C0180105 - Devices designed to apply continuous positive airway pressure during both inspiration and expiration while the patient is performing spontaneous breathing. Continuous positive airway pressure (CPAP) units typically consist of a pressurized circuit including a threshold resistor, such as an underwater seal, a weighted ball, or a spring-loaded valve. A threshold resistor is a device that exerts a predictable, quantifiable, and constant force at the expiratory limb, creating a threshold pressure that must be exceeded to allow flow through the valve. The units also include a high-flow gas source and a mask to deliver the pressurized air to the patient; many devices include a manometer. CPAP units usually maintain a baseline airway pressure of 5 to 20 cm of H20 throughout the whole respiratory cycle; the devices require a gas flow greater than the patient inspiratory flow to maintain the desired positive airway pressure. These units are intended to provide noninvasive positive pressure breathing assistance therapy through a mask (either nasal or oronasal), a mouthpiece, or lipseal; they are frequently used to treat central sleep or obstructive apnea disorders. They are not intended for continuous breathing support.

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						CUI C0180105

	UMD			A10991417	AT102976407	Devices designed to apply continuous positive airway pressure during both inspiration and expiration while the patient is performing spontaneous breathing. Continuous positive airway pressure (CPAP) units typically consist of a pressurized circuit including a threshold resistor, such as an underwater seal, a weighted ball, or a spring-loaded valve. A threshold resistor is a device that exerts a predictable, quantifiable, and constant force at the expiratory limb, creating a threshold pressure that must be exceeded to allow flow through the valve. The units also include a high-flow gas source and a mask to deliver the pressurized air to the patient; many devices include a manometer. CPAP units usually maintain a baseline airway pressure of 5 to 20 cm of H20 throughout the whole respiratory cycle; the devices require a gas flow greater than the patient inspiratory flow to maintain the desired positive airway pressure. These units are intended to provide noninvasive positive pressure breathing assistance therapy through a mask (either nasal or oronasal), a mouthpiece, or lipseal; they are frequently used to treat central sleep or obstructive apnea disorders. They are not intended for continuous breathing support.