What is it? Hyperinflation is the act of causing or assisting in the act of inflating the patients lungs when breathing assistance is required Resuscitating. Function: The Mercury Medical Hyperinflation System consists of: - Hyperinflation Bag - Face Mask -- Optional Manometer to measure airway pressure - Optional Pressure relief valve (pop-off) - Main Feature: The Mercury Medical Hyperinflation Bag with optional built-in Manometer and optional Pressure Relief Valve offers a clinical breakthrough by providing a device for controlled or assisted ventilation while simultaneously monitoring pressure.