The ClearPetra® Ureteral Access Sheath, also referred to as Vacuum Assisted Ureteral Access Sheath or Suction Ureteral Access Sheath in the literature, has an oblique side branch with pressure vent, that can be connected to negative pressure aspiration, and a flexible tip that can be passively deflected 180° to the lower pole calyces by the flexible ureteroscope, allowing for efficient and effective treatment of urinary stones.

"Several centers have conducted experimental and clinical studies on suctioning use during PCNL, mPCNL, and ureteroscopy and concluded that it is an effective and safe adjustment that improves stone-free rates and limits complication rates after these procedures.

Suctioning use during common endourological procedures led to improved safety and efficacy among several indications"