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A theoretical method is presented which uses wave-guiding principles to construct a focused point of stimulation at any location within a region of electrically-excitable tissue. The excitation is formed through the constructive interference of different frequency wave energies, traveling at frequency-dependent velocities, which coalesce at the stimulation point. Further energy is brought to the stimulation point through reflection(s) at the boundaries of the wave-guiding structure. The resulting excitation signal depends upon several factors, including pulse envelope and duration, allowable frequency range, and stimulation time. A necessary trade-off exists amongst stimulation time, pulse duration, and the degree of focus.
Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society EMBS/BMES Conference, 2002. Proceedings of the Second Joint (Volume:3 )
Date of Conference: 23-26 Oct. 2002