Sheathed needles function by incorporating a safety mechanism that either retracts the needle into the device or covers it with a protective sheath once the injection is complete. There are several types of sheathed needles, including:
Retractable needles: The needle retracts into the syringe barrel or a plastic housing after use. Needle guards: A plastic or metal guard covers the needle after it is withdrawn from the patient. Blunt-tip needles: The needle tip becomes blunt after use, preventing it from puncturing the skin again.
