Floating needle FSN is the abbreviation of floating needle therapy and its special tool disposable floating needle. Fu's subcutaneous acupuncture, the full name of floating needle therapy in English, was invented by Professor Fu Zhonghua during his work in the First Military Medical University on 1996.

Floating needle therapy has the characteristics of wide indications, safety, no side effects and quick response, and is mainly used to treat pain such as soft tissue injury, internal medicine and gynecology.

Floating needle therapy is a modern development of traditional acupuncture. From 1996 originated in Guangdong, to the inventor's introduction of myofascial trigger point theory during his doctoral period in Nanjing University, and then to the inventor's invention of floating needle insertion device during his postdoctoral period in Nanjing Military Medical General Hospital. The development of floating needle has gone through the stages of starting, diving and development.