Soft and 3D-printed micromachines, Sia Lab, Columbia University, New York, USA

A micromachine made from squishy hydrogel clicks forward as a magnet (the dark disc below) drives a component with embedded iron nanoparticles (small black curved piece). With each click, one of six chambers lines up with a hole, so the dose of chemo drug inside the chamber can be released.
From the lab of Samuel Sia, professor of biomedical engineering at Columbia University. Video by Sau Yin Chin.

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