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Comparison of two types of single-balloon endoscopes. A: Comparison of working lengths of two types of single balloon endoscopes (SBEs). Left: SIF-Q260 (working length 2000 mm); Right: SIF-Y0004 (working length 1520 mm); B: Comparison of working channel diameters of two types of SBE. Left: SIF-Q260 (working channel diameter 2.8 mm); Right: SIF-Y0004 (working channel diameter 3.2 mm and water-jet channel).
