Self-expanding braided stent and its delivery device

Abstract

A stent conveying device comprising a self-expanding woven stent and a conveying component. The length of the stent prior to release is 1.82-2.22 times the length of the stent after release. An axial shortening ratio of the stent is 45-55%, and a stent weave angle is 90-140°. The conveying component includes an inner tube (1), a stent pushing tube (2), a stent binding tube (3), a handle housing (4), a driving device connector (5), a Luer connector (6), a stent binding tube connector (7), a stent pushing tube driving device (8), and a gearing device. The self-expanding woven stent is designed to prevent the stent from elongating upon release. During release of the stent, the stent pushing tube moves to the distal end, thereby compensating the amount of axial shortening after the stent is released and boosting vascular patency rates after stent implantation.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a self-expanding braided support and a delivery device thereof. Background technique [0002] Vascular diseases, which are called vascular diseases in traditional Chinese medicine, the incidence rate has increased significantly in recent years, such as arterial stenosis, arterial and venous thrombosis, and aneurysms. Peripheral arterial stenosis and occlusive lesions are common in atherosclerosis, diabetes, Takayasu, etc. The main manifestations are decreased skin temperature, muscle atrophy, no pulse or weak pulse, intermittent claudication, and necrosis of distal limbs in severe cases. Amputation is even required, which is life-threatening in severe cases; venous thrombosis disease can cause blood stasis and swelling in the affected limb, and there is a risk of fatal pulmonary embolism; Vascular disease has a high disability rate and a certain fatality rate, and medi...

AI Technical Summary

Problems solved by technology

However, the disadvantages of self-expanding stents include: when the stent is released, there are forward jumps and axial shortening, and it is difficult to accurately position and release; During the release process, it will move proximally as the release progresses, requiring the operator to manually adjust the position of the delivery system during the operation, resulting in the operator being unable to accurately control the positioning of the stent during the operation. The stent has distal and proximal ends. Difficult positioning and unsatisfactory release position; the flexibility and anti-bending performance of the stent cannot fully adapt to the complex stress caused by the long-term mechanical movement of the human body, and the stent is prone to stress fatigue after long-term implantation rupture, leading to symptoms of restenosis in blood vessels

Therefore, this type of stent has been unsatisfactory for the treatment of vascular diseases.

Images