Cochlear Implant Electrode Barriers for Current Confinement
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Solution Overview
Problem
Conventional hearing aids and cochlear implants face challenges in effectively stimulating the auditory nerve for individuals with conductive and sensorineural hearing loss, particularly in managing the flow of perilymph and limiting current spread within the cochlea to enhance sound perception.
Innovation Solution
An implantable stimulating assembly with an electrode contact and carrier, featuring barriers that extend around the electrode contact to manage perilymph flow and limit current spread, thereby enhancing the delivery of electrical stimulation to the cochlea.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode arrays are inserted into the cochlea, then electrical stimulation can be delivered to the auditory nerve, but current spread occurs in multiple directions reducing stimulation precision
Solution Approach 1:
The electrode array is segmented into multiple individual electrode contacts spaced along the cochlear implant, with each contact capable of independent stimulation. This segmentation allows precise targeting of specific auditory nerve fibers while the barrier further isolates current flow to prevent spread between adjacent electrodes.
Solution Approach 2:
A barrier structure is introduced as an intermediary element between the electrode contact and the perilymph-filled cochlear environment. This barrier acts as a mediator that directs and confines current flow through the perilymph to the intended target (auditory nerve/spiral ganglion cells) while preventing current spread to adjacent regions.
2Reliability
If perilymph flow is not managed, then natural cochlear fluid dynamics are maintained, but current spread increases reducing stimulation effectiveness
Solution Approach 1:
The barrier provides localized modification of the cochlear environment around each electrode contact. Instead of altering overall perilymph flow throughout the cochlea, the barrier creates a localized zone of controlled fluid dynamics immediately surrounding the electrode, confining current flow to a specific region while maintaining natural flow elsewhere.
3Measurement precision
If barriers are added around electrode contacts, then current spread is limited and stimulation precision is improved, but device complexity increases
Solution Approach 1:
The barrier is merged with the electrode carrier member to form an integrated structure. Rather than being a separate component requiring additional assembly steps, the barrier is formed as part of the carrier itself (or as a coating thereon), simplifying the manufacturing process and reducing the number of discrete parts while maintaining the current-confining function.
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
The solution improves sound perception by concentrating the stimulation current and reducing current spread, leading to more effective activation of hearing channels and potentially increasing the number of effective frequency channels for the recipient.
Implementation Method 1
managing flow of perilymph located inside the cochlea locally to the electrode contact while the current is provided to the electrode contact
Data Source
AI summary
A method, including providing an electrical current to an electrode contact located in a cochlea of a human to evoke a hearing percept, and managing flow of perilymph located inside the cochlea locally to the electrode contact while the current is provided to the electrode contact. In an exemplary embodiment, the management is executed using a seal.