bile duct speculum的用法和样例：
- Clinical Observation on Postoperative Calculus of Intrahepatic Duct Treated by Qingshi Decoction Matched with Bile Duct Speculum
- Treatment of iatrogenic bile duct injury.
- In addition, bile duct antrum but outspread.
- The bile duct was showed truncate or strictured.
- NAS were most prevalent in the extrahepatic bile duct.