The ClearPetra System for Continuous Flow Lithotripsyof Well Lead Medical is designed for the effective andefficient treatment of urinary stones using NegativePressure Aspiration through an oblique side port on theClearPetra sheath. It has high stone clearance rate, reduces the intra-luminal pressure in the urinary tract, prevents stone retropulsion, improves visual field, obviates the need of stone baskets, forceps, or any anti-retropulsion devices, and saves operating time.