| 摘要 |
A microneedle roller includes a plurality of discs, each of which comprises a first side surface, a second side surface and a center hole. The first side surface comprises a plurality of radial grooves, and the discs are stacked on one another in a way that the first side surface of one disc contacts the second side surface of the adjacent disc. The microneedle roller further includes a plurality of microneedles that are received in the radial grooves of the disc, and each of which has a pointed end. The pointed end protrudes beyond the outer circumference of the disc. The microneedle comprises an elongated cylindrical needle shank, a first sloped portion that starts from the pointed end, and a second sloped portion that is provided between the first sloped portion and the second sloped portion. The angle of the first sloped portion is greater. |
