Rat Bile Circuit Catheter or Rat Portal Vein Catheter: TecoFlex PU; OD tapered from 0.055" to 0.035", ID tapered from 0.025" to 0.015", beads at 0.5", 7.62cm and 15.24cm from the tip, length 68.58cm. Sterile. Our Rat Bile Duct Catheters/Rat Portal Vein Catheters feature a tapered design to allow easy insertion into the vessel with strong, sturdy tubing at the externalization point. These catheters are an ideal design for either bile duct and duodenal placement or for the portal vein. All catheters are made from biocompatible polyurethane for low vessel trauma and increased patency. Product is for laboratory animal research only.