Sponsored by Anita Mandal, M.D. Question: I’ve heard of a few doctors using cannulas for injection of fillers instead of needles. What are the benefits of cannulas and do they hurt more than needles?

A cannula is a thin tube that doctors insert into a person’s body cavity, such as their nose, or into a vein. Doctors use them to drain fluid, administer medication, or provide oxygen. A person can ...

Extrusion cannula An extrusion cannula has been used extensively for drainage of subretinal fluid by posterior segment surgeons. The flexible sleeve of the extrusion cannula helps to reach the ...