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The wound is prone to breed bacteria if band-aid is not replaced in time, in the airtight environment. Traditional band-aid does not give any hints about the recovery condition , and thus users could not know the time to replace it.
Smiley Band-Aid is a band-aid, which could indicate the hygiene of wound by displaying changes over expression on the pattern layer. Under the safe condition, smile would be displayed; but when the density of bacteria raise up to a limit, the smile face would change into weeping. Smiley Band-Aid visualizes the situation of treatment, maintaining the safe and hygiene usage of band-aid.
Zishuo Fang Jieyu Jiang Yuehua Zhuang Cheng Chi Shang Tong Tengwen Hu