A cleaning catheter 200 defines distal suction orifices 440, and includes an inflatable element 588 mounted to a main body 210. An input module 156 includes: (i) an inflation chamber 335； (ii) a flow regulator 700, which defines a suction port 830 coupled in fluid communication with a suction source 601； and (iii) a mechanical user control element 320, which mechanically and non-electrically (a) sets fluid-control states of the flow regulator 700 and (b) increases pressure in the inflation chamber 335. The input module 156 is arranged such that: (a) when the user control element 320 is in a first configuration, the flow regulator 700 blocks fluid communication between the suction source 601 and the distal suction orifices 440, and (b) when the user control element 320 is in a second configuration, the flow regulator 700 (A) connects the suction source 601 and the distal suction orifices 440 in fluid communication, and (B) connects the inflation chamber 335 and the inflatable element 588 in fluid communication to inflate the inflatable element 588.
