Flexible iliac vein stent capable of being positioned accurately

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a flexible iliac vein stent capable of being positioned accurately. The stent comprises a stent front section and a stent rear section. The stent front section and the stent rear section are made of metal materials, and the stent front section is a laser engraving tapered mesh tube structure, the length of the stent front section is a=4 cm, the surface where a front opening is formed of the stent front section is a sloped surface, the angle of inclination is 20 degrees <=gamma <=30degrees, the stent rear section is a woven mesh tube structure, the length of the stent rear section is 4 cm <=b <=20 cm, the rear end of the stent front section overlaps with the front end of the stent rear section,the overlapping length size is c=1 cm, and overlapping portions of the stent front section and the stent rear section are welded together. The stent can not only be accurately positioned and placed inthe opening of a common iliac vein without influence on the blood flow of a contralateral iliac vein, but also have good flexibility to reduce the occurrence of thrombus, and a long-term unobstructedstate of the stent is maintained.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an accurate and flexible iliac vein stent. Background technique [0002] Both iliac vein compression syndrome (Cockett syndrome) and iliac vein post-thrombotic syndrome manifest as iliac vein occlusion or stenosis, which can cause venous return obstruction and venous hypertension, leading to venous valve insufficiency, varicose veins, long-term lower limb edema, and pigmentation Chronic ulcers of the lower extremities and long-term unhealed serious consequences, and secondary iliac-femoral vein thrombosis may occur, and even male and female infertility or male varicocele may occur. Restoring the patency of the iliac vein is the key to clinical treatment. Traditional open surgery has large trauma, poor curative effect, and venous thrombosis is prone to occur after operation, so it is rarely used clinically. However, endovascular surgery is currently the main tr...

AI Technical Summary

Problems solved by technology

Traditional open surgery has large trauma, poor curative effect, and venous thrombosis is prone to occur after operation, so it is rarely used clinically. However, endovascular surgery is currently the main treatment method to restore the patency of the iliac vein. Through interventional methods, balloon dilation is performed at the stenosis of the iliac vein After implanting bare metal stents, this method is simple to operate, less traumatic, and has a high success rate, but there are still some problems. Currently, there are two main types of iliac vein stents available clinically: one is laser-engraved metal stents, and the other is laser-engraved metal stents. Metal braided stents, the former can be accurately positioned and placed in the common iliac vein, but for long-segment iliac vein lesions, thrombosis in the stent is likely to occur after placing a long segment of laser-engraved stent, and it cannot cross the hip joint; It is necessary to enter the inferior vena cava more than 2cm to ensure complete coverage of common iliac vein lesions. In this way, the stent usually completely blocks the opening of the contralateral common iliac vein, which affects the contralateral venous return and can easily induce contralateral iliac vein thrombosis. It is difficult to support the cicatricial stenosis of the common iliac vein, and there is a problem that the stent cannot fully open the iliac vein

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