Intravascular multi-section thrombectomy stent and conveying device thereof

Abstract

The invention discloses an intravascular multi-section thrombectomy stent and a conveying device thereof, and belongs to the field of vascular intervention medical treatment. The conveying device comprises a conveying outer tube, a stent fixing tube, a head end telescopic tube, a head end guide cap and a thrombus extraction stent, wherein the stent fixing tube is arranged in the conveying outer tube in a sleeving manner, the near end of the head end telescopic tube is inserted into a tube opening in the far end of the stent fixing tube, and the hollow head end guide cap is fixed to the far end of the head end telescopic tube; and the thrombectomy stent is a multi-section thrombectomy stent made of metal with a shape memory effect, and the multi-section thrombectomy stent consists of at least three thin neck parts, umbrella-shaped filter screens, extension parts and extension rods, wherein the umbrella-shaped filter screens, the extension parts and the extension rods are sequentially connected between the adjacent thin neck parts from the far end to the near end. The thrombus extraction stent of the device adopts a fusiform net rack form, and the tops of a plurality of convex extension parts of the thrombus extraction stent can scrape and collect various obstructions such as thrombus attached to the wall in a blood vessel. The dense meshes at the tail of the stent at the far end can collect and prevent thrombus from escaping to the far end, and other branches are prevented from being blocked.

Description

technical field [0001] The invention relates to an intravascular multi-segment thrombectomy bracket and a delivery device thereof, belonging to the technical field of vascular interventional medicine. Background technique [0002] Abnormal vascular channels cause blood to flow abnormally in blood vessels. This hemodynamic abnormality can cause a series of adverse consequences such as tissue hypoxia, abnormal intravascular pressure, increased cardiac load, and even heart failure. Therefore, abnormal channels generally need to pass through Catheter interventional techniques restore or reestablish blood flow in blood vessels. Narrowing or blockage of blood vessels can have several undesirable consequences: blood flow is turbulent, slowing down can lead to blood clot formation, which restricts blood supply to downstream areas of the vasculature. When the blood clot is located in the neurovascular system, it may cause a stroke; when the blood clot is located in the pulmonary art...

AI Technical Summary

Problems solved by technology

It is generally safe and effective to capture the thrombus through the stent and remove it by suction (i.e. negative pressure) through the suction catheter. However, when the thrombus retrieval stent embedded in the thrombus passes through the suction opening of the suction catheter, the In the process of gradually narrowing through the suction opening of the catheter from the self-expanding large diameter state, the thrombus is easily squeezed by the mesh stent and cut and broken, and the broken thrombus is easy to escape to the distal end along the blood flow direction and block other vascular branches

Moreover, when the blood flow is flowing towards the distal end of the thrombus, the blocked thrombus and other obstructions may also break off during the transfer of the thrombus retrieval stent and flow to the distal end along the direction of blood flow, and accumulate in other parts, blocking other branch vessels

In addition, some of these cylindrical textured thrombectomy stent devices collapse when encountering vessel bends, thereby increasing the chance of escape or rupture of the captured thrombus

For some obstructions are usually attached to the vessel wall, it is difficult for traditional thrombus retrieval stents to capture and transfer the wall-attached thrombus

Images