Vena filter

Abstract

The invention relates to a vena filter, which comprises a recovery element, a connection element and filter wires, wherein the end parts of a plurality of filter wires are fixed in the connection element; the other side of the connection element is connected with the recovery element; the connection element comprises a filter wire fixing element; the end parts of the filter wires are fixedly connected with the filter wire fixing element; and the filter wire fixing element is separably connected with the recovery element. The vena filter can intercept thrombus through the filter wires to achieve the functions of intercepting the thrombus and preventing pulmonary embolism, can inhibit apposition growth of local endothelial cells in contact with the filter wires, and reduces the incidence rate of a series of complications, such as difficulty in taking out the vena filter and a blood vessel injury or tear caused by taking delay; and by removing the recovery element, after polymer absorbable threads at the head ends of the filter wires are degraded, an umbrella-shaped filter screen automatically expands to become a vena cava stent, so that the influences of the filter wires on vena hemodynamics are reduced to the maximum extent to reduce the risk of DVT caused by a permanent intracavitary implant.

Description

technical field [0001] The invention relates to the technical field of design of an implantable intravascular filter in a medical device, in particular to a venous filter. Background technique [0002] Deep venous thrombosis (Deep Venous Thrombosis, DVT) refers to the process in which blood coagulates or certain formed components in blood coagulate to form solid masses in deep veins, which is common in peripheral veins. Pulmonary thromboembolism (Pulmonary Thromboembolism, PE) is a syndrome in which emboli from peripheral veins enter the pulmonary circulation along with the blood flow, blocking the blood supply to the lungs and causing heart and lung dysfunction. DVT and PE are collectively called Venous Thromboembolism (VTE). The incidence of VTE in the United States is about 300,000 to 600,000 cases per year. PE can cause 100,000 to 200,000 deaths in the United States every year. It is a major public health problem. question. In clinical practice, the incidence of sudden...

AI Technical Summary

Problems solved by technology

Studies have shown that the adhesion between IVCF and the vessel wall mostly occurs 9-12 weeks after implantation. At present, the time window for the removal of most retrievable IVCFs is usually within 14 days. Adhesion between hyperplasia and filter makes it impossible to remove, and it is forced to become a permanent IVCF. As a permanent implant, it remains in the body for a long time, and the filter may have complications such as tilting, displacement, embolism, rupture, and puncture of blood vessels. Therefore, it is often used as a potential hidden danger. Need regular follow-up observation

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