Materials
Interface pressure measurement profiles were obtained
from a 24-inch · 24-inch square sensor array pad andpressure-mapping system (Xsensor, Calgary, Canada). The
array pad, consisting of 48 · 48 (2304) independent halfinch sensors, is thin and flexible, and uses proprietary
capacitive technology to discretely measure the interface
pressures applied to the pad. An interface box relays the
individual pressure information from each sensor to a
computer for real-time visualization and recording. Calibration is performed by placing the sensor array pad between air
bladders inflated to specific pressures. Accuracy is ±10%.
The device was calibrated to measure pressures from 0 to
200 mmHg.