West Point cadets create bionic foot as capstone project

Sgt. 1st Class Patrick King is experimenting with a bionic foot created by Cadets Ian Jones, Sarah Goss, Joe Marshall and Jonathan Kralick as a capstone project in the West Point Academy's Civil and Mechanical Engineering Department.
King lost his foot in Iraq to an explosively formed projectile, a weapon that can go through armored trucks. "We as Soldiers would rather have the improvised explosive devices hit than an EFP," King said. "Those are really dangerous."
The cadets are designing, building and testing a below-the-knee active prosthesis to replicate the foot-ankle movement of a natural foot. The project was assigned in October. Fellow seniors Bryan Bird, Mark Evinger, Hang Li and Maher Mnassri were also members of the bionic foot team.
The cadets worked on the design,  then gathered materials and manufactured pieces. Screws and brass nuts were bought from outside vendors. The project took about six months to complete.
"At this point, the foot does need electricity and to be plugged into a computer," Marshall said. "We are trying to reduce the components so amputees are able to walk. At some point, (an amputee) can use a small portable system."
King is the first to try the bionic foot, which he heard about through a prosthetic technician at Walter Reed Army Medical Center. He decided he would like to help with the project, if not for himself then for someone else.
"This is the first year of a multiyear project," Lt. Col. Joe Hitt, assistant professor in the CME department. and faculty advisor, said. "This project will culminate with a walk-run device that Soldiers can use in and out of the field."
Hitt said the system will be tested by three military amputees as part of approved clinical trials.
"The goal is to improve the Soldiers' metabolic efficiency and produce a more symmetric and comfortable gait compared to wearing a conventional, passive prosthesis," he explained.
King tried the foot on a treadmill.
"It’s light enough and I can feel the ankle and the side-to-side movement," he said. "I'm not used to that; having that freedom."
The cadets noticed a certain amount of wobbling and took the foot back to the fabricating area to readjust it.
"It is a challenge," Jones said. "Everything is so tightly compacted that it makes it hard to get to everything, like the screws."
King said he enjoys being part of the team and is willing to do whatever he can to help.
"I would love my foot back, but I can deal with it," he said. "If I can help another person down the road, that will be great."