artificialhand
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Prosthetic hand restores a man's sense of touch
DARPA promised prosthetic limbs that produce realistic sensations, and it's making good on its word. The agency's researchers have successfully tested an artificial hand that gave a man a "near-natural" level of touch. The patient could tell when scientists were pressing against specific fingers, even when they tried to 'trick' the man by touching two digits at once. The key was to augment the thought-controlled hand with a set of pressure-sensitive torque motors wired directly to the brain -- any time the hand touched something, it sent electrical signals that felt much like flesh-and-bone contact.
Super-precise artificial hand uses smart wires as muscles
As a rule, bionic hands are clunky contraptions made of motors, pneumatics and other machinery that just can't be as elegant as the real thing. Germany's Saarland University might just change that, however. Its researchers have developed an artificial hand that uses smart nitinol (nickel titanium) wires as its muscles. All you do to make them flex is heat them up or cool them down -- the metal 'remembers' its original shape before you bend it, so you don't need bulky equipment to move it back and forth. The wire bundles are as thin as cotton, but they're very strong and can move with much more precision and speed than usual. They don't even need sensors, since electrical resistance in the wires themselves is enough.
