Fenestrated inner cannulas for the BLUselect tracheostomy tube are designed with openings to allow airflow to pass through the upper airway, facilitating speech while the tube is in place. These inner cannulas are used with fenestrated BLUselect outer cannulas and are crucial for patients who need to speak while maintaining a tracheostomy. 

Purpose:
Fenestrated inner cannulas are primarily used to enable speech by allowing air to pass through the fenestrations (holes) in the outer cannula and up towards the vocal cords.