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BIONIC HAND

Presented by,Prathibha Saseedharan,

Roll No: 59

S6 BME

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CONTENTS.

Prosthetics.

Orthotics

What is bionic hand?

Bioprosthesis of hand.

Block diagram.

Features of I-LIMB

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Sydney Morning Herald, 18 May 2008The Independent, UK, 25 March 2008

Prosthetics

Vietnam Veterans of America Foundation, 2002

"There is something dignifying

and humanising about being

able to stand up and walk."Olivia Giles, co-founder of500miles, a

charity to support amputees and other

disabled people in developing countries. (TheIndependent, UK, 25 March 2008)

See:

http://www.500miles.co.uk/index.html

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Orthotics

Atlanta Prosthetics & Orthotics, Inc, 2009

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Prosthetics & Orthotics

Science & art involving treatment using Prosthesis

Artificial limb

Orthosis External device

Aim to improve function

Family & home life Work & community life

Sport & leisure activities

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Prosthetics

Pre & post amputation treatment

Provision of limb prosthesis (artificial limb)

Above: Limb following amputation

Right: Transtibial amputee surfing

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Prosthetics

Many of the prostheses

fitted in Australia are

fitted to older people

who have poor bloodcirculation

Prostheses are also

provided for children,

young and middle agedamputees

NCPO student performing initial

fitting of a transtibial prosthesis

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Orthotics

Orthoses or braces are

fitted to people with

musculoskeletal

weakness, or after aninjury

Many orthoses are

custom made for the

individual person

Fitting a Knee Ankle Foot Orthosis

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What is bionic hand?

Bionics provide a scientific link betweenbiology and technology.

Their goal lies in the technical

implementation of construction, processand development principles of biological

systems.

Imitation of natural movement processesand control of prostheses is the object of

biological robotics.

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Individually

powered digits

Myoelectric signal

input to open and

close fingers

Cosmetic coveringis available

i-LIMB Handa fullyarticulating andcommercially availableprosthetic hand.

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Offers a unique,control system that uses atraditional myoelectric signal input to open andclose the hands life-like fingers.

Myoelectric controls utilize the electrical signalgenerated by muscles in the remaining portion ofa patients limb.

This signal is picked up by electrodes that sit onthe surface of the skin.

Users of existing, basic myoelectric prosthetic

hands are able to quickly adapt to the system andcan master the devices new functionality withinminutes.

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Bioprosthesis of handemerging

reality

1. Electrode on efferent nerve;2. Electrode on afferent nerve;3. Implanted part for recording of nervous

activity and nerve stimulation;

4. Efferent telemetric connection;5. Afferent telemetric connection;6. Bionic hand;7. sensors;8. Decoder of patients intentions and

control of prosthesis;9. Unit mediating the signals of sensors to

the brain.10. Subsystems 8-9 will be outside body buteasy to carry.

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The actual interface must be bidirectional, that is, it must include afferent and

efferent tracts.

This is currently possible via various implantable microelectrodes which create a

direct contact with the peripheral nerve.

The structural forms currently used include:

a) the cuff electrode, which is placed around the nerve like a cuff;

b) the shaft electrode, which is inserted into the nerve;

c) the sieve electrode, which is inserted between two nerve stumps which have a

sieve from which the regenerating fibres sprout [5], and

d) the thread electrode, which is drawn through the nerve longitudinally and isintrafascicular

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The currently favoured structural form for human useis the thread electrode (tf-LIFE).

Reasons for this include its relatively

straightforward application,

direct contact with the individual nerve fibres and resulting excellent selectivity, the degree of

miniaturisation obtainable,

the option of fixation to the nerve and resulting

extremely low mechanical strain on the nervenot to

mention its biocompatibility and long-term stability .

The thread electrode is currently in preparation

for first-time clinical use.

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Block diagram of hand prosthesis.

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Proprioceptive sensors for recording the hand positionand hand movement, as well as exteroceptive sensorsfor realizing the hands sensory functions are required.

Such sensors could be used for sensing the movementand position of individual fingers and the force they

apply. These signals are also important for direct control of

grasping movements.

The sense of touch can be simulated using miniaturetouch sensors.

Further sensors could be used for sensing temperature,the mechanical qualities of surfaces,

etc. [4].

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Telemetric data transmission represents an important interfacebetween the technical biological interface and the actuators and

sensors which are integrated into the actual prosthesis.

This is the sole means for interaction between the implant and the

external hand prosthesis. This means that the electrode and

the electronics for signal preprocessing

must be directly linked

All of these individual components determine the options and

particularly the acceptance of bionic hand prostheses to a

significant degree.

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i-LIMB Hand 2.0

The worlds first multi-articulating

bionic hand.

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FEATURES.

Four independent fully-powered

articulating fingers

Manually adjustable thumb

Multiple grip patterns Utilizes standard myoelectric control

Signals

Product Variations

Sizes: Regular, Small, and Low Profile

Sides: Right and Left

Connection: wrist connector or wrist

disarticulation

Color: Natural or Black

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Specifications.

Application: amputations at or above wrist disarticulation for mild to medium activity level

adults

Carrying weight limit: 44 lbs

Palmar force: 21 lbs Voltage: 7.4V

Weight: Regular = 518g; Small = 508g;

Low Profile = 450g

Power Source: i-LIMB Lithium Ion battery pack

Charging Time: 2-4 hours/day

Warranty: 1 year (extended warranty

available)

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It costs US $18 500. And it can do thingsmost other prosthetic hands just cant, like

grabbing a paper cup without crushing it,

turning a key in a lock, and pressingbuttons on a cellphone.

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For those patients who desire a more life-likeappearance for the hand, Touch Bionics haspartnered with some leading companies inthe development of cosmesis for its products.

ARTech Laboratories and LIVINGSKINwork at the forefront of high-definition

cosmesisthese companies are collaboratingwith Touch Bionics to offer patients a life-like solution to compliment the life-likemotions and performance of the hand.

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References.

www.touchbionics.htm

www.physorg.com

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