Fu's Subcutaneous Needle (FSN), invented by Dr. Zhonghua Fu in 1996, is an innovation for the treatment of myofascial pain and trigger points based on the research and clinical findings of Dr. D. Simons and Dr. Janet G. Travell.
Originating from Traditional Chinese Medicine (TCM), FSN does not follow the rules and principles of TCM and the chosen insertion points do not coincide with traditional acupuncture points. The similarities are limited to the distal insertion of the needle to the affected area, the needle itself being a non-injection needle, and the fact that both needles are manipulated and act on soft connective tissue. FSN abstains from the muscle and deep fascia layers and is confined to only the subcutaneous layer where collagen fibers are most abundant. As the subcutaneous layer is poorly innervated, pain is less than other needling therapies.