SCIENTISTS DEVISE WAY FOR DISABLED TO CONTROL COMPUTERS & WHEELCHAIRS BY SNIFFING
Author Unkown, contributed by a Beineinu Parent
Individuals who are severely disabled, including those “locked into” their bodies as a result of accidents or disease, may soon have a new way to communicate and move around, according to Israeli scientists.
By sniffing in and out through their noses, more than a dozen quadriplegics were able to control computers that allowed them to guide a wheelchair, the team reported in the Proceedings of the National Academy of Sciences.
The technology relies on the fact that quadriplegics and others retain control of their soft palettes, which regulate breathing through the nose. Even people who are not able to breathe on their own can control the new device by blocking and releasing the flow of air forced through their noses by a pump.
The technology “may provide a host of viable solutions for the growing population of individuals who are severely disabled,” the team wrote.
The device ”is pretty ingenious in giving people who can’t control their environment another way to do that,” said Dr. Adam Stein, chair of physical medicine and rehabilitation at North Shore-Long Island Jewish Health System in Great Neck, NY.
It would be particularly valuable for people who have locked-in syndrome, in which they can do little more that flutter an eye, he said. For many other patients, however, alternatives exist, including controlling devices through a breathing tube or with their tongue.
The mechanism is actually relatively simple. Small tubes inserted in the nose monitors sniffs and exhalations, allowing the user to control a computer. To control a wheelchair, for example, two short sniffs signal “forward”, which two short exhalations signal “back”. An exhale followed by a sniff signals “left”, while a sniff followed by an exhale signals “right”. Similar protocols move a cursor on a computer screen for writing.
Neurologist Noam Sobel of the Weizmann Institute of Science in Tel Aviv and his colleagues initially studied the device in 96 healthy people, demonstrating that they could control the movement of a cursor as easily as they could with a joystick or mouse. However, about one in four could not work the device properly.
The researchers then tested the device with a 51 year old woman who had suffered a stroke seven months earlier; she could not mover her limbs and was unable to control eye blinks, the most common means of communication in such patients. After training her how to control her breaths, they presented her with a writing device that she began using immediately, “initially answering questions, and after a few days she generated her first post-stroke meaningful self initiated communication that entailed a profound personal message to her family.”
They next tested the device with a 42 year old man who had been locked in for 18 years after a car accident. He had attempted to use an eye-tracker to communicate in the past, but stopped because he “did not like it.” The new device, he said, was “more comfortable and more easy to use.”
The device did not work on the third patient, however, a 64 year old man who had suffered a stroke four years earlier. The man was severely depressed, and the researchers could not determine “whether this failure reflected a genuine inability or rather disinterest.”
The team then installed the device on a wheelchair and demonstrated, first with healthy people, then with the disabled, that it could be used to navigate a 150 foot obstacle course with sharp turns and other impediments.
Overall, the device has now been tested successfully in 15 severely disabled patients. The Weizman Institute has filed for a patent on the technology used in the device and hopes to find a marketing partner.