Axially compressible and stretchable bare stent

An axially compressible and stretchable bare stent, used in an aorta, the bare stent comprising:

• a non-sparse mesh area, wherein the non-sparse mesh area is formed by overlapping and interleaving at least first wires and second wires, each of the first wires and each of the second wires having different diameters, wherein a diameter of each of the first wires ranges from 20 μm to 150 μm, and a diameter of each of the second wires ranges from 150 μm to 600 μm;
• and
• a first sparse mesh area and a second sparse mesh area, wherein each of the first sparse mesh area and the second sparse mesh area is formed only of the second wires, and each of the first sparse mesh area and the second sparse mesh area is configured to be arranged at branch arteries of a corresponding treatment site after the bare stent is released,
• wherein the bare stent is provided with at least two layers of woven meshes;
• wherein in a natural release state, except for the first sparse mesh area and the second sparse mesh area, the bare stent has a metal coverage of at least 60%;
• wherein the first wires comprise first thin wires and second thin wires, each of the first thin wires and each of the second thin wires having different diameters, wherein a diameter of each of the first thin wires ranges from 50 μm to 100 μm, and a diameter of each of the second thin wires ranges from 100 μm to 150 μm;
• wherein the bare stent is formed by weaving 96-202 wires, among which 4-30 wires are the second wires, and remaining wires are the first wires, wherein the first wires comprises 32-166 first thin wires and 32-166 second thin wires, provided that a sum of a number of the first thin wires and a number of the second thin wires is less than or equal to 198.