An accurate positioning esophageal stent delivery system

Abstract

The invention relates to an esophageal stent conveying system accurate in positioning. The esophageal stent conveying system comprises a guide head, a core tube, a central tube, an outer sheath tube, a fixed handle, a large handle and a positioning device. The positioning device comprises a limit sleeve, a fixing sleeve and positioning fixing needles, wherein the limit sleeve is connected to the front end of the central tube, comprises a limit part and a sleeving part, and is provided with a groove along the inner periphery of the sleeving part; the fixing sleeve is located on the front side of the limit sleeve and is slidably connected to the core tube, and the positioning fixing needles are arranged on the outer periphery of the fixing sleeve; an esophageal stent loading area is arranged between the fixing sleeve and the positioning guide head, and limitation and release of the bare-end stent head of an esophageal stent are achieved by the coordination of the positioning fixing needles and the groove. The esophageal stent conveying system has the advantages that displacement and torsion of the esophageal stent in the conveying system can be avoided; the release position of the esophageal stent can be regulated before the positioning device is turned on; the esophageal stent can be recycled and taken out of a human body for replacement, the recycling manner is simple and effective, and excessive partial deformation of the diameter of the conveying system can be avoided.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a precisely positioned esophageal stent delivery system. Background technique [0002] At present, in clinical esophageal interventional therapy, usually under X-ray or endoscopic direct vision, the esophageal stent delivery system is used to deliver the memory alloy esophageal stent to the lesion, and then the esophageal stent is released, using the radial direction of the esophageal stent itself. The supporting force achieves the purpose of treating or relieving the disease. The structure of the current esophageal stent delivery system includes an outer sheath tube, a middle tube, a core tube, a positioning guide head, a large handle, a fixed handle and a small handle. The connection situation is: the front end of the core tube is the positioning guide head, followed by the middle tube and the small handle; the middle tube is followed by the outer sheath tube, the larg...

AI Technical Summary

Problems solved by technology

It has two shortcomings: one is that if the position of the esophageal stent is found to be wrong after being released or the position of the stent needs to be slightly adjusted, it cannot be adjusted, which increases the difficulty of the operation or may lead to the failure of the operation; the other is that the esophageal stent is easy to transport Torsional displacement in the outer tube of the system, which may lead to difficulty in release leading to surgical failure or protracted surgical time

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