Intravenous cannula

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Close-up of cannula over needle

An intravenous cannula is a medical device designed to dwell in a vein as a means of administering intravenous drugs and fluids. They are essential in venous access:

Several design variations exist, but most are based on the cannula-over-needle design. In this, the needle is used to puncture the vein and position the cannula, after which the needle is removed, leaving only the plastic cannula in situ. Other design variations:

  • plastic wings
  • presence of a top port

Proprietary names for intravenous cannula include Abbocath™, Venflon™ and Optiva™.

Unused cannula with needle and cap in place
Cannula with partially withdrawn needle
Cannula by itself
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