A lotus petal-type double-layer point-supported retrievable vena cava filter and its manufacturing method

Abstract

A lotus petal-type double-layer point-supported retrievable vena cava filter and a manufacturing method thereof. The invention relates to a double-layer lotus petal type point-supported vena cava filter. The filter includes a recoverable column, a front filter screen, a rear filter screen and a fixed hook at the end of the screen. The recoverable column is located at the end of the filter, and the upper part is provided with a Recovery hook; the front filter and the rear filter are surrounded by a number of nickel-titanium alloy filter wires that diverge from the center of the recovery column to the surroundings, and are in the shape of circular arc petals to improve their support rigidity. The mesh of the filter is more uniform, and on the premise of ensuring sufficient blood flow area and smooth blood flow, the interception rate of thrombus is effectively increased; the fixed hooks are distributed at the end of the circular arc petals of the front and rear filter screens, and are in contact with the blood vessels during work. The point contact between them reduces the damage to the blood vessel when the filter is recovered. At the same time, the filter screen is divided into two parts, the front and the back, and the support point is also divided into two parts, which not only prevents the rotation of the filter, but also improves the point support of the filter in the blood vessel. Stability, avoiding the risk of overall displacement of the filter during installation and use to the greatest extent.

Description

technical field [0001] The invention relates to a vena cava filter and a manufacturing method thereof, belonging to the field of implanted medical devices. Background technique [0002] The vena cava filter is currently the main filter device to prevent pulmonary embolism caused by embolism in the superior and inferior vena cava system. Patients matter. At present, filters are roughly divided into three categories: permanent filters, temporary filters, and recyclable filters. [0003] Permanent filters are often not equipped with a recovery hook, and they are placed in the patient's body for a long time, which is likely to cause problems such as broken wires, perforation of the inferior vena cava and puncture of organs, recurrent PE, and obstruction of the inferior vena cava. Temporary filters are mainly used to prevent pulmonary embolism in the short term after surgery. During use, they need to be fixed with a tethered catheter. There is no special fixing barb, so the sta...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to create a new type of retrievable vena cava filter to solve the problem of the stability of the inferior vena cava filter in the venous vessel, the oblique displacement and the resulting perforation of the inferior vena cava, and to achieve the goal of ensuring the efficient interception of thrombus by the filter. At the same time, prolong the retention time of the recyclable filter in the body, reduce the degree of endothelialization, and facilitate placement and recovery

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