Study of Large Channel Digital Pancreaticobiliary Scope (DPS) With Compatible Accessories

This study is evaluating a new large-channel digital scope (a thin camera inserted through the mouth) for two specific uses during ERCP procedures: examining bile duct narrowings of unknown cause, and removing bile duct stones that couldn't be cleared with standard techniques. This new device may offer better visualization and tools for these challenging situations. **You may be eligible if...** - You are 21 or older and need an ERCP procedure - You have either: an unexplained bile duct narrowing (stricture) that needs further investigation, OR a bile duct stone that could not be removed with standard techniques - You are willing and able to follow study procedures and attend follow-up visits **You may NOT be eligible if...** - You are pregnant or breastfeeding - You have a condition that makes ERCP unsafe - You are unable to provide informed consent Talk to your doctor to see if this trial is right for you.