S-Shaped Hearing Cable With Superelastic Wire Against Kinking
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Solution Overview
Problem
Hearing device cables, particularly those for Receiver in Canal (RIC) and Behind the Ear (BTE) devices, face issues such as kinking, tension, and mismatched fit due to varying user anatomies, leading to cable/tube failure and discomfort, requiring multiple sizes and shapes for manufacturing and fitting, and affecting acoustic path consistency.
Innovation Solution
A hearing device cable with a distinct S-shape and superelastic wire, allowing flexibility to fit various ear sizes and shapes, maintaining stiffness and comfort, and minimizing kinking through a combination of materials like Kevlar and nitinol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cable is made flexible to contour along the ear, then the cable can adapt to user anatomy, but the cable becomes prone to kinking and tension failures
Solution Approach 1:
The cable incorporates a composite structure with a memory alloy core (providing shape memory and elasticity) enclosed within a flexible tubing sheath. This composite design allows the cable to be flexible enough to contour along the ear while the memory alloy core prevents permanent kinking and maintains structural integrity, resolving the contradiction between flexibility and failure resistance.
Solution Approach 2:
The cable is pre-formed with a specific curved geometry that matches the natural contours of the ear. This pre-curved shape reduces bending stresses and prevents sharp kinks that lead to failure, while still allowing the cable to flexibly adapt to individual user anatomies through its elastic memory alloy construction.
2Adaptability or versatility
If multiple sizes and shapes of hearing devices are manufactured to fit different user anatomies, then the fit and comfort are improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The hearing device is designed with a universal cable construction that can adapt to multiple ear anatomies through its memory alloy properties. Instead of manufacturing separate cables for different ear sizes and shapes, the single universal design uses the elastic and shape-memory characteristics of the alloy to conform to various user-specific contours, eliminating the need for multiple anatomical variants.
Solution Approach 2:
The cable transitions from a rigid, fixed-geometry component to a dynamic, adaptive structure. The memory alloy allows the cable to dynamically adjust its shape and curvature based on the specific ear anatomy it encounters, enabling a single design to serve multiple fitting scenarios without requiring pre-manufactured variants for each anatomy type.
3Device complexity
If the cable follows a 90 degree turn into the ear canal, then the cable routing is simplified, but the cable experiences increased tension and kinking
Solution Approach 1:
Instead of a sharp 90-degree turn, the cable is pre-formed with a gradual curved transition that guides it smoothly into the ear canal. This curved geometry distributes bending stresses along a longer radius, preventing sharp kinks and reducing tension concentrations that would lead to cable failure, while still achieving the necessary routing simplification.
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 S-shaped cable with superelastic wire provides a universal fit for both ears, reducing cable damage, enhancing comfort, and maintaining acoustic integrity, while simplifying manufacturing and fitting processes.
Implementation Method 1
The hearing device cables (or tubes) may include a superelastic wire contained therein to help define the distinct shape of the hearing device cable
Implementation Method 2
a combination of materials like Kevlar and nitinol
Implementation Method 3
a combination of materials like Kevlar and nitinol
Data Source
AI summary
A hearing device cable including a body portion is described herein. The body portion may extend between a first end region and a second end region along a tube centerline. The body portion may include a first radial portion proximate the first end region and second radial portion proximate the second end region. The first radial portion may define a radius of curvature that is greater than or equal to a radius of curvature defined by the second radial portion. The tube centerline may lie along an x-y plane between the first and second end regions. In one or more embodiments, the body portion may define a passageway extending between the first and second end regions. Further, the hearing device cable may include a superelastic wire within the passageway extending between the first and second end regions.