Vena cava filter

Abstract

The invention discloses a vena cava filter which is placed at the position of an inferior vena cava between kidney venas and iliac venas, and is formed by integrally cutting a nickel-titanium alloy pipe with laser. The filter comprises connecting rods, a top layer filter screen, a middle layer filter screen and a bottom layer filter screen, wherein the top layer filter screen, the middle layer filter screen and the bottom layer filter screen are jointly formed in a cage-shaped structure, the middle layer filter screen is positioned between the top layer filter screen and the bottom layer filter screen, and is formed by inwards bending a plurality of branches which are cut; the top layer filter screen and the middle layer filter screen can capture and intercept larger thrombosis, and the bottom layer filter screen can capture and intercept smaller thrombosis; the surfaces of the filter screens of the three layers are wrapped with PTFE (poly tetra fluoro ethylene) films; the connecting rods are in contact with vascular walls, are connected with the cage-shaped structure, can be divided into more than two branches, are formed by expanding, and are wrapped with the PTFE films. The vena cava filter provided by the invention has the advantages that the effect of filtering the thrombosis is excellent, the vena cava filter can be repeatedly and firmly positioned, the implantation time can be prolonged, the vena cava filter can be recovered, and the endothelialization effect can be delayed.

Description

technical field [0001] The invention relates to a vena cava filter with good thrombus filtering effect, repeatable and firm positioning, prolonging the implantation time, recyclable and delaying the effect of endothelialization. Background technique [0002] Currently, the incidence of deep venous thrombosis (deep venous thrombosis, DVT) and pulmonary thromboembolism (pulmonary thromboembolism, PE) is increasing day by day. As the most serious complication of DVT, PE has very high morbidity and mortality. According to epidemiological surveys in recent years, the annual incidence of PE in the United States alone is 750,000 to 900,000, and the annual death toll is 120,000 to 150,000. Pulmonary thromboembolism not only has a very high morbidity and mortality rate, but also has a sudden onset and rapid progression. Generally, patients with pulmonary thromboembolism die within the first hour of onset. Pulmonary thromboembolism also leads to chronic pulmonary hypertension, which ...

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Problems solved by technology

In clinical use, the surface of the material cannot achieve rapid end

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