The Vanderbilt exoskeleton, marketed as Indego,^[1][2] is a powered exoskeleton designed by the Center for Intelligent Mechatronics at Vanderbilt University in the U.S. state of Tennessee.^[3][4] It is intended to assist paraplegics, stroke victims and other paralyzed or semi-paralyzed people to walk independently.^[5] Motion and control technologies manufacturer Parker Hannifin is funding further development, and plans to release the first commercial version of the exoskeleton in 2015.^[6][7]

In 2012, there were estimated to be over 270,000 Americans with long-term spinal cord injuries, of whom around 21 percent suffer from complete paraplegia.^[8] The lifetime cost of care and lost productivity for each paraplegic ranges from US$1.4 million to $2.2 million.^[8] However, since the late 2000s, robotics and battery technology have become sufficiently advanced to make wearable walking assistance devices viable.^[9][10]

The Vanderbilt exoskeleton weighs 27 pounds (12 kg) and can support users weighing up to 200 pounds (91 kg).^[3][4] It is strapped to the user's legs, and uses an onboard computer to detect the user's movements, which are then supported and amplified by battery-powered motors in the exoskeleton's hip and knee joints.^[5] It also uses functional electrical stimulation to enervate the muscles of paralyzed patients, improving their strength and circulation,^[11] and can be quickly disassembled for removal.^[12] It can be used interchangeably with a wheelchair, and can be donned without assistance, allowing disabled individuals significantly greater independence.^[5] It is compact enough for a person to sit in a normal chair without needing to remove the exoskeleton.^[12]

Vanderbilt University began testing its exoskeleton with paraplegics and medical experts at a rehabilitation center in Atlanta, Georgia, in 2010.^[12] In October 2012, Parker Hannifin signed an exclusive licensing agreement with Vanderbilt University for the right to develop and manufacture a commercial version of the exoskeleton, which it plans to release under the name Indego.^[6][1] Whereas current commercial exoskeletons can cost as much as $140,000, Parker Hannifin hopes to exploit its manufacturing capabilities and the Vanderbilt model's lightweight design to ensure that the Indego is significantly cheaper.^[5] In March 2014, Parker Hannifin entered into clinical trial agreements for the exoskeleton with several major medical rehabilitation centres.^[7] In December 2014, Parker Hannifin invested in Freedom Innovations, a California-based prosthetic technology company with which it had a pre-existing partnership, to further the development of Indego.^[13] Following regulatory approval, Parker Hannifin plans to release Indego in Europe in 2015 and in the United States in 2016.^[7]

• Ekso Bionics
• Hybrid Assistive Limb
• ReWalk

• Center for Intelligent Mechatronics
• Indego Exoskeleton via Parker Hannifin website
• 2012 YouTube video of the exoskeleton in action