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Cannula
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<p>A cannula is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of samples. In simple terms, a cannula can surround the inner or outer surfaces of a <a href="/facts/Trocar/oJ0hf1f6">trocar</a> needle thus extending the effective needle length by at least half the length of the original needle. Its size mainly ranges from 14 to 26 <a href="/facts/Needle_gauge_comparison_chart/xla9Qf0U">gauge</a>. Different-sized cannula have different colours as coded. </p><p>Decannulation is the permanent removal of a cannula (<a href="/facts/Intubation/R8ltvGLT">extubation</a>), especially of a <a href="/facts/Tracheostomy/wV3NCaly">tracheostomy</a> cannula, once a <a href="/facts/Physician/qJ3woFvG">physician</a> determines it is no longer needed for breathing. </p>