Ureteral Access Sheath is a medical device used in urology to facilitate the insertion of instruments, such as ureteroscopes, into the ureter and kidney during minimally invasive procedures. It is a hollow, flexible tube that provides a stable pathway, protecting the ureter from trauma and improving the efficiency of procedures like stone removal, tumor biopsy, or stricture treatment. Ureteral access sheaths are essential tools in modern endourology, enhancing both patient safety and procedural success.

A Y-Type Ureteral Access Sheath (UAS) is a specialized urological instrument designed to facilitate Retrograde Intrarenal Surgery (RIRS), primarily for the treatment of kidney stones. Its defining characteristic is a Y-shaped connector at its proximal end, which provides two independent pathways: one for the primary surgical scope/instruments and a dedicated second one for continuous irrigation or the passage of auxiliary tools. This design offers superior control over fluid dynamics within the kidney compared to standard sheaths, enhancing both safety and efficiency.