21 C.F.R. § 870.2780 Hydraulic, pneumatic, or photoelectric plethysmographs.
Title 21 - Food and Drugs
(a) Identification. A hydraulic, pneumatic, or photoelectric plethysmograph is a device used to estimate blood flow in a region of the body using hydraulic, pneumatic, or photoelectric measurement techniques. (b) Classification. Class II (performance standards).
Title 21: Food and Drugs
PART 870—CARDIOVASCULAR DEVICES
Subpart C—Cardiovascular Monitoring Devices
§ 870.2780 Hydraulic, pneumatic, or photoelectric plethysmographs.