1) In the previous design reviews, our allergy stamp adopts a pressing mechanism. The doctor would place the allergy stamp onto the skin surface and then press down to apply the allergens. One of our classmate, Ian, had expressed a concern that the skin surface might bend in when the micro needles went down too slowly. We decided to adopt the pull and shoot mechanism, where the doctor would pull the micro needles and release to shoot them into the skin. The damping ratio as well as the spring constant must calibrated so that the spring would not bounce up and down on the skin.
2) Since the unused position of the inner plunger is in the downward position, so we also introduced a bottom cover so that the stamp can stay clean when not used.
Pictures for prototype:
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