PROBLEM TO BE SOLVED: To provide a manufacturing method for a medical needle, by which a processed surface obtained by processing one end part of a metallic base material becomes smooth and sharp, and also an oxide formed on the processed surface can be reduced.SOLUTION: A manufacturing method for a medical needle includes: a main processing step of processing a needle-shaped metallic base material having a processed surface obtained by processing one end part thereof, with plasma generated in the atmosphere filled with a mixed gas containing a main gas and a reaction gas and a post-processing step of processing the metallic base material after the main processing, with plasma generated in the atmosphere filled with the main gas, for a predetermined short period of time which is shorter than the time taken in the main processing step. The main gas is a gas in which, when plasma is generated, inactive ions not producing an oxide when reacted with the metallic base material are generated, and active ions producing the oxide when reacted with the metallic base material are not generated. The reaction gas is a gas in which, when plasma is generated, at least the active ions are generated.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】金属製基材の一端部に加工して得た加工面の平滑化及び鋭利化に加えて、この加工面上に形成される酸化物を低減可能な医療用針の製造方法を提供することである。【解決手段】一端部に加工して得た加工面を備える針状の金属製基材を、主要ガス及び反応ガスを主成分とする混合ガスで満たされた雰囲気内で発生させたプラズマによって処理する本処理工程と、前記本処理工程後の前記金属製基材を、前記本処理工程より短い所定時間の間、主要ガスで満たされた雰囲気内で発生させたプラズマによって処理する後処理工程と、を含み、前記主要ガスは、プラズマを発生させた際に、当該金属製基材と反応して酸化物を生成しない不活性イオンが発生すると共に、前記金属製基材と反応して酸化物を生成する活性イオンが発生しない気体であり、前記反応ガスは、プラズマを発生させた際に、少なくとも前記活性イオンが発生する気体である。【選択図】図1
