Recoverable vena cava filter

Abstract

The invention provides a recoverable vena cava filter. The recoverable vena cava filter comprises a recovery part and at least three structural rods sent out from the recovery part, wherein the at least three structural rods are bent and shaped to form at least two thrombus filter screens, two supporting discs and a tail end structure, one thrombus filter screen is arranged between the recovery part and one supporting disc, the other thrombus filter screen is arranged at the waist part between the two supporting discs, the tail end structure is arranged at one end, far away from the thrombus filter screens, of the other supporting disc, and the tail end structure comprises a plurality of tail ends which are free from one another; and the tail ends which are free from one another are inclined, bent and gathered towards the central axis of the vena cava filter. The recoverable vena cava filter can effectively prevent the problems of deflection, deviation, displacement and the like of the vena cava filter, the thrombus filtering effect is effectively improved, and the safe recovery time of the vena cava filter can be prolonged.

Description

technical field [0001] The invention relates to a vena cava filter, in particular to a recyclable vena cava filter. Background technique [0002] Pulmonary embolism (PE) has a high morbidity and mortality rate, which may lead to chronic pulmonary hypertension and seriously affect the quality of life of patients. Deep vein thrombosis (DVT) of the lower extremities is the main cause of pulmonary embolism, and 60% to 70% of DVTs will cause PE; meanwhile, 90% to 95% of pulmonary emboli originate from DVT. Due to the high morbidity, high mortality and high disability rate of PE and DVT, anticoagulation therapy is currently considered to be an effective method for the treatment of DVT and prevention of PE. For severe complications and failure of anticoagulation, vena cava filter (VCF) is an effective method to prevent PE. The application of vena cava filter can not only effectively prevent the occurrence of pulmonary embolism, but also it is safer and more effective for thrombol...

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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