{"data":{"id":"us/21-cfr-890.1225","jurisdiction":"us","citation":"21 CFR 890.1225","heading":"Chronaximeter.","body":"(a) Identification. A chronaximeter is a device intended for medical purposes to measure neuromuscular excitability by means of a strength-duration curve that provides a basis for diagnosis and prognosis of neurological dysfunction.\n(b) Classification. Class II (performance standards).","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 890—PHYSICAL MEDICINE DEVICES","Subpart B—Physical Medicine Diagnostic Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"9d04d37713e4d4141693edd6827e4a6529afa674445b5d7023cd4401540856ae","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-890.1175","next":"us/21-cfr-890.1375"},"notice":"GroundRules: Original legal text. Not legal advice."}