French semiconductor lab Leti has used deep etching to created micro injection needles for Swiss firm Debiotech. The idea is to allow injections without pain, with the final injecting short enough (720μm high, 220μm diameter) not to contact nerves (see photo of model). Construction involves etching 80μm diameter holes 800μm deep from the back of ...
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from Electronics Weekly https://www.electronicsweekly.com/news/design/silicon-needle-injects-drugs-without-pain-2017-07/
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