What does "3 and 4-mm cannulas" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
A cannula is a thin tube that doctors use to either remove or deliver fluid to the body, often during surgery. The "3 and 4-mm" part refers to the diameter of these tubes, meaning they are 3 and 4 millimeters wide. So, "3 and 4-mm cannulas" are simply small tubes of these specific sizes that are used in medical procedures.
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