Biodegradable anti-displacement esophageal stent and preparing method

Abstract

The invention discloses a biodegradable anti-displacement esophageal stent and a preparing method. The esophageal stent comprises a forward first V circular ring, a symmetrical backward second V circular ring and a middle stent body of a rhombus mesh-shaped structure. The tail portion of the first V circular ring is connected to the corresponding end of the stent body through biodegradable fibers.The tail portion of the second V circular ring is connected to the corresponding end of the stent body through biodegradable fibers. According to the esophageal stent, one single filament penetratesthrough the corresponding positions, so the first V circular ring, the stent body and the second V circular ring are connected together. The stent has good axial compliance, that is to say, the stentcan adapt to the esophageal peristalsis when implanted in esophagus, and displacement is reduced; since the stent body of the rhombus mesh-shaped structure is endowed with large radial supporting force and good axial compliance, the horn-shaped V circular rings can prevent the stent from displacement.

Description

technical field [0001] The invention relates to the field of esophageal stents, in particular to a biodegradable anti-displacement esophageal stent and a preparation method. Background technique [0002] Esophageal stenosis causes dysphagia, and patients have eating disorders, which seriously affect the quality of life. The esophagus can be effectively supported by placing an esophageal stent. The use of degradable materials to prepare esophageal stents can avoid intimal proliferation in the later stage, and after the mechanical support is completed in the esophagus, it will be completely degraded into small molecular substances, which can be completely absorbed by the human body or excreted through the respiratory system or urinary system. At present, the degradable polymer materials commonly used in the preparation of degradable intravascular stents include polylactic acid (PLA), polyglycolic acid (PGA), polyglycolide lactide (PLGA), polydioxanone (PDO) and other degrada...

AI Technical Summary

Problems solved by technology

At present, most of the esophageal stents used clinically at home and abroad are one-piece structures with enlarged ends. The axial stiffness of the stents is relatively large, which often cannot meet the compliance requirements for esophageal peristalsis, and is prone to displacement, which brings great pain to patients.

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