Stent graft

Abstract

A stent graft. The stent graft is provided in the axial direction thereof with at least one region T, and the region T includes a number of wavy rings; in the circumferential direction, the region T includes a region A and a region B that is connected to the region A, the ratio of the area of the region A to the area of the region T being ¼-⅔, the ratio of the coverage rate of the wavy rings in the region A to the coverage rate of the wavy rings in the region B being ⅕- 9/10, and the ratio of the coverage rate of the wavy rings within any circular region having a diameter of 20 mm within the region A to the coverage rate of the wavy rings in the region A being 0.7-1.3.

1 - 10 . (canceled) 
     
     
         11 . A stent graft, comprising: at least one region T disposed along an axial direction of the stent graft; the region T comprises a plurality of wavy rings; the region T further comprises, in a circumferential direction, a region A and a region B connected with the region A; the ratio of the area of the region A to the area of the region T ranges from ¼ to ⅔; the ratio of the coverage rate of the wavy rings in the region A to the coverage rate of the wavy rings in the region B ranges from ⅕ to 9/10; and the ratio of the coverage rate of the wavy rings in any circular region with a diameter of 20 mm within the region A to the coverage rate of the wavy rings in the region A ranges from 0.7 to 1.3. 
     
     
         12 . The stent graft of  claim 11 , wherein the ratio of the area of the region A to the area of the region T ranges from ⅓ to ½; the ratio of the coverage rate of the wavy rings in the region A to the coverage rate of the wavy rings in the region B ranges from ⅖ to 9/10; and the ratio of the coverage rate of the wavy rings in any circular region with a diameter of 20 mm within the region A to the coverage rate of the wavy rings in the region A ranges from 0.9 to 1.1. 
     
     
         13 . The stent graft of  claim 11 , wherein that the region A comprises a plurality of first wavy segments arranged in a spaced manner along the axial direction, a wave height of the first wavy segment is L 1 , a spacing between the adjacent first wavy segments is L 2 , and L 1 /L 2  is greater than or equal to ¼ and less than or equal to 3. 
     
     
         14 . The stent graft of  claim 13 , wherein L 1  is greater than or equal to 4 mm and less than or equal to 12 mm. 
     
     
         15 . The stent graft of  claim 13 , wherein the wave heights of the plurality of first wavy segments are equal, and the spacings between the adjacent first wavy segments are equal. 
     
     
         16 . The stent graft of  claim 13 , wherein the region B comprises keel regions and non-keel regions that are distributed along the circumferential direction, each non-keel region comprises a plurality of second wavy segments distributed along the axial direction, each keel region comprises a plurality of third wavy segments distributed along the axial direction, and the wave heights of the third wavy segments are greater than the wave heights of the first wavy segments and the wave heights of the second wavy segments. 
     
     
         17 . The stent graft of  claim 16 , wherein the ratio of the wave height of the second wavy segment to the wave height of the first wavy segment ranges from 0.8 to 1.2, and the ratio of the spacing between the adjacent second wavy segments to the spacing between the adjacent first wavy segments ranges from 0.8 to 1.2. 
     
     
         18 . The stent graft of  claim 16 , wherein the wave included angle of the third wavy segment is less than the wave included angle of the first wavy segment and the wave included angle of the second wavy segment. 
     
     
         19 . The stent graft of  claim 16 , wherein the included angle of the keel region in the circumferential direction is 15°-45°. 
     
     
         20 . The stent graft of  claim 11 , wherein the stent graft further comprises an anchoring bare stent located at at least one end of the stent graft. 
     
     
         21 . The stent graft of  claim 12 , wherein the region A comprises a plurality of first wavy segments arranged in a spaced manner along the axial direction, a wave height of the first wavy segment is L 1 , a spacing between the adjacent first wavy segments is L 2 , and L 1 /L 2  is greater than or equal to ¼ and less than or equal to 3.