Postcaval filter

Abstract

The invention relates to a postcaval filter. The postcaval filter comprises a supporting piece and a filtering piece, and the supporting piece is made of a degradable first material and is of a net-pipe-shaped structure with the two ends large and the middle small. The filtering piece is made of a degradable second material and comprises a first filtering part, a condensation part and a second filtering part which are connected in sequence, the cross section of an inner cavity of the first filtering part is gradually reduced in the direction from the first opening end to the condensation part,and the cross section of an inner cavity of the second filtering part is gradually reduced in the direction from the second opening end to the condensation part. No matter which direction blood flowpasses through, the blood flow needs to pass through the first filtering part and the second filtering part, mechanical blocking on thrombus is effectively achieved, thrombus is finally gathered at the position of the condensation part, and the thrombus capture rate is high.

Description

technical field [0001] The invention relates to the technical field of medical prosthesis, in particular to an inferior vena cava filter. Background technique [0002] Pulmonary embolism (PE) is a series of manifestations mainly caused by emboli blocking the pulmonary artery or its branches, leading to pulmonary circulation dysfunction and respiratory dysfunction. Most of the emboli come from the shedding of deep venous thrombosis (DVT) of the lower extremities. For patients with DVT who are clinically contraindicated in anticoagulation or anticoagulant therapy cannot achieve the purpose of preventing pulmonary embolism, it is necessary to implant inferior vena cava filters (IVCF) in the vein to intercept and capture the thrombus falling off the deep vein of the lower extremity so as to avoid the risk of pulmonary embolism. The inferior vena cava filter plays an important role in the prevention of pulmonary embolism in patients with DVT. [0003] At present, the types of I...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the structure of the frame is complex, and the position of the mesh of the degradable polymer frame is prone to risks such as stress fracture during the degradation process, resulting in the collapse of the supporting parts or the overall displacement of the inferior vena cava filter.

[0008] In summary, because the IVC filter needs to be installed inside the blood vessel, and while filtering large thrombus, it is also necessary to ensure smooth blood flow, so the design of the IVC filter is more difficult

At the same time, the traditional degradable inferior vena cava filter has insufficient support in the blood vessel and is easy to shift

And part of the inferior vena cava filter has a great obstacle to blood flow, and the thrombus capture rate is low

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