The iBOT: Inside Dean Kamen's mission to revolutionize the wheelchair

Before the Segway made him famous, inventor Dean Kamen had already spent decades revolutionizing medical devices: infusion pumps, insulin pumps, stents, dialysis machines. Kamen's boldest idea, though, was the one he was really working on when he repurposed a few of its core engineering advances to create the stripped-down, recreational Segway. It was a far more advanced — and potentially life-altering — all-terrain electric wheelchair known as the iBOT. In celebration of Global Accessibility Awareness Day, Yahoo News presents an in-depth oral history of the mobility device now in its second, even more ambitious entry into the marketplace.

Listen to an audio-described version of the video.