Hydraulic, pneumatic, or photoelectric plethysmographs.

21 C.F.R. § 870.2780
in effectEffective: 2024-07-01
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(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).

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