A fully fitting esophageal stent conforming to esophageal peristalsis

Abstract

The invention relates to a fully fitting esophageal stent complying with esophageal peristalsis. The esophageal stent is composed of three sections in smooth connection with each other, wherein the sections at the two ends are thick and the section in the middle is thin; the two end sections have a shape of cylinder encircled by a single-layer net; the middle section is formed by spirally winding a bar-shaped screen mesh in equal width; an upper hook is arranged at the upper end of the bar-shaped screen mesh; a lower hook is arranged at the lower end of the bar-shaped screen mesh; the upper hook and the lower hook are buckled with each other when the bar-shaped screen mesh is spirally wound; the cross section of the bar-shaped screen mesh is of step shape. The esophageal stent is formed by spirally winding the bar-shaped screen mesh in equal width, so that the esophageal stent has flexibility and following capacity, the esophageal peristalsis can be extremely transferred to the food and the food can be more easily swallowed; the displacement resistance of the esophageal stent can be further enhanced by the following capacity of the esophageal stent; the influences of the stent on the esophageal function and structure are greatly improved; the stent is more comfortable for the patient and is fully fit with human esophageal wall; the trachea is extremely prevented from being pressed by the stent.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an esophageal peristalsis-compliant full-fit esophageal stent. Background technique [0002] Esophageal stents are effective in treating benign / malignant esophageal stenosis, acute esophageal perforation, esophageal fistula, and achalasia, especially for patients with acute esophageal perforation and esophageal fistula. An invasive approach to the treatment of critically ill patients. Endoscopic treatment of esophageal carcinoma in situ and precancerous lesions, endoscopic expansion of esophageal stenosis, and radiotherapy for advanced esophageal cancer can cause postoperative esophageal stenosis, intraoperative esophageal perforation, and esophageal fistula after treatment. Fully covered esophageal stents are used Can effectively reduce and treat the above complications. The esophageal stents currently in clinical use are mainly self-expandable metal stents (SEMS) and ...

AI Technical Summary

Problems solved by technology

The disadvantages of SEMS are: the tension at both ends of the stent is high, which can easily cause the growth of new granulation tissue and cause restenosis; the stent is hard and has no peristalsis, and the incidence of local discomfort and pain after insertion is high.

The disadvantages of SEPS are: the implantation technique is complicated, the implantation process is painful, and the incidence of stent displacement is high after implantation.

[0003] Normal human esophageal lumen is elliptical, but the existing esophageal stents are all cylindrical. This kind of esophageal stent cannot fully fit the esophageal wall. In addition, the existing stents cannot follow the esophagus. If the movement cannot be transmitted from the stent to the food, the purpose of wriggling the food to make it swallow cannot be well achieved; the inability of the stent to wriggle is the reason for the discomfort and pain of varying degrees when swallowing saliva and food; the cylindrical shape of the esophageal stent , and one of the most serious complications is that it may push the trachea in front of it, causing fatal tracheal stenosis

For example, the Chinese invention patent with the publication number CN104107099A discloses an esophageal stent, in which the design of the expansion ring can only prevent falling off, and cannot transmit the peristalsis of the esophagus to the food. In addition, this stent cannot fully fit the esophageal wall.

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