Adjustable Hearing Aid Coupling Member for Stable Universal Fit
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Solution Overview
Problem
The variability of ear geometry across the population poses a challenge in producing a universal-fit hearing aid, leading to instability and discomfort due to improper wire length selection, which is costly and requires professional fitting.
Innovation Solution
The implementation of an adjustable coupling member that accommodates different ear geometries through various mechanisms such as spring-biased bends, telescoping sections, and shape memory alloys, allowing for customizable fit and stability without professional assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed wire length is used in conventional hearing aids, then the manufacturing process is simple, but the hearing aid becomes unstable and falls off due to improper fit for different ear geometries
Solution Approach 1:
The coupling member is designed with dynamic adjustability, allowing it to change its effective length from a first length to a second length. This enables the same coupling member to adapt to different ear geometries, resolving the contradiction between fit stability and device complexity by making the device flexible rather than fixed.
Solution Approach 2:
The coupling member's effective length parameter is made variable through adjustment mechanisms. By changing the length parameter from a fixed value to an adjustable range, the system can accommodate different ear sizes while maintaining stability, balancing reliability and complexity.
2Adaptability or versatility
If multiple wire lengths are provided to accommodate different ear geometries, then fit accuracy improves, but the device complexity and cost increase
Solution Approach 1:
A single coupling member is designed to perform multiple functions by adjusting its effective length. Instead of providing multiple separate coupling members for different ear sizes, one universal coupling member with adjustment capability serves all users, reducing complexity while maintaining adaptability.
Solution Approach 2:
The coupling member transitions from a static, fixed-length design to a dynamic, adjustable-length design. This allows one component to adapt to multiple ear geometries, achieving versatility without increasing the number of components.
3Manufacturing precision
If professional fitting and measurement are required, then fit precision is ensured, but the process becomes costly and time-consuming
Solution Approach 1:
The hearing aid system enables self-service fitting through user-adjustable coupling members. Users can modify the coupling member length themselves without requiring professional audiologists, eliminating the time-consuming professional fitting process while maintaining adequate fit precision.
Solution Approach 2:
The coupling member is pre-designed with adjustment mechanisms and guidance features that enable users to perform the fitting action themselves. The preliminary design includes all necessary adjustment capabilities built-in, eliminating the need for professional intervention during the fitting process.
4Ease of manufacture
If a universal-fit hearing aid is produced, then manufacturing cost decreases, but the hearing aid cannot accommodate the variability of ear geometry across the population
Solution Approach 1:
The coupling member incorporates dynamic adjustment features that allow it to adapt its length to match different ear geometries. This dynamic capability enables a single universal design to fit diverse users without requiring multiple specialized versions, maintaining ease of manufacture while achieving broad adaptability.
Solution Approach 2:
The effective length parameter of the coupling member is made variable through adjustment mechanisms. This parameter change capability allows one manufacturing design to serve multiple user types, achieving universality without sacrificing fit accuracy for different ear sizes.
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
Enables a cost-effective, adjustable fit hearing aid that accommodates diverse ear sizes, ensuring stability and comfort without the need for professional fitting, aligning with the emerging trend of over-the-counter hearing aids.
Implementation Method 1
The coupling member includes one or more compliant, spring-biased bends that can be straightened under tension to accommodate larger ear geometries
Implementation Method 2
The coupling member includes a pre-strained wire formed from a shape memory alloy which extends when heated to adjust the effective length of the coupling member
Data Source
AI summary
A hearing aid (600) includes an earpiece (602), a casing (604), and coupling member (612). The earpiece (602) is configured to sit at least partially within the user's ear canal when worn. The casing (604) supports a sound processor (608) and a microphone (606) and is configured to sit behind a users ear and in contact with the user's pinna when worn. The coupling member (612) couples the casing (604) to the earpiece (602). The coupling member (612) has an effective length that is adjustable to accommodate users with different ear geometries.