Bacterial / Viral filters are to be used as part of the airway and ventilation circuit. They are designed to filter bacterial and viral pathogens before expired air is vented to atmosphere. Use bacterial filters in conjunction with Clinical Skills 206 (Bag Valve Mask), 306 (Supraglottic Airway Device), and 307 (Endotracheal Intubation). The bacterial filter must be applied prior to the first ventilation. Do NOT use in children under 20kg.
If there is a basic airway approach where the mask is utilised, the filter must be applied between the bag and mask. An effective seal around the nose/mouth must be maintained at all times to limit air leakage. A second person can ventilate the patient if needed.
If there is an advanced adjunct in place (i-gel®/LMA/ETT), then the filter MUST be applied directly to that adjunct before any other equipment. The end-tidal is shown here between the bag-valve and the catheter mount (Cobb’s adapter). It may be placed between the filter and the catheter mount if preferred.
Take care when disassembling and disposing of the filter and the associated airway circuit. It must be disposed in Clinical Waste bin.