Recyclable unidirectional valve covered stent

Abstract

The invention discloses a recyclable unidirectional valve covered stent which comprises a mesh stent (1) and a membrane (3) with a horizontal-strip shaped opening (2), wherein the mesh stent is formed by weaving a plurality of memory alloy wires; the key point is that the mesh stent (1) is integrally formed by at least two sections with different diameters, i.e. a section (4) with the big diameter (4) and a section (6) with the small diameter; the cross sections of the two sections are step-shaped; the membrane (3) is arranged in the section (6) with the small diameter; the edge of at least one end of the mesh stent (1) is provided with an end part device which can collect the mesh stent (1). The sent can realize the bi-directional imbedding or recovery, and is safe and reliable; the membrane has reasonable structure and strong anti-backflow capability, and is reliable and durable; and the covered stent can be used for lung diseases, bile ducts, blood artery, venous valves and preventing heterodromous circulating of human body lumens.

Description

Technical field: [0001] The invention relates to a medical device, in particular to a retrievable one-way valve-covered stent used for blocking heterogeneous flow in the lumen of a human body during interventional treatment. Background technique: [0002] Emphysema, pulmonary bullae, chronic obstructive pulmonary disease, and anisotropic circulation in human lumens are all common diseases. With the maturity of interventional treatment techniques, a device that can place a diaphragm in the lesion area of ​​the patient has been developed. The stent-graft uses a diaphragm to block the flow in different directions. However, the existing stent-graft is provided with a hook body. After being inserted into the lumen, the hook body pierces the wall of the lumen to position the stent, which has disadvantages that are difficult to overcome. , for example, the leptophytes will cause varying degrees of damage to the wall of the human lumen, which is likely to cause complications such as...

AI Technical Summary

Problems solved by technology

[0002] Emphysema, pulmonary bullae, chronic obstructive pulmonary disease, and anisotropic circulation in human lumens are all common diseases. With the maturity of interventional treatment techniques, a device that can place a diaphragm in the lesion area of ​​the patient has been developed. The stent-graft uses a diaphragm to block the flow in different directions. However, the existing stent-graft is provided with a hook body. After being inserted into the lumen, the hook body pierces the wall of the lumen to position the stent, which has disadvantages that are difficult to overcome. , for example, the leptophytes will cause varying degrees of damage to the wall of the human lumen, which is likely to cause complications such as perforation and long-term inflammation, and after the stent graft is placed in the human lumen, it will be deformed due to deformation due to pressure, and the diaphragm will fail. The anti-reflux ability of the diaphragm is poor. If the stent is damaged, the stent is offset or the diaphragm is damaged, the stent cannot be taken out directly from the human body, and surgery is required to remove it. Therefore, the existing covered stents are in urgent need of improvement

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