A kind of braided vena cava filter and braiding method

Abstract

The invention provides a woven type venae cava filter. The woven type venae cava filter is characterized by comprising a filter part, a fixing part and connecting parts, wherein the filter part, the fixing part and the connecting part are woven together and distributed in sequence from a heart near end to a heart far end; the filter part comprises N1 Y-type woven structures distributed in the circumferential direction; the fixing part comprises N1 ridges distributed in the circumferential direction; the connecting parts are of conical woven structures which are formed by extending directly the N1 ridges of the fixing part and ligating by second steel bushings or conical woven structures which are formed by extending the N1 ridges of the fixing part, then weaving, and then ligating by the second steel bushings. Another technical scheme of the invention provides a weaving method of the woven type venae cava filter. The venae cava filter, provided by the invention, can intercept larger size internal clots in the pulmonary embolism dangerous period, prevents venae pulmonales embolism, keeps smooth for a long term by shear force, can be taken out by an interventional operation after passing the pulmonary embolism dangerous period, and also can remain in a patient's body for a long term.

Description

technical field [0001] The invention relates to a vena cava filter. Background technique [0002] Pulmonary embolism (Pulmonary embolism, PE) is an acute disease with high clinical morbidity and mortality. Its incidence rate ranks third among cardiovascular diseases, second only to hypertension and coronary heart disease, and its mortality rate is 25-30%. According to incomplete statistics, there are currently 355,000 patients with pulmonary embolism in China. [0003] Pulmonary embolism is a series of clinical pathophysiological changes mainly caused by pulmonary circulation dysfunction caused by peripheral deep venous thrombosis or thrombus in the right heart chamber falling off into the pulmonary circulation, blocking the pulmonary artery or its branches. Research results show that 75-90% of the emboli that cause pulmonary embolism originate from the thrombus shed from the pelvic veins or deep veins of the lower extremities. The dislodged thrombus moves up the vena cava...

AI Technical Summary

Problems solved by technology

Although this design has played a good role in fixing, however, because the spindle-shaped filter is mostly made of nickel-titanium alloy tube laser engraving and then shaped at high temperature, there are wire breakages that lead to the collapse of the filter structure and damage to the inner wall of the vena cava, and blood circulation due to vascular embolism. Poor risk and other risks have been reported many times in the literature

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