| 摘要 |
An injection needle comprises a base having a predetermined outer diameter and a predetermined inner diameter, a narrowed portion positioned in the front side of the base with an outer diameter and an inner diameter narrowed smaller than the outer diameter and the inner diameter of the base, respectively, and a narrowed tapered portion interposed between the base and the narrowed portion with an outer diameter gradually decreasing from the base toward the narrowed portion, wherein the narrowed portion is formed by inserting a core with an outer diameter corresponding to the inner diameter of the narrowed portion, into a metal needle pipe with an outer diameter consistent with the outer diameter of the base, to narrow the outer diameter by plastic deformation, and then by removing the core.
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