Methods On the standpoint of the peculiar anatomic structure and the pathological changes of complex airway stenosis, we designed the inverted Y-shaped self - expandable metal stent.

When the metal wall is completely open, it turns a flat wall into a complex metal structure like a blooming metal flower, in memory of the punk and R&B culture.

Results prove that the degree of decoloring varies decreasingly with the dye structure in the(following) sequence: azo dyes, anthraquinone dyes, metal complex dyes, and cationic dyes.