An Ambu bag, also known as a manual resuscitator or bag-valve-mask (BVM), is a medical device used to provide artificial ventilation to patients who are not breathing or who are experiencing breathing difficulties. The main parts of an Ambu bag include:

1. Bag: The bag is the part of the Ambu bag that the healthcare provider squeezes to deliver air to the patient. It is typically made of silicone or other durable materials and is designed to be reusable.
2. Valve: The valve is the component that controls the flow of air into and out of the Ambu bag. It helps prevent air from being forced into the patient’s stomach and allows for the delivery of positive pressure ventilation.
3. Mask: The mask is the part of the Ambu bag that is placed over the patient’s face to deliver air. It is typically made of soft, pliable material and is designed to create a seal over the patient’s nose and mouth to prevent air leakage.
4. Oxygen reservoir: The oxygen reservoir is a feature found in some Ambu bags that allows for the delivery of high concentrations of oxygen to the patient. It works by storing oxygen in a bag attached to the main Ambu bag and delivering it to the patient during ventilation.
5. Pressure relief valve: The pressure relief valve is a safety feature that prevents excessive pressure from building up in the Ambu bag and the patient’s airway. It opens automatically when the pressure exceeds a certain level, allowing excess air to escape.
6. PEEP valve: PEEP stands for Positive End Expiratory Pressure. This valve is used to deliver a continuous positive pressure to the patient’s airway during exhalation. This helps keep the airway open and can improve oxygenation in certain patients.