Tenosynovitis, also known as “snapping finger” or “trigger finger”, is a common clinical condition of chronic soft tissue injury of the hand, which can occur in any finger, usually in the thumb, thumb and middle finger, and in a few patients it can occur in multiple fingers at the same time. It is usually seen in computer operators, manual workers (carpenters, packers, weavers, accountants). Clinical manifestations: limited voluntary flexion and extension of the affected finger, painful flexion and extension of the finger with force, bouncing action, such as pulling the trigger, with a popping sound. In severe cases, tendon entrapment can occur, the affected finger is passively fixed in the flexion or extension position, unable to move on its own, and requires the help of the healthy hand to move, with symptoms increasing in the morning and after labor, and can be relieved after activity or hot compresses. Etiology: The tendon sheath of the finger flexor tendon is composed of a layer of fibrous sheaths around the finger flexor tendon, namely the tendon sheath; and a bony shallow groove on the palmar side of the metacarpophalangeal joint and a bony sheath composed of transverse fibrous tissue local to the flexor tendon sheath, namely the tendon sheath slide. It plays a restraining and protective role for the flexor tendon. When the patient is engaged in long-term hand labor or local pressure, the finger flexor tendon and tendon sheath repeatedly rubbed, squeezed local congestion, edema, followed by local degeneration, adhesions, so that the tendon sheath local narrowing, forming a buttonhole shape. The finger flexor tendon is squeezed and thinned, and the two ends are expanded into a gourd shape. When the finger flexes and extends, the enlarged part of the tendon passes through the narrow tendon sheath carriage, and then the bouncing action of the finger occurs, and causes pain, resulting in limited flexion and extension of the affected finger. When the tendon sheath is degenerated and the adhesions are heavy, it will cause the finger flexor tendon to be embedded, and the affected finger will be fixed in the flexion or extension position passively, and it will be difficult to move. Commonly used treatment methods: local topical or with internal blood anti-inflammatory drugs; or the local lesion to take closed injection anti-inflammatory; or local physiotherapy, hot compress, acupuncture, massage and other treatments, although there is a certain degree of effectiveness, but individual differences, and the efficacy is uncertain, it is easy to relapse. In the past, for patients with finger flexor tendon entrapment or typical “trigger finger” sign during finger movement, most of them took finger flexor tendon tendon sheath slide local lesion excision and tendon release surgery treatment. However, there are problems such as greater surgical damage, longer recovery time, and scar adhesions of the surgical incision.