CFR › Title 21 › Part 870 › §870.517521 CFR §870.5175Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A septostomy catheter is a special balloon catheter that is used to create or enlarge the atrial septal defect found in the heart of certain infants.(b)Classification. Class II (performance standards).