Abstract:Abstract: Objective?To develop a single pigtail anti-reflux and recyclable plastic stent in malignant biliary tract obstructive diseases especially in high biliary tract obstructive diseases. The stent should be with good yellowing reduction effect, low incidence of reflux and obstruction, and easy recovery.?Methods?34 cases of high malignant biliary obstructive patients from 1st Feb 2017 to 31st Jan 2019 was implanted biliary stents via duodenum endoscope. The clinical data was analyzed: 40 plastic biliary stent was implanted, only 1 of them implanted common plastic stent, 4 of them implanted 1 single pigtail plastic stent, while the other 6 patients implanted 1 common plastic stent occurred obstruction and replaced single pigtail plastic stent. Postoperative follow-up was conducted to compare the changes of liver function, the incidence of reflux and the incidence of obstruction.?Results?New single-pigtail plastic stent was applied to treat high malignant biliary tract obstruction, and the postoperative liver function indexes, reflux incidence and re-obstruction incidence were significantly different from those of common plastic stent (P < 0.05); In the same patient, the common plastic stent and the single pigtail plastic stent were respectively implanted, and the difference in postoperative liver function index, incidence of reflux and incidence of obstruction were statistically significant (P < 0.05).?Conclusion?Single pigtail plastic biliary stent implantation has good yellowing reduction effect, low reflux incidence and re-obstruction rate, and easier stent recovery, making it a better choice for patients with malignant biliary tract obstruction, especially those with high biliary tract obstruction.