Butterfly needles

Butterfly needles, also known as winged infusion sets, are a very common needle style used to collect blood during a venipuncture. The butterfly needle consists of the stainless steel collection needle fitted with flexible "wings," which the phlebotomist uses to grip the needle, and a valve that attaches to a tube, through which blood drawn flows into a collection tube. Butterfly needles are popular because of their ease-of-use, and their size makes them an optimal choice for drawing blood from children or geriatric patients.