| 主权项 |
1. A stent, comprising:
a hoselike body braided with a specified length from a plurality of thin wires of superelastic metal, of which, alternately, one-half are wound in a shape of helices in one direction around a cylinder, and the other half are wound in a shape of helices in the other direction, with the thin wires in the one direction and the thin wires in the other direction obliquely intersecting like a plain weave, wherein: a longitudinally intermediate portion of the hoselike body is formed into a thin wire densely braided hose portion in which mutually neighboring superelastic metal thin wires are in contact with each other or close to each other with a minute interspace, and which has a length required for closure of an opening of blood vessel dilation, wherein both side portions thereof are formed into thin wire coarsely braided hose portions in which mutually neighboring superelastic metal thin wires are provided with diamond-shaped reticulated gaps allowing passage of blood flow with change in size of the reticulated gaps along a longitudinal direction of the hoselike body, while being constant in size thereof along a circumferential direction of the hoselike body such that the size of the reticulated gap of the thin wire coarsely braided hose portions along the circumferential direction of the hoselike body is equal to the size of the reticulated gap of the thin wire densely braided hose portions along the circumferential direction of the hoselike body, by changing intervals in a braiding direction of the plurality of thin wires being same in number as those of the thin wire densely braided hose portion, and wherein the hoselike body is capable of causing the individual superelastic metal thin wires to extend and finely gather when pulled in a longitudinal direction and allowing resilient restoration to the original hoselike body when released from pulling. |
