Title 21: Food and Drugs
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/ PART 868 - ANESTHESIOLOGY DEVICES
/ Subpart B - Diagnostic Devices / § 868.1750 Pressure plethysmograph.
§ 868.1750 Pressure plethysmograph.
(a) Identification. A pressure plethysmograph is a device used to determine a patient's airway resistance and lung volumes by measuring pressure changes while the patient is in an airtight box.
(b) Classification. Class II (performance standards).