There is a lot going on open source and 3d printed prosthetics. Some of this projects could be enhanced using some measurements as to find optimization or enhancements.
Also, there are open source projects for insulin pumps and there the microcontroller part could play a bigger role.
I would recommend looking at something open source because it is easier to start, but once you are more familiar with the domain, you can look at propietary devices and see how to enhance them
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