Dynamic Current Steering for Continuous Cochlear Implant Stimulation
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Solution Overview
Problem
Conventional cochlear implant stimulation strategies fail to accurately represent the rich spatial-temporal patterns of acoustic hearing due to discrete and sequential current pulses, leading to underrepresentation of the frequency spectrum and inability to mimic the continuous analog process of sound waves in the cochlea.
Innovation Solution
Dynamic current steering techniques deliver weighted current stimulation across multiple channels in a spatial-temporal pattern, progressively changing the locus of stimulation to mimic the acoustic traveling wave, using biphasic pulses with balanced charge and varying amplitudes based on the sound signal's frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If discrete and sequential current pulses are used for stimulation, then the device complexity is reduced and ease of operation is improved, but the accuracy of representing acoustic spatial-temporal patterns deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static, discrete pulse delivery to dynamic current steering where the locus of current stimulation progressively changes position across the cochlear implant electrodes over time. This dynamic approach mimics the continuous analog process of acoustic wave propagation, allowing the stimulation pattern to evolve temporally and spatially rather than remaining fixed in discrete steps.
Solution Approach 2:
The patent introduces a temporal dimension to the spatial distribution of current stimulation. By progressively changing the locus of stimulation across multiple electrodes in a controlled temporal sequence, the system creates a two-dimensional representation (space-time) of acoustic signals, transforming the traditional one-dimensional discrete pulse approach into a more comprehensive spatio-temporal stimulation pattern.
2Device complexity
If discrete and sequential current pulses are used for stimulation, then the device complexity is reduced, but the completeness of frequency spectrum representation deteriorates
Solution Approach 1:
The patent implements continuity of useful action by delivering current stimulation as a continuous analog process rather than through discrete interrupted pulses. The current locus progresses continuously across the electrode array, maintaining an unbroken stimulation pattern that preserves the continuous nature of acoustic waveforms and their frequency spectrum information.
Solution Approach 2:
The dynamic current steering approach allows the system to adapt the stimulation pattern in real-time, continuously adjusting the locus position and distribution across electrodes to match the instantaneous characteristics of the acoustic signal, thereby preserving frequency spectrum information that would be lost in discrete sampling.
3Manufacturing precision
If discrete and sequential current pulses are used for stimulation, then the manufacturing precision requirements are reduced, but the fidelity of mimicking acoustic wave propagation deteriorates
Solution Approach 1:
The patent employs dynamics to create a moving locus of current stimulation that progressively traverses the electrode array, mimicking the propagation of acoustic waves through the cochlea. This dynamic approach captures the temporal evolution and spatial progression of sound wave travel, significantly improving the fidelity of acoustic wave propagation simulation compared to static discrete pulses.
Solution Approach 2:
The systematic progression of the current locus through the electrode array follows a periodic pattern that corresponds to the temporal structure of acoustic signals. This periodic action across multiple electrodes recreates the rhythmic and temporal characteristics of sound wave propagation, enhancing the reliability of acoustic mimicry.
Data Source
AI summary
Presented herein are dynamic current steering techniques in which a dynamic stimulation pulse is delivered to a recipient as current stimulation applied across a plurality of stimulation channels. The current stimulation is weighted and applied in a pattern that results in a time varying progressive change in the location of a locus of the current stimulation across the plurality of channels.