Abstract: The disclosure provides a flexible cryoablation needle device resistant to a low temperature and a high pressure, a threaded part is arranged on the outer wall of a liner pipe to enhance a connection strength between the liner pipe and a flexible pipe structure. Since an annular protrusion portion is arranged on the outer wall of the liner pipe, further leakage of a gas coming from a pressure relief process is prevented and the connection strength is enhanced as well. Air tightness and connection strength are further guaranteed by radial extrusion of extruding pipes. And an inner cavity in a cutter head is directly subjected to pressure relief through a cutter head vent, a pressure relief intermediate cavity, a liner vent, a flexible pipe vent and a pressure relief gap.

Abstract: Disclosed is an adjustable cryoablation needle, comprising a needle rod (3), a front-segment heat-insulated tube (1), a rear-segment heat-insulated tube (2), and an gas inlet structure (7) penetrating the needle rod (3) and the front-segment heat-insulated tube (1), wherein the needle rod (3) can move relative to the rear-segment heat-insulated tube (2) in the axial direction of the rear-segment heat-insulated tube (2) so as to adjust a first axial distance between the front end of the rear-segment heat-insulated tube (2) and the front end of the needle rod (3); and the front-segment heat-insulated tube (1) can move relative to the rear-segment heat-insulated tube (2) in the axial direction of the rear-segment heat-insulated tube (2) The adjustable cryoablation needle can prevent the inconvenience caused by a doctor selecting the model of the cryoablation needle.

Abstract: The disclosure provides a flexible cryoablation needle device resistant to a low temperature and a high pressure, a threaded part is arranged on the outer wall of a liner pipe to enhance a connection strength between the liner pipe and a flexible pipe structure. Since an annular protrusion portion is arranged on the outer wall of the liner pipe, further leakage of a gas coming from a pressure relief process is prevented and the connection strength is enhanced as well. Air tightness and connection strength are further guaranteed by radial extrusion of extruding pipes. And an inner cavity in a cutter head is directly subjected to pressure relief through a cutter head vent, a pressure relief intermediate cavity, a liner vent, a flexible pipe vent and a pressure relief gap.