Tongue Drive System Sangita Satapathy

Presented By Sangita Satapathy

Contents:

1. Introduction

2. Definition

3. Working

4. Advantages and disadvantages

5. Conclusion

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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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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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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

Tongue Drive SystemTDS:

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Where it will use:

1.Industrial2.Medical3.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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The "Tongue Drive" system is a wireless tongue-operated assistive technology developed for people with severe disability to control their environments such as:

Wheel chairsComputersOther devices

The tongue is considered an excellent attachment in severely disabled people for operating an assistive device .

• 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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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


Tongue operated assistive devices• Tongue touch keypad• Tongue mouse• Tongue point


Tongue touch keypadIt is a switch based system

Since tongue is not influenced by the position of rest of the body, so it is more user comfort.


Tongue mouseIt is another device that has an array of

piezoelectric ceramic sensors.Which elements can detect strength and position

of a touch by the tongue


Tongue pointIt can adapts the IBM track point

pressure sensitive isometric joystick for use inside the mouth

Which can cause inconvenience during speaking or eating


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.

Working of TDSIn 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 across a wireless link.


TDS


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.


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. Sangita Satapathy 21

Magnetic Sensor Modules


Six commands were defined:1. left2. Right3. Up4. 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.


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 userSangita Satapathy 24

Disadvantages of TDS:Implementation is slightly harder.Slightly costlier.USERS should avoid inserting ferromagnetic

objects in their mouth.

(ferromagnetic substances: Iron, nickel, cobalt)


conclusionA 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.


Tongue Drive System Sangita Satapathy

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