Photostrictive Tympanic Membrane Transducer for Feedback-Free Hearing
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Solution Overview
Problem
Conventional hearing aids and earpieces face issues such as size and aesthetic concerns, feedback problems, inadequate acoustic coupling, and the need for surgical implantation, which affect the quality and comfort of sound transmission.
Innovation Solution
The use of light signals to induce vibrational energy in the hearing transduction pathway by converting ambient or electronic sound signals into light, which is then converted back into mechanical vibrations using opto-accoustic or photomechanical systems, eliminating the need for direct acoustic coupling and reducing the risk of feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic transducers are used to produce amplified sound waves, then sound transmission is achieved, but feedback problems occur and acoustic coupling is inadequate
Solution Approach 1:
The patent replaces the acoustic transducer system with a photomechanical system. Light from a source passes through a modulator driven by an audio signal, and the modulated light strikes a photostrictive material on the tympanic membrane, causing direct mechanical vibration without acoustic amplification, thereby eliminating feedback problems
Solution Approach 2:
The patent introduces light as an intermediary between the audio signal and the tympanic membrane. The audio signal modulates the light intensity, which then acts on the photostrictive material to produce mechanical vibration, serving as a non-acoustic coupling mechanism that avoids traditional feedback issues
2Shape
If hearing aids are made smaller for aesthetic purposes, then cosmetic appearance improves, but acoustic coupling and sound quality deteriorate
Solution Approach 1:
The patent replaces the acoustic coupling mechanism with a photomechanical coupling system. Instead of relying on acoustic transducers that require adequate space for proper coupling, the system uses light transmission through a small earpiece to activate a photostrictive material directly on the tympanic membrane, enabling effective operation in compact form factors
Solution Approach 2:
The patent transitions from acoustic wave propagation (three-dimensional sound field) to light transmission (collimated optical path) and direct photostrictive conversion (surface-level activation). This dimensional shift allows the system to achieve effective coupling through a much smaller aperture in the ear canal
3Reliability
If surgical implantation is used, then transducer coupling to middle ear is improved, but device complexity and invasiveness increase
Solution Approach 1:
The patent employs a support structure with adhesive properties that enables the transducer assembly to self-adhere to the tympanic membrane. The support structure includes an adhesive layer that bonds to the eardrum surface, allowing the device to be applied without surgical intervention while maintaining secure coupling
Solution Approach 2:
The patent introduces an adhesive support structure as an intermediary between the transducer assembly and the tympanic membrane. This support structure provides mechanical coupling and positioning without requiring surgical implantation, serving as a non-invasive interface that maintains reliable transducer coupling
4Use of energy by moving object
If transcutaneous electrical connections are used, then power delivery is achieved, but reliability and comfort decrease due to skin penetration requirements
Solution Approach 1:
The patent replaces the electrical power delivery system with an optical power transmission system. A light source in the external earpiece transmits modulated light through the ear canal to a photostrictive material on the tympanic membrane, delivering both power and audio signal without transcutaneous electrical connections
Solution Approach 2:
The patent uses modulated light to simultaneously perform multiple functions: it delivers power to the photostrictive transducer and carries the audio signal information. This multi-functionality eliminates the need for separate power and signal pathways, removing the requirement for transcutaneous electrical connections while maintaining reliable energy and information delivery
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
This approach provides efficient energy transfer, minimizes custom manufacturing, and enhances comfort and battery life, while avoiding the need for surgical implantation and transcutaneous connections, offering improved sound quality and reduced manufacturing costs.
Implementation Method 1
systems and methods for photo-mechanical hearing transduction... use of light signals for producing vibrational energy in a transduction pathway
Implementation Method 2
A particularly suitable photostrictive ceramic is composed with a solid solution of lead titanate and lead zirconate, referred to as PLZT. PLZT displays both a piezoelectric effect and a photovoltaic effect so that it produces mechanical strain when irradiated by light, referred to as a photostrictive effect.
Data Source
AI summary
Hearing systems for both hearing impaired and normal hearing subjects comprise an input transducer and a separate output transducer. The input transducer will include a light source for generating a light signal in response to either ambient sound or an external electronic sound signal. The output transducer will comprise a light-responsive transducer component which is adapted to receive light from the input transducer. The output transducer component will vibrate in response to the light input and produce vibrations in a component of a subject's hearing transduction pathway, such as the tympanic membrane, a bone in the ossicular chain, or directly on the cochlea, in order to produce neural signals representative of the original sound.