Vein filter

Abstract

The invention discloses a vein filter, which comprises a tapered first filter net, a tapered second filter net and a connection segment, wherein one end of the first filter net is gathered at one point and the other end expands to form a plurality of first support end parts; one end of the second filter net is gathered at one point and the other end expands to form a plurality of second support end parts; the connection segment comprises a plurality of first connecting rods and a plurality of second connecting rods; two ends of each first connecting rod are connected with the corresponding first support end part and the second filter net separately; and two ends of each second connecting rod are connected with the corresponding second support end parts and the first filter net separately. The vein filter is good in structure stability, small in contact surface with a blood vessel wall, high in thrombosis capture ability and easy to recover.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a venous filter. Background technique [0002] Deep venous thrombosis (DVT) of lower extremities is a common clinical disease and the main cause of pulmonary embolism (PE). Pulmonary embolism has a high mortality and disability rate. The placement of an inferior vena cava filter (IVCF) can effectively prevent pulmonary embolism. The basic principle is to capture large fatal thrombus through the filter placed in the vena cava and prevent them from entering the pulmonary circulation. The use of venous filters is now more and more widespread. [0003] There are mainly the following problems in the clinical use of the existing venous filter: 1. Inclination. After the filter is inserted into the blood vessel, due to the poor stability of the support form, the filter is inclined toward the blood vessel side, and the recovered part is close to the blood vessel wall. This ...

AI Technical Summary

Problems solved by technology

[0003] There are mainly the following problems in the clinical use of existing venous filters: 1. Tilting. After the filter is placed in the blood vessel, the support form is not stable enough, causing the filter to tilt toward the side of the blood vessel, and the recovered part is close to the blood vessel wall.

This makes it difficult for the filter to be recaptured, and affects the filtration performance, such as the conical filter in the prior art, which is prone to "one-sided" situation

2. Internalization. After the filter is placed in the blood vessel, its support will be oppressed by its own elasticity, and gradually embedded in the vascular endothelium, causing the filter to be embedded in the blood vessel and difficult to recover

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