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A comparison of the FREDDY and holmium lasers during ureteroscopic lithotripsy

Two laser devices that are used today in endoscopic treatment of renal and ureteral calculi are the frequency‐doubled double‐pulse neodynium:YAG (FREDDY) and Holmium:YAG lasers. The mechanism of action of these lasers differs, thus conferring potentially different safety and efficacy profiles. The in vitro efficacy of these lasers in treating urinary stones has been explored, but to our knowledge no study compares the in vivo efficacy. The purpose of this study is to compare the stone‐free and complication rates of the FREDDY and holmium lasers.