LMA detail primary and secondary seal

Primary and Secondary Seal

Bound superiorly by the epiglottis and inferiorly by the junction between the glottic inlet and oesophagus, the laryngopharynx typically contains the bulk of the LMA mask. The mask’s bowl aligns with the laryngeal inlet, while the lateral aspects of the cuff abut the pyriform fossa forming an airtight seal. This seal is called the primary seal. The distal cuff tip should occupy the entire hypopharynx forming an oesophageal seal to protect the laryngeal inlet from aspiration from below. This oesophageal seal is also known as the secondary seal.