Skin layers and needles: MedlinePlus Medical Encyclopedia Image
small syringe with needle in the skin Stock Photo - Alamy
Injex Needle Free Injector - The lightweight and easy to use Injex Needle Free Injector delivers insulin into the tissue under the skin without a needle. Gently. Safely. And, just as effectively
Immune Cells May Be Stronger in Skin Than in Blood, Needle-less Vaccines the Future?
Butterfly Needle for Blood Draw: How It Works and Why It's Used