| 摘要 |
A drug injection needle 1 comprises a puncturing needle part 2 that has a puncturing part 21 that is capable of puncturing a body, a drug introducing needle part 3 that is capable of communicating with the inside of the drug container, and a housing 4 that supports the puncturing needle part 2 and the drug introducing needle part 3 in such a way as to allow the liquid drug to flow between the needle parts 2 and 3. The outer diameter of the puncturing part 21 is not more than 0.254 mm. The outer diameter of the drug introducing needle part 3 is larger than at least that of the vicinity of the distal end of the puncturing part 21 of the puncturing needle part 2, and a cutting edge 31 is formed at the end of the drug introducing needle part 3 for penetrating through an elastic member that is provided to seal the drug injection port of the drug container.
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