| 摘要 |
Provided is a syringe for injecting a drug solution into an upper layer of skin that injects a drug solution such as a vaccine into an upper layer of skin, and particularly selectively into a relatively shallow site near an epidermic layer in a dermic layer to form a bulge without the occurrence of a leak from a skin surface, regardless of an age difference, a gender difference, and an individual difference, whereby a sufficient drug effect such as immunity elicitation capability can be obtained or exhibited even by a very small amount. The syringe for injecting a drug solution into an upper layer of skin 1 includes: an injection needle 20 provided with a needle hole 24 communicating from a needle tip 21 to a needle proximal end, and having a blade face 22 at the needle tip 21; and a needle hub 30 having a distal end portion 31c and a proximal end portion, and holding the injection needle 20 at the distal end portion 31c, wherein the needle hub 30 has a needle tip side end face 31b, and the needle tip 21 protrudes from the needle tip side end face 31b, and a protruding needle length L 1 of the needle tip 21 from the needle tip side end face 31b is 1.15 mm ± 0.1 mm, and a blade face length L 2 of the blade face 22 along an axis of the injection needle 20 is 0.60 mm ± 0.15 mm. |
