30 posts categorized "Bionics"

12/26/2012

2012: Science Fiction Dreams That Came True

Science-fiction-622

As a longtime reader of science fiction, it's always interesting to see how the visions of writers eventually become real. Take Arthur C. Clarke's letter to Wireless World in 1945, which details the geostationary communications satellite network everyone uses today. The satellites are in what is called the "Clarke Orbit." And Isaac Asimov wrote frequently about humanoid robots, which are becoming more common in research labs -- although we have yet to see R. Daneel Olivaw from Asimov's Robot series.

So inspired by these writers and others, I decided to take a look at 2012 and the futuristic technologies that are materializing before our eyes.

ANALYSIS: Robot Prostitutes, the Future of Sex Tourism

Bionic Limbs
The term "cyborg" was coined in 1960 by Manfred E. Clynes and Nathan S. Kline, in an article they wrote for the journal Astronautics. Since then bionic limbs have been a trope in many pieces of fiction -– The Six Million Dollar Man of the 1970s, the Borg of the Star Trek franchise, and even Darth Vader. In 2012 for the first time, a paralyzed woman was able to control a robotic limb and feed herself directly with her brain. Continuing work with primates demonstrated that it's possible to make the brain-computer interface efficient enough to design more realistic movement into the limbs. The bionic limbs so far don't look anything like their fictional counterparts, as they are still connected via external electrodes to the skull. But that dream seems to be a lot closer than it was even a decade ago.

Quantum Teleportation and Communication
While it's not possible -- yet -- to "beam" an object around as in Star Trek, new records for zapping photons instantly from one place to another were set this year. Quantum teleportation has been done in the lab for some time, but the distances were on the order of a few yards. In 2012 the new record was 89 miles. In addition to teleporting, scientists built the first quantum Internet. It's only a beginning, but teleporting photons for miles would enable communications that can't be hacked or eavesdropped.

Genetic Disease Prevented
Genetic engineering for "better" humans is a theme that's appeared repeatedly ever since Aldous Huxley's Brave New World in 1931 -- although at that point nobody knew what DNA really was. Later, films such as Gattaca and novels such as Beggars in Spain explore the implications of widely available genetic alterations. In 2012, we saw a proof-of-concept for mitochondrial diseases. About one in 200 people are born with a disorder of the mitochondria, the energy factories of cells. For the first time scientists were able to transfer the nuclear DNA of one human egg cell to another. Two groups independently found a way to transplant nuclei between human egg cells, leaving behind the mitochondrial DNA, which is passed from mother to child. The finding means that mitochondrial disorders could be cured before a child is born. Such techniques won't cure something like Down's syndrome, which involves nuclear DNA. But it shows that some manipulation of the human genome is not only possible, but happening. 

ANALYSIS: Ray Bradbury's Visions

The Universal Translator
Most of the time when intrepid explorers in fiction meet aliens, they always seem to speak perfect English. Doctor Who's TARDIS generates a field that allows travelers to be understood, while the crew of the Enterprise never seem to need a dictionary. Kim Stanley Robonson's Mars Trilogy features one, but he didn't think it would appear until late in the 21st century (the novels were written in the 1990s). While they won't let you talk to aliens, in the last year several speech-to-speech translators have managed to reach real consumer devices -- and even one type that uses your own voice. Most of the apps require an internet connection, though some, such as Jibbigo, can store their dictionaries locally. (If they ever add Klingon I'm taking it to the next ComicCon).

Head-mounted Computer Glasses
Readers of Charles Stross' novel Accelerando would have eagerly anticipated Google Glasses -- the Internet giant's foray into augmented reality. In the novel, "venture altruist" Manfred Macx carries his data and his memories in a pair of glasses connected to the Internet. Google Glasses allow the wearer to access data, the Internet and capture life via a head-mounted digital camera. Memories will have to wait.

Private Space Flight
In many science fiction stories, space travel is private. In Ridley's Scott latest movie, Prometheus, the Weyland Corporation funds an expedition to follow a star map to the distant moon LV-223. In real life, Elon Musk's SpaceX launched the first of a dozen planned missions to the International Space Station. The Dragon capsule is designed to resupply the ISS, but Musk, who made his fortune as founder of PayPal, has bigger plans: a colony on Mars. Is 2013 going to be the year human spaceflight becomes an enterprise like railroads? We won't know that for a while, but SpaceX is a heck of a start.

This list isn't comprehensive, and it isn't meant to be the last word on anything; readers, if you think there's something I missed, please sound off in the comments!

Credit: Colin Anderson/Blend Images/Corbis




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09/07/2012

Cockroaches Strapped With Steering Wheels

Remote-roach-622

Finally, someone has designed a way to convert one of the world's biggest pests into something useful.

Using an electronic interface, a group of researchers from North Carolina State University have developed a method to steer and remotely control cockroaches. Rejoice.

BLOG: Brain in a Dish Flies Plane

"Our aim was to determine whether we could create a wireless biological interface with cockroaches, which are robust and able to infiltrate small spaces," Alper Bozkurt said, according to Physorg.com.

Bozkurt, an assistant professor of electrical engineering at NC State, was co-author of the project's paper, presented recently at the International Conference of the IEEE Engineering in Medicine and Biology Society in San Diego, Calif.

"Ultimately, we think this will allow us to create a mobile web of smart sensors that uses cockroaches to collect and transmit information, such as finding survivors in a building that's been destroyed by an earthquake," he said.

"Building small-scale robots that can perform in such uncertain, dynamic conditions is enormously difficult," Bozkurt added. "We decided to use biobotic cockroaches in place of robots, as designing robots at that scale is very challenging and cockroaches are experts at performing in such a hostile environment."

To do so, the researchers used a cheap, lightweight computer chip with a wireless receiver to transmit a signal to the roaches. Imagine the roaches strapped with a tiny backpack and you get the picture. The device weighs only 0.7 grams and includes a microcontroller that monitors the interface between implanted electrodes and tissue so the roach's nervous system doesn't fry.

BLOG: Mind-Controlled Drone Takes Off

The device is also wired to the cockroach's antennae and cerci, its sensory organs in the abdomen. The cerci detect movement in the air to detect predators and cause roaches to scurry. However, by using wires to stimulate the cerci, researchers were able to trick the roach into thinking something was sneaking up on it, thus causing it to move.

Wires attached to the antennae are essentially reins that feed small charges into the roach's neural tissue, which fool the roach into thinking there is something they need to steer clear of. In doing so, researchers were able to steer the roach along a curved line.

via PhysOrg




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08/28/2012

Cyborg Update: Living Tissue Grown on Nanowires

Mesh circuit

One of the staples of science fiction is embedding the human body with sensors, to merge humans and machines. That goal may be a bit closer.

A team of chemists and anesthesiologists has found a way to embed nanometer-scale wires into living tissue. When implanted into a body, the "cyborg" tissue could potentially sense and monitor medicine or inflammation and keep doctors aware of whether the transplant is working.

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The scientists started with a mesh of silicon wires coated in an organic polymer, each 30 to 80 nanometers in diameter. The mesh is three-dimensional, like a sponge, and can be bent into any shape. Next, the scientists seeded the mesh with living cells that were grown in a culture. The result was living cells with a three-dimensional mechanical support able to carry electrical signals. While two-dimensional scaffolds have been made before, those don't replicate what happens in the human body, where cells are in three-dimensional structures.

Thus far the team has engineered cyborg tissues using heart, muscle, blood vessel and nerve cells. The cells' viability and activity wasn't affected. The embedded sensory circuits were able to pick up electrical signals generated by the cells in response to drugs. In the case of the blood vessels, the circuits detected pH changes, which could be useful in tracking inflammation.

None of these pieces of tissue has been implanted into a human being yet; it will be some time before the technology gets to that point.

BLOG: Cyborg Cockroach Turned Into Fuel Cell

The team was led by Charles M. Lieber, a professor of chemistry at Harvard and Daniel Kohane, a Harvard Medical School anesthesiologist. Kohane developed the "scaffolds" for the cells. Other contributors were Robert Langer from the Massachusetts Institute of Technology, and Zhigang Suo, professor of mechanics and materials at Harvard. The work was published Aug. 26 in Nature Materials.

Credit: Charles M. Lieber and Daniel S. Kohane, MIT




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07/27/2012

'Iron Man' Exoskeletons Go Soft

Smart suit
Forget Iron Man armor and exoskeletons. They're so last year. This season, augmenting human strength has moved to stretchable, flexible suits.

The Defense Advanced Research Projects Agency has shelled out $2.6 million to Harvard's Wyss Institute of Biologically Inspired Engineering to build a "smart suit" that enhances the strength of soldiers in the field.

BLOG: Man Implants Magnets In Arm To Hold iPod

The amount of gear that the average trooper has to carry -- in addition to the body armor -- has gone up in the past few years. The modern soldier has a lot of sophisticated equipment now, but that stuff is also pretty heavy. So it's no surprise that the military is interested in boosting the amount of time that a person can carry all that stuff.

Thus far, most designs for exoskeletons, such as Raytheon's XOS, or the Human Universal Load Carrier, have relied on rigid struts and require a lot of power to operate. That's a big limiting factor -- a soldier wouldn't want to be on a long hike in Afghanistan and have the batteries run out. Also, the suits aren't (yet) as flexible and easy to use as a lot of military planners would like.

The Wyss Institute design takes a different approach. Instead of using rigid systems to simply boost strength, the smart suit relies on soft, stretchable sensors that detect fatigue. To help a person maintain their posture, the suit might give a small vibrations to soothe leg muscles, not unlike a massager. That would keep soldiers walking and moving longer.

 BLOG: Exoskeleton Helps Paralyzed Patients Walk

Being stretchable and soft  would make a big difference to the wearer, of course, as it would be a lot more comfortable (and not chafe). As important, it could be worn under a uniform.

The project is still in the early stages, so the details of which technologies will be brought to bear haven't been worked out yet. The DARPA funding will go to a team headed by Conor Walsh, assistant professor of mechanical and biomedical engineering at the Harvard School of Engineering and Applied Sciences.

via: Wyss Institute

Image: Wyss Institute



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06/27/2012

Fuel Cell Uses Brain Power

Brainimlantcell

The phrase, "use your brainpower" may soon become literal. Engineers at MIT have developed a tiny prototype fuel cell that creates electricy from the body's natural sugars.

The fuel cell could be used to power brain implants for treating epilepsy, Parkinson's diseases and paralysis. Currently, devices implanted in the body are typically powered by lithium-ion batteries, but they have a limited lifetime and need to be replaced. Opening up the body to replace a battery is not something doctor like to do, but doing it in the brain is even less desirable.

BLOG: Man Implants Magnets In Arm To Hold iPod

The researchers, led by Rahul Sarpeshkar, an associate professor of electrical engineering and computer science, built the fuel cell using a platinum catalyst at one end and a layer of carbon nanotubes at the other. It rests on a silicon chip, allowing it to be connected to electronics that would be used in brain implants.

As glucose passes over the platinum, electrons and hydrogen ions are stripped off as it is oxidized. That's what makes the current. At the other end of the cell, oxygen mixes with the hydrogen to make water when it hits the layer of single-walled carbon nanotubes. The cell produces up to 180 microwatts, enough to power a brain implant that might send signals to bypass damaged region, or stimulate part of the brain (a treatment used in disorders such as Parkinson's).

Glucose fuel cells are an old idea, dating to the 1970s, and a similar kind of fuel cell was proposed by French scientists in 2010 to power pacemakers. That cell was a mix of graphite and enzymes that separated the electrons from the glucose. The problem is that the enzyme-powered cells weren't able to run as long with as much output as lithium-ion batteries.

BLOG: Flexible Brain Implant Could Treat Epilepsy

MIT's cell will keep working as long as there is glucose and water. The glucose to power it would come from the cerebrospinal fluid that surrounds the brain. Much of the glucose there isn't used by the body, and the fuel cell only uses a small fraction of that, so it shouldn't affect brain function.

The cell hasn't yet been tested in an actual brain, just a solution that mimics the fluid around it. It is still a promising step towards implants, even though it will be years before anyone is walking around with one in their heads.

The team published their work in the June 12 edition of the journal PLoS ONE.

via MIT

Credit: MIT



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06/13/2012

Retinal Prosthesis Could Help The Blind See

Implant_closeup_300x258

A retinal implant has given a brief glimpse of light to a small number of blind people, and could one day be a common treatment for vision loss due to injury or disease.

Shawn Kelly, a senior systems scientist at Carnegie Mellon University, has developed a computer chip that translates camera images into electrical pulses that the nerves inside the brain can understand. The result is vision.

The cameras are incredibly small and mounted to a pair of glasses. The digital information picked up from the camera is sent along a wire to a thin film surgically implanted in the back of the patient's eye, between the sclera and the retina. The electrical signals stimulate the nerves in the retina, and that allows the patient to see. The system is powered via induction -- not much current is necessary since the electric field doesn't have to penetrate far into the head.

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It's a far cry from the bionic eyes of science fiction, though. The resolution is only 256 pixels total, because that's how many electrodes can be made to fit on the back of the film. A typical digital camera has resolutions measured in millions of pixels and ordinary human vision involves approximately 1 million nerves, and more than 100 millon rod and cone cells. But it is something.

"At 256 we start to get some function back to people," Kelly told Discovery News.  He said people who tested the system reported the ability to see some shapes and light and dark regions. The tests were not "field tests" in real-world conditions, but situations where the implant was used for a few hours and then removed.

There have been other proposals for retinal implants. Recent work in Britain used a self-powered retinal implant that is powered by light that enters the eye rather than the external glasses. At the University of Tubingen in Germany, another project involves an implant that has a 1,500 pixel resolution that is inserted below the retina.

Kelly said the difference with his design is that the processor is sealed well enough that no water vapor gets inside. Ordinarily the liquids in the eye (and the body generally) are in chemical equilibrium, but any implanted device with wires has spaces in it that can allow small amounts of vapor to form, which can reduce the implant's effectiveness." We have more intelligence in the eye," Kelly said. "Ours is designed to be stable long term."

BLOG: Bionic Ear Could Replace Cochlear Implants

One kind of blindness that will be targeted with this device is retinitis pigmentosa, a hereditary disease that destroys the cells in the eye that recieve light. Military veterans could also be helped. (Kelly recently recieved a $1.1 million grant from the Department of Veterans' affairs). Some veterans of World War II and Korea suffer from age-related macular degeneration. Others had their eyes damaged by laser rangefinders, Kelly said. The lasers (which are far more powerful than barcode scanners or CD players) can injure the eyes in a way that causes damage later in life.

Image: Carnegie Mellon University




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05/18/2012

Self-Powered Bionic Eye to Restore Eyesight

Retina

For the over-55 crowd, the risk of vision loss goes up. A new self-powered bionic eye being developed by a team of opthalmologists and physicists could help restore eyesight to older adults with severely limited eyesight.

Liquid Body Armor Hardens on Contact

The common condition, called age-related macular degeneration, destroys the most sensitive part of the retina located at the back of the eye. When that part goes, objects become so blurry that it's difficult to recognize faces, drive a car or read text. Retinal implants do exist, but they are bulky and require complex surgery.

A team from Stanford University and the University of Strathclyde in the United Kingdom has created a thin prosthetic chip from silicon that electrically stimulates neurons in the retina. Unlike other retinal implants, the device is photovoltaic so it wouldn't require complicated surgery for a battery-powered setup.

Daniel Palanker, associate professor of opthalmology and experimental physics at Stanford, along with UC Santa Cruz associate physics professor Alexander Sher and postdocs Keith Mathieson and Jim Loudin led the work, which was recently published in the journal Nature Photonics (abstract).

The prosthesis works in tandem with video glasses that record images and then project what's been captured onto the eye. As the BBC's James Gallagher reported, the glasses fire beams of near infrared light onto the retinal chip, creating an electrical signal that's then passed on to nerves. When the retina is stimulated this way, visual perception occurs.

Although they have yet to test it in humans, the group reported in their Nature article that the chip successfully stimulated degenerate retinas in rats.

Terminator-Style Contact Lens Closer to Reality

"With our device, the surgeon needs only to create a small pocket beneath the retina and then slip the photovoltaic cells inside it," Palanker said in a description of the technology from the University of Strathclyde.

For those who have age-related macular degeneration, the federally-funded National Eye Institute suggests tools such as reading glasses with high-powered lenses, handheld magnifiers, and talking watches. Now that corrective laser eye surgery has become so common, I can easily imagine a day in the future when going in to get safe, effective bionic eyes is an expected part of getting older.

Photo: Projected image of a human retina. Scientists are developing a simple remote-controlled prosthetic version. Credit: Ralph Aichinger



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05/01/2012

Bionic Ear Could Replace Cochlear Implants

Cochlear implant

While cochlear implants have been around for a while, they aren't true "bionic ears." There are still external components, such as a microphone.

Now a team of engineers at the University of Utah and Case Western Reserve have built a device that could put more of the components inside the ear, making them more convenient, as well as less bulky.

BLOG: Brain Implant Helps Paralyzed Limbs Move

In a normal ear, sound comes in through the ear canal, hits the eardrum and causes it to vibrate, which sends a chain of vibrations through tiny bones called the malleus, incus and stapes. The stapes hits the cochlea, a fluid-filled chamber, and that moves the hair cells on its inner membrane. That in turn stimulates the auditory nerve, which carries the sound signals to the brain.

Darrin J. Young, an associate professor of electrical and computer engineering at the University of Utah, moved the external components inside the ear and came up with another way to stimulate the auditory nerve. Sound moves through the ear canal to the eardrum, which vibrates as it does normally. At the point where the eardrum connects to the malleus, called the umbo, a tiny acceleromoter is implanted to pick up the vibrations. The accelerometer is attached to a chip, and together they serve as a microphone that picks up the sound vibrations and converts them into electrical signals that reach the cochlea via electrodes.

That's very different from an ordinary cochlear implant, which has the microphone, signal processor and transmitter placed outside the ear.

NEWS: 'Bionic Eye' Implant Offers Hope to the Blind

To date, tests have all been done on cadavers, so while the researchers know that the device works (the sound signals are being transmitted to the right parts of the ear and vibrating the umbo), that doesn't tell anyone what the experience might be like for patients. Tests in living patients are still a few years away.

There is also still work to be done in improving the microphone, which has some trouble with lower-frequency, quieter sounds. The charger for the device would also still be external, just as in conventional cochlear implants.

Photo: A tiny microphone is shown attached at right to a cadaver’s umbo, where the eardrum (under left part of device) meets the hearing bones. The device measures about one-tenth inch by one-quarter inch.

Credit: Case Western Reserve University / University of Utah

via University of Utah




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04/28/2012

ExoHand Boosts Strength, Transmits Touch

Exohand2

Imagine a remotely operated robot hand that imitates the movements of its operator exactly -- picking up objects and manipulating them, perhaps in environments too dangerous for people to work in. Or an exoskeleton that prevents repetitive stress injury.

The ExoHand, from Festo, a German company, may one day do just that. Showcased at a recent trade show in Hanover, this exoskeletal system is designed to provide greater strength and dexterity to the user.

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External actuators boost the grip strength of the wearer, and a software algorithm controls the position of the joints. But the ExoHand can do more than make a person's grip strong -- it can also transmit the motions of the wearer in real time to a robot, with a silicone hand fitted where a human one would ordinarily be.

One thing the ExoHand has is feedback; the operator gets a sense of the pressure exerted on the object grasped. That makes remote operation a lot more precise -- one has a "feel" for the object that isn't there with traditional remote-controlled robot graspers.

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Though the ExoHand is still in the proof-of-concept stage, it's a big improvement on the claws or mechanical graspers common in robotics and automated systems, as it duplicates the movements of fingers and can grab things more delicately. It's also better than a traditional glove box for handling objects that might be dangerous where more room is needed to operate.

The ExoHand might one day be used in factories where people do repetitive tasks -- by assisting the wearer, it reduces the strain on muscles. It could also show up in physical therapy, not unlike the Ekso, an exoskeleton designed for paraplegics.

Credit: Festo




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04/26/2012

Exoskeleton Helps Paralyzed Patients Walk

Amanda boxtel walk 3

Exoskeletons have been designed for military use and boosting strength. But the same technology that makes people able to lift heavier loads might also one day allow those with spinal injuries to walk.

Ekso Bionics, a California company, developed the Human Universal Load Carrier, or HULC, a military exoskeleton licensed to Lockheed-Martin (at that time the company was known as Berkeley Bionics). Ekso developed another exoskeleton, also called the Ekso, for people who need either physical therapy or rehabilitation. Other exoskeletons have been built for arm movement; this is among the first to help people move their legs and to be commercialized in the United States (another type, called Rex, is available in New Zealand, but it works on different principles).

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Amanda Boxtel is one of those people. Her legs were paralyzed after a skiing accident in 1992, at the age of 24. "I never thought I would walk again," she said today at a press event in New York City. Now she practices walking with the Ekso. Demonstrating it, Boxtel was able to take steps, and even turn around, if slowly. Even though she was assisted by engineer Thomas Dwyer, who controlled it using a small game-controller-like device,it showed the possibilities.

The Ekso is currently used in hospitals and physical therapy centers. Right now it offers more natural movement to people who might need help rebuilding muscles after an injury, or relearning to walk after a stroke. It can't walk backwards or climb stairs, though.

That will change in future iterations. Within two years, said Mike Magill, sales and marketing consultant to Ekso, there will be a model for the home -- slimmer, lighter, and able to move in all the ways that humans ordinarily do. "It should be as easy as putting on a pair of jeans," he said.

NEWS: 'Iron Man' Type Exoskeleton Aids Recovery

For a person to walk, the Ekso has to look at where their weight is, as well as check how the leg is bent and the location of the other leg. If certain conditions are satisfied, it takes the next step. Dwyer said a person can walk by just shifting her weight. At present the exoskeleton needs to be used with crutches, but as the system is refined, they will become unnecessary, he added.

One thing that's different from the HULC (see a video here of the Science behind the HULC) is the kind of power the motors use and how much they need. The HULC uses hydraulic systems for extra strength and requires a lot more power. The Ekso uses smaller electric motors and is powered by what is essentially a laptop battery (if a bit more powerful). It doesn't need to lift hundreds of pounds in addition to the user, so it can be made smaller and slimmer. Eventually, the company also hopes to make one that can be easily taken on and off and is small enough to wear.

Beyond walking, there are also therapeutic benefits. When the legs move circulation is better, and it can help patients who might recover use of their limbs to exercise as part of their therapy.

NEWS: 'Bionic Eye' Implant Offers Hope To The Blind

Boxtel said she can't wait to get one. One big reason: plane rides. Wheelchair users can't bring their chairs onto a plane because the aisles are too narrow. So they have to wait for the crew to get them a special chair to get them out. "I don't know how many times I've been left there, forgotten," she said.

Beyond that, there are therapeutic benefits. Boxtel said when she uses it the circulation in her legs gets better, and with it her overall health. She also likes being able to stand. "For the first time in twenty years, I can see people at their level."

Photo: Amanda Boxtel and Thomas Dwyer demonstrate the Ekso.

Credit: Jesse Emspak



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