Retrograde Intrarenal Surgery. Retrograde intrarenal surgery (rirs) is a novel technique, initially performed in 1983 mainly used for renal pathologies like, but not limited to, stones. The introduction of robotics has revolutionized surgery.
Rirs uses a laser and a fiberoptic endoscope, a viewing tube that passes through the urethra and into the kidney to remove stones without making any incisions on the kidney. Retrograde intrarenal surgery (rirs), also known as flexible ureterorenoscopy (furs) is an effective and safe method for the management of intrarenal stones.