Download - Powered Wheelchair Anu
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POWEREDWHEELCHAIR
Presented by,
ANU MARIA PAUL
S7 BME
NO: 3
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Wheelchair
wheelchairs were designed to provide the veteransome mobility within the hospital and home.
Mobility among people with disabilities varies.
Mobility is more of a functional limitation than adisability related condition.
There are two basic classes of wheelchairs:
1. manually powered
2. externally powered
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Powered Wheelchairs
A power wheelchair may provide greatermobility.
It may be best to suggest a power wheelchair forlonger excursions.
Powered wheelchair bases can be classified as
1. rear-wheel drive (RWD)
2. mid-wheel drive (MWD)
3. front-wheel drive (FWD)
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RWD
In RWD power bases, the drive wheels are behind the
users center of gravity and the casters are in the
front. RWD systems are the traditional design.
Advantage: RWD systems is its predictable drive
characteristic and stability.
Drawback: RWD system is its maneuverability in tight
areas because of a larger turning radius.
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MWD
In MWD power bases, the drive wheels are directly
below the users CoG and generally have a set of
casters or antitippers in front and rear of the drive
wheels.
Advantage :MWD system is of smaller turning radius
to maneuver in tight spaces.
Disadvantage: has a tendency to rock or pitch forward,
especially with sudden stops or fast turns.
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FWD
A FWD power base has the drive wheels in front of theusers CoG, and it tends to be quite stable and
provides a tight turning radius.
Advantage: may climb obstacles or curbs more easilyas the large front wheels hit the obstacle first.
Disadvantage : has more rearward CoG; therefore,the system may tend to fishtail and be difficult todrive in a straight line, especially on unevensurfaces.
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Parts Of Powered wheelchair
Power Wheelchair Interfaces
Proportional Position-Sensing Joystick
Switched Inputs Force-Sensing Control
Voice Control
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Switched Inputs
Durability is a primary consideration when
choosing a control interface for a person with
this disability.
Switch array can be mounted on the
wheelchair tray and accessed by the hand,
head, and chin.
Typically yields much lower performance than
other proportional joysticks.
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Force-Sensing Control
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CONTD
An isometric Joystick does not use spherical ororthogonal pivots on the base of the stick; the
shaft and handle are permanently fixed in a
vertical position. The force vector exerted bythe operators hand becomes the magnitude
and direction of input.
The isometric was superior to the position-
sensing joystick for driving straight and for
driving in a circle.
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Voice Control
The voice control wheelchair system requires a
voice processor that converts a preselected set
of sounds spoken by the user into
corresponding signals a computer can
recognize. The sounds of commands are
preprogrammed into the computer during a
training session. These commands serve as thebasis for comparison with the users command
during use of the wheelchair.
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Powered wheelchair velocity control
scheme.
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Thank you