Earpiece Fitting System Using Shape Memory Material
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Solution Overview
Problem
Earpieces face challenges in maintaining a secure fit within the ear canal or concha, which affects sound quality and the effectiveness of electrical signal delivery and reception, particularly for applications like vagus nerve stimulation, due to inconsistent skin contact.
Innovation Solution
A fitting system that includes a support structure with electrodes to measure impedance and a controller that adjusts the earpiece's fit by using shape memory materials or expansion mechanisms to ensure optimal contact with the skin, ensuring a stable and comfortable fit by moving the earpiece support structure until impedance reaches a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the earpiece support structure is made rigid to maintain stable contact with the ear canal/concha, then the fit stability is improved, but the adaptability to different ear shapes and sizes deteriorates
Solution Approach 1:
The support structure transitions from a static rigid form to a dynamic adaptive form through shape memory material that can change its shape in response to thermal stimuli, allowing it to adapt to different ear geometries while maintaining contact stability
Solution Approach 2:
The physical parameters of the support structure (shape, volume) are changed by applying thermal energy through resistive heating of the shape memory material, enabling the structure to conform to different ear canal and concha geometries
2Reliability
If the earpiece support structure is made expandable to improve contact with the ear canal/concha, then the fit security is improved, but the device complexity increases
Solution Approach 1:
The mechanical expansion system is replaced with a smart material-based system where shape memory material inherently provides the expansion force through thermal actuation, eliminating the need for complex mechanical actuators, springs, or motors
Solution Approach 2:
The shape memory material autonomously expands and contracts in response to thermal stimuli without requiring external mechanical control systems, making the expansion mechanism self-regulating and simpler in design
3Reliability
If the electrodes are made larger to improve electrical signal contact quality, then the signal transmission quality is improved, but the comfort and fit in the ear canal deteriorates
Solution Approach 1:
The support structure provides localized pressure and contact force precisely at the electrode-skin interface through shape memory material deformation, ensuring good electrical contact without requiring large electrode surfaces that would discomfort the user
Solution Approach 2:
The support structure pre-positions and pre-presses the electrodes against the skin before signal transmission begins, ensuring optimal contact quality is achieved automatically as the earpiece is inserted and the shape memory material activates
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 system achieves a secure and comfortable fit, enhancing sound quality and electrical signal transmission while maintaining user comfort by dynamically adjusting the earpiece's position based on impedance measurements.
Implementation Method 1
The earpiece support structure may comprise shape memory material that is configured to change shape upon the application of a stimulus
Implementation Method 2
The shape memory material may be electrically conductive, in which case the stimulus can be resistive heating
Implementation Method 3
circuitry that is configured to determine an impedance between the first and second electrodes
Implementation Method 4
The controller may be configured to control an application of electrical current to the shape memory material, to cause heating of the shape memory material
Implementation Method 5
The earpiece support structure may be configured to expand. The earpiece support structure expansion may be radial
Data Source
AI summary
A fitting system for an earpiece that comprises a support structure that is configured to contact at least one of the ear canal or the concha of an ear of a user, including at least first and second spaced electrodes that are each configured to contact the user's skin, circuitry that is configured to determine an impedance between the first and second electrodes, and a controller, responsive to the determined impedance, for causing the earpiece support structure to move.