shaped cryoablation segment having a proximal end and a distal end with a lumen formed therebetween and with the proximal end operably connected in fluid communication with the fluid refrigerant source, and wherein the segment is formed with a first exhaust port and a second exhaust port with the second exhaust port positioned distal to the first exhaust port, wherein the first exhaust port has a port diameter D and the second exhaust port has a port diameter d, with the second exhaust port diameter being larger than the first exhaust port diameter (d>D), such that the segment is configured to outflow fluid refrigerant at the first and second exhaust ports at substantially the same refrigerant mass flow rates for subsequent transition of the fluid refrigerant from a liquid state to a gaseous state.