Scientists Hook Neural Interface to Powered Exoskeleton


A team of scientists has connected a robotic exoskeleton to a neural interface so that a patient who has lost their foot and lower leg can control the powered system with their thoughts.

By combining the robotic prosthesis with sensors that could sense the signals sent from the man's brain to the foot, the system allowed a far greater range of motion and more control than exoskeletons normally can, according to a study published earlier this month in Wearable Technologies magazine. IEEE Spectrum said it took a lot of physical therapy to get the patient to a point where they could control the technology with their mind. However, this is a major improvement in the drive to give humans complete control over new robot limbs.

"This stability and subtle control while standing was quite surprising," the senior study author and biomedical engineer from North Carolina State University told IEEE Spectrum.

Typically, robotic exoskeletons come preprogrammed with movements such as walking to help the wearer get around. However, by handing the keys to the actual person, a multitude of new movements suddenly became possible.

"Autonomous control works very well when walking," NC State study co-author and biomedical engineer Helen Huang told IEEE Spectrum Control. "

In this case, the man with the prosthetic leg could sit down by himself and stand up and squat to lift something off the floor. Throughout the experiment, he showed far greater mobility and control than someone wearing a typical exoskeleton.

In the future, the team plans to test the technology on more volunteers and also find out what is going on internally so that the nervous system can actually control the robotic leg.

"Are you restoring your original nerve pathways?" Huang said about IEEE Spectrum.

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