Flexible Cable Assembly Reducing Mechanical Feedback in Hearing Aids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior hearing aids experience mechanical feedback issues due to stiff electrical cables connecting the in-the-ear (ITE) and behind-the-ear (BTE) components, causing undesirable vibrations and feedback to the user.
Innovation Solution
A flexible cable assembly with a stiffness of no more than 7.0 Taber stiffness units, comprising woven wires like Litz wires, is used to connect the ITE and BTE components, minimizing vibration conduction and feedback by reducing the cable's stiffness and incorporating vibration attenuating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stiff electrical cable is used to connect the ITE and BTE components, then electrical connection reliability is improved, but mechanical feedback and vibrations increase
Solution Approach 1:
The patent applies this principle by replacing the stiff cable with a flexible cable assembly that has low stiffness (no more than 7.0 Taber stiffness units). The flexible cable assembly includes a flexible cable portion with vibration attenuating materials that reduce mechanical feedback while maintaining electrical connection. This directly addresses the contradiction by using flexibility to reduce harmful vibrations while preserving the electrical connection function.
Solution Approach 2:
The patent applies this principle by incorporating vibration attenuating materials within the flexible cable assembly. These composite materials are designed to dampen vibrations and reduce mechanical feedback between the ITE and BTE components, while the cable assembly maintains sufficient electrical conductivity. The composite structure allows the cable to simultaneously provide electrical connection and reduce mechanical feedback.
2Object-generated harmful factors
If a flexible cable is used to reduce mechanical feedback, then vibration conduction is reduced, but cable stiffness decreases
Solution Approach 1:
The patent applies this principle by precisely controlling the stiffness parameter of the cable assembly to be no more than 7.0 Taber stiffness units. This parameter change optimizes the balance between flexibility (to reduce vibration conduction) and sufficient structural integrity (to maintain basic cable strength). The specific stiffness threshold represents an optimized parameter that resolves the contradiction between flexibility and strength.
3Object-generated harmful factors
If vibration attenuating materials are incorporated in the cable assembly, then mechanical feedback is reduced, but device complexity increases
Solution Approach 1:
The patent applies this principle by merging the vibration attenuation function directly into the cable assembly structure itself, rather than adding separate vibration isolation components. The vibration attenuating materials are integrated within the cable assembly, combining multiple functions (electrical connection and vibration reduction) into a single integrated component. This reduces overall device complexity while achieving the desired vibration reduction.
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 flexible cable assembly significantly reduces mechanical feedback, enhancing sound perception and comfort for hearing aid users by minimizing unwanted vibrations, particularly effective in bone conduction hearing aids.
Implementation Method 1
The cable assembly includes a first connector for electrically connecting to the output port of the first component, a second connector for electrically connecting to the input port of the second component and a flexible cable portion for electrically connecting the first connector to the second connector. The cable portion has a stiffness of no more than about 7.0 Taber stiffness units.
Data Source
AI summary
An electronic hearing aid apparatus comprises a first component, a second component and a cable assembly for electrically connecting the first component to the second component. The first component includes a vibration sensor for sensing acoustic vibrations and generating a vibration signal based on the sensed acoustic vibrations, electronics for processing and amplifying the vibration signal and an output port for providing access to the amplified vibration signal. The second component includes an input port for receiving the amplified vibration signal and a vibration generator for generating vibrations based on the amplified vibration signal. The cable assembly conducts the amplified vibration signal from the output port of the first component to the input port of the second component. The cable assembly includes a first connector for electrically connecting to the first component, a second connector for electrically connecting to the second component and a flexible cable portion for electrically connecting the first connector to the second connector. In some embodiments, the cable portion has a stiffness of no more than about 7.0 Taber stiffness units. In one most preferred embodiment, the cable portion has a stiffness of no more than about 1.0 Taber stiffness unit.