Full-film-coated self-expanding recyclable biliary tract metal stent

Abstract

The invention provides a full-film-coated self-expanding recyclable biliary tract metal stent. The stent comprises a stent body, a recycling line and an assembly line. The stent body is formed by weaving nickel-titanium alloy wires and is in a grid shape. The two ends of the stent body are spherical, and the stent body is cylindrical. The inner surface and the outer surface of the stent body are both coated with silica gel films. The recycling line is an annular metal wire, one end of the recycling line penetrates through and winds around the alloy wire at the head end of the stent body, and the other end of the recycling line is led out of a cavity of the stent body. The assembly line is an annular metal wire and penetrates through and winds around the alloy wire at the tail end of the stent body. The stent can be completely placed in the common bile duct and used for supporting the common bile duct of benign and malignant stenosis without damaging the leakproofness of the common bileduct, and the probability of stent blockage and reflux cholangitis after an operation is low. The completely exposed head end of the stent body is spherical and can prevent the stent from shifting. By pulling the recycling line exposed out of the duodenum cavity, the head end of the stent body is tightened and enters the cavity of the stent body, the stent is gradually separated from the bile duct mucosa, and therefore the resistance of taking out the stent is greatly reduced.

Description

technical field [0001] The present invention relates to the field of minimally invasive medical technology and surgical instrument technology, in particular to a fully covered self-expandable metal stent for the biliary tract, which is a duodenal stent used for the treatment of benign and malignant strictures of the biliary system. Instruments for minimally invasive surgery under the microscope. Background technique [0002] Extrahepatic bile duct stricture is a common clinical disease and frequently-occurring disease, including inflammatory bile duct stricture, traumatic bile duct stricture, bile duct anastomotic stricture after liver transplantation, malignant bile duct stricture, etc. Poor bile excretion can cause chills, high fever, jaundice, and epigastric pain. Persistent obstruction can cause cholestatic cirrhosis, liver failure, and even endanger the life of the patient. [0003] The treatment of extrahepatic bile duct strictures includes surgery, endoscopy and inte...

AI Technical Summary

Problems solved by technology

During the clinical operation, it was found that if the diameter of the stent is larger than that of the common bile duct stent or if it is placed for too long, the head or tail of the stent may be wrapped by the bile duct mucosa and embedded in the wall of the bile duct. The stent is difficult to separate from the bile duct wall, making it difficult to remove the stent

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