A flexible aeration panel is described, which does not include a rigid support plate. Alternatively, a smaller grid array is used which only includes the putamen target and not the caudate target, and also has two windows within the grid array. Other embodiments may be described andor claimed. One side of at least one PN-type wafer is attached to a temporary substrate. Expansion of the balloon occludes a portion of the biliary tree and allows the catheter to sweep any gallstones through the sphincter of Oddi into the duodenum.