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Researchers Have Developed A New Device For Administering Vaccines. The Device Utilizes Electrically Ignited Gun Powder To Generate Pressure That Pushes The Device To Relatively Painlessly, Compared To Needles, Penetrate A Person’s Skin, Sending The Vaccine Through Tiny Apertures. The Device Would Also Be Safer For Health Care Workers.

Scientists devise way to painlessly inject vaccines without needles : The Asahi Shimbun

http://www.asahi.com/ajw/articles/14239922

SUITA, Osaka Prefecture–A researcher holds up a blue plastic medical device, resembling a crafting