One-piece cobra biliary stent system

Abstract

The invention provides an integrated cobra-shaped biliary stent comprising a biliary stent body, a stent push pipe, a stent guiding pipe, and a stent protection casing pipe. The stent guiding pipe passes through the stent push pipe and the biliary stent body successively to connect a loop and a through hole pedestal into one. The stent protection casing pipe sleeves the top ends of the biliary stent body and the stent push pipe to protect the stent structure before usage. The biliary stent body is in an oblique S shape, the other end of the biliary stent body is in a shape like alpha, and the middle part of the biliary stent body serves as a drainage segment. Under guidance of a guide wire, the integrated biliary stent can pass through a choledochal duct cut, a T-shaped pipe sinus tract, and a percutaneous transhepatic biliary puncture sinus tract successively and then enters a biliary drainage part in a direct motion manner or can be placed into a biliary drainage part through a duodenoscope in a retrograde motion manner. The stent can fall automatically. Different stent drainage time can be obtained by selecting S-shaped structures with different radians according to clinic demands; and on the basis of the special S-shaped structure of the stent, a phenomenon that pancreatitis is caused because of pressing at a pancreiatic duct opening when the stent is discharged out of the biliary duct can be avoided.

Description

Technical field: [0001] The invention relates to a stent for biliary drainage, an integrated cobra-shaped detachable biliary stent system. Background technique [0002] In the surgical treatment of choledocholithiasis or endoscopic sphincterotomy, a biliary stent is often used to place the bile duct into the bile duct for bile drainage. Currently, the commonly used biliary stent is an integrated plastic stent, that is, the stent, the stent pushing tube and the stent. The guide tube is connected as a whole, and the stent can be retrogradely inserted into the duodenum and bile duct through the endoscope, or placed antegrade into the bile duct and duodenum through the surgical incision of the common bile duct. However, this one-piece plastic stent is hard and is fixed in the bile duct by the barbs at both ends, so it cannot fall off by itself. It needs to be taken out again through endoscopy after the purpose of treatment or prevention is achieved, which increases the pain of t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the non-detachment of the existing integrated biliary stent and the above various defects of the existing self-falling biliary stent, the present invention provides an integrated cobra-shaped biliary stent, which is designed according to the anatomical structure and physiological characteristics of the human bile-pancreatic duct In the shape of a cobra, one end of the bracket is obliquely S-shaped, the other end is α-shaped, and the middle is the drainage section

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