Which kidney stone technique leaves no stone behind?

This trial compares three ways to remove kidney stones using a scope inserted through the urinary tract. Some patients will have the procedure without a protective sheath, while others will use a flexible sheath, with either low or high laser power. The goal is to see which approach clears the most stones completely, as confirmed by a CT scan three months later. The study also tracks surgery time, laser use, and any complications to find the safest and most effective method.