Endoleak preventing stent graft system

An endoleak preventing stent graft system, comprising:

• a metal mesh support layer fit for the shape of said artery blood vessel;
• a cover film layer covering the surface of said metal mesh support layer;
• and
• a villus layer covering outside said cover film layer, said villus layer fills up the gap formed between said cover film layer and the inwall of said artery blood vessel under the effect of the flexibility of itself.

An endoleak preventing stent graft system, used for preventing the endoleaks except for type II endoleak, comprising:

• a metal mesh support layer fit for the shape of said artery blood vessel;
• a cover film layer covering on said metal mesh support layer;
• and
• a sponge layer positioned outside said cover film layer, said sponge layer fills up the gap formed between said cover film layer and the inwall of said artery blood vessel under the effect of the flexibility of itself.