Page 280 - Handbook of Electronic Assistive Technology

Chapter 9 • Powered Mobility 269

It is also possible to control multiple devices from a single switch (integrated access,
Chapter 10) where such an interface is available. Control is achieved by using a timed
response from the user to select menu and submenu options. Programming is the key to
success taking into account what is most effective for the user and their preferences.

Maintenance and Reliability

The position of the access method is an important factor to consider. For example, if a
joystick is side mounted and reasonably well protected from passing obstructions, there
should be few issues with reliability. Conversely, where a joystick or switches are tray
mounted and being taken on/off repeatedly, there is a high chance of failure unless the
tray is removed and stowed carefully and the cables are treated with respect each and
every time. Factoring in adjustable seating components also adds to the complexity as the
cables must have sufficient ‘spare’ length to allow the articulation, but the ‘spare’ length
must be safely stowed at all times.

Powered Wheelchair Selection
Introduction

When selecting a powered wheelchair there are many important factors to be considered
to ensure the most suitable piece of equipment is chosen. Additionally, there has never
been such a wide choice of options available, and so without experience and guidance it
can be a daunting experience for an individual selecting the most appropriate chair for
their needs.
Many people start this process on the internet or at a trade show, of which there are
many. It is usually helpful to trial a variety of chairs because they will each offer differences
in specification and drive characteristics. It can be just as difficult to choose a powered
wheelchair as a car, and can also be just as costly, so it is vital to find a trustworthy manu-
facturer or dealer to assist with this highly specialist area if the chair is to be purchased
privately. If the individual meets the criteria for provision from a statutory service, it is
important for the individual to make a comprehensive list of their specific needs, even if all
of these options are not available through the statutory provider. In the United Kingdom,
the wheelchair services’ voucher/personal wheelchair budget schemes may allow the
individual to specify additional features.
Seat to Ground Height

Along with the usual measurements of seat width and seat depth, the height of the seat to
the ground is also one of the first pieces of information that should be gathered, because it
will guide the initial selection process. The main considerations are:

• Standing transfer – lower leg length.
• Sideways transfer – height of adjacent surface.