Ponca City, We Love You writes "Physiatrist Todd A. Kuiken, M.D., Ph.D. has pioneered a technique known as targeted muscle reinnervation (TMR), that allows a prosthetic arm to respond directly to the brain's signals, allowing wearers to open and close their artificial hands and bend and straighten their artificial elbows nearly as naturally as their own arms. Doctors first perform nerve transfer surgery to redirect nerves that go to the amputated arm to the patient's chest muscles. Then when the chest muscle contracts, an electromyogram picks up the electrical signal to move the prosthetic arm. So when the patient thinks 'close hand,"' the hand closes. Now the team wants to see if they can extract more information from the electrical signals produced by the nerves to provide a greater number of hand and arm movements. Theyd have been able to identify unique EMG patterns with 95% accuracy for 16 different elbow, wrist, hand, thumb, and finger movements. 'We've been able to demonstrate remarkable control of artificial limbs and it's an exciting neural machine interface that provides a lot of hope,' says Dr. Kuiken."
I saw on TV news 2-3 years ago a prostetic arm used by a Scottish hotellier, which claimed to be thought-driven and gave him enough dexterity and strength to pull a pint.
In all seriousness, it wouldn't be necessarily something you would have to do to get a keyboard/mouse interface with the brain. The brain has been shown to be very adaptable and you could probaly keep your own appendages and still have the ability to interface with the computer.
Of course, I'd donate a kidney (or two) to be the first to have this done.
Obviously I'm not a neurosurgeon. I look forward to posts from the experts.
But what is the difference between the electrical signals from the nerves and those given off by contracting muscles? Since the nerves which carry the signals are known, why can't those nerve signals be read straight away? Is it a case of much easier signal patterns to identify with the electrical signals of muscles or just a question of signal strength or something much more complicated?
Interesting as well that they should say that when the muscles are touched, for the patient is seems like the prosthetic arm is touched. Too bad they don't mention the perceived sensitivity to temperature and pressure with this effect. Put sensors on the tip of the hand and a little device on his chest and you might give the patient movement and "feeling" as well.
From what I understand, the communication with nerves not only have to be bi-directional but also we arn't sure what other signals are sent (chemical, etc). We can detect the messages to muscles as those are VERY simple and only require small electrical detectors. Decoding a straight nerve seems still seems beyond our reach.
Mind you, this is much better than before. Previous robotic arms are built this same way, but it takes months and months of training to use your chest muscles to move your arm. Now it looks like you don't need that much therapy since they rout your arm nerves to your chest.
PS - I am no expert, I just looked into it a bit ago when I met someone with a claw hand.
There is some research being done into bidirectional prosthetics. Kevin Warwick from Reading University in the UK has successfully implanted a chip in his own arm allowing him to control an external robotic arm and receive sensory input from it.
Some of Warwick's work is pretty controversial (see e.g. various articles from The Register [theregister.co.uk]), but he does do some solid research.
The signals in the nerve can be detected directly, but the are very small, and it is harder to get a micro-electrode array in the nerve. The muscle acts like a bio-amplifier, so that the small impulses from the nerve are measured as larger electro-myographic signals (EMG). I am a neural engineer on f the team at the Univ. of Utah that is working on using the signals in the nerve directly. We can already decode the movement signals from the nerve directly and are investigating how to provide sensory feedb
I'm not quite sure, but I think that electrical signals from the nerves are much more difficult to record due to the size of the nerves. An EMG, for example, is relatively easy if you stick an electrode into any part of the target muscle. I'm not really sure about the patient "feeling" the arm; there should be a lot in the literature about patients who think they can feel sensation through their implant, but it's often because of the other nerves around the implant or prosthetic, and not the implant itself.
The nerves in the body are usually buried somewhat deep, and are insulated usually by a layer of fat, and by their insulation(fatty Schwann cells). Since the nerves innervate the muscles, the signal becomes amplified, thus making it much easier to pick up the signal (stronger, and just under the skin, not insulated).
Another reason is that many different nerve fibers run together in a nerve, especially up in the brachial plexus (shoulder are). If this prosthesis is meant for people who have lost their are high up, then the nerves in this location, are somewhat big (between a pencil and strand of linguinni thickness), and contain many different fibers. There are about 30 different muscles in the forearm/hand, and another 20 in the shoulder and arm (and don't forget all the sensory fibers too). It might be just too hard to pick out usable signals from that mess, If some of the fibers are re-routed to a superficial muscle (chest wall pectoralis major), then it's much easier for the person to choose discrete movements, and have control over the prosthesis.
I am an orthopaedic surgeon, so I'm just posting this part to squelch any criticism about the facts above.
The war in Iraq has created a 'market' for prostetic limbs. Given that the latest and most advanced of these are being tested on such veterans, do you think anyone is considering fielding combat cyborgs any time in the future? Go to Iraq, get an arm blown off, go back 6 months later with a submachine gun for a hand...
The war in Iraq has created a 'market' for prostetic limbs. Given that the latest and most advanced of these are being tested on such veterans, do you think anyone is considering fielding combat cyborgs any time in the future? Go to Iraq, get an arm blown off, go back 6 months later with a submachine gun for a hand...
Been watching too much scifi, fellow geek?:)
Actually, they already have guys going back into the military with the current prosthetics. There was one guy missing a foot who's even back in combat.
The way I see it, we're probably not going to be seeing ginchy-keen combat prosthetics like in scifi, your submachinegun hand for example. The person will have a limb that's tough, durable, fit for the civilian world, and can also hold a weapon. Right now, a cyborg would be at a disadvantage versus an intact oppon
Go to Iraq, get an arm blown off, go back 6 months later with a submachine gun for a hand...
Certain brands of sci-fi are fond of this (and others--anybody else remember Kujiranami Hyougo, who did this bit in Rurouni Kenshin?), but in fact it's not gonna happen in real life. A gun for a hand is terribly limiting--all you can do is shoot people with it. A reasonable facsimile of an actual hand is vastly more versatile. Wnat to shoot somebody? Pick up a gun and shoot him. Or pick up a hammer and drive a n
Actually, thats an even more disturbing thought that robotroops. Medical companies financing a war so they get lots of maimed soldiers to experiment on.
The reason it occured to me, is that the US currently has a bit of a shortage of troops in Iraq, and certainly faces one going into Iran. Getting an arm or leg blown off is currently a permanant ticket home. I'm sure they would love to be able to strap on a replacement limb and send the poor buggar back out there to get blown up some more.
I'm sure (medical companies) would love to... send the poor buggar[sic] back out there to get blown up some more.
Regardless of one's politics, don't you think it's an outrageous and indefensible statement to suggest that a company (or individual for that matter) would take pleasure in seeing a soldier injured?
don't you think it's an outrageous and indefensible statement to
suggest that a company (or individual for that matter) would take
pleasure in seeing a soldier injured?
You mean like insurance companies who award bonuses based on number
of policies dropped to avoid big payouts?
Or, let's get blunt here, how about manufacturers of military hardware?
They exist for the purpose of maiming and killing soldiers - Sure,
soldiers on the "other" side (as though that magically excuses atrocities
against humanity)
I don't think its outrageous to suggest big corporations can see potential profits in everything, especially ones already making a killing (pun intended) from warfare.
Quirks and Quarks [www.cbc.ca] covered this a couple of weeks ago in a pretty good interview. You can find the show here [www.cbc.ca] (in mp3 and ogg =).
I'm not seeing the obvious "Thought Controled Artificial Penis" jokes yet. Just think how embarrassing it would be to have something like that activating around your friend's hot mom/wife/sister, at work, in the grocery line...
This brings to mind another Red Dwarf episode, the one where Kryten gets a prosthetic penis. Unfortunately it gets away from him, setting up the joke "My penis has a mind of its own!"
Simple motions of a prosthetic device can be accomplished with this approach, but they will always rely on visual feedback. The problem is that it is too slow for more complicated movements, such as delicately grabbing objects of different stiffnesses. As long as no proprioceptive feedback is given to the brain, electromechanical prosthetics will remain cumbersome.
"Shock the Monkey" might make a handy comeback... Call it the "ShoThMo Model 1". Why, with the things we could create, and append to the body, it might give a new meaning to "bi-onics"...
i propose the term Psionics for mind controlled machines (attached or not). Avionics are electronics for aviation, psionics could be electronics related to the brain. Given that only D&D nerds would know of the word having any other use, we could replace the awkward phrases "mind controlled" and "mind machine interface".
Lots of geeks here, very few neurosurgeons. So on the whole the informed comment ratio is going to be way, way down on this article. Doesn't mean people don't take limb loss seriously for a nano-second.
Justin. PS Just read your sig. Don't you think that could be offensive? Got the idea yet?
You win the award for the most random post for the day. Congratulations! A prize will be deposited into your bank account once you post your bank's name, you login and password to access your bank account online.
That is correct. Some people are too busy being tech geeks to be anime geeks. And some people are too busy being emo to be either. I'm somewhere in between (and I didn't get the reference).
I hope you can understand why it's wrong to do something like that. But... if you're going to do it anyway can you also make me a miniature horse with it's back legs replaced by wheels?
I want one ... (Score:1)
And as a bonus... (Score:4, Funny)
We will make him stronger... faster... (Score:1)
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Um... Jax from Mortal Kombat?
Old News? (Score:2)
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An alternative (Score:2, Funny)
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lose hand, computer ++ (Score:3, Funny)
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Of course, I'd donate a kidney (or two) to be the first to have this done.
nerve signals / muscle signals (Score:3, Interesting)
But what is the difference between the electrical signals from the nerves and those given off by contracting muscles? Since the nerves which carry the signals are known, why can't those nerve signals be read straight away? Is it a case of much easier signal patterns to identify with the electrical signals of muscles or just a question of signal strength or something much more complicated?
Interesting as well that they should say that when the muscles are touched, for the patient is seems like the prosthetic arm is touched. Too bad they don't mention the perceived sensitivity to temperature and pressure with this effect. Put sensors on the tip of the hand and a little device on his chest and you might give the patient movement and "feeling" as well.
Re:nerve signals / muscle signals (Score:5, Interesting)
Mind you, this is much better than before. Previous robotic arms are built this same way, but it takes months and months of training to use your chest muscles to move your arm. Now it looks like you don't need that much therapy since they rout your arm nerves to your chest.
PS - I am no expert, I just looked into it a bit ago when I met someone with a claw hand.
Parent
Re:nerve signals / muscle signals (Score:4, Informative)
There is some research being done into bidirectional prosthetics. Kevin Warwick from Reading University in the UK has successfully implanted a chip in his own arm allowing him to control an external robotic arm and receive sensory input from it.
Some of Warwick's work is pretty controversial (see e.g. various articles from The Register [theregister.co.uk]), but he does do some solid research.
Wikipedia has more details [wikipedia.org]
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Decoding the signals from nerves does sound very interesting though, I wonder what parity settings they use?
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I'm not really sure about the patient "feeling" the arm; there should be a lot in the literature about patients who think they can feel sensation through their implant, but it's often because of the other nerves around the implant or prosthetic, and not the implant itself.
T
Muscle vs Nerve signals (Score:4, Informative)
Another reason is that many different nerve fibers run together in a nerve, especially up in the brachial plexus (shoulder are). If this prosthesis is meant for people who have lost their are high up, then the nerves in this location, are somewhat big (between a pencil and strand of linguinni thickness), and contain many different fibers. There are about 30 different muscles in the forearm/hand, and another 20 in the shoulder and arm (and don't forget all the sensory fibers too). It might be just too hard to pick out usable signals from that mess, If some of the fibers are re-routed to a superficial muscle (chest wall pectoralis major), then it's much easier for the person to choose discrete movements, and have control over the prosthesis.
I am an orthopaedic surgeon, so I'm just posting this part to squelch any criticism about the facts above.
Parent
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Semi-serious thought... (Score:3, Interesting)
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Square Enix would sue [wikipedia.org].
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The war in Iraq has created a 'market' for prostetic limbs. Given that the latest and most advanced of these are being tested on such veterans, do you think anyone is considering fielding combat cyborgs any time in the future? Go to Iraq, get an arm blown off, go back 6 months later with a submachine gun for a hand...
Been watching too much scifi, fellow geek? :)
Actually, they already have guys going back into the military with the current prosthetics. There was one guy missing a foot who's even back in combat.
The way I see it, we're probably not going to be seeing ginchy-keen combat prosthetics like in scifi, your submachinegun hand for example. The person will have a limb that's tough, durable, fit for the civilian world, and can also hold a weapon. Right now, a cyborg would be at a disadvantage versus an intact oppon
Re: (Score:2)
Certain brands of sci-fi are fond of this (and others--anybody else remember Kujiranami Hyougo, who did this bit in Rurouni Kenshin?), but in fact it's not gonna happen in real life. A gun for a hand is terribly limiting--all you can do is shoot people with it. A reasonable facsimile of an actual hand is vastly more versatile. Wnat to shoot somebody? Pick up a gun and shoot him. Or pick up a hammer and drive a n
Re: (Score:3, Insightful)
Actually, thats an even more disturbing thought that robotroops. Medical companies financing a war so they get lots of maimed soldiers to experiment on.
The reason it occured to me, is that the US currently has a bit of a shortage of troops in Iraq, and certainly faces one going into Iran. Getting an arm or leg blown off is currently a permanant ticket home. I'm sure they would love to be able to strap on a replacement limb and send the poor buggar back out there to get blown up some more.
Re: (Score:2)
Regardless of one's politics, don't you think it's an outrageous and indefensible statement to suggest that a company (or individual for that matter) would take pleasure in seeing a soldier injured?
Re: (Score:2)
Re: (Score:2)
You mean like insurance companies who award bonuses based on number of policies dropped to avoid big payouts?
Or, let's get blunt here, how about manufacturers of military hardware? They exist for the purpose of maiming and killing soldiers - Sure, soldiers on the "other" side (as though that magically excuses atrocities against humanity)
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Covered on Radio (Score:2, Informative)
Very Dissapointed With Slashdot (Score:2)
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Feedback (Score:2, Interesting)
In soviet Russia ... (Score:2)
Might be hard to pilot an AT with it, but... (Score:2)
(OK, will anybody at all get this one??)
So, Peter Gabriel's song... (Score:2)
Licensed by Microsoft? (Score:2)
hnad, tyep psot on Slasdoth.
hnad, teyp tosp no lSadhost.
Dear aunt, let's set so double the killer delete select all
i propose the term Psionics (Score:2, Interesting)
Re:Ok now for a non stupid post (Score:4, Funny)
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Laugh, they were jokes. I don't think the guy making the crack about trading his arm for a USB cable really meant it.
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Lots of geeks here, very few neurosurgeons. So on the whole the informed comment ratio is going to be way, way down on this article. Doesn't mean people don't take limb loss seriously for a nano-second.
Justin.
PS Just read your sig. Don't you think that could be offensive? Got the idea yet?
You win (Score:3, Funny)
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-2 nobody here gets it? =(
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