Definition
Definition
Small tube made of plastic, metal, sometimes rubber, allowing the passage of air or liquid through an orifice, whether natural or obtained after surgery.
Generalities
A cannula is either rigid or flexible, straight or curved, but of variable length and caliber depending on the use. There are several types of cannula:
The tracheostomy tube is either permanent and in this case made of silver or used episodically and in this case is made of rubber. The silver tracheostomy tube is likely to remain in place for several years in patients suffering from chronic respiratory failure, among other things. The Mayo cannula or Guedel cannula is a flattened cannula that allows air to pass through the trachea after its introduction into the patient's mouth in individuals with a coma. It helps prevent suffocation by the tongue falling backward.