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Medical stent recovery device

A recovery device and inner core technology, applied in the field of medical devices, can solve problems such as removal adhesion, patient injury, failure to solve the problem of recovery of the lower opening of the stent, and achieve the effect of easy recovery

Pending Publication Date: 2019-05-24
SHANGHAI TONGJI HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to recycle the stent is still a difficult 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, there may be a gap between the surrounding tissue of the stent and the stent. There are adhesions, these devices cannot guarantee to hook the bracket firmly, and the removal process may fail due to adhesion; second, the bracket is usually designed to be close to the diameter of the pipe, if it is pulled out forcibly, it is likely to scratch the inner wall of the pipe during the pulling out process, cause harm to the patient; third, if these devices are large, it is difficult to open in the bracket, and it is very difficult to grasp; if they are small, they are easy to grasp and fall off
The recovery method provided by this patent requires a special stent, which is difficult to be widely used, and it does not consider the possible adhesion between the stent and the tissue. If the adhesion is serious, the magnetic force may be insufficient to resist the adhesion.
Chinese patent document: CN02219251.4, application date: 2002.03.08, patent name: recyclable esophagus and trachea stent, designed a kind of support with nylon recovery l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Please see attached figure 1 , 2 , figure 1 It is a schematic diagram of a three-dimensional structure of a medical stent recovery device of the present invention, figure 2 It is a front view of a medical stent recovery device of the present invention. A medical stent recovery device, the medical stent recovery device includes an inner core 1, a sliding block 2, a middle tube 3, an outer sheath tube 4, a guide wire 5, and a camera 6; the inner core 1 has two, respectively It is a shorter short inner core 11 and a longer long inner core 12; the ends of the short inner core 11 and the long inner core 12 are respectively provided with an inner core handle 13; the top of the short inner core 11 is provided with A forward hook 14 and a positive flap 15; the top of the long inner core 12 is provided with a reverse hook 16 and a reverse flap 17; Both are elastic closed structures; the short inner core 11 and the long inner core 12 are mutually slidable structures through ...

Embodiment 2

[0052] This embodiment is basically the same as Embodiment 1, the difference is that the inner core 1 in this embodiment can be designed with different arcs according to the shape of the stent and the anastomosis site; for example, in the recovery of esophagus-stomach When stenting, the gastric section of the stent is generally relatively wide, and the long inner core 12 can be designed to protrude outward, and be compressed in the outer sheath tube 3 first, and then released from the outer sheath tube 3 after reaching the anastomotic stent. The outer protruding arc is hooked to the reserved line at the gastric end of the stent; after the compression of the stent is completed, the outer sheath tube 3 is pushed forward, the long inner core 12 is compressed into a straight line, and the entire recovery device is withdrawn.

Embodiment 3

[0054] Please see attached Figure 8 , Figure 8 It is a schematic diagram of the connection between the short inner core and the long inner core of another medical stent recovery device of the present invention. This embodiment is basically the same as Embodiment 1, the difference is that the short inner core 11 and the long inner core 12 in this embodiment slide relative to each other using the chute matching structure 8, which is more convenient for push-pull operation.

[0055] A medical stent recovery device of the present invention, the design of the inner core handle, the middle layer tube handle and the outer sheath tube handle is convenient for pushing and pulling the inner core and the outer sheath tube; On the line, it is convenient for the guide wire to pass through, so as to guide and position the recovery device; the pointed design of the soft flap structure at the front end of the outer sheath tube facilitates the device to be placed without scratching the tiss...

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Abstract

The invention relates to a medical stent recovery device which is characterized in that the medical stent recovery device comprises an inner core, a sliding block, a middle tube, an outer sheath, a guide wire and a camera, the inner core comprises a short inner core and a long inner core, inner core handles are arranged at the tail ends of the short inner core and the long inner core, a forward hook and a front movable plate are arranged at the top end of the short inner core, a reverse hook and a back movable plate are arranged at the top end of the long inner core, the short inner core and the long inner core are of mutually slidable structures by the aid of the sliding block, a through hole is formed in the middle of the sliding block, the middle tube is arranged on an outer layer of the inner core and provided with a hollow structure, the outer sheath is arranged on an outer layer of the middle tube, and a soft movable plate structure is arranged at the front end of the outer sheath. The medical stent recovery device has the advantage that by cooperation of the inner core, the middle tube and the outer sheath, the medical stent recovery device can be used for recovering or removing stents including, but not limited to a digestive tract stent, a respiratory tract stent and a cardiovascular stent.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a medical 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 internal stent can be used for intravascular plaque, vascular obstruction, vascular stenosis, etc. At present, the main choice of stent materials is still non-degradable 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 recycle the stent is ...

Claims

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Application Information

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IPC IPC(8): A61F2/966
Inventor 胡世钰周永新王文利
Owner SHANGHAI TONGJI HOSPITAL