Vena cava filter of multilayer filtration

Abstract

The invention discloses a vena cava filter of multilayer filtration. The vena cava filter comprises at least two filter parts arranged at intervals in the axial direction, and a connecting rod used for making the two filter parts connected is arranged between adjacent filter parts; each filter part extends from the center to the outer sides of far ends, is everted and curled in the reverse direction step by step, and supported on the inner wall of a blood vessel in a point mode respectively. Aiming at the defects that the releasing process is uncontrollable and the blood vessel wall is likely to be damaged due to the problems that, in the prior art, filters are released through a femoral vein, bounce is likely to occur and positioning is inaccurate, the vena cava filter of multilayer filtration which can be controllably released in dual directions is provided; not only can the vena cava filter of multilayer filtration be implanted and recycled through a femoral vein and a jugular vein, but the vena cava filter of multilayer filtration has better self-centrality and is easier to capture and recycle.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a filter, in particular to a multi-layer filtering vena cava filter. Background technique [0002] Pulmonary embolism (PE) is a common health problem and an important cause of death in all age groups. Most pulmonary embolisms are caused by deep vein thrombosis (DVT) in the lower extremities or in the pelvis, in which blood clots can migrate through the veins back to the heart and into the lungs, losing blood and oxygen to part of the lungs supply leading to pulmonary infarction. [0003] like figure 1 As shown, in the prior art, there is a vena cava filter with multi-layer filtration of a double-layer conical filter mesh structure. The disadvantage of this filter is that when the filter is released through the thigh, the release process is uncontrollable. After the filter is pushed out of the sheath, The filter screen bounces off quickly and bounces, which makes the posi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the defects that the double-layer filter in the prior art is released through the femoral vein and is prone to bounce and inaccurate positioning, resulting in uncontrollable release process and easy damage to the vessel wall. A two-way controllable release, which can be implanted and recovered through the femoral vein, and can be implanted and recovered through the jugular vein, and has better self-centering, and is more easily captured and recovered.

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