Cochlear Implant Electrode Proximity Analysis Using ECAP Signals
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Solution Overview
Problem
Existing medical devices, such as cochlear implants, face challenges in accurately determining the relative proximity of electrodes to the modiolus during surgical implantation, affecting the spread of excitation and overall hearing performance.
Innovation Solution
The method involves capturing evoked compound action potentials (ECAPs) via electrodes inserted into the inner ear to estimate the proximity of these electrodes to the modiolus, using techniques like Spread Of Excitation (SOE) functions and ECAP threshold profiles to optimize electrode positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are inserted into the inner ear during cochlear implant surgery, then the device can provide therapeutic benefits and monitoring functions, but the relative proximity of electrodes to the modiolus cannot be accurately determined, affecting spread of excitation and hearing performance
Solution Approach 1:
The patent replaces mechanical measurement systems with electrical field-based measurements. By applying electrical stimuli through the electrodes and measuring the resulting evoked compound action potentials (ECAPs), the system determines electrode proximity to the modiolus without requiring direct mechanical measurement. The Spread Of Excitation (SOE) function analyzes the spatial distribution of neural activation to infer electrode positioning relative to the modiolus.
Solution Approach 2:
The patent introduces ECAP measurements as an intermediary to indirectly determine electrode proximity. Rather than directly measuring distance to the modiolus, the system measures the electrical response of neural tissue to stimulation, using the characteristics of these responses (amplitude, latency, spread) to infer spatial relationships. This intermediary measurement approach enables proximity assessment without direct anatomical measurement.
2Manufacturing precision
If traditional electrode insertion methods are used, then surgical procedure is simpler, but electrode positioning precision relative to the modiolus is insufficient
Solution Approach 1:
The patent performs preliminary electrical measurements (ECAP and SOE assessments) during the surgical insertion process to determine optimal electrode positioning before final implantation. By measuring the spread of excitation and neural responses in real-time, the system identifies the optimal depth and orientation of electrode insertion relative to the modiolus, allowing surgeons to adjust positioning before committing to the final implant configuration.
Solution Approach 2:
The patent implements a feedback mechanism where ECAP measurements and SOE function analysis provide real-time information about electrode positioning quality. The system continuously monitors neural responses to stimulation and uses this feedback to guide further insertion or adjustment of electrodes, ensuring optimal proximity to the modiolus. This closed-loop approach enables dynamic optimization of electrode placement during surgery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for improved electrode positioning, reducing the spread of excitation and enhancing hearing outcomes by ensuring electrodes are optimally positioned relative to the modiolus, thereby improving surgical precision and device efficacy.
Implementation Method 1
capturing a plurality of electrically evoked compound action potentials (ECAPs) via electrodes configured to be inserted into an inner ear
Data Source
AI summary
Presented herein are techniques for use of evoked biological responses (evoked responses), to determine relative proximity of electrodes to a target structure in a recipient. For example, in certain embodiments, the techniques presented herein use evoked biological responses to determine the relative proximity of electrodes to a modiolus of a cochlea.