A BIDIRECTIONAL LOAD APPLICATOR FOR THE INVESTIGATION OF SKIN-RESPONSE TO MECHANICAL-STRESS

Instrumentation was developed to apply controlled biaxial (normal and shear) forces to the skin of a human or animal subject, The instrument mimicked any reference waveform within the constraints of a bandwidth of 15 Hz, a maximum force of 20 N, and displacement ranges of 15 mm f or the normal direction and 18 mm for the shear direction, Two shaker motors, positioned with their axes parallel, were used with a low effe ctive mass Linkage and small-angle rotational joints to deliver the fo rce, A digital feedback controller independently controlled the instan taneous normal and shear forces and recorded the resultant displacemen ts, Evaluations on human and animal (pig) subjects demonstrated mean a bsolute errors between the applied and reference waveforms of less tha n 1.2% full-scale output for both the normal and shear directions, No degradation in performance was apparent over the course of a l-h loadi ng session, The instrument is to be used for the investigation of skin adaptation to mechanical stress, information that could be used to de sign new therapeutic methods to encourage skin load-tolerance.