Gamma Knife is a medical device that uses radiation (e.g. gamma rays) to focus on and destroy tumor foci in the body. It is widely used in the treatment of intracranial tumors because it is painless and bloodless, especially for the treatment of intracranial tumors, and therefore is widely used in the treatment of intracranial tumors by the medical profession of various countries. At present, the static gamma knife invented by Swedes is widely used in the world, and in September 1996, China successfully developed the rotary gamma knife, which successfully cured many patients with intracranial tumors. The cure rate is more than 90%.