Novel deformable non-axial-flow vene cava filter

Abstract

The invention relates to a novel deformable non-axial-flow vene cava filter, which comprises a fixing rod, a deforming arm, a tensile ring, a self-adaptive tensile ring and a fixing component; one end of the fixing end and one end of the deforming rod are connected together through the fixing component; the self-adaptive tensile ring is connected to the end points of the other ends of the fixing rod and the deforming arm, and the tensile ring is connected to the middle parts of the fixing rod and the deforming arm to form an eccentric non-axial-flow conical structure. The deformable filter disclosed by the invention is tightly closed to a blood vessel wall through the tension effect and is conductive to cover an inner film; by adopting the eccentric structural design, the dynamic interference on the axial blood flow is reduced, and the captured thrombus is guided to be close to the blood vessel wall at one side; and the thrombus is bonded and organized with the blood vessel wall through a specially designed 'structural bare zone', and even through the filter at the later period is opened to be a bracket structure, the bonded thrombus is very hard to drop off. Meanwhile, the thrombus tightly adhered with the blood vessel wall is beneficial to activating a fibrinolytic system, so that autologous absorption can be carried out to remove the thrombus.

Description

technical field [0001] The invention relates to a novel deformable non-axial flow vena cava filter, which belongs to the field of medical equipment. Background technique [0002] Pulmonary thrombo-embolism (PTE) is a syndrome of heart and lung dysfunction caused by peripheral venous emboli entering the pulmonary artery circulation. If the embolism area exceeds 50-80% of the pulmonary artery, sudden death will occur, accounting for the clinical cause of sudden death. 5%. 60% to 90% of emboli causing pulmonary embolism originate from deep vein thrombosis or pelvic vein thrombosis in the lower extremities. The use of mechanical filtration devices to physically intercept floating thrombus can prevent fatal pulmonary embolism, which has been clinically used for many years. The inferior vena cava is the venous vessel with the largest caliber and the highest flow rate in the body. It recycles blood from the tissues of the lower limbs, abdomen, and pelvis to return to the heart. T...

AI Technical Summary

Problems solved by technology

Increasing the capture rate is mainly to intercept the blood flow axis where the most tangible substances such as thrombus float most in the blood flow, that is, to intercept the axial flow. This is also the reason why the filtration efficiency is significantly reduced when the filter position is tilted during clinical operation; and Correspondingly, once the thrombus is successfully intercepted by the filter or the thrombus is locally formed on the filter, the captured or new thrombus remains in the axial flow position of the vessel, which will significantly interfere with the hemodynamic steady state and cause turbulent flow, resulting in increased local shear stress and damage to endothelial cells. And platelet activation increases, prone to thrombosis, eventually leading to vena cava occlusion

This phenomenon is a dilemma that cannot be solved by applying filters at present

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