Using this instrument, the entire ureter can be viewed. Due to the flexibility of the instrument, the renal pelvis and chalices can also be viewed. It contains fibre optics, a flushing channel (the examination is carried out under continuous irrigation with saline) and one or two working channels. The instruments that pass through this instrument into the organ are correspondingly thin. Their power is therefore limited. Using ureteroscopy, tissue biopsies can be taken or stones can be crushed and processed. In some cases, entire stones can be recovered and removed.