What does cannula mean?
A cannula is a slender tube, usually made of plastic or metal, that is inserted into the body to give clinicians access to veins, cavities, airways, or tissues without major surgery. In everyday hospital care, the term most often refers to the short plastic tube left in a patient's vein for administering medications and fluids, or to the small pronged device worn under the nose to supply oxygen. Cannulas are equally central to modern surgery: they serve as entry ports through which cameras, needles, and other instruments are guided during minimally invasive procedures such as laparoscopy and liposuction. The word derives from the Latin 'cannula', meaning 'little reed', a diminutive of 'canna', the same root that produced 'cannon', 'canal', and 'channel'. Because it is a purely technical term, it appears almost exclusively in medical, veterinary, and laboratory settings, where precision of placement and gauge matters greatly to patient safety.
nounA thin, flexible tube inserted into the body, typically into a vein, body cavity, or airway, to deliver or remove fluids, administer medication, or allow access for surgical instruments.
- Medicine: a thin tube inserted into a vein, duct, cavity, or airway to administer or withdraw fluids, deliver drugs, or provide access for instruments.
- Surgery: a blunt-tipped sleeve or guide through which sharper instruments or needles are passed during minimally invasive procedures.
"The nurse inserted a nasal cannula to deliver supplemental oxygen while the patient slept."
"An intravenous cannula was placed in her forearm so the antibiotics could be administered around the clock."
"During the laparoscopy, the surgeon introduced the camera through a cannula in the abdominal wall."
'Cannulas' is the standard plural in contemporary medical English; the classical plural 'cannulae' occasionally appears in older or highly formal texts.
"The nurses stocked the trolley with sterile cannulas of several different gauges."
The same Latin root that gave surgeons the cannula also gave armies the cannon and Italy its pasta tubes — it all began with a humble reed.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cannula
The word 'cannula' comes directly from Latin 'cannula', a diminutive of 'canna', meaning 'reed' or 'cane' — a small reed being an apt image for a narrow hollow tube. It entered English via New Latin in medical usage, becoming established by the early seventeenth century as anatomical and surgical vocabulary expanded. Its Latin root has proven remarkably productive: 'canna' also underlies 'canal' and 'channel' through Latin 'canalis', and reached English again through Italian as both 'cannon' (a large tube of war) and 'cannoli' (a pastry tube). The verb 'cannulate' and the noun 'cannulation', describing the act of inserting a cannula, developed later within clinical English.
Related word forms
How cannula is actually used
Strictly clinical and technical in register; rarely used outside healthcare contexts. Plural is 'cannulas' in general medical writing, though the Latinate 'cannulae' appears in some formal or specialist texts.
Easily confused with cannula
A cannula is a thin medical tube inserted into the body, whereas a cannoli is an Italian pastry tube filled with sweet ricotta — though both descend from Latin canna, 'reed'.
The terms overlap in clinical use, but a catheter specifically drains fluids from the body, while a cannula more broadly provides access for delivering substances or inserting instruments.