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Driving a Wheelchair with Your Shirt

November 21st, 2006 Josh Umbehr Rehab

Researchers Fishbach and Mussa-Ivaldi at Northwestern University’s Department of Physical Medicine and Rehabilitation have developed a high-tech fabric which promises to help wheelchair bound patients.

Adaptive, sensor-laden garments could provide a new way for quadriplegics to control their wheelchairs. The system, which is still in an early stage of development, identifies the ideal set of movements that can be employed as control commands for each individual user. “We think this will benefit the most difficult patients, such as those who can move only their head or shoulders,” says Alon Fishbach, a scientist at Northwestern who is among those developing the device.
People with high-level spinal-cord injuries often lose control of their hands, but they may still be able to move their shoulders or chests. More and more such patients survive their injuries, thanks to respiratory devices that help them breathe. But these people have limited options when selecting devices to control their wheelchairs or computers. They might use a sip/puff switch, which converts the user’s sip or puff of air into a specific command, or a headswitch, which records head movements via a switch on the back of the wheelchair. “But the disadvantage of these devices is that patients must fit the capacities of the machine, rather than the other way around,” says Ferdinando Mussa-Ivaldi, another Northwestern scientist working on the device. “If a patient can move their right side more than their left, an intelligent interface could pick up on this.”
To overcome this design flaw, the researchers are developing an adaptive device using sensor-laden fabric. The garment is printed with 52 flexible, piezoresistive sensors developed at the University of Pisa. These sensors are made of electroactive polymers that change voltage depending on the angle at which they are stretched. The sensors can detect fine scale movements of the upper body and arms.
The researchers are currently focusing on a system to control wheelchairs, but they say the device could be used to control a wide range of machines.

The article at MIT Tech Review. . .

Josh Umbehr

Josh Umbehr, MD founded AtlasMD Concierge Family Practice, one of the fastest growing insurance-free practices in the country. Currently developing an industry leading platform for direct primary care physicians: Atlas EMR Software for Concierge Medicine.

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