Cochlear Implant Stimulation Current Threshold Detection
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Solution Overview
Problem
Current methods for determining the most comfortable current level for cochlear implant patients are subjective and challenging, especially for young children and those unable to provide feedback, and require frequent adjustments due to changes in the patient's condition or environment.
Innovation Solution
An implantable cochlear stimulator with adjustable current levels and a sound processor that measures acoustic reflectance to detect the stapedial muscle reflex, allowing for non-invasive determination of the optimal current level for comfortable sound perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If subjective feedback methods are used to determine the most comfortable current level, then the fitting process can be performed with simple equipment, but the method becomes ineffective for patients unable to provide feedback such as young children and those with multiple disabilities
Solution Approach 1:
The patent replaces the subjective feedback-based mechanical/psychological assessment method with an objective acoustic measurement system. The stapedial reflex measurement system uses acoustic reflectance detection to automatically determine the most comfortable current level, eliminating the need for patient subjective feedback and making the fitting process applicable to all patient groups including infants and those with disabilities.
Solution Approach 2:
The patent introduces an intermediary measurement system (acoustic reflectance measurement of stapedial reflex) that serves as a mediator between the stimulator and the patient's comfort level. This intermediary objective measure allows the system to determine the most comfortable current level without directly relying on patient feedback, thus bridging the gap between equipment simplicity and universal applicability.
2Adaptability or versatility
If frequent adjustments of stimulation parameters are made to optimize hearing outcomes, then the fitting can adapt to changing patient conditions, but the number of required fitting sessions increases
Solution Approach 1:
The patent implements an automated feedback system where acoustic reflectance measurements provide real-time information about the stapedial reflex. This feedback mechanism allows the system to automatically adjust and determine the most comfortable current level without requiring multiple manual fitting sessions, thus maintaining adaptability while reducing time loss.
Solution Approach 2:
The patent enables the fitting system to perform self-adjustment through automated stapedial reflex measurement. The system independently determines the most comfortable current level by measuring acoustic reflectance changes in response to stimulation, eliminating the need for repeated clinician-led fitting sessions and reducing the time required for optimization.
3Extent of automation
If automatic determination of the most comfortable current level is implemented, then the fitting process becomes more objective and applicable to all patients, but the device complexity increases
Solution Approach 1:
The patent integrates the stapedial reflex measurement capability into the existing cochlear implant stimulator system, making the device multi-functional. The stimulator can both deliver electrical stimulation and measure acoustic reflectance to determine the most comfortable current level, thereby achieving automation without proportionally increasing overall system complexity.
Solution Approach 2:
The patent combines the stimulation function and the measurement function into a single integrated system. The stimulator delivers electrical pulses while simultaneously measuring acoustic reflectance changes, merging multiple functions into one device and reducing the complexity that would arise from separate independent systems.
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 method enables automatic and objective determination of the most comfortable current level for cochlear implant patients, reducing the need for subjective feedback and frequent adjustments, and ensuring optimal hearing outcomes across varying conditions.
Implementation Method 1
measuring an acoustic reflectance within the ear during the application of the stimulation current
Data Source
AI summary
Exemplary cochlear implant systems include an implantable cochlear stimulator configured to be implanted within a patient and generate a stimulation current having an adjustable current level, one or more electrodes communicatively coupled to the stimulator and configured to apply the stimulation current to one or more locations within an ear of the patient, and a sound processor configured to derive an acoustic reflectance of the patient's ear. The implantable cochlear stimulator is configured to adjust the current level of the stimulation current until the sound processor detects a change in the acoustic reflectance above a threshold.