I think for the first time I'm seriously thinking about designs for simple wetware implants.
Essentially just a simple disc about the size of a nickel with a magnet and small coil embedded inside, with a couple small electrodes on the surface. The idea is that you can magnetically attach a controller, which means you have the ability to easily modify/upgrade the controller -- you could even use a very low energy micro controller to create a multiplexed array of electrodes
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