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Simple diagnostic tools for supplementary diagnostic evaluation in patients with obstructive complications. Hegar dilators (left; optimal are Hegar Nos. with diameters of 5 to 7 mm) are used to demonstrate a stop cock phenomenon as a sign of an excessively tense sling. A bougie à boule (right; optimal are Charrière Nos. with circumferences of 21.0 to 24.0 mm) is used to identify a sling too close to the urethra or a penetrating sling
