A skin patch could soon provide efficient pain relief whenever you flex sore muscles. The system would work by synchronising the release of drugs with movement of the underlying inflamed tissue. Unyong Jeong's team at Yonsei University in Seoul, South Korea, covered a flexible rubber film with a sheet of corrugated microporous polystyrene, with gutters around 3 micrometres wide and 1 micrometre deep. The gutters were then filled with a liquid and sealed with another rubber film. (source: newscientist.com)
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