Elastomeric Stabilizer for Cochlear Implant Carrier Buckling
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Solution Overview
Problem
Therapeutic element assemblies for medical devices, such as cochlear implants, face challenges with flexibility, as overly flexible designs can buckle during insertion, causing trauma to anatomical structures, while traditional stiffeners lead to sudden changes in stiffness and potential deformation.
Innovation Solution
Incorporating an elastomeric stabilizer with varying hardness along the length of the carrier, made from a material similar to the therapeutic element assembly, provides controlled stiffness distribution, reducing the risk of buckling and deformation, and allowing for smoother insertion and contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carrier is made flexible to ease insertion, then ease of operation is improved, but the carrier may buckle during insertion causing trauma to anatomical structures
Solution Approach 1:
The patent applies local quality by embedding a stabilizer only in the proximal region of the carrier, leaving the distal region flexible. The stabilizer has a hardness between 40-80 durometer, different from the carrier material, creating a localized stiffened section that prevents buckling during insertion while allowing the distal therapeutic elements to remain flexible for safe anatomical adaptation
2Reliability
If traditional stiffeners are used to prevent buckling, then reliability is improved, but sudden changes in stiffness occur causing deformation
Solution Approach 1:
The patent changes the material parameter (hardness) of the stabilizer relative to the carrier, selecting a durometer range of 40-80 that provides gradual stiffness transition. This parameter optimization allows the stabilizer to resist buckling forces while the elastomeric material properties enable smooth stress distribution, preventing sudden stiffness changes and deformation
3Strength
If metal stiffeners are used to provide structural support, then strength is improved, but device complexity increases due to insulation requirements
Solution Approach 1:
The patent substitutes metal stiffeners with an elastomeric stabilizer made of polymer material. This material substitution eliminates the need for electrical insulation that would be required with conductive metal stiffeners, reducing device complexity while maintaining structural support capability through the elastomeric material's mechanical properties
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 elastomeric stabilizer enhances the durability and control over stiffness distribution, minimizing trauma during insertion and ensuring consistent contact pressure, while being easier to manufacture and non-conductive, reducing the need for additional insulation.
Implementation Method 1
The stabilizer comprises an elastomeric material... configured to decrease flexibility of the proximal region so as to resist deformation of the proximal region during introduction of the flexible elongate carrier into the recipient
Data Source
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AI summary
Examples disclosed herein are relevant to a therapeutic element assembly having a carrier configured to introduce one or more therapeutic elements into a recipient. A stabilizer is permanently embedded in and longitudinally extends through at least a first region of the carrier. The stabilizer is configured to decrease the flexibility of the carrier so as to resist deformation of said first region during implantation into the recipient. The stabilizer is formed from an elastomeric material.