Liquid medium minimally invasive cold knife system

The invention provides a liquid medium minimally invasive cold knife system, and belongs to the field of medical appliances. The system comprises a cutting head 1, an infusion tube 2, a liquid return tube 3, an insulation tube 4, a hot liquid return tube 5, a cold liquid return tube 6, a liquid collection header 7, a hot liquid supply tube 8, a cold liquid pump 9, a hot liquid pump 10, a hot liquid tank 11, a cold liquid tank 12, a refrigerating medium tank 13 and an electric heater 14. When a cancer operation is carried out, the cutting head 1 is inserted into the tissue of a cancer focus, and the cold liquid pump 9 and the hot liquid pump 10 are opened; after a cold medium at about 100 DEG C is injected into the cutting head 1 through the infusion tube 2, the liquid medium flows back to the cold liquid tank 12 through the liquid return tube 3, the tissue of the cancer focus is frozen in several minutes to obtain ice cubes, the cold liquid pump 9 is closed, the valve on the hot liquid supply tube 8 is opened