Memory elastic wire sleeve for peeling maxillary sinus membrane

A cannula with memory elastic filament for stripping away sinus mucosa, comprising:

• a primary stripping structure:
• and
• a secondary stripping structure,
• wherein said primary stripping structure comprises a hollow cannula and a stripping edge, the stripping edge connected on and fixed to a top of the hollow cannula,
• wherein said secondary stripping structure comprises an elastic filament,
• wherein, said elastic filament is made of a shape memory material with elasticity,
• wherein said elastic filament is folded into double strands and positioned in said hollow cannula, an upper end of said elastic filament extends out from the top of said hollow cannula, and two strands of a lower end of said elastic filament extend out of a bottom of said hollow cannula,
• wherein the two strands of the lower end of said elastic filament are separated with each other and can be controlled separately,
• wherein the shape of said stripping edge is an arc and the elastic filament is bent downward by said stripping edge when the elastic filament extends out of the hollow cannula, and
• wherein the upper end of said elastic filament that extends beyond said hollow cannula is variable in size, extension direction and shape by adjusting the two strands of the lower end of said elastic filament.