What type of needle is described as having a butterfly shape and is used for small or fragile veins?

The needle described as having a butterfly shape and used for small or fragile veins is indeed a winged infusion set. This type of needle is specifically designed for easier insertion into small or delicate veins, making it ideal for patients such as pediatrics or those with difficult venous access.

The wings on the sides of the needle provide a secure grip, allowing healthcare providers to stabilize the needle during insertion and while drawing blood or administering medication, reducing the risk of accidental dislodgment. The butterfly design allows for a more precise angle of insertion, which can be particularly beneficial in fragile veins that could easily collapse.

This design, along with its ability to be attached to a syringe or tubing for IV access, enhances its usability in various clinical settings. The option describing the straight needle refers to a standard needle without the added stabilization features. The tabbed infusion needle is incorrect because it typically does not refer to a butterfly or winged design, and the Vacutainer needle is specifically designed for use with evacuated blood collection tubes, lacking the wings that distinguish the winged infusion set.