Double-layer venous filter

Abstract

The invention belongs to the field of the human planting instrument of the biological medical paderial and concretely relates to a device used in the blood vessel and more particularly is the device for filtering and catching the thrombus or other block-shaped objects in the vena cava. The device includes an upper layer of sieve and a lower layer of sieve which are linked by a connecting rod which is arranged at the centers of the sieves and all consist of a plurality of unidirectional and parallel filtering silks which are introduced from the centers of the sieves, and the filtering silks are shaped like chrysanthemum petals which are spread from the centers of the sieves to the edges. The filtering silks of the upper layer of sieve are distributed more closely than the filtering silks of the lower layer of sieve. The invention arranges two layers of sieves, so the lower layer of sieve, which is provided thin filtering silks, is used to filter the bigger thrombus; the upper layer is provided with a net-shaped sieve with smaller consistency, or the filtering silks of the upper layer are distributed denser to filter the smaller thrombus. In addition, both of the two layers can keepcertain area as a blood stream passage to ensure the blood stream flows freely.

Description

technical field [0001] The invention belongs to the field of human body implantation equipment in biomedical materials, and in particular relates to a device for filtering and capturing thrombus or other lumps in blood vessels, especially vena cava. Background technique [0002] When thrombus or other vascular wall exfoliation exists in the venous blood flow of the human body, it can enter the pulmonary artery through the heart, causing pulmonary artery blockage, resulting in death. The filter can capture these thrombi and keep them in the vena cava, and then perform thrombolysis or thrombus extraction, thereby preventing the above-mentioned hazards from occurring. However, most of the early filters used a single-layer structure with a loose design, which can only filter large thrombus, and smaller thrombus can pass through. If the filter is made denser, it can filter smaller thrombus, but it may also be due to Accumulation of blood clots blocks the veins. Contents of the...

AI Technical Summary

Problems solved by technology

However, most of the early filters used a single-layer structure with a loose design, which can only filter large thrombus, and smaller thrombus can pass through. If the filter is made denser, it can filter smaller thrombus, but it may also be due to The accumulation of thrombus blocks the veins

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