from Part VI - Brain interfaces
Published online by Cambridge University Press: 05 September 2015
This chapter explores electrical stimulation of excitable biologicalentities. It provides a brief history of electrical stimulation, stimulationparameters, theory of electrode interface impedance, and types ofstimulation. Focus is on the technology of charge balancing, power losses,voltage compliance, and associated hardware complexities of electricalstimulators. Stimulus artifacts and inductive power delivery are alsodiscussed, and are often used with stimulators for applications in neuralprostheses and therapeutics [1, 2].
Introduction
Electrical stimulation is an important and popular method in which injectedcharges are mainly responsible for excitation or inhibition of neural ormotor structures [3–5]. It can be utilized for treatment of diseasesand restoration of dysfunctional organs, such as for the brain [6, 7],retina [8, 9], cochlea [10], or peripheral nerve [11]. The electricalstimulation process is accomplished by using conductive electrodes ofspecific size and shape, which are placed at desired biological sites ofinterest. Coulombic charge is injected through such electrodes by means ofconstant current or constant voltage pulses. Charge injection accuracy,power loss minimization, output voltage compliance, and miniaturization areimportant factors that can enhance practical performance in electronicstimulators [12]. In the following subsections we provide a brief historyand introduce technical parameters associated with electricalstimulation.
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