Mathematical model of calculating the minimum stimulation current based on neural response telemetry data in cochlear implantation systems

The aim of the research is to develop the alternative model based on the experimental data in the course of the cochlear implantation, to calculate the minimum stimulation current that generates an electrically evoked action potential of auditory nerve in cochlear implantation systems. The experimental data (the current and action potential) were received from 69 patients. The core of the mathematical model is power function approximation as well as construction of tangents to the midpoint, introduction of correction factors. Due to the additional algorithm, during the implant testing the minimum “visual” current which was used as the true one when estimating the model application proposed by the authors was determined. Additionally, the minimum current within the linear approximation model was calculated. Statistical data processing was conducted in MS Excel, Spearman’s rank correlation method for correlation assessment was used. The alternative model may be used in case of computer-assisted algorithm malfunction for various reasons both in intra- and postoperative period.