Transcatheter implanted artificial aortic valve stent and delivery system thereof

Abstract

The invention provides an artificial aortic valve stent implanted through a catheter, which includes a stent and an artificial valve. The stent is made of elastic fiber-like material in a "dumbbell-shaped" structure, including a head, a waist and a tail. The surface is covered with a layer of biocompatible film, and the end of the bracket is provided with an installation anchor. Also provided is a delivery system for delivering the stent, which is composed of an outer sheath, an inner core, a loader, a push rod and a fixing head, wherein the installation anchor at the end of the stent is installed on the fixing head, and the artificial aortic valve stent is inserted through the puncture method. transported into the body. The stent is closer to the physiological anatomical structure, self-expanding and detached, using an artificial biological valve, which is close to the artificial valve for energy supply, and the delivery system can be slightly modified from the delivery system of the congenital heart disease occluder, so that the interventional treatment is structured Heart disease equipment is gradually standardized and standardized, while saving resources and reducing consumption.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to an artificial aortic valve stent implanted through a catheter and a delivery system thereof. Background technique [0002] With the advent of an aging society, aortic stenosis will become one of the most common adult valve diseases. Surgical valve replacement is the only effective treatment that improves the patient's symptoms and signs and prolongs life. However, even in developed countries, there are still many patients with severe aortic stenosis who cannot undergo surgical treatment due to advanced age and various comorbidities. At the same time, some patients are reluctant to undergo surgery due to fear of surgical complications. In December 2002, Cribier et al. reported the first case of transcatheter aortic valve replacement in humans. At present, this technology is gradually being used clinically and may become a new treatment method for aortic valve stenosis. ...

AI Technical Summary

Problems solved by technology

[0004] At present, artificial valve implantation methods include surgical implantation, transcatheter implantation, and percutaneous puncture implantation. However, surgical implantation uses surgical thoracotomy, which involves large trauma and high surgical risks. Surgical operations cannot be performed due to advanced age and symptoms. Patients with psychological barriers to surgical complications, therefore, surgical implantation is more limited

The existing transcatheter implantation of stainless steel valve stents requires balloon expansion to implant the valve stent into the body. Due to balloon expansion, this method is likely to cause the risk of serious complications such as pericardial tamponade and myocardial infarction

However, percutaneous puncture and antegrade implantation, because of the puncture of the interatrial septum, the operation is more complicated, which may cause mitral valve damage, and the mechanical stress acts on the valve stent and surrounding tissues, which may easily cause paravalvular leakage.

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