Elastic Seal for Hearing Aid Receiver Snap-Fit Feedback
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Solution Overview
Problem
Hearing aid receiver units experience feedback issues, particularly at higher amplifications, due to sound leakage through the snap-fit connection between the ear mold and the receiver, which is exacerbated by manufacturing tolerances and repeated wear.
Innovation Solution
An ear mold with a receiver connector featuring a snap-fit element and an adapter, where a seal made of a more elastic material than the connector and adapter surrounds the connection, providing a sealing effect to prevent sound leakage and protect the receiver from cerumen, dirt, and sweat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a snap-fit connection is used between the ear mold and receiver, then the receiver can be easily inserted and removed, but sound leakage occurs through the connection gap causing feedback at high amplifications
Solution Approach 1:
A seal element is introduced as an intermediary component between the receiver connector and the ear mold. This seal prevents sound leakage through the snap-fit connection gap while allowing the connection to remain easily insertable and removable. The seal acts as a mediator that eliminates the harmful sound leakage without compromising the ease of operation.
Solution Approach 2:
The seal element is made from an elastic material that forms a flexible barrier between the receiver connector and ear mold. This flexible seal conforms to the connection interface and prevents sound leakage while maintaining the snap-fit connection's ease of insertion and removal. The elastic material allows the seal to adapt to minor variations in the connection geometry.
2Ease of manufacture
If the snap-fit connection is made with standard materials, then manufacturing is simple, but manufacturing tolerances cause gaps that lead to sound leakage
Solution Approach 1:
The seal element is made from an elastic material with different mechanical properties than the rigid connector and ear mold materials. This parameter change allows the seal to compensate for manufacturing tolerances and connection gaps that would otherwise cause sound leakage. The elastic material can deform to fill gaps created by tolerance variations.
Solution Approach 2:
The connection system uses a composite structure combining rigid materials (receiver connector and ear mold) with an elastic seal material. This composite approach allows the rigid components to provide structural integrity while the elastic seal compensates for manufacturing tolerances and prevents sound leakage through the connection interface.
3Adaptability or versatility
If receivers are replaced repeatedly in the mold, then adaptability to different receivers is improved, but wear increases connection gaps causing feedback
Solution Approach 1:
The seal element is designed to be dynamically adaptable to wear and repeated insertion/removal cycles. The elastic material can deform and recover, maintaining effective sealing even as the connection interface wears over time. This dynamic property allows the seal to compensate for wear-induced gaps that would otherwise cause feedback.
Solution Approach 2:
The elastic seal element provides beforehand cushioning against the harmful effects of wear and repeated use. By anticipating and compensating for wear-induced gaps before they cause feedback problems, the seal maintains reliable feedback suppression throughout the product's service life despite repeated receiver replacements.
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 effectively suppresses feedback even at high amplifications, extends the service life of components, and allows for the use of receivers with greater amplification, while being easily replaceable, ensuring long-term sealing and protection.
Implementation Method 1
a seal (13), which surrounds the receiver connector (19) completely, is made of a more elastic material than the receiver connector (19) and the adapter (12)
Data Source
AI summary
When external receivers are used in hearing devices there is a need to suppress feedback further. An ear mold with a receiver is therefore proposed, having a receiver connector including a first snap-fit element at the sound outlet. An adapter is inserted directly into the ear mold and has a second snap-fit element, which is snapped into the first snap-fit element in a manner such that it can be released. A seal, which surrounds the receiver connector completely, is made of a more elastic material than the receiver connector and the adapter and is fitted between the receiver connector and the adapter. It is thus possible to secure the receiver in the ear mold in an acoustically sealed manner, so that there is less feedback. The seal however also ensures that less dirt reaches the receiver.