Laryngeal mask cuff

A laryngeal mask airway (LMA) device comprising:

• a single-layer inflatable annular cuff, which is insertable through a mouth of a patient to an inserted location within the patient, such that an anterior side of the cuff forms a seal around a laryngeal inlet of the patient upon inflation of the cuff;
• a backplate attached to the cuff;
• and
• an airway tube having (a) a proximal end that is configured to be disposed outside the patient's mouth when the cuff is at the inserted location, and (b) a distal end that is in fluid communication with a port of the backplate, wherein the port is open through a hollow center of the annular cuff,
• wherein the cuff, when disposed in free space, is characterized by a pressure-volume curve that represents the pressure in the cuff when inflated to different volumes of the cuff that include a low-pressure volume corresponding to a low pressure of 10 cm H2O, wherein the pressure-volume curve includes:
• a local maximum pressure at a medium volume of the cuff between 1.25 and 2.4 times the low-pressure volume, wherein the local maximum pressure is between 15 and 120 cm H2O, and
• respective high-volume medium pressures corresponding to all high volumes of the cuff that are between 2.5 and 3 times the low-pressure volume, wherein each of the high-volume medium pressures is between 15 cm H2O and 99% of the local maximum pressure.