Researchers at the University of Michigan and Delft University of Technology in the Netherlands have created a prosthesis that makes walking much easier on amputees than current options. The trick: an artificial foot that recycles the kinetic energy generated by walking.
The device, detailed Wednesday in the journal PLoS One, works by mimicking the natural push-off of a human ankle, using a microprocessor to control the device and capture the energy normally dissipated by the leg:
In tests on subjects walking with an artificially impaired ankle, a conventional prosthesis reduced ankle push-off work and increased net metabolic energy expenditure by 23 percent compared to normal walking. Energy recycling restored ankle push-off to normal and reduced the net metabolic energy penalty to 14 percent.
That means less cumbersome dragging of an artificial limb and a more natural walking sensation. It also only requires a small battery to operate, running off of less than 1 watt of power.
It's just a prototype for now, but assuming the current round of testing goes well, there's no reason not to expect a commercial application in the not-too-distant future.
This story originally appeared on Gizmodo.