Hai Fu Knife, also known as Ultrasound Focused Knife, is the translation of "High-intensity focused ultrasound tumor treatment system (High-intensity focused ultrasound)". The name "Hai Fu knife" is also called "ultrasound focused knife". Abbreviated as "HIFU", this is a new technology that can kill tumors in the body without cutting the skin or puncture, which is also called "non-invasive surgery". Only intravenous analgesics and sedatives are given during treatment, and the dose of analgesic and sedative drugs is controlled during the treatment process, so that the patient can always maintain a state of communication with the doctor and reduce the risk of anesthesia-related complications and damage to neighboring organs.