Bionic Suit Offers Wearers Super-Strength

A robot suit has been developed that could help older people or those with disabilities to walk or lift heavy objects. Dubbed HAL, or hybrid assistive limb, the latest versions of the suit were unveiled in June at the 2005 World Expo in Aichi, Japan.

HAL is the result of 10 years work by Yoshiyuki Sankai of the University of Tsukuba in Japan and integrates mechanics, electronics, bionics and robotics in a new field known as cybernics. The most fully developed prototype, HAL 3, is a motor-driven metal “exoskeleton” that the user strap onto their legs to power-assist leg movements. A backpack holds a computer with a wireless network connection, and the batteries are on a belt.
 
Two control systems interact to help the wearer stand, walk and climb stairs. A “bio-cybernic” system uses bioelectric sensors attached to the skin on the legs to monitor signals transmitted from the brain to the muscles. It can do this because when someone intends to stand or walk, the nerve signal to the muscles generates a detectable electric current on the skin’s surface. These currents are picked up by the sensors and sent to the computer, which translates the nerve signals into signals of its own for controlling electric motors at the hips and knees of the exoskeleton. It takes a fraction of a second for the motors to respond accordingly, and in fact they respond fractionally faster to the original signal from the brain than the wearer’s muscles do. “The motors respond faster to signals from the wearer’s brain than their own muscles” 

The HAL 4 and HAL 5 prototypes, which were demonstrated at Expo 2005, don’t just help a person to walk. They have an upper part to assist the arms, and will help a person lift up to 17 pounds more than they can manage unaided. The new HALs will also eliminate the need for a backpack. Instead, the computer and wireless connection have been shrunk to fit in a pouch attached to the suit’s belt. HAL 5 also has smaller motor housings, making the suit much less bulky around the hips and knees.
 
HAL 3 weighs 10 pounds, but the help it gives the user is more than enough to compensate for this. “It’s like riding on a robot, rather than wearing one,” says Sankai. He adds that HAL 4 will weigh 8 pounds, and he hopes HAL 5 may be lighter still.
 
Sankai has had many requests for the devices from people with brain and spinal injuries, so he is planning to extend the suit’s applications to include medical rehabilitation. The first commercial suits are likely to cost between $14,000 to $19,000 USD.
 
Source: New Scientist magazine