Freezing ablation catheter assembly and cryoablation system

摘要

And a catheter having a coolant discharge area, cryoablation catheter assembly, to receive the coolant transfer pipe and the guide tube. And receiving the refrigerant from the refrigerant source, the refrigerant transfer tube transports to the extension element connected to the distal portion of the catheter. The extension element, so as to define an expansion element space expansion space between elements, the inside of the inner layer, extension element comprises an outer layer disposed over the inner layer between the inner and outer layers. Extension element space is communicated with the refrigerant fluid transfer tube and the coolant discharge area to flow. Expansion space between elements is in fluid communication with the fluid path for transporting the fluid to the fluid source drawer. Pressure regulating system is disposed along the fluid path, with the check valve at least one, to passively adjust the pressure of the space between extensions.