A retrievable vena cava filter

Abstract

The present invention provides a retrievable vena cava filter, comprising: a retrieving part and at least 3 structural rods issued from the reclaiming part, and the at least 3 structural rods are bent and shaped to form at least two thrombus filter screens, two A support plate and a terminal configuration, wherein, a thrombus filter is arranged between the recovery part and a support disk, and another thrombus filter is arranged at the waist between the two support disks, and the end configuration is arranged at The other support plate is away from one end of the thrombus filter, and the end configuration includes a plurality of mutually free ends, and the plurality of mutually free ends are obliquely bent and gathered toward the central axis of the vena cava filter. The present invention can effectively prevent the problems of the vena cava filter from skewing, shifting and shifting, effectively improve the filtering effect of thrombus, and prolong its safe recovery time.

Description

Technical field [0001] The present invention relates to a cavity venom filter, and more particularly to a recyclable cavity vena. Background technique [0002] Pulmonary Embolism, PE is high and the fatal rate can lead to high pressure of chronic pulmonary artery, seriously affecting the quality of life of patients. Deep Vein Thrombosis, DVT is the most important reason for pulmonary artery embolism, and 60% to 70% of DVT will occur in DVT; simultaneous 90% to 95% pulmonary intensive from DVT. Due to the high morbidity, high mortality, high-loss rate, high-loss rate and DVT have highly correlated, and current anticoagulant therapy is considered an effective method for treating DVT and preventing PE; however, there is antagonogenicity and anticoagulant therapy. Severe complications and anticoagulant, Vena Cava Filter, VCF) are effective to prevent PE. The application of the cavity venous filter can not only effectively prevent the occurrence of pulmonary embolism, but it is more s...

AI Technical Summary

Problems solved by technology

[0004]Temporary VCF is mainly divided into open and closed frame structure filters, among which, the single-umbrella open filter includes multiple structural rods, one end of which is The open end and the other end come together to form a closed end, forming a filter net. Multiple structural rods radiate from the closed end and contact the blood vessels, which play a role in fixing the filter. Since the ends of the structural rods are free, even if the structural rods are internalized by angiogenesis Wrapped in a membrane, the construction rod can be easily separated from the blood vessel wall by external force at any time according to the need, without damage to the intima of the blood vessel, so the open filter has a long recovery period, but because one end of the single-umbrella open filter is an open structure, The structural rod at the open end has weak support for blood vessels. Under the influence of blood flow, breathing and external force, the filter is easy to tilt and shift, and the end of the open rod is easy to damage or puncture the blood vessel wall, and even cause complications such as blood vessel wall perforation. , followed by a single-layer filter with low filtration efficiency

The closed frame filter includes a plurality of structural rods, and the two ends of the multiple structural rods are gathered together to form a closed end. The structural rods are in contact with the blood vessels to play the role of fixing the filter. The two closed end faces are filter screens, and the closed frame The stability of the filter is better, it is not easy to tilt and shift, and the filtering effect is good, but because the two ends of the filter are closed, if the structural rod of the filter is wrapped by the neointima, the structural rod cannot be pulled out from the blood vessel wall and can only be forcibly removed. The filter can only be removed by tearing the neointima covering the structural rod. If the neointimal hyperplasia is thick and cannot be torn, it will make it difficult to remove the implanted filter, and the recovery time window is short

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