Release and retrieval unit of fully-covered self-expanding metal stent

Abstract

The invention belongs to the technical field of medical instruments and particularly relates to a release and retrieval unit of a fully-covered self-expanding metal stent for endoscopic retrograde cholangiopancreatography, comprising a core tube, an inner sleeve, an outer sleeve, and a loop; the tail end of the core tube is a dual-cavity catheter; cavity I of the core tube passes through a loop metal rod, cavity II is communicated with a single-cavity catheter at the head of the core tube; the connection between the single-cavity catheter of the core tube and the dual-cavity catheter is provided with a U-shaped groove; the head of the core tube is connected with a conical cap having a hole; the core tube is sleeved with the inner sleeve; the inner sleeve is sleeved with the outer sleeve. The release and retrieval unit is suitable for wide popularization and application in the fields, such as endoscopic fully-covered self-expanding metal stenting for biliary-pancreatic diseases.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a fully-covered self-expandable metal stent release and recoverer for endoscopic retrograde cholangiopancreatography. Background technique [0002] Endoscopic retrograde cholangiopancreatography (ERCP) implantation of fully covered self-expandable metal stents is widely used in inflammatory bile duct strictures, malignant bile duct strictures, iatrogenic bile duct strictures, iatrogenic bile duct injuries, bile leaks, pancreatic Compared with traditional laparotomy, it has the advantages of less trauma, higher safety factor, and faster recovery in the treatment of diseases such as ductal stenosis, endoscopic papillary sphincterotomy, or biliary bleeding after balloon dilatation. [0003] At present, the fully-covered self-expandable metal stent and the stent propeller are integrated, and careful positioning is required before the stent is released; the recover...

AI Technical Summary

Problems solved by technology

[0003] At present, the fully-covered self-expandable metal stent and the stent propeller are integrated, and careful positioning is required before the stent is released; the recovery of the fully-covered self-expandable metal stent is mainly by dragging the metal recovery ring with foreign body forceps, so that the metal stent is separated from the biliary tract and removed. Take out the support, the above-mentioned metal support propeller and the metal support removal method have the following disadvantages: 1. The metal support and the propeller are a whole, and its outer packing box is relatively large, which affects the transportation of the support; 2. The metal support is in a recycled state, and the metal support The biofilm on both sides is in a folded state, which can easily lead to damage of the biofilm and separation from the metal wire; 3. The metal stent cannot be recovered into the outer sheath after half of the metal stent is released; 4. The metal stent is placed too high and can compress the intrahepatic bile duct If the position is too low, the stent section exposed to the duodenum is too long; 5. The metal stent placed in an unsatisfactory position can only be taken out, and it is difficult to reposition the released metal stent into the outer sheath, resulting in waste of the stent and medical expenses 6. At present, there is a lack of special tools for the recovery of fully covered metal stents; 7. In clinical practice, the metal stent is often pulled out by pulling the metal recovery ring with biopsy forceps, which is difficult to operate, takes a long time to operate, and takes a long time for X-ray exposure; 8 1. During the removal of the metal stent, the metal stent with a tapered tail can easily damage the bile duct mucosa and duodenal papilla, resulting in biliary bleeding and pancreatitis; 9. It is difficult to remove the metal stent through the duodenoscope forceps, and It is easy to damage the CCD lens of the duodenoscope and the inner wall of the clamp channel during the removal process, resulting in water leakage of the duodenoscope and damage to the duodenoscope; Endoscopy increases surgical risk and prolongs operative time

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