Clinical Navigation and Procedural Selection
Selecting the appropriate ureteroscope is a strategic decision based primarily on the anatomical location of the pathology. Semi-rigid ureteroscopy is the undisputed primary choice for stones and lesions located in the distal and middle segments of the ureter.
In these regions, the straight path allows the rigid scope to reach the target quickly and safely. The stability of the semi-rigid scope is particularly advantageous when dealing with "impacted" stones that are embedded in the ureteral wall, as it provides the necessary leverage for laser fragmentation and subsequent basket extraction. However, attempting to use a semi-rigid scope in the upper ureter or kidney carries a high risk of "mucosal stripping" or perforation due to the natural curves of the anatomy.
Flexible ureteroscopy is reserved for the proximal ureter and the intrarenal environment, a procedure often referred to as Retrograde Intrarenal Surgery. The ability to deflect the tip allows the surgeon to "look around corners" and enter individual renal calyces to treat stones that were previously only accessible through more invasive percutaneous methods. To facilitate these procedures, surgeons often use a "ureteral access sheath"—a hollow tube placed over a guidewire that acts as a protected highway for the flexible scope. This sheath protects the ureter from trauma during repeated scope entries, helps maintain low intrarenal pressure by allowing irrigation fluid to drain, and significantly improves the surgeon's visibility during the fragmentation of large stone burdens.