Damage-free recyclable vena cava filter

Abstract

The invention discloses a damage-free recyclable vena cava filter, which comprises a cage bracket woven by nickel-titanium memory alloy wires. Two ends of the elastic alloy wires are fixed in two vertical end caps with recycling hooks; the middle section part of each alloy wire is in a straight line shape; and two drug balloons made of medical polymer materials are uniformly and symmetrically embedded on the upper part of each alloy wire. The macromolecule material surfaces of the symmetrically-distributed drug balloons are used for realizing accurate positioning, and tilting does not happen easily in the case of release; the structure is simple and stable, the end caps, the alloy wires and the balloons are symmetrically distributed, the upper part and the lower part of the filter form a two-layer basket, and thrombus can be effectively filtered; the arc surface of the balloon can prevent the inner wall of a blood vessel from being damaged by barbed spines of a conventional filter, andthe drug in the balloon can prevent vascular intimal hyperplasia and climbing and covering, and long-time placement can be realized; and as two vertical recycling hooks are arranged, the damage-freerecyclable vena cava filter can still be taken out from a femoral vein or a jugular vein after placement, the operation is simple and convenient, and two-way recycling can be realized easily.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a non-damaging retrievable vena cava filter. Background technique [0002] Complications of acute venous thromboembolism (VTE), including deep venous thrombosis (DVT), pulmonary embolism (PE), and post-thrombotic syndrome, are not only important in that they result in hospitalization A common preventable cause of death and a predisposing factor for many underlying chronic diseases. Studies have shown that most of the emboli that cause PE originate from DVT. [0003] Inferior Vena Cava Filters (IVCF) have been widely used clinically and are an effective measure to prevent PE. The fatal thrombus captured by IVCF can effectively avoid or reduce the occurrence of severe complications such as PE. [0004] At present, filters can be divided into three categories: permanent filters, recyclable filters, and temporary filters. [0005] Retrievable filters are retrieved from the human fe...

AI Technical Summary

Problems solved by technology

However, in order to achieve accurate positioning, the current vena cava filter mostly uses a barbed structure, which is easy to damage blood vessels, and even perforate the inferior vena cava

Some vena cava filters are in too much contact with the inner wall of the blood vessel. Intimal hyperplasia and migration of smooth muscle will cause the filter of the vena cava to be covered and bonded by the inner wall of the blood vessel. If it takes more than 2 weeks, it will be difficult to remove it. If it is forcibly recovered, it may cause damage to the blood vessel wall.

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