Thrombus filter

Abstract

The invention discloses a thrombus filter which comprises a handle, a filter umbrella for capturing thrombi, a push catheter, and a folding device for shrinking and folding the filter umbrella, wherein the filter umbrella adopts a meshy elastically-recoverable funnel-shaped structure; a neck part of the filter umbrella is fixedly connected with the push catheter; an inner cavity is axially formed in the push catheter; a cavity enclosed by the filter umbrella is communicated with the inner cavity of the push catheter; the folding device comprises a take-up unit and a drawing mechanism for drawing the take-up action; the take-up unit is connected with an opening part of the filter umbrella and draws the opening part to be folded, so that the filter umbrella becomes a closed space; the drawing mechanism penetrates the inner cavity of the push catheter, extends towards the opening part of the filter umbrella and is connected with the take-up unit; the push catheter and the drawing mechanism are connected with the handle; the actions of the push catheter and the drawing mechanism are controlled by the handle. The thrombus filter can effectively block exfoliated plaques or emboli, and is simple in structure, small in push resistance and smooth in operation.

Description

technical field [0001] The invention belongs to the technical field of medical devices and relates to a filter, in particular to a thrombus filter used for filtering plaque or thrombus shed during surgery. Background technique [0002] With the wide application of endovascular interventional therapy in the world, its complications are becoming more and more obvious. For example, during balloon dilatation, arterial endarterectomy, vascular atherectomy or stent implantation, blood clots or calcified plaques are broken and detached, and thrombus is generated, which enters the distal end along the direction of blood flow Blood vessels that block the blood supply to vital organs, such as the brain, heart, or other vital organs. This embolism may lead to cerebral infarction, myocardial infarction, pulmonary embolism, etc., and may lead to death in severe cases. Taking interventional aortic valve replacement surgery as an example, due to severe stenosis and calcification of the a...

AI Technical Summary

Problems solved by technology

In this scheme, the thrombus interception net is deployed in the aorta, which can intercept the fallen plaque or emboli and protect the downstream branch vessels. The following disadvantages: First, in this scheme, the anti-overflow umbrella is in a closed state in a natural state, and the elasticity of the thrombus interception net is required to expand it in the blood vessel. After catching plaque or emboli, the anti-overflow umbrella relies on its own resilience to recover Closing the opening of the umbrella cover, the closing force is too small, and there is still a risk of plaque or emboli leaking during the process of recovering the thrombus. If the leaked thrombus blocks the vital organs of the patient, it will bring serious consequences; the second , in the narrow blood vessel lumen, because the anti-overflow umbrella is a metal mesh structure, it has a large degree of freedom in the axial direction. During the process of extending and withdrawing the thrombus interception net in the anti-overflow umbrella, there is a problem of anti-overflow Unexpected deformation of the umbrella caused the two to get stuck, making it difficult to retract the overflow-proof umbrella, and it would have to be transferred to surgery for resolution; The wall-attachment of the curved blood vessel is not good. At the same time, the anti-overflow umbrella and the thrombus interception net need a push rod respectively, so the rigidity of the whole device is relatively high, and the relative movement of the two during use is difficult to operate.

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