Dry adhesive patch with micro-absorbent hybrid structure capable of capturing and cleanly-adhering body-fluid and manufacturing method thereof

1. A dry adhesive patch comprising:

a plurality of embossed pillars formed on a substrate;

a hemi-spherical adsorbing cup defining a top portion of each pillar, wherein a hemi-spherical hole is defined in a top portion of the adsorbing cup and is exposed to an outside; and

an annular extension extending radially from an outer perimeter of a distal end of each adsorbing cup.

2. The dry adhesive patch of claim 1 , wherein a hydrogel is received in the hemi-spherical hole of the adsorbing cup.

3. The dry adhesive patch of claim 2 , wherein the hydrogel contains a hydrophilic functional group.

4. The dry adhesive patch of claim 2 , wherein the hydrogel includes at least one selected from a group consisting of polyacrylamide, polyaniline, polyethylene glycol, and alginate.

5. The dry adhesive patch of claim 2 , wherein the hydrogel has a porous chain network shape.

6. The dry adhesive patch of claim 2 , wherein the hydrogel occupies 70% or greater of a volume of the hole defined in the adsorbing cup.

7. The dry adhesive patch of claim 2 , wherein a diameter of the hemi-spherical hole defined in the adsorbing cup is smaller than a diameter of the adsorbing cup.

8. The dry adhesive patch of claim 2 , wherein the dry adhesive patch containing the hydrogel exhibits higher adhesive force in wet and dry environments than the dry adhesive patch free of the hydrogel exhibits.

9. The dry adhesive patch of claim 1 , wherein the dry adhesive patch having the annular extension exhibits higher adhesive force in wet and dry environments than the dry adhesive patch free of the annular extension exhibits.

10. A biological skin surface patch for capturing a body fluid, the patch including the dry adhesive patch of claim 2 .

11. The biological skin surface patch of claim 10 , wherein the biological skin surface patch further comprises:

a first electrode outwardly extending from the hole of the adsorbing cup;

a second electrode outwardly extending from the hole of the adsorbing cup, wherein the second electrode is spaced from the second electrode, wherein each of the first and second electrodes is in contact with the hydrogel; and

an electrical signal measuring unit connected to the first and second electrodes to measure an electrical signal to analyze a body fluid captured in the hydrogel.

12. A method for manufacturing a dry adhesive patch, the method comprising:

providing a mold substrate having embossed engraved patterns defined therein;

providing a film having a polymer precursor solution applied thereon;

placing the film on the mold substrate such that air is trapped in the embossed engraved patterns;

pressing a back face of the film to convert the trapped air to an air bubble;

curing the polymer precursor solution;

separating the cured polymer precursor from the mold substrate to form embossed pillars; and

stamping a sticky polymer onto a top face of each of the embossed pillars to form an adsorbing cup having an annular extension extending radially from a distal end thereof.

13. The method of claim 12 , wherein the method further comprises filling a hydrogel into the adsorbing cup.