Cryoprobe

A cryogenic probe comprising:

• a malleable elongated shaft at least partially housing or delineating a fluid supply conduit and a fluid exhaust conduit;
• a flexible insulated conduit circumscribing the malleable elongated shaft along a majority of its longitudinal length and extending distally beyond the malleable elongated shaft;
• a housing at least partially circumscribing at least a portion of a proximal end of the elongated shaft and receiving or delineating at least a portion of the fluid supply conduit and a portion of the fluid exhaust conduit;
• a flow restricting element in fluid communication with the fluid exhaust conduit, the flow restricting element regulating the flow of fluid through at least a portion of the fluid exhaust conduit;
• a distal ablation section including a closed distal end in fluid communication with the fluid supply conduit and the flow restricting element, and in selective fluid communication with the fluid exhaust conduit, the distal ablation section extending distally beyond the flexible insulted conduit;
• and
• a boiler comprising one or more channels providing fluid communication between the fluid supply conduit and an interior of the distal ablation section, the boiler comprising a central bore creating a fluid seal with an interior of the fluid exhaust conduit;
• wherein the flow restricting element comprises a valve extending into the boiler downstream from the distal ablation section, the valve comprising a valve plug configured to engage a valve seat and form a seal therebetween, the valve plug being spring-biased to engage the valve seat;
• and
• wherein at least a portion of the distal ablation section is circumscribed by the flexible insulated conduit.