Jan 6 2011
The scientists at the Arizona State University are creating a new kind of robotic ankle prosthesis that replicates natural movement of the real ankle. The robotic ankle called SPARKy, (spring ankle with regenerative kinetics) is funded by the US Army.
The SPARKy features a motor with low power, a uniquely designed spring and a robotic tendon. When the user walks with SPARKy, the robotic tendon expands the spring as the leg or shaft of the prosthesis rotates over the ankle. This expansion produces a tiny quantity of energy, which is stacked in the motor. As the heel elevates, the energy is discharged, which in turn pushes the foot forward.
The scientists are still working on the design enhancement of the robotic ankle. They expect to introduce it in to the market by 2011. Thomas Sugar, an inventor and scientist at the Arizona State University, commented that the SPARKy consumes less energy than a conventional lower limb prosthesis. The scientists have examined the robotic ankle for climbing or descending stairs and walking. The patients’ response for the product was overwhelming.
Source: http://www.asu.edu