Which type of waves can be used to clear a blockage from small tubes in the kidneys

The blockage in the small tubes in the kidneys it is denoted as urinary tract obstruction. This blockage inhibits the flow of urine through its normal path.  

Sound waves and visible light  are the waves used to clear a blockage from small tubes in the kidneys. The procedure through which the blockage is removed is called Shock Wave Lithotripsy (SWL).

this is really easy just look up what these words mean