?:definition
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Ureteral dilators designed to provide access through a passage (i.e., sheath) into the upper urinary tract. These dilators typically consist of a flexible plastic sheath that may have one or more channels that permit the introduction of endoscopes and working instruments (e.g., stone baskets, laser fibers) into the ureters; the dilators may be used also for irrigation and/or introduction of contrast media. Access sheath ureteral dilators are intended for use during urologic endoscopic procedures of the ureters and/or other parts of the upper urinary tract.
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