Stone Cone Device vs. Standard URS for Proximal Ureteral Calculi

Retrograde migration of stone fragments into the kidney during ureteroscopic lithotripsy(URS) for proximal ureteral stones is a common technical challenge, occurring in 5‐40% ofcases. This can lead to residual fragments and lower stone‐free rates. The Stone Cone isan anti‐retropulsion device designed to trap fragments and prevent their migration. Thisstudy will test the hypothesis that the use of the Stone Cone during URS pneumaticlithotripsy will result in a significantly higher stone clearance rate at 48 hourspost‐procedure compared to the standard technique without the device.