What is the angle of insertion for a winged infusion set (butterfly)?

What is the angle of insertion for a winged infusion set (butterfly)?

• A. 10 degrees
• B. 15 degrees
• C. 20 degrees
• D. 25 degrees

Answer: (B)

For successful venipuncture with a winged infusion set, the insertion angle should be shallow and controlled to enter the vein with minimal tissue disruption. About 15 degrees is used because it allows the needle tip to reach the lumen of a superficial vein smoothly, reducing the risk of penetrating through the back wall and causing extra trauma. This modest angle also helps the bevel enter the vein cleanly and makes it easier to see a flash of blood before advancing the catheter a short distance. If the angle is too steep, you risk puncturing through the vein or causing more trauma; if it’s too shallow or inconsistent, you may have difficulty entering the vein at all.

For successful venipuncture with a winged infusion set, the insertion angle should be shallow and controlled to enter the vein with minimal tissue disruption. About 15 degrees is used because it allows the needle tip to reach the lumen of a superficial vein smoothly, reducing the risk of penetrating through the back wall and causing extra trauma. This modest angle also helps the bevel enter the vein cleanly and makes it easier to see a flash of blood before advancing the catheter a short distance. If the angle is too steep, you risk puncturing through the vein or causing more trauma; if it’s too shallow or inconsistent, you may have difficulty entering the vein at all.