ERCP Pancreatic Duct Stone Extraction

A 48-year-old man with 12 years of alcoholic chronic pancreatitis presents with recurrent severe epigastric pain radiating to the back, weight loss, steatorrhea, and new-onset diabetes mellitus. He stopped drinking 2 years ago but symptoms persist. CT abdomen shows a calcified pancreatic parenchyma, dilated main pancreatic duct (8 mm), and multiple intraductal stones (4–6 mm) impacted in the head region. MRCP confirms ductal obstruction with proximal lithiasis. EUS-FNA excludes malignancy. The structure marked **A** in the diagram represents the first-line endoscopic intervention for this patient's obstructive chronic pancreatitis. Which of the following is the PRIMARY GOAL of the procedure marked **A**?