Stent retrieval device

Abstract

The invention discloses a stent retrieval device which comprises a handle assembly, a sleeve, an inner core assembly, a hook, a pull wire and an expansion ferrule. According to the scheme, the pull wire, the inner core assembly, the expansion ferrule and the hook are sequentially driven by an operating handle to axially move in the sleeve until the tail end of the expansion ferrule extends out of the sleeve and is expanded into a horn mouth shape, and the hook extends out of the expansion ferrule and hooks the stent; in the retrieval process, the pull wire is driven by the operating handle to drive the hook and the stent to move towards the horn-mouth-shaped end of the expansion ferrule at the same time; and after moving for a certain stroke, the horn-mouth-shaped end of the expansion ferrule completely wraps the stent and the hook due to compression of the sleeve and then enters the sleeve together, the expansion ferrule and the inner core assembly are driven to continue to move towards the operating handle to be retrieved, and secondary injury to a patient is avoided.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to a stent recovery device. Background technique [0002] Biomedical stents are widely used in the diagnosis and treatment of diseases. For example, gastrointestinal stents can be used for the treatment of diseases such as gastrointestinal stenosis, gastrointestinal rupture, and anastomosis after gastrointestinal resection. The stent can be used for intravascular plaque, vascular blockage, vascular stenosis, etc. At present, non-degradable materials are mainly selected as stent materials, especially memory metals such as nickel-titanium alloys. When the anastomosis is healed or the disease improves, the function of the stent has been completed, and the stent needs to be recycled; or if the stent is in an improper position, falls off, or the patient has adverse reactions, the stent also needs to be recycled. However, how to recover the stent is still a difficult problem. [0003]...

AI Technical Summary

Problems solved by technology

However, how to recycle the stent is still a problem

[0003] The traditional recovery method is to use hooks, biopsy forceps, foreign body forceps, etc. to hook the stent and pull it out forcibly with the aid of an endoscope. This method has the following problems: First, the gap between the surrounding tissue of the stent and the stent There may be adhesion, these devices cannot guarantee the hooking of the stent, and may fail due to adhesion to the cavity mucosa during the removal process; second, the stent is usually designed to be close to the diameter of the cavity, and if it is pulled out forcibly, it is likely to be pulled out. In the process of pulling out, the inner wall of the cavity is scratched, causing injury to the patient; third, these devices are difficult to grasp during use, and it is easy to fall off after grasping

However, in the actual operation process of this scheme, there are also problems such as the inability to completely gather the compressed stents, and the operation is difficult.

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