Endoscopic stent configuration and bile flow rates in a variable diameter bile duct model

Area of Science:

• Gastroenterology and Hepatology
• Medical Device Engineering
• Biliary System Physiology

Background:

• Endoscopic biliary stenting is crucial for managing biliary strictures and obstructions.
• Stent patency, essential for effective bile drainage, is influenced by bile flow rate.
• Understanding factors affecting bile flow is key to optimizing stent performance.

Purpose of the Study:

• To investigate how stent diameter, configuration (straight vs. pigtail), and common bile duct (CBD) diameter impact bile flow rates.
• To compare the efficacy of different stent types and sizes in simulated biliary environments.

Main Methods:

• Simulated bile flow rates were measured using straight and pigtail stents (7 Fr and 10 Fr).
• Experiments were conducted using common bile duct models with 1 cm and 2.3 cm diameters.
• Flow rates were analyzed in relation to stent configuration, diameter, and simulated duct size.

Main Results:

• Higher bile flow rates were observed with straight stents and larger 10 Fr stents.
• Common bile duct diameter did not affect flow rates in pigtail stents.
• While flow rates decreased with increasing duct diameter for straight stents, they remained consistently higher than pigtail stents.

Conclusions:

• Straight stents demonstrate superior bile flow rates compared to pigtail stents.
• The 10 Fr diameter is associated with enhanced bile flow.
• Straight stents are recommended over pigtail stents for treating biliary obstruction in both dilated and non-dilated biliary systems.