Blunt needle filling injection starting needle insertion technique

The initial needle was quickly inserted into the subcutaneous tissue of the epidermis at an Angle of 30° to 45°, consistent with the expected direction of the blunt needle approach. Too shallow penetration cannot fully Pierce the skin, making it more difficult for blunt needles to enter horizontally. At the same time, a blunt needle inserted through a shallow or smaller entrance can cause more pain than a hypodermic needle pierced through the skin at once. Penetrating too deep can cause unnecessary tissue damage and aggravate the bruising that the injectors wish to avoid. The needle is held at the puncture site for a few seconds to form clotting and allow enough time for the needle to create a temporary passage that can easily enter the tissue.