A Polycarbonate Nasal Mask is a type of respiratory mask used in medical applications, particularly in the field of non-invasive positive pressure ventilation (NIV) or continuous positive airway pressure (CPAP) therapy. These masks are designed to be worn over the patient's nose to deliver positive airway pressure, typically to treat conditions like sleep apnea, respiratory failure, or other respiratory disorders. Polycarbonate is a type of thermoplastic known for its high strength, durability, and optical clarity. It is often used in medical devices due to its ability to withstand repeated use and sterilization processes. Polycarbonate Nasal Mask IS commonly used in the treatment of obstructive sleep apnea, where they help keep the upper airway open during sleep by providing a continuous stream of air or oxygen.