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Surface electromyography is a process which records the electrical activity of muscles at rest or during contraction. Processing of these signals for the purpose of controlling an assistive device allows the user to directly influence the actions of the device. The proposed exoskeleton device will assist the motion of a user in extension and flexion of the arm at the elbow, and manipulation of the...
This paper describes an adaptive algorithm for selecting per-electrode stimulus intensities and inter-electrode stimulation phasing to achieve desired isometric plantar-flexion forces via asynchronous, intrafascicular multi-electrode stimulation. The algorithm employed a linear model of force production and a gradient descent approach for updating the parameters of the model. The adaptively selected...
Although asynchronous intrafascicular multi-electrode stimulation (IFMS) can evoke fatigue-resistant muscle force, a priori determination of the necessary stimulation parameters for precise force production is not possible. This paper presents a proportionally-modulated, multiple-input single-output (MISO) controller that was designed and experimentally validated for real-time, closed-loop force-feedback...
A method of measuring tri-axial plantar fascia strain that is minimally affected by external compressive force has not previously been reported.The purpose of this study was to assess the use of micro-strain gauges to examine strain in the different axes of the plantar fascia.Two intact limbs from a thawed, fresh-frozen cadaver were dissected, and a combination of five linear and one three-way rosette...
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