CFR > Title 21 - Food and Drugs > CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER H—MEDICAL DEVICES (parts 800 to 898) > PART 801—LABELING > SUBPART D—Exemptions From Adequate Directions for Use (§801.109 to §801.128) > 801.116—Medical devices having commonly known directions.