Hi friends! I have shared a PPT of Tongue Drive System. The "Tongue Drive" system is a wireless tongue-operated assistive technology developed for people with severe disability to control their environments such as: Wheel chairs Computers Other devices It is a very User friendly system for the Severe disabled persons.

2. Presented By
Sangita Satapathy

3. Contents:
1. Introduction
2. Definition
3. Working
4. Advantages and disadvantages
5. Conclusion
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4. Introduction:
A large group of assistive technology devices are
available that are controlled by switches.
Ex:
# hand splint
# blow-n-suck (sip-n-puff) device
# chin control system
# electromyography
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5.  They provides limited degree of freedom and critical
for severe disable people to lead self supportive
independent life.
 Head mounted devices have been developed that
emulate a computer mouse with head movements.
Limitation in these type of devices is user’s head
position should always be within the range of sensors
E.g.: Controller may not be accessible when user is
lying on bed.
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6. Operating the assistive device must be:
# easy to learn
# require minimum effort
# small in size
# low cost
It leads to an efficient assistive technology :
TDS

7. TDS:
Tongue Drive SySTem
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8. Where it will use:
1. Industrial
2. Medical
3. Scientific
It would help the severe disabled patient to operate
computer, communicate their intentions, effectively
control their environments , improve their life quality
and even help them to be employed
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9. The "Tongue Drive" system is a wireless tongueoperated assistive technology developed for people with
severe disability to control their environments such as:
Wheel
chairs
Computers
Other devices
The tongue is considered an excellent attachment in
severely disabled people for operating an assistive
device .

10. • Scientists chose the tongue to control the system
because unlike the feet and the hands, which are
connected by brain through spinal cord , the
tongue and the brain has direct connection
through cranial nerve.
• In case when a person has a severe spinal cord
injure or other damage , the tongue will remain
mobile to activate the system.
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11. It is developed to recognize a wide array of tongue
movements and to apply specific movements to
certain commands, taking into account user’s oral
anatomy, abilities and life style.
It needs no surgery for its operation
It has a very low rate of perceived exertion
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12. Tongue operated assistive devices
• Tongue touch keypad
• Tongue mouse
• Tongue point
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13. Tongue touch keypad
It is a switch based system
Since tongue is not influenced by the position of rest of
the body, so it is more user comfort.
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14. Tongue mouse
It is another device that has an array of piezoelectric
ceramic sensors.
Which elements can detect strength and position of a
touch by the tongue
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15. Tongue point
It can adapts the IBM track point pressure
sensitive isometric joystick for use inside the
mouth
Which can cause inconvenience during speaking
or eating
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16. Since the tongue and the mouth occupy an amount of
sensory and motor cortex that rivals that of the fingers and the
hand, they are inherently capable of sophisticated motor control
and manipulation tasks.

17. Sangita Satapathy
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18. Working of TDS
In Tongue Drive system, the motion of the tongue is
traced by an array of Hall-effect magnetic sensors.
Magnetic sensors attached on the outside of teeth to
measure the magnetic field generated by a small
permanent magnet from different angles and provides
continuously real-time analog outputs
The analog outputs are then digitized, modulated and
transmitted to the external controller unit
wireless link.
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across a
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19. TDS
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20. The sensor outputs are transmitted to a
PDA( Personal Digital Assistant) also worn by user.
A Sensor signal processing(SSP) algorithm running
on the PDA classifies and converts them into user
control commands.
These commands are then wirelessly communicated
to the targeted device in the user’s environment.
 The user can also define a command to switch the
TDS to standby mode when he wants to sleep, engage
in gossiping or eat.
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21. Components;
ISM = industrial, scientific, and medical (radio
frequency band);
PC = personal computer;
PDA = personal digital assistant;
TV = television.
• Assigning a certain control function to each particular
movement is done in software and can be easily
customized functions.
• These customized functions may then used to operate
the devices/ equipments like:
computer, phones, wheel chairs, motorized beds etc.
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22. Magnetic Sensor Modules
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23. Six commands were defined:
1. left
2. Right
3. Up
4. down
pointer movements
5. single- and 6. double-click movements.
• A pair of two-axis magnetic field sensor modules was mounted symmetrically
at right angles on the face shield close to the user’s cheeks.
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24. Advantages of TDS:
Few sensors are able to capture a wide verity of
tongue movements.
Adoptive control over the environment.
Expected to more robust.
SIMPLE to implement , easy to operate , flexible
NO surgery needed
OFFERS better privacy to the user
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25. Disadvantages of TDS:
Implementation is slightly harder.
Slightly costlier.
USERS should avoid inserting ferromagnetic objects
in their mouth.
(ferromagnetic substances: Iron, nickel, cobalt)
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26. conclusion
A tongue operated magnetic sensor based wireless
assistive technology has been developed for people with
severe disabilities to lead a self-supportive independent
life enabling them to control their environment using
their tongue.
This technology works by tracking movements of
permanent magnet, secured on the tongue, utilizing an
array of linear Hall-effect sensors.
 Other advantages of the Tongue Drive system are being
unobtrusive, low cost, minimally invasive, flexible, and
easy to operate.
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