to perform pelvic surgery , a directionally illuminating balloon catheter enters a bladder . the catheter has a multi - lumen shaft . the balloon defines an interior fluidically connected to a balloon inflation lumen and is inflated therethrough . the balloon comprises a light source , a light - radiating surface adjacent the shaft - balloon junction , and a substantially opaque surface disposed at a portion of the balloon other than the light - radiating surface such that the integrated light source illuminates a distal half of the environment outside the balloon . the balloon is inflated while in the bladder . light from the light source is directed out through the light - radiating surface to illuminate at least a portion of a procedure area opposite the bladder - prostate junction . with the light illuminating the portion of the procedure area , at least a portion of a pelvic surgery is performed at the portion of the procedure area .