CFR › Title 21 › Part 870 › §870.124021 CFR §870.1240Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A flow-directed catheter is a device that incorporates a gas-filled balloon to help direct the catheter to the desired position.(b)Classification. Class II (performance standards).