• These legs were made for walking

    Wearable robot can help patients stroll again
  • RALEIGH, N.C. — A team of physical therapists strapped the robot onto him, one hit a button and with a faint electronic whir, and David Ayscue was suddenly 6 feet tall again.
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  • RALEIGH, N.C. — A team of physical therapists strapped the robot onto him, one hit a button and with a faint electronic whir, and David Ayscue was suddenly 6 feet tall again.
    Then Ayscue took a step, and a different future came just a little bit closer for him and millions of others who can't walk on their own.
    "I guess this is how a baby feels taking its first steps," he said. "I can't describe it. It's just overwhelming."
    Ayscue, 56, was learning how to use a new robotic exoskeleton called an Ekso. The state Department of Transportation maintenance worker suffered a spinal cord injury on the job while cutting up a dead tree two-and-a-half years ago.
    The device that he was wearing is an outgrowth of Pentagon-sponsored research into robotic devices to help soldiers carry heavy loads. The civilian model was developed to help people who use wheelchairs to stand and walk again.
    WakeMed's rehabilitation hospital is the first in the Carolinas and one of just 16 in the country to get the device since it went on the market in February, said Eythor Bender, CEO of Ekso Bionics, based near San Francisco.
    For now, the Ekso is an aid for physical therapy clinics with the help of therapists trained in its use, but the company is working on a sleeker, cheaper model for home use, which it hopes to begin selling in two years.
    WakeMed began using the device this week. Initially the hospital is using it on patients with spinal cord injuries who can't walk on their own, but it plans to eventually use it on other kinds of cases, such as stroke patients.
    Elsewhere, the device is already used for patients with other health problems, including multiple sclerosis, amyotrophic lateral sclerosis (Lou Gehrig's disease) and traumatic brain injuries.
    For patients who spend significant amounts of time in wheelchairs, being able to spend at least a little time in the device regularly is likely to offer improvements in a host of functions, such as circulation, respiration and digestion, said Cathy Smith, director of outpatient rehabilitation at WakeMed.
    It may help those with partial spinal cord injuries regain some function more easily.
    Harder to quantify are intangible benefits, such as what it means for someone who has been in a wheelchair for decades to simply to be able to stand, walk around and look people in the eye again.
    The Ekso looks like a kind of mechanized, computerized combination of a backpack and leg braces. Patients wear it with straps below the knees, on the thighs, around the stomach and over the shoulders. Plates under each foot are attached to motors and lift up. More than two dozen sensors feed information into the Ekso's computer, which uses it to decide how and when to step.
    Patients must have at least some upper body strength to use Ekso because they must use a walker or crutches when wearing the device to ensure their balance. For the current model, they also must be lighter than 220 pounds and between 5 feet 2 inches and 6 feet 2 inches in height.
    The device has three modes. In the most advanced, fully automatic mode, the device takes a step when the patient shifts his weight to the side and leans forward.
    They have to work up to that, though. In the most basic mode, therapists talk the patient through the proper motions, and one of them uses a hand — held remote control to trigger each step.
    In an intermediate mode, the patient triggers each step via a button on one crutch.
    Ayscue was still in the first mode Thursday, and all the patients using it will be for a while as they and the WakeMed therapists learn how to use it.
    Eventually he will transition to trigger his own steps with buttons on one crutch.
    The batteries last about three hours, but can be quickly swapped out for fresh ones.
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