According to the team, it was a real challenge making the brace lighter and more wearable. Their main tester said the current version's "comfortable enough to wear for long periods," though, so it sounds like they succeeded. They also managed to add a system that converts energy into electricity that goes straight into storage -- a lithium-ion battery, to be specific -- at the beginning of 2015.

As you might have guessed, it's not exactly capable of powering implantable medical devices yet. But the Farmers are hoping that future iterations will be able to wirelessly transmit electricity to artificial hearts.