The very thought of needles makes many squeamish, but scientists from the Seoul National University in South Korea hope to alleviate those fears by replacing the sharp metal with laser-powered injections. As described in a paper published in the Optical Society’s Optics Letters journal , the system uses laser pulses to create a precisely controlled stream about the width of a human hair. The resulting injections target the epidermal layer — a portion of the skin that has no nerve endings — to create what researcher Jack Yoh calls a “completely pain-free” experience. The high-pressure streams are able to inject drugs without damaging skin tissue, similar to the needle-free technology being created by researchers at MIT. Speaking with..

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Scientists developing lasers to replace needles for ‘completely pain-free’ injections

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