CFR › Title 21 › Part 870 › §870.138021 CFR §870.1380Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A catheter stylet is a wire that is run through a catheter or cannula to render it stiff.(b)Classification. Class II (performance standards).