a thrombus filter

Abstract

The invention discloses a thrombus filter, which comprises a filter tray, an elastic supporting frame and a central rod, wherein the filter tray is of a contractible structure; the filter tray is connected to the tail end of the central rod; the elastic supporting frame is connected to the upper end of the central rod; and a recovery end is arranged at the top end of the central rod. The thrombus filter disclosed by the invention is stably fixed in inferior vena cava, and is simple in recovery operation, strong in self-centered capacity, not easy for inclination and good in thrombus filtering effect.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a thrombus filter. Background technique [0002] Pulmonary embolism (referred to as Pulmonary Embolism, PE) is a series of clinical pathophysiological changes mainly caused by pulmonary circulation dysfunction caused by peripheral deep vein thrombosis or thrombus in the right heart cavity falling off into the pulmonary circulation, blocking the pulmonary artery or its branches, Severe cases can cause sudden death. Studies have shown that the emboli that cause PE mainly come from the deep veins of limbs or pelvic veins, accounting for 60%-90% of the sources of emboli. Therefore, a thrombus filter can be placed below the level of the opening of the renal vein, that is, the inferior vena cava, to intercept free emboli in the blood, which can effectively prevent the occurrence of pulmonary embolism PE. At present, this technology is being continuously applied in clinical treatment...

AI Technical Summary

Problems solved by technology

[0004] Current thrombus filters have numerous limitations; such as figure 1 , figure 2 As shown, the limitation of the conical thrombus filter is that when the device is implanted in the inferior vena cava, due to the poor self-centering ability of the conical device, the device is easy to tilt after being implanted in the inferior vena cava. After the device is tilted, the recovery head is tight. Adhere to the vessel wall; during the recovery process, the recovery device cannot successfully capture the recovery head, which will increase the operation time of the device recovery operation, and even lead to the failure of the device recovery operation; and the single-layer conical shape of the device determines this type of device The filtering ability of the thrombus is poor; the fixation effect of the device is poor, and the device is easy to shift after implantation; if image 3 , Figure 4 As shown, the limitation of the lantern-shaped thrombus filter is that in order to strengthen the fixation effect on the inferior vena cava, the device increases the area of ​​the central rod that contacts the vessel wall. During the process, it is easy to tear the endothelium and damage the vessel wall, and even cause the device to be unrecoverable

[0005] In short, the existing thrombus filter is unstable in the inferior vena cava, and the recyclable operation is troublesome, with poor self-centering ability, easy to tilt, and poor thrombus filtration effect.

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