The present invention discloses a nitrogen gas pre-cooling throttle tumor ultra-low temperature therapeutic system. Said system adopts liquid nitrogen to pre-cool nitrogen gas, and its characterized by that after the normal-temperalure high-pressure nitrogen gas is introduced into the nitrogen gas injection electromagnetic valve, said nitrogen gas can be divided into two branches, on branch can be fed into interior liquid nitrogen Dewar vacuum vessel to lead out liquid nitrogen and make it be fed into pre-cooling heat exchanger to pre-cool the nitrogen gas; another branch can be passed through microparticle and aqueous vapor filter, then also divided into two branches, one branch can be pre-cooled by liquid nitrogen in pre-cooling heat exchanger, then inputted into frozen probe and further throttled and cooled; another branch can be heated by heating heat exchanger, then inputted into the frozen probe to heat the therapeutic region. Said invention can be extensively used in urological department, tumor department, department of dermatology, department of gynecology, chest surgery and others. |