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Students Create Thought-Controlled Prosthetic Arm

Posted by timothy on from the only-the-good-thoughts-I-hope dept.

Zothecula writes "Two undergraduate students from Toronto's Ryerson University have created a prosthetic arm that is controlled by its wearer's brain signals, and powered by compressed air. Not only is the Artificial Muscle-Operated (AMO) Arm said to offer a greater range of movement than traditional prostheses, but it also doesn't require the amputee to undergo invasive surgery, is easy to learn to use, and it is relatively inexpensive to make."

27 of 50 comments (clear)

  1. Looks great by MichaelSmith · · Score: 4, Insightful

    The article discusses other projects they are looking at. Artificial lungs and way of bypassing spinal cord injuries. Its the sort of pragmatic engineering we should see more of in medicine. I hope they can deliver.

    --
    http://michaelsmith.id.au
    1. Re:Looks great by MoeDumb · · Score: 1

      Classic out-of-the-box thinking went into this. Hope it goes commercial big time, to the benefit of many.

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      Mod Me Up. You'll make a grown man cry.
    2. Re:Looks great by Anonymous Coward · · Score: 1

      I'm a bio-electrical engineer from MIT, and have done a dozen years of work in the field. This is a classic lab demonstration of a concept that fails in practice. I've worked with such sensory-neural prostheses, and it *does not work* for delicate control of anything. You can't reliably measure such signals: you can make gross measurements from skin or subcutaneous electrodes, but it's like trying to steer your car by aiming a firehose at the steereing wheel You can actually manipulate it and turn the car left or right, but it's very slow, a very noisy signal, and likely to be overwhelmed by other factors. Even the Boston Arm, which used skin electrodes on the muscles of the shoulder over 20 years ago and worked reasonably well as a mechanical device, had a half second phase lag between the desire to move, the signal being detected as relevant by the controls, and moving the arm.

      And don't say "we'll just analyze the signals with a computer!!!" This is not helped by fancy digital analysis: it's a basic signal/noise problem, and there is no solution with external electrodes or measurement. You have to get at the nerves themselves, and actually measure the signals far more precisely than is usually done, to get anything like quick or refined control of the system. This sort of thing has also been tried, repeatedly, for military aircraft to reduce the phase lag for pilots in combat having to send signals to their muscles to guide the plane. It never worked there, either.

      Now, with all that said, it's interesting that they made the arm pneumatic. Reducing the cost and reducing some of the electrical dangers of a significantly strong mechanical arm is an interesting project, and I hope it works out for them. One real test is how much the arm can lift. The Boston Arm could lift 12 ounces easily. (I asked the design engineer why and how he tested it, and he pointed out that it was to lift a beer. So I laughed and bought him one.)

  2. How long before this repaces keybord/mouse by nzac · · Score: 2

    It can't be too much longer before you can get the cost down to the point high end users can afford it.

    If they can make the learning fast enough and distinguish between different letters then sometime in the next 20 years you will be buying a cap with your tablet or other mobile device.

    1. Re:How long before this repaces keybord/mouse by Shikaku · · Score: 1, Funny

      No "the stranger" jokes yet? I thought someone might do this because of the enabling technology. See this if you don't know what it is.

    2. Re:How long before this repaces keybord/mouse by nzac · · Score: 2

      While I see zero feedback as issue for these kinds of devices I don't see the 'the strangers' relevance to IO input.

      My thinking is if you could for the easy case input hex by selectively contacting four fingers of one hand and turn the motor function of the hand of with a switch. You could also expand this to ternary input by using contacting and extending allowing full ASCII.

      I do see a lot of risk to confusing the brain about normal mussel use if not done properly.

    3. Re:How long before this repaces keybord/mouse by andrea.sartori · · Score: 3, Funny

      I do see a lot of risk to confusing the brain about normal mussel use if not done properly.

      These hate-fueled, misleading claims made by oyster producer shills must be stopped! Mussel is a perfectly healty and safe food!!!1

      --
      Mostly harmless.
    4. Re:How long before this repaces keybord/mouse by dominious · · Score: 1

      this scenario is highly possible when two undergraduates build a robotic arm:
      http://www.youtube.com/watch?v=r-VJLz65QhM

    5. Re:How long before this repaces keybord/mouse by maugle · · Score: 1

      My thinking is if you could for the easy case input hex by selectively contacting four fingers of one hand and turn the motor function of the hand of with a switch. You could also expand this to ternary input by using contacting and extending allowing full ASCII.

      I think Google beat you to that idea

    6. Re:How long before this repaces keybord/mouse by nzac · · Score: 1

      I'm sure the idea is not new its more a proof of concept (for me) that it could work.

      You have it wrong, i am saying that it could be possible in the next couple of decades to use a cap to read brain waves not a camera. The camera requires a lot of space. If this was to work you could type full speed (with a lot of practice) on the subway, (hopefully not driving) a car....

  3. I'm not sure about this. by Tigger's+Pet · · Score: 2, Interesting

    I would all depend on what level of the thought process they have it operating. Would the user have to actively think "I'll move it up, down, away, towards etc", in which case it would be less intuitive and easy than the nerve- or muscle-controlled ones. If the arm was set to just work on 'impulse' type thoughts, then how long before peoples arms start grabbing women by the arse just coz the user had a dirty thought - would they be able to be held responsible in law for the action of their arm?
    As for the Canadians doing this, well done. DARPA have been working on this for a long time now;-
    http://www.neurotechreports.com/pages/darpaprosthetics.html
    http://singularityhub.com/2010/08/03/mind-controlled-artificial-arm-begins-the-first-human-testing/

    1. Re:I'm not sure about this. by kinuso+kid · · Score: 1

      What they have done is quite different than the DARPA project in that it does not involve surgery. Like older prosthetics, it just slips on over the stump. You wear a head band to control it and yes, you think "up", "down" etc to move it. In the video I saw of it a user got it to operate with very little training.

  4. What? by a_hanso · · Score: 3, Funny

    No "CANADIAN students create thought controlled prosthetic arm"?

    Disclaimer: Big fan of Canada. I'm joking and I'm drunk.

  5. Dodgy article by EdZ · · Score: 3, Informative
    Hard to tell whether this is anything new or not when the article makes such glaring errors as:

    While some traditional prosthetic arms move via myoelectric motors and relays

    Myoelectrics involves sensing muscle movements by the electric fields generated, and is nothing to do with a type of electric motor. I doubt if anyone has used a relay in a prosthetic limb for at least a decade.
    If they really just using an EEG headband to control the arm, it's going to have very low controlled dexterity, and extremely slow response.

    1. Re:Dodgy article by VolciMaster · · Score: 2

      Hard to tell whether this is anything new or not when the article makes such glaring errors as:

      While some traditional prosthetic arms move via myoelectric motors and relays

      Myoelectrics involves sensing muscle movements by the electric fields generated, and is nothing to do with a type of electric motor. I doubt if anyone has used a relay in a prosthetic limb for at least a decade. .

      So it's not a "glaring error" at all - if they were used previously, then likely many of those devices are still in operation, so it's a true statement.

      --
      antipaucity
    2. Re:Dodgy article by EdZ · · Score: 1

      It's in the same vein as saying "many previous computers worked using DC hard-discs and inter-meshing gears". One is total nonsense, the other is so outdated as to be irrelevant.

    3. Re:Dodgy article by jfengel · · Score: 1

      It's the reason I don't mind the April Fools Day jokes. News in the tech industry is actually pretty slow. Minor advances get blown up into big news. It's hard even to tell from this article exactly how much is novel and how much of it is just "Hey, we're students and we put together existing technologies in the hopes that after we graduate we're going to build something genuinely world-changing."

      Of interest to the nerds, I suppose, especially those not actually in the field who are interested in something close to the state of the art. So it may be "stuff that matters", but it's not exactly "news" for nerds. This story could come out next week or next month or next year and probably be just as timely.

    4. Re:Dodgy article by Dr+Caleb · · Score: 1

      Feel free to watch the Global News story on it to answer some of your questions.

      http://www.channels.com/feeds/show/1205/Global-National-Vital-Signs-Video-Podcast

      --
      "History doesn't repeat itself, but it does rhyme." Mark Twain
  6. A joke, right? by grouchyDude · · Score: 1

    This is not serious or credible. Building prosthetic devices is a serious challenge with a lot of ergonomic issues. This project and the reportage like some kids building a lego robot and expecting it to revolutionize the automobile industry. Great, they controlled some simple pneumatic with an alpha wave reader: yawn.

    How about Dean Kamen's TED talk as a reference point for what's really needed and where this game is at: http://www.ted.com/talks/dean_kamen_previews_a_new_prosthetic_arm.html

  7. Go Gadget Go! by King+InuYasha · · Score: 1

    This reminds me of the Inspector Gadget movie, where the prosthetic foot is controlled by the will of the user...

  8. Pffft, that's nothing by BradleyUffner · · Score: 1

    My parents created 2 pair of BIOLOGICAL thought controlled arms over 30 years ago!

  9. Sounds like the 3-armed monkey by Woogiemonger · · Score: 2

    In this TED talk: http://www.ted.com/talks/paul_root_wolpe_it_s_time_to_question_bio_engineering.html ... the speaker details an experiment where they had a robotic arm respond to the brain signals a monkey has when it moves one of its arms. The monkey realized intuitively how it's controlled and eventually was able to move the arm without moving its real arm, effectively giving the monkey three working arms. Might've been an ape -- I forget.

  10. Crowdsource control over the arm! by selfevident · · Score: 1

    You know it's the only way this cheesy sf-horror premise gets any good.

  11. Sounds useful but... by presidenteloco · · Score: 1

    Could it be used to control this? http://gmail.com/motion

    --

    Where are we going and why are we in a handbasket?
  12. Does it respond to voice commands? by mfnickster · · Score: 1

    Like "raise my left arm" or "throw the harpoon"? People are going to come from all over... this boy's an Eskimo!

    --
    "Slow down, Cowboy! It has been 3 years, 7 months and 26 days since you last successfully posted a comment."
  13. Didn't RTFA by Massachusettensis · · Score: 1

    Didn't even RTFS. Just the subject had me rolling, remembering the tale of a VOICE controlled prosthetic arm. It's #392, in case you haven't hear it.

  14. Whoops! by sycodon · · Score: 1

    It's made in Canada. The FDA will never approve it.

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    When Fascism comes to America, it will call itself Anti-Fascism, and tell you to give up your guns.