Open vena cava filter

Abstract

The invention discloses an open vena cava filter which comprises a filtration part for thrombus filtration and a support part for filter fixing, wherein the filtration part comprises a first filtration part and a second filtration part that are arranged along a vein; the first filtration part and the second filtration part are in centrosymmetric structures; the first filtration part is connected with the second filtration part through a connecting part; the support part comprises a first support part and a second support part; the first support part is arranged on the first filtration part; and the second support part is arranged on the second filtration part. The open vena cava filter has good geometric stability and a long recycling cycle and can also be recycled or released directionally. The geometric stability of the filter is improved while a thrombus filtration effect is improved; inclination and displacement of the filter are reduced; the filtration parts on two sides adopt anunsymmetric design; the thrombus filtration effect is improved; filtration pieces adopt curly and arc mooring anchor designs; and injuries of vessel walls due to the filter are reduced.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an open vena cava filter. Background technique [0002] Embolism is a pathological and clinical state caused by deep vein thrombosis in the lower extremities or pelvis entering the pulmonary artery and its branches, blocking blood supply to tissues. With the improvement of living standards and the increase of accidents, the incidence of pulmonary embolism is increasing year by year. The annual incidence of deep vein thrombosis of lower extremities in the general population of Western countries reported in the literature is between 0.05% and 0.1%. In my country, there are about 30 million patients with deep vein thrombosis of lower extremities and its sequelae. Due to the potential risk of fatal pulmonary embolism caused by thrombus falling off, it has become a difficult problem in clinical treatment. The application of inferior vena cava filter can not only effective...

AI Technical Summary

Problems solved by technology

[0005] 1. There is a cage-shaped closed structure filter, such as the vena cava filter described in the Chinese patent whose patent number is CN201420865062.4 and the patent name is a vena cava filter assembly that is easy to take out. Good stability, but short payback period;

[0006] 2. There is an open structure filter, such as the vena cava filter described in the Chinese patent whose patent number is CN201310442071.2 and the patent name is vena cava filter. Although the recovery cycle of this kind of vena cava filter is long, its geometric stability is poor. It is easy to tilt or shift, resulting in reduced thrombus capture efficiency, and even thrombus filtration failure;

[0007] 3. There is a filter with a conical structure, which is implanted in the vena cava like a funnel to filter thrombus, and the opening of the funnel can only face the blood flow to effectively intercept the thrombus, so this filter only It can be recovered or released in one direction, and has poor adaptability to patients with special lesions, which makes it difficult for doctors to operate clinically. When the recovery device cannot capture, the filter recovery is often prone to failure, or it is removed by surgery;

[0008] 4. The existing vena cava filter anchor plays a role in fixing, but at the same time, it causes damage to the vessel wall, which is likely to cause other complications

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