Transformer-Based Electrical Isolation in Implantable Hearing Devices
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Solution Overview
Problem
Traditional cochlear implant systems require external components for sound processing and signal transmission, which can lead to electrical leakage and inefficiencies, and do not provide a fully implantable solution for sensorineural hearing loss.
Innovation Solution
A totally implantable cochlear implant system with a rechargeable energy source, an implant coil for charging, a stimulation decoder, and a single transformer that isolates and modifies voltage for efficient energy use, eliminating the need for external devices and reducing electrical leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional cochlear implant system with external components is used, then sound processing and signal transmission can be achieved, but electrical leakage occurs and the system is not fully implantable
Solution Approach 1:
The patent combines the external speech processor unit and implanted stimulator unit into a single totally implantable cochlear implant system. All components including the speech processor, energy source, and stimulator are integrated within the implant housing, eliminating the need for external components and transcutaneous signal transmission, thereby achieving full implantability while maintaining functionality
Solution Approach 2:
The patent introduces a transformer as an intermediary component between the energy source and the stimulator circuitry. The transformer provides electrical isolation between different circuit blocks, preventing electrical leakage while enabling voltage modification and signal transmission within the implant, thus resolving the electrical isolation requirement without compromising system integration
2Object-affected harmful factors
If external components are used for sound processing, then signal transmission is possible, but electrical leakage occurs from the electrode
Solution Approach 1:
The transformer serves as an intermediary that provides galvanic isolation between the energy source circuit and the stimulator circuit. This isolation prevents direct electrical leakage paths from the electrode to external components or other circuits, while still allowing efficient energy transfer through magnetic coupling, thus addressing both electrical leakage prevention and energy efficiency requirements
Solution Approach 2:
The patent replaces direct electrical connections with magnetic field-based energy transfer through the transformer. This substitution eliminates conductive leakage paths while maintaining energy transfer efficiency through electromagnetic induction, converting a potentially leaky electrical system into an isolated magnetic coupling system
3Device complexity
If a totally implantable system is created, then full implantability is achieved, but voltage modification and electrical isolation are required
Solution Approach 1:
The transformer is designed to perform multiple functions simultaneously: it provides electrical isolation between circuit blocks, modifies voltage levels to match different circuit requirements, and enables magnetic coupling for energy transfer. This multi-functionality reduces the overall component count and simplifies the circuit design despite the increased integration requirements of a totally implantable system
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
Enables a fully implantable solution that prevents electrical leakage, boosts voltage for effective stimulation, and allows for efficient energy use, reducing side effects and improving the reliability of sound perception for sensorineural hearing loss patients.
Implementation Method 1
The single transformer electrically isolates the implant coil from the stimulation decoder and the hearing stimulator
Implementation Method 2
The single transformer electrically isolates the implant coil from the stimulation decoder and the hearing stimulator, and modifies an output of the rechargeable energy source for use by the stimulation decoder and the hearing stimulator
Implementation Method 3
an implant coil that recharges the energy source
Data Source
AI summary
A total implantable hearing aid system is described. The system includes a single transformer that acts as an insulator between simulation circuitry and associated electrodes, and other system elements residing in the tissue. These other system elements include an RF receiver coil, a microphone system, a battery, and a digital signal processor. The transformer also increases the battery output voltage to a level needed by the simulation circuitry with electrodes.