Cochlear Implant Electrode Migration Detection via ECAP Signals
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Solution Overview
Problem
Cochlear implant systems face challenges in detecting post-operative electrode array migration, which can lead to degraded sound quality and speech understanding, especially in young children where symptoms may not be immediately reported.
Innovation Solution
A cochlear implant system equipped with an electrode migration monitoring unit that captures and compares Electrically Evoked Compound Action Potentials (ECAP) signals over time to detect any shifts indicative of electrode migration, and outputs an alarm signal if migration is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-operative imaging is used to detect electrode migration, then detection capability is improved, but the process requires sedation of pediatric patients and radiologic investigation, increasing complexity and time loss
Solution Approach 1:
The patent replaces the mechanical/radiologic imaging system with an electrical signal-based detection system. Instead of using radiologic investigation and physical imaging procedures, the system uses electrically evoked compound action potentials (ECAPs) recorded through the electrode array to detect electrode migration. This substitution eliminates the need for sedation and complex radiologic procedures while maintaining detection capability.
Solution Approach 2:
The system uses the electrode array itself to detect migration of the electrode array. By recording ECAPs through the same electrodes that are potentially migrating, the system enables self-diagnosis without requiring external imaging equipment or complex procedural interventions. The electrode array serves both its stimulation function and its detection function.
2Measurement precision
If post-operative imaging is used to detect electrode migration, then detection capability is improved, but time loss increases due to the imaging process and patient preparation
Solution Approach 1:
The system enables continuous monitoring of electrode position through ongoing ECAP recordings. Instead of intermittent imaging procedures that require scheduling and preparation, the system can continuously or frequently monitor electrode status through the electrode array, eliminating time loss associated with imaging scheduling, patient transport, and procedure setup.
Solution Approach 2:
By replacing time-consuming radiologic imaging with rapid electrical signal recording through the electrode array, the system dramatically reduces detection time. ECAP recordings can be obtained quickly through the existing implant hardware without requiring the time necessary for imaging preparation, positioning, and image acquisition.
3Ease of manufacture
If thin and short lateral wall electrode array designs are used, then ease of implantation is improved, but electrode migration occurrence increases
Solution Approach 1:
The system provides feedback about electrode position status through continuous ECAP monitoring. When electrode migration is detected, the system can alert clinicians to adjust stimulation parameters or intervene to reposition electrodes. This feedback mechanism allows the system to compensate for the reduced stability inherent in thin, short electrode arrays, maintaining reliable operation despite the easier implantation design.
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
Enables early and convenient detection of electrode migration without the need for sedation or radiologic investigation, allowing for timely intervention to maintain optimal sound processing and speech understanding.
Implementation Method 1
The ECAP is a voltage signal which comprises a negative and a smaller positive peak; the typical order of magnitude of the ECAP is between 1 and 1000 μV.
Data Source
AI summary
A system may include an electrode migration detection unit adapted to detect electrode migration associated with an electrode array relative to a cochlea of a patient by comparing presently captured signals and/or data derived from the presently captured signals to previously captured signals and/or data derived from the previously captured signals, the presently captured signals and the previously captured signals induced by applying auditory nerve stimulation signals to one or more electrodes of the electrode array. The system may further include an alarm unit adapted to output an alarm signal based on the electrode migration detection unit detecting the electrode migration.