Microneedle device
A microneedle device includes a substrate and a plurality of microneedle structures. The substrate is provided with a first surface, where the first surface has a surface roughness ranged from 0.05 μm to 2.0 μm. The plurality of microneedle structures are configured on the first surface. Because the surface of the microneedle device has a surface roughness of 0.05 μm to 2.0 μm, a film can be formed completely.
1 . A microneedle device, comprising:
a substrate, having a first surface, wherein the first surface has a surface roughness ranged from 0.05 μm to 2.0 μm; and
a plurality of microneedle structures, arranged on the first surface;
wherein the first surface has a first texture, the first texture comprises a plurality of first patterns, and each of the first patterns encircles each of the microneedle structures;
each of the first patterns has a plurality of circles, each of the circles has a center of a circle, the centers of circles are arranged along a circular trace encircling each of the microneedle structures, and the circles adjacent to each other are overlapped with each other; and
there is a gap ranged from 0.01 mm to 0.2 mm between the centers of circles of the circles adjacent to each other.
2 . The microneedle device according to claim 1 , wherein each of the microneedle structures has a second needle-like surface, and the second needle-like surface has a surface roughness ranged from 0.05 μm to 2.0 μm.
3 . The microneedle device according to claim 2 , wherein the second needle-like surface has a second texture; the second texture comprises a plurality of curves, and the curves are arranged in a direction away from the first surface from a side close to the first surface.
4 . The microneedle device according to claim 3 , wherein there is a gap ranged from 0.01 mm to 0.2 mm between the curves adjacent to each other.
5 . The microneedle device according to claim 2 , wherein the second needle-like surface has a second texture, the second texture has a curve, and the curve encircles the second needle-like surface in a direction away from the first surface from a side close to the first surface to form a spiral shape.
6 . The microneedle device according to claim 1 , wherein a material of the substrate and the microneedle structures comprises a metal.
7 . The microneedle device according to claim 1 , wherein a material of the substrate and the microneedle structures comprises a soluble macromolecular material.