What gases can be used as medical gases?

Oxygen is the most basic substance to maintain life, and is used in medical treatment to supplement oxygen for patients with hypoxia. Oxygen is also used in hyperbaric chambers for the treatment of diving sickness, gas poisoning, and for nebulizing medications. Carbon dioxide is used to inflate the abdominal cavity and colon for laparoscopy and fiberoptic colonoscopy. In addition, it is used in laboratories to culture bacteria (anaerobes). Solid carbon dioxide is used in cryotherapy for the treatment of cataracts and vascular disease. Argon and helium are used medically for surgical instruments such as argon knives and helium knives. Nitrogen is used medically to drive medical equipment and tools. A small amount of human inhalation of nitrous oxide has anesthesia and pain relief, major surgery is often to be used in conjunction with barbiturates, succinylcholine, opiates, cyclopropane, ether, etc. to enhance the effect.