Stent graft with variable coverage of wavy rings

A stent graft, comprising:

• at least one region T disposed along an axial direction of the stent graft, the region T is partitioned by two planes p1 and p2;
• the region T comprises a plurality of wavy rings, each wavy ring is a closed cylindrical structure, and comprises a plurality of proximal vertices, a plurality of distal vertices, and supporting bodies connecting the adjacent proximal vertices and distal vertices;
• the region T with the plurality of wavy rings is divided into at least, in a circumferential direction, a region A partitioned by said two planes p1 and p2 and a region B partitioned by said two planes p1 and p2 connected with the region A from said plane p1 to said plane p2;
• and
• each of the region A and region B comprises the wavy rings in the corresponding region of the region T;
• wherein a ratio of an area of the region A to an area of the region T ranges from 1/4 to 2/3;
• a ratio of a coverage rate of the wavy rings in the region A to a coverage rate of the wavy rings in the region B ranges from 1/5 to 9/10;
• and a ratio of a 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;
• wherein the any circular region with a diameter of 20 mm within the region A is a two-dimensional circular region randomly defined in the region A, and the two-dimensional circular region has a diameter of 20 mm and comprises the wavy rings in the corresponding region of the region A;
• and wherein the coverage rate of the wavy rings in each region is calculated in a way that a surface area of the wavy rings projected onto an inner wall of a tube cavity of the stent graft in the each region is divided by a surface area of the corresponding inner wall of the tube cavity of the stent graft in the each region and multiplied by 100;
• wherein a wavy ring in the region T comprises a first wavy segment located in the region A, where the first wavy segment includes a plurality of first proximal vertices, a plurality of first distal vertices, and first supporting bodies connecting adjacent first proximal vertices and first distal vertices;
• and
• wherein the wavy ring in the region T further comprises a second wavy segment located in the region B, a wave included angle of the first wavy segment is greater than a wave included angle of the second wavy segment, and a wave height of the first wavy segment is the same as a wave height of the second wavy segment.