An oxygen mask is a common medical consumable. It is linked to oxygen cylinders and delivers oxygen to the human body to treat hypoxia caused by hypoxemia caused by various reasons.
There are two common oxygen masks in hospitals:
Venturi Oxygen Mask
What is the Venturi oxygen mask?
Venturi oxygen mask refers to an oxygen therapy device that uses the Venturi principle to mix a certain flow of air with oxygen to form a high-speed airflow and deliver it to the patient. As a kind of high-flow oxygen supply system, the venturi oxygen mask can provide up to 50% oxygen concentration, and the oxygen flow rate is above 40L/min. It has the characteristics of high flow rate and relatively accurate oxygen concentration and is widely used in clinical practice.
The working principle of the venturi oxygen mask:
When a certain flow of oxygen passes through a jet hole with a smaller cross-sectional area, the flow rate increases to form a high-speed airflow, which generates a certain negative pressure, which is then drawn into the surrounding air, and finally forms a high flow air-oxygen mixed airflow. According to its principle, the intake oxygen concentration is related to the diameter of the jet hole, the airflow inlet diameter, and the oxygen flow. Therefore, the venturi oxygen mask can adjust these parameters to achieve different oxygen concentrations.
Compared with ordinary oxygen masks, the biggest advantage of the Venturi oxygen mask is that it can provide higher flow and higher accuracy of oxygen concentration. On the one hand, when the provided flow rate is higher than the patient’s peak inspiratory flow rate, the patient will not inhale the surrounding air, thereby ensuring a stable, precise, and controllable oxygen concentration. On the other hand, high-flow gas can have a certain flushing effect on the patient’s exhaled breath and prevent repeated breathing. However, the Venturi oxygen mask also has disadvantages, that is, high-flow airflow may cause drying of the airway mucosa, so it is necessary to pay attention to real-time monitoring of the patient’s condition when using it.
Oxygen Storage Oxygen Mask
This kind of oxygen mask is also called a non-rebreathing mask, which is composed of an oxygen storage bag, a T-shaped three-way medical oxygen mask, and an oxygen catheter.
In addition to the oxygen storage bag, this mask has a one-way valve between the mask and the oxygen storage bag. When the patient inhales, oxygen is allowed to enter the mask, and when exhaling, the exhaust gas is prevented from entering the oxygen storage bag. There are also several breathers on the mask. The stomata and single flap allow the patient to expel exhaust gas into the air when exhaling and prevent air from entering the mask when inhaling. Therefore, the inhaled oxygen of this oxygen mask can reach more than 90%.