A device that can be integrated into prosthetic hands capitalizes on phantom sensations to enable users to sense hot and cold.
A new device makes it possible for a person with an amputation to sense temperature with a prosthetic hand. The technology is a step toward prosthetic limbs that restore a full range of senses, improving both their usefulness and acceptance by those who wear them.
The device also improved Fabrizio’s ability to tell whether he was touching an artificial or human arm. His accuracy was 80 percent with the device turned on, compared with 60 percent with it off. “It’s not quite as good as with the intact hand, probably because we’re not giving skin textures,” says neuroengineer Solaiman Shokur of EPFL, the Swiss Federal Institute of Technology in Lausanne.). But the ability to detect temperature has lagged behind.
In the new study, Shokur, Muheim and colleagues first mapped Fabrizio’s phantom temperature sensations to match a spot on his arm to the corresponding sensation in the index finger of his missing hand. They then attached a temperature sensor to the fingertip of his prosthetic hand, which was connected via a controller unit to a device on Fabrizio’s arm that delivered appropriate temperature signals.
The speed at which the device relays temperature may become an issue when combining multiple senses. Osborn and colleagues
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