What is the primary function of a barrier device during ventilations?

The primary function of a barrier device during ventilations is to maintain a seal between the rescuer and patient. This is essential in ensuring that the air delivered to the patient effectively reaches their lungs without significant leakage. A proper seal helps optimize the ventilation process, which is crucial in emergency situations requiring resuscitation or assisted breathing. By creating this barrier, the device allows for safer and more efficient airflow, protecting both the rescuer from potential exposure to pathogens and the patient from ineffective ventilations.

While comfort and oxygen delivery are important considerations in emergency care, they are not the primary focus of a barrier device. Additionally, preventing airflow from escaping is a secondary benefit of maintaining an appropriate seal rather than the main reason for using the device.