A flexible, tubular, manual endotherapy device with an inflatable multi-sizing balloon at the distal end designed for the removal of stones (calculi) in the biliary tract. It is inserted through the working channel of an endoscope, typically beyond the stones where the balloon is inflated and retracted, the balloon pushing the trapped stones before it out of the biliary tract. It typically has more than one lumen to allow,.e.g., use of a guidewire while simultaneously enabling the injection of a contrast medium into the biliary tree for fluoroscopic visualization of the bile ducts. This is a single-use device.