Recyclable interventional stent for constricting blood vessels

Abstract

The invention discloses a recyclable interventional stent for constricting blood vessels, which is made of memory-alloy meshes; the stent is waist drum shape; the expanding part at the upper end of the stent has no tectorial membrane or has tectorial membrane; the narrow part in the middle of the stent and the expanding part at the lower part of the stent are covered with pericardium in anti-calcification treatment; and metallic line rings are threaded at the lowermost edge of the stent. The recyclable interventional stent for constricting blood vessels is arranged on the pulmonary artery trunk through an interventional method; the pressure at the remote end of the pulmonary artery is reduced through the narrow part in the stent; when being necessary, the stent is recycled through the interventional method. The stent is used for replacing normal pulmonary banding so as to improve curative effect and reduce related complication rate and death rate. Adhesion is not formed around the heart and great vessels and pulmonary stenosis is not formed, so the difficult of the radical operation is not increased. The stent is suitable for other situations for reducing artery blood flow and pressure.

Description

Technical field [0001] The invention relates to a recoverable vascular narrowing interventional stent, which can cause stenosis in the blood vessel cavity and reduce the blood flow and pressure at the distal end of the stenosis, so as to reduce the flow and pressure at the distal end of the blood vessel. Background technique [0002] Pulmonary artery banding (Puomary Banding) is a commonly used palliative surgical method for the treatment of many complex congenital heart diseases, and is commonly used in children with congenital heart diseases. By artificially causing pulmonary artery stenosis, the purpose of reducing pulmonary blood flow and reducing pulmonary artery pressure is achieved. The current pulmonary artery banding has the following defects: 1. Surgical thoracotomy must be performed, which involves large trauma and high risk; 2. Therefore, general anesthesia and positive pressure ventilator must be used, which have a great impact on pulmonary artery pressure. 3. ...

AI Technical Summary

Problems solved by technology

The current pulmonary artery banding has the following defects: 1. Surgical thoracotomy must be performed, which involves large trauma and high risk; 2. Therefore, general anesthesia and positive pressure ventilator must be used, which have a great impact on pulmonary artery pressure. 3. Pulmonary artery banding is not easy to grasp the degree of constriction during the operation. When the patient wakes up after anesthesia, the pulmonary artery pressure is often different from the situation under anesthesia during the operation, resulting in poor surgical efficacy and high postoperative complications. Rate and mortality (13%~31%)

4. The trunk of the pulmonary artery is underdeveloped at the fixed band and often forms severe fibrosis, which artificially causes pulmonary artery stenosis. Pulmonary angioplasty is required for reoperation, which increases the difficulty of the operation. Some patients even suffer from pulmonary artery fibrosis. Requires third surgery to correct pulmonary stenosis

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