Partial-rebreathing oxygen face mask

A partial-rebreathing oxygen face mask is a medical device designed to deliver a controlled blend of oxygen and air to patients requiring supplemental breathing support. It features a reservoir bag that traps some exhaled air, allowing the patient to rebreathe a portion of it while inhaling fresh oxygen, which helps maintain a consistent oxygen concentration during use.

These masks are typically single-use, non-sterile, and made from flexible polymers to ensure a comfortable, airtight seal against the face. Regulation varies by jurisdiction, but they are generally classified based on their intended use and risk level, with compliance requirements covering material safety, performance, and labeling standards.