MARLBOROUGH, Massachusetts (Susan Kimball/Portland Press Herald) -- Brian Walker sits in a chair at New England Rehabilitation Hospital in Portland as Lauren Peltier checks the small backpack strapped above his waist. He's wearing a Red Sox cap – brim backward – and a sleeveless T-shirt that shows off his Superman tattoo.
The backpack contains the batteries that power the motorized braces on his legs. Peltier, who works for ReWalk Robotics in Marlborough, Massachusetts, hands him a pair of crutches. Brian, 40, is about to demonstrate the company's robotic exoskeleton – the "ReWalk" – for the first time in Maine.