What is the primary purpose of a barrier device during rescue breathing?

The primary purpose of a barrier device during rescue breathing is indeed to protect the rescuer and patient from diseases. This device acts as a physical barrier between the rescuer and the victim, significantly reducing the risk of transmitting infectious diseases through respiratory droplets or contact with bodily fluids. By utilizing a barrier device, the rescuer can perform life-saving breaths without direct mouth-to-mouth contact, ensuring both their safety and that of the victim during a critical emergency.

While other options may seem relevant in the context of rescue breathing, their primary focus does not align with the primary purpose of the barrier device. Providing effective oxygenation, ensuring a proper seal, or increasing oxygen volume are important aspects of rescue breathing techniques, but these are secondary considerations concerning the barrier itself. The main objective is to minimize health risks, making the correct answer centered on protection from potential transmission of diseases.