A butterfly needle is a device used to access a vein for drawing blood or giving medications. Some medical professionals call a butterfly needle a “winged infusion set” or a “scalp vein set.” ...

Research from 2016 suggests that butterfly needles may greatly reduce the risk of blood vessel damage during a blood draw. However, it’s important to note that bruising and other complications ...

People who know they have smaller veins may want to request the use of a butterfly needle during a blood draw. This is a short, straight, very thin hollow needle that can be helpful, according to ...