Revitalization and application of ancient round-sharp needle based on Nèijīng

The emergence of nine needles in Nèijīng (, The Inner Classic) laid a foundation for the formation and development of needling instruments and acupuncture manipulation in later ages, but the application of nine needles was not realized during clinical practice of acupuncture-moxibustion in later ages. Round-sharp needle is one of the nine needles. In this study, round-sharp needle was taken as an example to introduce the excavation and revitalization of nine needles and diagnosis and treatment rules explored by Mr. CHEN Li-xin according to The Inner Classic. The needle shape, needling manipulation and clinical application of round-sharp needle based on The Inner Classic were described in detail.