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Monday, May 19, 2008

Upgrading the Prosthetic Hand

Continued from page 1

By Kate Baggott

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One patient is currently wearing the Fluidhand to complete daily tasks, and a second is about to be fitted for the device. Some 250 people, including soldiers wounded in Afghanistan and Iraq, already use i-LIMB.

Stuart Mead, CEO of Touch Bionics, points out that the comparative study in Heidelberg is not a competitive one. "Many people have many different devices for different activities, and what works for one patient may not work for another," he says.

Comparative studies of this nature do have value for determining how well the device can meet amputees' needs. "They are probably testing each device's strength, power, and versatility," says Herr. "The prosthetics have to be able to pick up something very lightweight and fragile, like a piece of china, as well as something large and heavy."

Soon, people requiring a prosthetic hand with movable digits will have more options. "The German-Austrian company OttoBock will probably present a new hand with movable fingers in 2009," says Schulz.

Experts expect this rapid development in the field of prosthetic technologies to continue into the near future.

"I believe that there is a big push into wearable exoskeletons because the mechatronic technology has matured, becoming more cost effective, miniaturized, and powerful," says Thomas Sugar of Arizona State University, who works in robotic prosthetics. "Batteries and motors are smaller and more powerful. Microprocessors have been very fast and cheap. Lastly, I do think there has been a big push by NIH [National Institutes of Health] and the DOD [Department of Defense] into medical robots for stroke therapy, powered exoskeletons, and powered prosthetics."

The Biomechatronics Group's Herr agrees. "Typically, when you plot prosthetic innovations against time, you see a spike in innovation after every war, and that is certainly true today," he says. "In addition, we're also seeing a number of disciplines such as robotics, mechanical engineering, and biomechatronics mature to the point [where] we can merge to create truly remarkable systems."

There is still room for those remarkable innovations in prosthetic development.

"We find ourselves, as an industry, working to manage people's expectations," says Touch Bionics' Mead. "A prosthetic doesn't function like a real hand. We're still only able to replicate 5 to 10 percent of what a real hand can do."


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Comments

  • Exciting
    Shiladie on 05/19/2008 at 9:22 AM
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    4/5
    There are some fields of breakthroughs that I simply find much more thrilling to hear about.  This is one of them, mostly because it has immediate, as well as long term, effects on people's lives.  it seems we are on the edge of where these prosthetics function better then the human original, and all it will take is them improving a bit more over the next few years and coming down in price before I can see products for people without disability.  Upgrades if you will.
    Rate this comment: 12345
  • Is it just me...
    Monsterboy on 05/19/2008 at 9:53 AM
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    62
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    4/5
    ...or did the paragraph on the move to wearable exoskeletons near the end seem like a sudden shift to an article in The Onion?
    Rate this comment: 12345
  • Additional Comment
    kbaggott on 05/26/2008 at 2:25 PM
    Posts:
    1
    Yes, technical terms often sound like something out of the Onion. And yet, there is no other word accurate enough to describe the direction prosthetic devices are going in.

    But, these devices are about people, not about vocabulary and so, I would like to add the comments of Karen Valley, Director, National Amputee Centre for the War Amps. The War Amps is a Canadian charity that outfits both war and child amputees with prosthetic devices. Valley describes herself as a "below the elbow amputee." She uses the iLimb and her comments came in after my deadline on this piece.

    Some valuable points:

    "The advancement in upper limb prosthetics is long overdue, and I am certainly interested in what new devices are available.  Having been fitted with a myo-electric early after they hit the common market, I am also somewhat reluctant to jump into anything new, for several reasons.

    "The cost of the iLimb is very high and therefore out of reach to the average client.  Hopefully these costs will come down and be more accessible.

    "The original myo-electrics were very heavy and the current models are lighter in weight and easier on the body.  I hope that the new model has not sacrificed weight for function.

    "There were many bugs to be found in my first few years as a myo-electric user," Valley says. "I am thrilled that technology is starting to catch up to the needs of upper limb amputees.  If the above concerns can be addressed, this new device would be of great benefit to the daily life of an arm amputee."

    For more information see http://www.waramps.ca
    Rate this comment: 12345
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