<qa>  What is the name of the sphincter of Oddi dysfunction?1.3.4 Pinaverium Bromide: able to improve the spasms of SO; literature showed that it treated biliary disorders effectively.1050 of the patients who previously underwent cholecystectomy experience recurrent abdominal pain with or without diarrhea, abdominal distention, enzymatic changes, etc., and sphincter of Oddi dysfunction SOD accounts for about 13 of such cases. 