Design Criteria for the Measurement of Pressure at Body/Support Interfaces

The design characteristics of pressure transducers for use at interfaces between the body and support surfaces such as mattresses, cushions, prosthetic sockets, and beneath bandages are discussed, and criteria for determining the maximum diameter and thickness of suitable devices are developed analytically. Sources of measurement error including transducer response to interface curvature, off-axis stresses, environmental factors and hysteresis are identified. The need for a calibration technique compatible with the mechanical conditions under which measurements are made is emphasized.