Gentle on people and gentle on the pocket book.
Taking cues from the 40,000 muscles and unique agility of
an Elephant's trunk,
Fraunhofer Institute for Manufacturing Engineering and Automation in
Stuttgart has developed the
ISELLA prosthetic arm.
Two motors per joint help prevent undesired motion and an interesting
drive system uses a high-strength cord wrapped around a double helix
drive shaft. It's claimed that the drive system is more
a typical geared setup, has a high strength-to-weight ratio, and is more
cost-effective to manufacture.