CSN EN ISO 20696 This document specifies requirements and test methods for sterile urethral catheters for single use, with or without a balloon. This document does not include drainage catheters covered by ISO 20697, e.g. ureteral catheters, nephrostomy catheters, and suprapubic catheters. This document also excludes ureteral stents. NOTE: Ureteral stents are covered in ASTM F1828-97. Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.