Cochlear Implant Stimulation Configuration Management for Electric Field Focusing
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Solution Overview
Problem
Cochlear implants using multipolar stimulation configurations often result in broader excitation fields than monopolar configurations due to increased current requirements, leading to suboptimal control of current flow and unwanted percepts, especially when electrode positioning is incorrect or neural survival demands high current levels.
Innovation Solution
A stimulation configuration management system that obtains electric field imaging data for both monopolar and multipolar configurations, scales the data to most comfortable stimulation levels, and selects the configuration that maximally focuses the electric field, switching between monopolar and multipolar configurations as needed for each electrode to optimize current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multipolar stimulation configuration is used to focus electric field and control current flow, then current control is improved, but excitation field becomes broader and unwanted percepts increase
Solution Approach 1:
The system dynamically changes stimulation parameters including configuration type (monopolar/multipolar), current amplitude, and pulse width based on real-time feedback from neural responses. This allows optimization of current flow control while minimizing unwanted percepts by adjusting parameters to match actual neural survival and positioning conditions.
Solution Approach 2:
The system uses feedback from measured neural responses (compound action potentials) to adaptively adjust stimulation configuration and parameters. By monitoring neural responses and adjusting stimulation accordingly, the system achieves precise current control while avoiding over-stimulation that causes unwanted percepts.
2Measurement precision
If multipolar stimulation configuration is used to focus electric field, then speech perception is improved, but current requirements increase exponentially
Solution Approach 1:
The system dynamically selects between monopolar and multipolar configurations and adjusts current amplitude based on measured neural responses. This adaptive parameter change allows achieving necessary electric field focusing while minimizing current requirements by using the least intensive effective configuration for each electrode.
Solution Approach 2:
The system applies partial multipolar stimulation where only a portion of current is returned via flanking electrodes rather than full multipolar configuration. This partial action achieves sufficient focusing for speech perception while reducing the exponential current increase associated with complete multipolar stimulation.
3Use of energy by moving object
If monopolar stimulation configuration is used, then current requirements are lower, but electric field is not focused and current spread within cochlea increases
Solution Approach 1:
The system dynamically changes stimulation configuration from monopolar to multipolar based on measured neural responses and electrode positioning. When better focusing is needed, the system transitions to multipolar configuration, accepting higher current requirements as necessary to achieve precise current flow control for that specific electrode.
4Measurement precision
If stimulation configuration is optimized for each electrode individually, then speech perception is improved, but system complexity increases
Solution Approach 1:
The system performs automated electrode-by-electrode optimization using measured neural responses to automatically determine optimal stimulation configurations. This self-service approach eliminates the need for manual programming of each electrode, managing the complexity internally while delivering optimized speech perception performance.
Solution Approach 2:
The system systematically varies stimulation parameters including configuration type, current amplitude, and pulse width for each electrode based on measured responses. This structured parameter exploration and optimization process manages complexity through methodical adaptation rather than requiring complex pre-programming.
Data Source
AI summary
An exemplary stimulation configuration management system may 1) obtain electric field imaging (EFI) data for a plurality of stimulation configurations associated with an electrode included in an intracochlear electrode array that is a part of a cochlear implant system associated with a patient, 2) identify, based on the EFI data, a stimulation configuration included in the plurality of stimulation configuration and that focuses an electric field produced by current applied to the electrode more than any other stimulation configuration included in the plurality of stimulation configurations, and 3) direct the cochlear implant system to use the identified stimulation configuration for the electrode during a normal operation of the cochlear implant system.