Recyclable vena cava filter

Abstract

The invention discloses a recyclable vena cava filter comprising a filtering part for filtering thrombus and a supporting part for fixing the filter. The filtering part includes a first filtering partbody and a second filtering part body that are arranged along the vein, wherein the first filtering part body and the second filtering part body have central symmetry structures respectively; and thefirst filtering part body and the second filtering part body are connected through a connecting part. The supporting part includes a first supporting part and a second supporting part; the first supporting part is arranged at the tail end of the first filtering part body; and the second supporting part is arranged at the middle section part of the second filtering part body. The recyclable vena cava filter has high geometric stability and a long recovery period and is capable of carrying out oriented recovering or releasing. The geometric stability of the filter is improved while the thrombusfiltering effect is improved and inclination and displacement of the filter are reduced. Since the filtering parts on the two sides employ an asymmetric design, the thrombus filtering effect is enhanced; and all filtering parts employ curling and arc-shaped fixing anchor designs, so that the damage of the instrument to the blood vessel wall is reduced.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a recoverable 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 effecti...

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 a recyclable structural 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 this kind of vena cava filter has a long recovery period, 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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