CFR › Title 21 › Part 870 › §870.180021 CFR §870.1800Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A withdrawal-infusion pump is a device designed to inject accurately drugs into the bloodstream and to withdraw blood samples for use in determining cardiac output.(b)Classification. Class II (performance standards).