JIM VARNEY / SCIENCE PHOTO LIBRARY JIM VARNEY / SCIENCE PHOTO LIBRARY
Anaesthetising a patient. Anaesthetist inserting a cannula into the back of a patient's hand prior to surgery to remove a cancerous kidney. A cannula is a combination of a hollow needle with a tube inside. The needle enables the tube to be inserted into a patient's vein. Once inserted, the needle is removed leaving the tube in place. This allows liquid drugs to be fed directly into the patient's blood stream through the tube.
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