| 摘要 |
A luer-lock type cylindrical tip of a syringe has a luer tip of which a cent er portion is fitted with an injection needle and a-luer-lock portion which is disposed outside the luer tip with a gap therebetween and which has a lock screw disposed therein. The lock screw is formed as a trapezoid screw having a root diameter set to the range of 8.0 mm ~ 0.1 mm, an inner diameter set to the range greater than or equal to 6.6 mm and smaller than 6.8 mm, and a pitch set to the range greater than 2.5 mm and smaller than or equal to 2.8 mm. Accordingly, it is possible to reliably prevent the injecti on needle from being loosened or pulled out in the handling process. It is also possib le to easily replace the syringe needle with another one having different size at the tim e of use.
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