What are the medical applications of oxygen, nitrogen and xenon respectively

Oxygen can be used in oxygen cylinders. Liquid nitrogen cools down the scalpel, which becomes a "cold knife". Doctors use "cold knife" to do surgery, can reduce bleeding or no bleeding, the patient can recover faster after surgery. The use of liquid nitrogen for patients to treat skin diseases, the effect is also very good. This is because the vaporization temperature of liquid nitrogen is -195.8 ℃, therefore, used to treat superficial skin diseases is often very easy to make the skin at the lesion necrosis, shedding. In the past, dermatologists often used "dry ice" to treat hemangiomas, although the intention is the same, but the coldness is far less than liquid nitrogen. Tuberculosis treatment "artificial pneumothorax", is also the nitrogen (or air) into the chest cavity of tuberculosis patients, compression of foci of the lobes of the lungs, so that it can rest. Xenon gas can also be used in laser technology