21 CFR 870.2860 - Heart sound transducer.
(a) Identification. A heart sound transducer is an external transducer that exhibits a change in mechanical or electrical properties in relation to sounds produced by the heart. This device may be used in conjunction with a phonocardiograph to record heart sounds.
Title 21 published on 2014-04-01
no entries appear in the Federal Register after this date.