Trocars are used during laparoscopic procedures and other minimally invasive surgery (MIS) to make small, puncture like incisions in outer tissue layers. These incisions allow surgeons to insert cannulas through which surgical instruments can be introduced.
The tubes illustrated are designed for removing small amounts of secretions from the nose, throat or ears. They are made of glass and are fitted to a suction pump. Near the angle the glass is blown into a bulb into which the secretion will run.
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.

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