Embedded Stiffeners in Cochlear Electrode Arrays for Buckling Control
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Solution Overview
Problem
Conventional electrode arrays for cochlear implants are susceptible to buckling during insertion, which can cause damage to nerve endings and are often stiffened with materials that may tear through the array or fail to properly curl around the modiolus.
Innovation Solution
Incorporation of flexible electrode arrays with embedded stiffeners, such as loops, undulating structures, or multi-strand elements within the flexible body to prevent buckling and control bending, ensuring the array maintains its shape and orientation during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional electrode arrays are made thin for flexible insertion, then ease of insertion is improved, but buckling resistance deteriorates
Solution Approach 1:
The electrode array incorporates stiffener members at specific locations (proximal and distal regions) rather than uniformly throughout, allowing the array to remain flexible where needed while providing localized buckling resistance. The flexible body material properties also vary along the length, with different stiffness characteristics in different regions to balance insertion ease and structural stability.
Solution Approach 2:
The electrode array is constructed as a composite structure combining a flexible body material (such as silicone rubber or polyimide) with stiffener members made of stiffer materials. This composite construction allows the array to exhibit both flexibility for insertion and sufficient rigidity to resist buckling during the procedure.
2Strength
If stiffener rods or strips are embedded to prevent buckling, then buckling resistance is improved, but damage to electrode array and wires deteriorates
Solution Approach 1:
Instead of using rigid rods or strips that can tear through the array, the patent employs flexible stiffener members that can bend and flex with the electrode array during insertion. These stiffeners are integrated within the flexible body structure, allowing them to provide support without concentrating stress at sharp points that could damage the array or embedded wires.
Solution Approach 2:
The stiffener members are designed with rounded or tapered ends and are positioned within the flexible body structure to distribute mechanical stresses before they can concentrate and cause damage. This preemptive design prevents the stiffeners from acting as stress concentrators that could tear through the electrode array or damage platinum wires during the insertion process.
3Strength
If stiffener rods or strips are embedded to prevent buckling, then buckling resistance is improved, but ability to curl around modiolus deteriorates
Solution Approach 1:
The electrode array uses regionally differentiated stiffness by placing stiffener members only in specific regions (proximal and distal) rather than uniformly throughout, and by using flexible body materials with varying properties along the length. This allows the array to maintain sufficient flexibility in intermediate regions to curl around the modiolus while providing buckling resistance at the ends where it is most needed.
Solution Approach 2:
The stiffener members are designed to be flexible rather than rigid, allowing them to adapt their shape dynamically during insertion and positioning. This dynamic flexibility enables the array to curl around the modiolus as needed while the stiffeners provide sufficient support to prevent unwanted buckling, achieving both adaptability and structural stability.
Data Source
AI summary
A cochlear including a housing, an antenna, a stimulation processor operably connected to the antenna, and an electrode array, operably connected to the stimulation processor, including a flexible body defining a longitudinal axis, a proximal region and a distal region, a plurality of electrically conductive contacts on the flexible body, and at least one stiffener within the flexible body.