Double-layer vena cava filter and processing method thereof

Abstract

The double-layer vena cava filter comprises a recovery hook, an upper-layer filter screen, a lower-layer filter screen and a connecting rod, the upper-layer filter screen is composed of unit upper-layer supporting rods, the lower-layer filter screen is composed of unit lower-layer supporting rods, and the unit upper-layer supporting rods and the unit lower-layer supporting rods are arranged in a staggered mode; upper-layer supporting legs arranged in the axial direction of the connecting rods are arranged at the outer ends of the unit upper-layer supporting rods, the unit upper-layer supporting rods are in interference fit with the upper-layer supporting legs, lower-layer supporting legs arranged in the axial direction of the connecting rods are arranged at the outer ends of the unit lower-layer supporting rods, and the unit lower-layer supporting rods are in interference fit with the lower-layer supporting legs. Barbs are arranged on the unit upper-layer supporting rods and / or the unit lower-layer supporting rods at intervals in the circumferential direction, the inner ends of the barbs are fixedly connected with the unit upper-layer supporting rods and / or the unit lower-layer supporting rods, and the outer ends of the barbs are arranged to be in a needle tip shape capable of being inserted into the blood vessel wall; the thrombus filtering device has the advantages of simple structure, good thrombus filtering effect, realization of central positioning, no damage to the blood vessel wall during recovery and the like.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a double-layer vena cava filter and a processing method thereof. Background technique [0002] Venous thromboembolism includes deep vein thrombosis and pulmonary embolism, both of which can be considered as different manifestations of the same disease in different periods. Acute disease with high clinical morbidity and mortality. [0003] The vena cava filter is a vascular filtering structure placed in the vena cava to capture thrombus, which can prevent the thrombus from moving up to the heart and lungs and effectively prevent pulmonary embolism. [0004] At present, recyclable vena cava filters are widely used, and the filters of the existing recyclable filters are mostly designed with a single-layer filter, which has poor filtering effect and is prone to thrombus detachment. It is prone to tilt within the vessel and increases the difficulty of retrieval. [0005] Af...

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Problems solved by technology

[0006] The disadvantage of this structure is that although the double-layer structure is designed to filter more thrombus and increase the central positioning function, after the double-layer venous filter enters the blood vessel, the tails of the upper filter and the lower filter are connected to each other. The blood vessel wall is in contact with each other and is covered by the intimal hyperplasia of the blood vessel wall. When the double-layer venous filter is recycled, the tail of the upper filter and the tail of the lower filter need to be separated from the blood vessel wall, which will tear the intima and cause damage to the blood vessel wall. large area

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