Development of Compact and Lightweight Stand-up Powered Wheelchair—Fall Risk Analysis When at Rest and Decelerating

When unassisted walking is difficult, a wheelchair with a stand-up function enables a standing position as well as a sitting position for work and improved convenience. However, in the standing position, the center of gravity is high, and to prevent falling it is common to shorten the long wheelbase of the wheelchair, or to lower its center of gravity. It is also desirable to reduce the size and weight of the wheelchair for space and portability reasons. Therefore, we aim to reduce the size and weight of electric wheelchairs that can move with a stable high attitude by providing a fall-prevention control function. This study reports on the appearance and the dimensions of a prototype stand-up powered wheelchair and the results of a fall risk analysis when at rest and decelerating.