CFR › Title 21 › Part 870 › §870.407521 CFR §870.4075Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. An endomyocardial biopsy device is a device used in a catheterization procedure to remove samples of tissue from the inner wall of the heart.(b)Classification. Class II (performance standards).