Bioresorbable Spaced Electrode Array for Cochlear Implant Stability
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Solution Overview
Problem
Existing cochlear implant electrode arrays face challenges in achieving close proximity to the modiolar wall due to lack of sufficient shape memory and difficulty in assembling electrode contacts on the medial side, leading to suboptimal stimulation and potential pressure buildup within the cochlea.
Innovation Solution
A universal electrode array with all contacts spaced along one edge, featuring bioresorbable coated non-conductive bumps that serve as spacers and dielectric insulators, allowing the array to bend and hug the modiolar wall while reducing chronic pressure through absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode array is designed with all electrode contacts on one side to face the modiolar wall, then stimulation effectiveness is improved, but the array structure becomes more complex and difficult to manufacture
Solution Approach 1:
The array is divided into distinct functional zones: electrode contact regions on the medial side for stimulation, and non-conductive bump regions for spacing and insulation. This segmentation allows each zone to perform its specific function optimally while maintaining overall structural integrity.
Solution Approach 2:
Different regions of the array are given different properties: the medial side has electrode contacts for electrical stimulation, while the lateral side has non-conductive bumps for mechanical spacing. This local differentiation of properties enables the array to achieve both stimulation effectiveness and proper positioning without excessive complexity.
2Ease of operation
If the array is made flexible to conform to the cochlear shape, then insertion and positioning are improved, but the array may twist or flex excessively causing electrode misalignment
Solution Approach 1:
The array uses a flexible carrier structure that can bend to conform to the cochlear shape during insertion, while the embedded electrode contacts and non-conductive bumps maintain their relative positions. This flexible shell approach enables easy insertion while preserving electrode alignment through the rigidity of the embedded components.
Solution Approach 2:
The array is designed with a curved configuration that matches the natural spiral shape of the cochlea. This pre-formed curvature allows the array to insert smoothly and conform to the cochlear duct without excessive twisting, while the fixed electrode positions on the medial side ensure proper alignment with the modiolar wall.
3Manufacturing precision
If non-conductive bumps are added as spacers between electrode contacts, then electrode stability and spacing are improved, but manufacturing complexity increases
Solution Approach 1:
The non-conductive bumps are integrated directly into the array carrier structure, combining the spacing function with the structural support function. This merging eliminates the need for separate spacer components and reduces assembly steps, thereby improving manufacturing precision without proportionally increasing complexity.
Solution Approach 2:
The non-conductive bumps serve multiple functions: they act as spacers to maintain proper electrode spacing, provide mechanical support to the carrier, and offer dielectric insulation. This multi-functionality reduces the need for additional components and simplifies the overall manufacturing process.
4Reliability
If the electrode array is inserted deeply into the cochlea to achieve close proximity to ganglion cells, then stimulation effectiveness is improved, but pressure buildup occurs causing discomfort and infection
Solution Approach 1:
The non-conductive bumps act as intermediary elements between the electrode array and the cochlear structures. By providing controlled spacing and a compliant interface, these bumps mediate the interaction between the rigid array and the soft cochlear tissues, reducing pressure concentration while maintaining effective electrode-to-nerve proximity.
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
Enhances electrode contact stability and proximity to the modiolar wall, reducing power consumption and minimizing pressure within the cochlea, thereby improving cochlear implant performance and patient comfort.
Implementation Method 1
a bioresorbable coated material which, over time, is absorbed and thereby reduces pressure buildup within the cochlea
Implementation Method 2
small non-conductive bumps or humps are formed in the carrier between the electrode contact areas on the medial side of the array. These small bumps are made, e.g., from a soft silicone rubber, or equivalent substance. When inserted into the cochlea, the small bumps serve as non-irritating stand-offs, or spacers, that keep the electrode contacts near the modiolus wall, but prevent the electrode contacts from actually touching the modiolus wall. The bumps may also serve as dielectric insulators that help steer the stimulating electrical current in the desired direction
Data Source
AI summary
Implantable electrode leads, e.g. cochlear, spinal cord stimulation, or any type of neurostimulation leads, used in a patient's body to stimulate muscle or nerve tissue, provide enhanced stimulation for treating, e.g., hearing loss or chronic pain. One such lead includes, an implantable electrode array, adapted for insertion into a cochlea, which lead provides improved stability of electrode contact direction. In-line electrodes are spaced-apart along one side of a flexible carrier having non-conductive bumps coated with a bioresorbable material spaced apart between each electrode contact. Over time the bioresorbable material is absorbed thereby reducing chronic placement pressure caused during the insertion of the electrode array into the cochlea. The bioresorbable material may also serve as a carrier for drugs or other materials that would improve performance of the electrode for any type of lead.