self-expanding stent

Abstract

The present invention aims to provide a self-expanding stent. When the self-expanding stent is expanded at the target site, the anchor part is in contact with the blood vessel wall or the wall of the digestive organ at the most suitable position, and it is difficult to get between the anchor part and the blood vessel wall or the wall of the digestive organ. A gap is created, and as a result, the self-expanding stent is less likely to deviate from the target site. In a self-expanding stent (1) in which a plurality of braided wires (10, 11) are braided with each other, a first anchor component (20) is installed on at least one tip (12) of one braided wire (10). The top (22) of the first anchor component (20) is fixed to the top (12) of at least one braided wire (10), and its rear end (24) is not fixed to at least one braided wire (10), which is a free end . Therefore, the rear end (24) of the first anchor member (20) is movable with the top end (22) as a fulcrum, and the first anchor member (20) can contact the blood vessel wall or digestive organ wall at the most suitable position.

Description

technical field [0001] The present invention relates to a self-expanding stent, which is used to support the lumen of blood vessels or digestive organs, so that the stenosis or obstruction formed in the blood vessels or digestive organs will not restenosis, or used to pack the embolic coil in the formed In aneurysms of arteries in the abdomen or brain, to prevent aneurysms from rupturing. Background technique [0002] A stent is a medical device used to treat stenosis, blockage, or aneurysm (hereinafter referred to as "target site") formed in blood vessels or digestive organs. Stents are broadly classified into balloon-expandable stents that are expanded using a balloon catheter, and self-expandable stents that expand naturally by themselves. Recently, self-expanding stents that are hardly deformed by external force are often used. [0003] The self-expanding stent is generally released from the tip of the catheter to the target site by pushing the guide wire toward the ti...

AI Technical Summary

Problems solved by technology

[0004] However, in the self-expanding stents of Patent Document 1 and Patent Document 2, since both the top end and the rear end of the anchor member are fixed on the braided wire constituting the self-expandable stent, the anchor member has no degree of freedom relative to the braided wire.

Therefore, when the self-expanding stent is expanded at the target site, it is difficult for the anchor member to contact the wall of the blood vessel or the wall of the digestive organ at the most suitable position. As a result, the anchoring effect of the anchor member on the wall of the blood vessel or the wall of the digestive organ is not good, Off-target problems with self-expanding stents

In particular, when the target site is at the bend, a gap is formed between the anchor member and the wall of the blood vessel or the wall of the digestive organ, and the anchoring effect of the anchor member on the wall of the blood vessel or the wall of the digestive organ is notable.

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