What does a laryngeal mask provide?

sorry, I was cut off. LMA's maintain patency of the airway but also allow inhalational anesthetics to be administered.

Have never seen the word "patency" before. Have no idea what it means.

Olly, If I had known the meaning before, I would have chosen the right answer according to the picture

Olly, not a word I was familiar with either. Related to some meanings of patent: clear, plain, unobstructed.

I wonder what "patency" means?