Butterfly needles, which are 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.
This article explains what is Butterfly Needles, when and how to use it. Also tell you about the advantages and disadvantages of it.