Vena cava filter with double-layer filter net

Abstract

The present application relates to a vena cava filter with a double-layer filter net. The vena cava filter comprises a recovery part, the filter net and a support rod, wherein the recovery part, the filter net and the support rod are formed by cutting integrally; the recovery part is provided with a recovery hook; the filter net comprises an upper-layer filter net and a lower-layer filter net; theupper-layer filter net and the lower-layer filter net are connected through a filter net connecting rod; the filter net is of a spider web type structure on a projection surface perpendicular to thecentral axis of the vena cava filter; the support rod consists of a plurality of first support rods and a plurality of second support rods; the plurality of first support rods extend from the tail endof the lower-layer filter net; the plurality of first support rods extend outwards and are turned over to the recovery part gradually to form an upper open filter cavity; the plurality of second support rods extend down from the near end of the recovery part to form a lower open filter cavity; and each second support rod is fixedly connected with the upper-layer filter net and the lower-layer filter net.

Description

technical field [0001] The invention relates to a recyclable vena cava filter product in the field of medical equipment, in particular to a vena cava filter with double-layer filter nets. Background technique [0002] Venous thromboembolism (VTE) includes deep vein thrombosis (DVT) and pulmonary embolism (PE), both of which can be considered as different manifestations of the same disease in different periods. life and health. At present, anticoagulation is the main clinical treatment for deep vein thrombosis, but even if a sufficient amount of anticoagulant is given, there is still a risk of fatal pulmonary embolism. Implantation of inferior vena cava filter is an effective means to prevent secondary fatal pulmonary embolism after deep vein thrombosis. [0003] The filters used clinically in the past are usually permanent filters, but while preventing pulmonary embolism, they increase the risk of long-term thrombotic complications after filter implantation, thus limiting ...

AI Technical Summary

Problems solved by technology

[0005] However, most of the filters in the prior art are designed with a single-layer filter, the filtering effect is not good, there will be small and medium thrombus penetration, and even the phenomenon of thrombus detachment; Potential risks that the barbs cannot enter the sheath, the filter is difficult to recover, and it is easy to cause secondary injury to the patient. In addition, the filter in the prior art also has defects such as poor self-neutrality, large contact area with the inner wall of the blood vessel, and cannot be controlled bidirectionally.

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