Dry bonding system and wearable device for skin bonding including the same

1. A bonding device, comprising:

cylindrical micro structures each extending from a substrate and having a terminal end,

wherein each of the micro structures includes a chamber extending into the terminal end, and

wherein a diameter of an opening of the chamber at the terminal end is smaller than a diameter of the terminal end,

wherein a protuberance extends from a floor of the chamber,

wherein a circumference of a middle portion of the protuberance is larger than each of a circumference of an upper end of the protuberance and a circumference of a lower end of the protuberance, and

wherein the circumference of the middle portion of the protuberance is smaller than a circumference of the chamber.

2. The bonding device of claim 1 , wherein each of the micro structures includes a material selected from the group consisting of polyurethaneacrylate, polydimethylsiloxane, polyethyleneterephthalate, polyurethane, polyethylenenaphthalate, and a combination thereof.

3. The bonding device of claim 1 , wherein the chamber is a sucker chamber.

4. The bonding device of claim 1 , wherein the protuberance is spherical or semi-spherical.

5. The bonding device of claim 1 , wherein the protuberance has a diameter of 1 μm to 100 μm and has a height of 1 μm to 100 μm, and an aspect ratio of the diameter to the height is within a range of ⅔ to 3.

6. The bonding device of claim 1 , wherein adjacent micro structures among the micro structures are spaced apart from each other at an interval, and a ratio of the interval to a diameter the chamber is within a range of 1:1 to 1:3.

7. A wearable device for skin bonding comprising a sensor part and a bonding part provided at a side of the sensor part,

wherein the bonding part includes the bonding device according to claim 1 .

8. A skin bonding patch comprising the bonding device according to claim 1 .

9. The skin bonding patch of claim 8 , wherein the skin bonding patch includes a moist wound healing dressing.

10. A drug delivery bonding patch comprising the bonding device according to claim 1 .

11. The drug delivery bonding patch of claim 10 , wherein the bonding device includes a drug disposed in the chamber.

12. A bonding device, comprising:

holes extending into a flat substrate; and

a protuberance formed on a floor of each of the holes,

wherein the protuberance has a height smaller than a depth of each of the holes,

wherein a circumference of a middle portion of the protuberance is larger than each of a circumference of an upper end of the protuberance and a circumference of a lower end of the protuberance, and

wherein the circumference of the middle portion of the protuberance is smaller than a circumference of each of the holes.

13. The bonding device of claim 12 , wherein the protuberance is contained within each of the holes.

14. The bonding device of claim 12 , wherein each of the holes has a diameter of 1 μm to 100 μm and has a height of 1 μm to 100 μm, and an aspect ratio of the diameter to the height is within a range of ⅔ to 3.