A novel tumor cryoablation catheter

The present invention relates to a novel tumor cryoablation catheter, comprising a balloon and a conduit connected to the proximal end of the balloon, said heat-insulating layer covering the outer conduit, said conduit comprising a pipe and a return inlet line way, the intake pipe extending into the distal end of the balloon body, the balloon includes a distal surface of the distal end, during an ablation procedure, the cooling medium inlet line input the expansion of the balloon, the expand said distal face, the distal end of the balloon is formed plane, the proximal portion of the balloon body is hemispherical bulges, the cooling medium through the return line to reflux. The present invention extends into the inlet line balloon body, to ensure the cold source can be sufficiently released, enhancing the heat exchange cooling source, improving cooling effect; when filling the balloon, the balloon distal small deformation, to ensure that the balloon distal end surface plane, the device to avoid contact with human tissue and the expansion of the freezing range to enhance the cooling effect, better effect of tumor volume for larger applications.