| 摘要 |
PROBLEM TO BE SOLVED: To improve the operability of a syringe having no needle by reducing the friction of a screw member used for storing elastic energy in a spring. SOLUTION: This syringe having no needle is engaged with a male screw part 6a formed in a sheath 6 provided in the fixed end side of a compression spring 10, moved in a screw pitch direction by rotating a female screw part 4a formed in a grip 4 fixed to a cylinder 2 and, when the compression spring 10 is compressed, since the surface of at least one of the male and female screw parts 6a and 4a is made of a low friction material, a screw rotational operation is made smooth. |
