The biggest demand for gas in the medical field is medical oxygen, which is needed in the process of patient rescue and treatment. Usually large hospitals rent several liquid oxygen reserve systems, which are supplied centrally through pipe networks. Some remote plateau areas use PSA oxygen generators to obtain oxygen, while some small hospitals use steel bottles to supply oxygen. In addition, nuclear magnetic resonance equipment also needs helium to reduce the ambient temperature to near absolute zero, so that the equipment can produce superconducting capabilities. Liquid nitrogen liquid carbon dioxide also has certain uses in the treatment and biological refrigeration process.