Anti-reflux biliary drainage stent

Abstract

The invention provides an anti-backflow biliary tract drainage support. The biliary tract drainage support includes (a) a support section (10) of a hollow tube-shaped structure; and (b) a drainage section (20), wherein the drainage section (20) includes a base (21) connected to the support section (20), petaloid members (23) (22) which extend from the base to a far end, and block-like structures (25) positioned at a near side. The biliary tract drainage support can ensure drainage of the biliary tract, can effectively prevent backflow of content of duodenums, and then can reduce the opportunities of support blocking and biliary tract infections.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a reflux-preventing biliary stent. Background technique [0002] Biliary obstruction is a disease with a high mortality rate in surgical acute abdomen, which can be divided into malignant biliary obstruction and benign obstruction. Among them, malignant biliary obstruction is mostly secondary to gallbladder cancer, cholangiocarcinoma, pancreatic cancer and other hepatobiliary malignancies, while benign obstruction is mostly secondary to biliary stones, gallbladder surgery, or chronic pancreatitis. [0003] Under normal conditions, the biliary tract remains sterile due to the tone of the sphincter of Oddis, continuous bile flushing, and the natural biological barrier within the biliary tract. However, when the biliary tract is obstructed, the biological barrier is disrupted, the bile duct is obstructed, cholestasis, and secondary bacterial infection develops. Pathogenic bacteria a...

AI Technical Summary

Problems solved by technology

[0006] However, in the existing biliary tract stents, the position of the stent can be located at the upper end of the duodenal opening of the bile duct and pass through the Oddis sphincter. Although such a stent is fixed in place, the sphincter cannot be contracted, making it easy for biliary bacteria to follow the sphincter. There is almost no barrier to prevent duodenal reflux, which results in stent blockage and aggravated infection

Some stents are located in the common bile duct. Although the anti-reflux function of the Oddis sphincter can be maintained, due to the deep position, the probability of stent displacement is extremely high, and it is difficult to remove the stent after blockage, which limits clinical application.

In addition, there is a biliary metal stent with a larger inner diameter, but this stent is only used for biliary obstruction caused by malignant tumors. Therefore, in the prior art, the biliary stent usually needs to be replaced frequently, which not only increases the pain of the patient, but also reduces the cost of medical treatment. Great waste

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