Types of Power Assist Devices

The style and type of device suitable for an individual user requires consideration by a multi-disciplinary team.

There are perceived benefits and drawbacks to every type of PAD.
(Khalili, M., et al., 2021, Dhaliwal, M., 2021).

Front Power Assist Device

• A front PAD generally has a motorised wheel located in front of the footplate/footrest
• Attaches to the front of the wheelchair frame
• Elevates front caster wheels
• Controlled by tiller or handle-bar system
• External motor and battery

Rear Power Assist Device

• A rear PAD typically attaches to underneath the wheelchair to the camber tube or between the axles of the rear wheel
• Single caster or rear wheel with omni-directional rollers
• Single battery and motor
• Offers a variety of control methods

Main Wheel Power Assist Device

• With a main wheel PAD, motorised drive wheels take the place of large rear wheels
• Typically contains an accelerometer that requires pushrim input
• Some models compatible with proportional joystick input (full-assist)
• Can have single or dual battery and motor
• Can have individual wheel sensitivity adjustment