I am a student in Tangshan, Hebei. I learned the trocar knife from teacher Shi. The needle is relatively small. With the help of intubation, the pain is less and the treatment of soft tissue injury is ok. General patients only need 1-3 times, and individual patients need 3-6 times of treatment. It's less painful than acupuncture because it only involves lifting, inserting and twisting. Because the effect of minimally invasive drainage with front edge is better than acupuncture, there are relatively few indications at present, and it can only treat diseases such as pain caused by soft tissue injury. I think this is also a great progress.