A retrievable hepatic vein stent

Abstract

The invention discloses a recoverable hepatic vein support, which belongs to the technical field of intervention medical equipment. The recoverable hepatic vein support comprises an endovascular stent, a connecting rod, an extension rod and a delivery and recycling sheathing canal which are sequentially connected, wherein the endovascular stent is formed by metal wires and is a self-expanding support, the length of the endovascular stent is 50-70mm, the number of the metal wires is 6, the metal wires are obliquely arranged, two ends of the metal wires are gathered into a whole, the diameter of the recovering end is greater than that of the releasing end, the endovascular stent is integrally of a bipyramid structure, the recovering end is welded with a docking pipe, the other end of the docking pipe is connected with the connecting rod, the other end of the connecting rod is engraved with threads, and one end, corresponding to the connecting rod, of the extension rod is also engraved with threads which are matched with the threads of the connecting rod. While supporting force of the endovascular stent is ensured, the endovascular stent can be recovered in time, so that the condition that since the endovascular stent is placed in the blood vessel for a long time, thrombus is formed, and restenosis occurs due to the fact that blood vessel endothelium hyperplasia is caused can be avoided, and the treatment effect is ensured.

Description

technical field [0001] The invention relates to a stent, in particular to a recoverable hepatic vein stent, which belongs to the technical field of interventional medical equipment. Background technique [0002] Intravascular stent is a metal support placed in human blood vessels. It has the function of opening narrowed blood vessels and ensuring smooth local blood flow. It has been widely used clinically (such as coronary artery stents, carotid stents, iliac femoral artery stent, inferior vena cava stent, hepatic vein stent, iliac vein stent, etc.); once the intravascular stent is placed inside the blood vessel, it cannot be removed, but because the intravascular stent is a foreign body in the human body, it is easy to form thrombus and cause vascular endothelial hyperplasia for a long time However, restenosis occurs, and once restenosis occurs, it is difficult to deal with. [0003] The structure and shape of the hepatic vein are similar to those of dendrites, which gradu...

AI Technical Summary

Problems solved by technology

[0002] Intravascular stent is a metal support placed in human blood vessels. It has the function of opening narrowed blood vessels and ensuring smooth local blood flow. It has been widely used clinically (such as coronary artery stents, carotid stents, iliac femoral artery stent, inferior vena cava stent, hepatic vein stent, iliac vein stent, etc.); once the intravascular stent is placed inside the blood vessel, it cannot be removed, but because the intravascular stent is a foreign body in the human body, it is easy to form thrombus and cause vascular endothelial hyperplasia for a long time And restenosis occurs, once restenosis occurs, it is difficult to treat

[0003] The structure and shape of the hepatic vein are similar to those of dendrites, which gradually converge into a trunk from thin to thick, and the diameter of the proximal end of the trunk is larger than that of the distal end, which is conical and cylindrical. When the diameter of the stent meets the needs of the proximal end, the diameter of the distal end of the stent is significantly larger than the diameter of the hepatic vein, which will cause excessive expansion of the distal end of the stent and stimulate vascular endothelial hyperplasia, resulting in stenosis

[0004] Usually, there are two types of solutions to hepatic vein recanalization. One is to use balloon dilation for treatment. However, since the balloon dilation can only maintain local extrusion for a few minutes, the dilated hepatic vein will be damaged after the balloon is withdrawn. Elastic retraction occurs and satisfactory expansion cannot be achieved; another solution is to use a degradable stent, but its material is aluminum-magnesium alloy, and the supporting force is small, so the therapeutic effect cannot be guaranteed

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