A medical device for injection during endoscopy or arthroscopy, the device having a curved, hollow needle, optionally coated by a semi-rigid covering, all surrounded by a curved tubular sleeve, wherein the needle is attached to a base, separated from the sleeve by one or more removable extensions or tabs, and a connection means for connecting either directly to a syringe for a liquid or semi-liquid treatment or to an extension tube connected to such a syringe.
