A cleaning catheter includes tubular main body, shaped so as to define a distal-most suction orifice； and a suction lumen arranged along the main body in intermittent fluid communication with a suction source. A distal portion of the suction lumen is in fluid communication with the distal-most suction orifice. An outer wall of the main body is shaped so as to define an opening extending through the outer wall into the suction lumen at an axial location proximal to the distal-most suction orifice. An inflatable element is mounted to the main body along the opening. A collapsible membrane is positioned along the opening within an interior of the inflatable element, so as to define an inflatable chamber between a wall of inflatable element and the collapsible membrane. The collapsible membrane is positioned to at least partially occlude the suction lumen upon at least partial inflation of the inflatable chamber.
