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TongueDrivesystem
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INTRODUCTION
Persons with disabilities as a result of various
causes, from brain injury and spinal cordinjury , generally find performing everyday
tasks extremely difficult without continuous
help. To help all those people engineers at
Georgia developed a new technology calledas TONGUE DRIVE SYSTEM.
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WHAT IS TONGUE DRIVE SYSTEM?
a wireless, non contact,tongue-operatedassistive technology
Wireless tongue-operated assistivetechnology for people with little or no upper-limb function
non-invasive technologyTongue Drive system will be helpful toindividuals with serious disabilities
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Requirements to use Tongue drive
system
To operate the Tongue Drive system, users
only need to be able to move their tongues.we need to attach a small magnet, the size of
a grain of rice, to an individual's tongue by
implantation.
Sensitive magnetic sensors
Magnetic tracer
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Tongue Drive System Prototypes
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HOW IT WORKS?
First of all,a smallpermanent magnet the
size of a grain of rice issecured to the tongueas a magnetic tracerby using simpleimplantation under thetongue throughinjection.
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HOW IT WORKS?
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Where itll use?
1. Industrial area
2. Medical sectors3. Scientific sectors
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Tongue operated assistive devices
Tongue touch keypad
Tongue mouse Tongue point
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Tongue touch keypad
It is a switch based system
Itll adjusted maximum user comfort
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Tongue Mouse
It has an array of piezoelectric ceramic
sensors Which elements can detect strength and
position of a touch by the tongue.
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Tongue Point
It can adapts the IBM track point pressure
sensitive isometric joystick for use inside themouth.
Which can cause inconvenience during
speaking or eating.
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MAGNETIC FIELD
The magnetic field generated by the tracer inside
and around the mouth varies as a result of thetongue movements.
These variations are detected by an array ofsensitive magnetic sensors mounted on a headsetoutside the mouth, similar to a head-worn
microphone.The sensor output signals are wirelessly transmittedto a portable computer, which can be carried on theuser's wheelchair.
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MAGNETIC FIELD
Uses Faradays law of induction.
whenever the magnetic field about anelectromagnet was made to grow and collapse by
closing and opening the electric circuit of which it was a
part, an electric current could be detected in a separate
conductor nearby. Moving a permanent magnet
into and out of a coil of wire also induced a current in
the wire while the magnet was in motion. Moving a
conductor near a stationary permanent magnet caused
a current to flow in the wire, too, as long as it was
moving.
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MAGNETIC FIELD
Uses Flemings-Right-Hand Rule.
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sensitive magnetic sensors
Two sensitive magnetic sensorsare attached as a headset and
the sensor outputs arewirelessly transmitted to apersonal digital assistant (PDA)also worn by the user. A sensorsignal converts them into user
control commands that arethen wirelessly communicatedto the targeted devices.
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WHY CHOOSE THE TONGUE?
Engineer , chose the tongue tooperate the system because unlikehands and feet, which are
controlled by the brain through thespinal cord.
The tongue is directly connected tothe brain by a cranial nerve thatgenerally escapes damage insevere spinal cord injuries or
neuromuscular diseases.Tongue movements are also fastand accurate
It do not require much thinking,concentration or effort.
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NON INVASIVE
The Tongue Drive system is non-invasive
and does not require brain surgery like someof the brain-computer interface technologies.
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DESIGN
Ghovanloo, the GeorgiaTech researcher, designed
software that converts theposition of the tongue into
joystick or mousemovements, allowing theseverely disabled to controla wheelchair or computer.
The setup could provide ansimple and powerful meansof locomotion for thedisabled.
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Commands
Ghovanloo's group recently completed trials in whichsix able-bodied individuals tested the Tongue Drive
system.Each participant defined six tongue commands thatwould substitute for computer mouse tasks -- left, right,up and down pointer movements and single- anddouble-click.
An individual could potentially train system torecognize touching each tooth as a different command.
The ability to train system with as many commands as
an individual can comfortably remember .
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ADVANTAGES OF TONGUE DRIVE
SYSTEM
The principal advantage of the TDS is that its 100percent of commands were accurate with the
response time less than one second, which equals toan information transfer rate of approximately 150 bitsper minute.
The ability to train system with as many commandsas an individual can comfortably remember is asignificant advantage.
The user can also define a command to switch theTDS to standby mode when he or she wants tosleep, engage in a conversation, or eat.
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OTHER ADVANTAGES
This technology will reduce the need ofindividuals with disabilities to receivecontinuous help from family members orcaregivers.
Thus significantly reducing healthcare andassistance costs.
This system may also make it easier for themto work and communicate with others, suchas friends and family.
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USES
The ultimate goal in developing the TDS is to
help people with severe disabilities.It preserve an independent, self-supportive
life for them.
This technology allows a disabled person
to use tongue when moving a computermouse or a powered wheelchair.
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Georgia Tech Electrical and Computer
Engineering
Georgia Tech Electrical
and Computer
Engineering graduatestudent Xueliang Huo
moves his tongue to
direct the Tongue Drive
system to move thepowered wheelchair in
a different direction.
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FUTURE TECHNOLOGY
The research team has also begun to developsoftware to connect the Tongue Drive system to a
wide variety of readily available communication toolssuch as text generators, speech synthesizers andreaders.
In addition, the researchers plan to add controlcommands, such as switching the system into
standby mode to permit the user to eat, sleep orengage in a conversation while extending batterylife.
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REFERENCE
http://www.ece.gatech.edu/research/labs/gt-bionics/research_tds.shtml
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6392916
http://www.authorstream.com/Presentation/gouthamsaparam-1558879-tongue-drive-system/
https://www.prjpublication.com%2FPrjAdmin%2FUploadFolder%2FTONGUE%2520DRIVE%2520SYSTEM%2520TO%2520OPERATE%2520COMPUTERS-2.pdf
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