Development of a Collapsible Folding Manual Wheelchair Phase II

Principal Investigator/s: Chris Willems, ME; Rory Cooper, PhD

Co-Investigator/s: Donald Spaeth, PhD, RET; Joseph Olson, BS

2003-2005

The purpose of this project was to design an ultra light wheelchair that is able to collapse and fit into an overhead compartment of an airplane. This would eliminate the need to transfer out of one’s own wheelchair when boarding an airplane because the wheelchair could be stored in the overhead compartment. Also, a collapsible wheelchair would make storage and handling easier either in the home or in the car. Some of the design parameters were the wheelchair must be lightweight, durable, adjustable, stable, comfortable, and cost effective.

Methods: Preliminary drawings and sketches for the Forward Folding Ultra light Wheelchair (FFUWC) were made taking into account anthropometry and basic configurations of wheelchairs. The first prototype was built so that by removing two fasteners from the chair, it can fold forward much like a lawn chair. The second prototype was then built with a similar folding design but with adjustable backrest angle, adjustable backrest height, adjustable seat pan angle, and adjustable wheel axle. The second prototype is now being revised according to five main objectives. First, manufacture the forward folding full adjustable wheelchair with industry standard aluminum and construction techniques. Second, refine the design of the frame and associated components of the FWC to improve compactness, maximize functionality, and simplify operation for the end user. Third, re-design the confined area wheels to incorporate quick lock/unlock and multi-functionality options. Fourth, wheelchair is compatible with commercially available accessories. Finally, develop manufacturing documentation for commercial production sourcing.

Results/Current Status: An experienced, 55 kilogram consumer has used the first prototype and has successfully traveled around the world and boarded many planes without having to transfer to a temporary wheelchair for two years. A second generation prototype was tested last year and successfully passed according to the ANSI/RESNA standards, which are used by the VA in selecting appropriate wheelchairs. An SBIR has been awarded for phase two and several commercial grade prototypes have been completed. The latest upgrades include rear wheel fenders, smaller seat and footplate clamps, ergonomic lock/unlock latching system for the confined area wheels, and ergonomic quick disconnects for folding the chair. The documentation of these upgrades has been completed and other revisions have been discussed i.e. a carbon fiber seat plate and a mechanism for fitting any commercial caster.

Phase II funding approved. Phase II Research protocol and Consents approved. In accordance with the suggestions from the focus group, the folding wheelchair has been redesigned. This new prototype wheelchair has passed the ANSI/RESNA durability standards after many setbacks. Fabrication, finishing and assembly of all the 19 wheelchairs for the clinical trial have been completed. In accordance to the protocol, an airplane simulation using real airline seats and an overhead luggage and has been designed and is currently being assembled. Extensive protocol modifications were recently submitted to the VA IRB and were approved with no comments. Currently these same modifications are being reviewed by the University Pittsburgh IRB. After protocol is approved and a successful mock trial, clinical testing will begin. Clinical testing should begin in early 2008.