New 14-mm diameter Niti-S biliary uncovered metal stent for unresectable distal biliary malignant obstruction

Figure 1 Niti-S 14 appearance with a braided structure made from nitinol, and a large diameter of 14 mm with a length of 60 or 80 mm.

Figure 2 Stent placement of Niti-S 14 after sphincterotomy in pancreatic cancer. A: Endoscopic view; B: Picture of endoscopic retrograde pancreatocholangiography.

Figure 3 Endoscopic view of the duodenal major papilla after Niti-S 14 placement. The bile duct cavity is maintained despite bile duct mucosa or tumor growth into the stent.

Figure 4 Kaplan-Meier analysis of stent patency. The non-RBO rates of 3, 6 and 12 mo were 100%, 91% and 78%, respectively. RBO: Recurrent biliary obstruction.

Figure 5 Kaplan-Meier analysis of survival. The median survival time was 120 d.