Plural of canula; small flexible tubes inserted into blood vessels or body cavities to deliver medicine or fluids.
From Latin 'canna' (reed or tube) + diminutive suffix '-ula'. The term evolved in medical contexts during the 17th century to describe thin hollow instruments.
Canulas are everywhere in hospitals—they're so common that most patients don't realize how revolutionary they were! Before canulas, doctors had to make larger, more painful incisions to deliver medications directly into the body.
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