Device for freezing biological products

摘要

A freezing device for biological products comprises an impeller arranged at the top of a sleeve located above a basin of liquid nitrogen. The impeller causes a rising flow of nitrogen vapours within the sleeve and a descending flow outside it, the impeller and sleeve being arranged within a casing. When cooling is completed, the sleeve is lowered into the basin of liquid nitrogen. The invention is applied to the freezing of biological products stored in tubes, ampoules, phials, or straws arranged at the base of the sleeve.