PROBLEM TO BE SOLVED: To provide a needle cannula for the injection of liquid medicine such as anesthetic solution to relieve a pain in an introversion method to be used in the removal of veins in the large saphenous vein (LSV) and small saphenous vein (SSV) and not limited to that, during and after accompanying a strip procedure in conventional stripping operations, a hemostatic solution and the like capable of injecting them effectively and easily along the LSV and SSV. SOLUTION: The needle cannula for the injection of liquid medicine comprises the following features: 1. a curved shape is previously formed, and the needle cannula has at least a small opening for the injection of pharmaceutical solution at the leading edge portion, and the leading edge portion has a round structure so as not to puncture living tissues. 2. It has such flexibility to allow a curved formation by the use of a human hand and has at least a small opening for the injection of pharmaceutical solution at the leading edge portion. Further, it has a round structure at the leading edge portion so as not to puncture living tissues.
