(Georgia Institute of Technology, 2010-06)
Sonenblum, Sharon Eve; Sprigle, Stephen
The objective of this study was to evaluate the biomechanical responses to tilt in persons with SCI. Changes in
blood flow and loading at the ischial tuberosities (ITs) across different amounts of tilt were measured with Laser
Doppler flowmetry and interface pressure. Pressure reduction at the IT was not present at 15°, but did occur with
tilts to 30° and greater. Unlike pressure, blood flow increased with all tilts from an upright position. Only 4 of 11
participants had a considerable increase (≥10%) in blood flow at 30° tilt, whereas 9 participants did during
maximum tilt (i.e., 45°-60°). Based on the results of this study, tilting for pressure reliefs as far as the seating
system permits is recommended to maximize the potential for significant blood flow increases and pressure relief.
The use of interim small tilts is also supported, as they also provide some benefit.
This design utilizes a forward offset drive wheel to shorten the overall length of the chair, bring the handrim forward facilitating a better propultion stroke and position the drive wheels closer to the center of mass making it easier to turn in place.