Shock wave was first used in the field of clinical medicine in extracorporeal shock wave lithotripsy, in the late 1980s, extracorporeal shock wave lithotripsy technology began to be used in the field of medicine, after more than ten years of clinical research, shock wave therapy is increasingly perfect, the scope of application is also increasingly expanded. As a new treatment modality between conservative therapy and surgical therapy, shock wave therapy is popular in Europe and the United States. Indications: Bone tissue diseases and strain diseases. Contraindications to shock wave: Patients with coagulation disorders in tumor patients. Treatment principle: The shock wave generated by the device is coupled into the body through water bladder or other ways to focus on the lesion to achieve treatment. Four different types of shock wave occurrence 1, treatment principle: (1) stress effect: shock wave has certain acoustic properties in the process of propagation, which will produce tension and pressure at different acoustic impedance interfaces, producing mechanical damage to the material, helping to loosen tissue adhesions and crush bone spurs. (2) Cavitation effect: Shock wave propagation in the medium will produce a series of cavitation bubbles, these cavitation bubbles in the process of growth, shock, collapse, releasing a large amount of energy. (3) Analgesic effect: activation of the production of p-substance, after a period of sustained action, the pain threshold increases, and the production of p-substance decreases. (4) Metabolic activation: shock wave changes the permeability of the cell membrane, accelerates the ion exchange process inside and outside the membrane, and accelerates the removal and absorption of metabolic breakdown products. (5) Other effects: osteogenic effect, pro-vascular growth factor production, etc. (2) Indications and contraindications (1) Indications Bone diseases: delayed fracture healing and bone discontinuity, adult early femoral head necrosis; soft tissue chronic injury diseases: biceps longus tendinitis, calcific supraspinatus tendinitis, humeral epicondylitis, humeral medial epicondylitis, plantar fasciitis, stopping point Achilles tendinitis, etc. (2) Relative indications Osteoarthritis, talar osteochondral injury, tenosynovitis, subacromial bursitis, prepatellar bursitis, patellar tendonitis, greater trochanteric bursitis, elastic ringing hip and myospasm, osteonecrosis diseases (lunar osteonecrosis, talar osteonecrosis, navicular osteonecrosis), etc. Other effects of shock wave Treatment of male sexual dysfunction (ED) treatment, cosmetology, fat reduction, etc. Contraindications 1, bleeding disorders: Patients with coagulation disorders may cause local tissue bleeding, and ESWT is contraindicated in patients with untreated, untreated or incurable bleeding disorders. 2, patients with thrombosis: The use of ESWT is prohibited in such patients to avoid dislodging of thrombus emboli, which may cause serious consequences. 3.Patients with growing pains: patients with severe cognitive impairment and mental illness. Equipment classification Shock wave therapy machine according to the different ways of shock wave generation, can be divided into the following four categories: 1, liquid electric type: water or other liquid electrode discharge, through the reflector will converge the energy to the second focus, now such equipment has been less production; 2, pneumatic ballistic type: the use of vibrators in the cavity at high speed to generate vibration, through the gun probe coupling into the body (the principle of the same nail gun, cement gun), such equipment The mechanical waves generated do not have focusing characteristics, also known as scattering shock wave therapy equipment; 3, electromagnetic: high-voltage pulse strong current through the coil to generate a magnetic field, pushing the movement of the shock membrane to generate shock waves to achieve focus, flat shot, or scattered into the body, the corresponding treatment; 4, piezoelectric ceramic type: the use of piezoelectric crystal material as a transducer, such devices are not yet available. Positioning The common positioning methods are pain feedback positioning, X-ray positioning, ultrasound positioning, and MRI positioning. The analgesic effect of shock wave therapy equipment is more obvious than other physical therapy equipment, and is especially good for treating frozen shoulder.