Nipper type full-coated film self-expandable metal stent releasing and retracting device

Abstract

The invention belongs to the technical field of medical apparatuses, and particularly relates to a nipper type full-coated film self-expandable metal stent releasing and retracting device for endoscope retrograde cholangiopancreatography. The device comprises an inner core tube, an inner cannula, an outer cannula and a nipper; the tail end of the inner core tube is a double-cavity catheter, a tubecavity I of the inner core tube passes through the nipper, a nipper tube of the nipper is a single cavity tube, a nipper connecting rod passes through the inside of the nipper tube, a tube cavity IIof the inner core tube passes through a zebra guidewire and is communicated with a single cavity catheter of the head end of the inner core tube, a groove shaped like a Chinese character 'ao' is formed in the junction of the single cavity catheter of the inner core tube and the double-cavity catheter of the inner core tube, and the head end of the inner core tube is connected with a tapered cap with a hole; the inner core tube is sleeved with the inner cannula, and the inner cannula is sleeved with the outer cannula. The device can be widely applicable to the fields of coated retractable metalstent treatment under the endoscope of pancreaticobiliary diseases and the like for promotion and application.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a grasping forceps type full-covered self-expanding 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...

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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 usually 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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