Runtime Adaptive RF Power Control for Cochlear Implants
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Solution Overview
Problem
Conventional cochlear implant systems require time-consuming and inconvenient calibration procedures to determine optimal RF power levels, which can be inaccurate due to varying factors like headpiece alignment and skin thickness, leading to inefficiencies and delays in startup and operation.
Innovation Solution
Implementing a runtime adaptive RF power control system that dynamically adjusts power levels based on actual audio content and real-time conditions, eliminating the need for dedicated calibration and allowing continuous optimization of power use models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional one-time power calibration procedures are used at system startup, then initial power levels can be set, but startup delays occur and power levels become inaccurate due to varying factors like headpiece alignment and skin thickness
Solution Approach 1:
The system transitions from static one-time calibration to dynamic runtime adaptive power control. The RF power level is continuously adjusted based on real-time feedback from the cochlear implant device, allowing the system to adapt to changing conditions such as headpiece alignment and skin thickness variations without requiring repeated calibration procedures.
Solution Approach 2:
A feedback mechanism is implemented where the cochlear implant device communicates power consumption information back to the external RF transmitter. This feedback loop enables the transmitter to automatically adjust RF power levels to match actual power needs, eliminating the need for time-consuming calibration procedures while maintaining accurate power delivery.
2Reliability
If RF power is provided at a high power level to ensure sufficient stimulation, then power sufficiency is achieved, but battery life is reduced and heat generation increases
Solution Approach 1:
The system uses feedback from the cochlear implant device regarding actual power consumption to dynamically adjust RF power transmission levels. This ensures that sufficient power is delivered for proper stimulation while avoiding excessive power transmission that would waste battery energy and generate unwanted heat.
Solution Approach 2:
The RF power transmission parameters are dynamically changed based on real-time conditions and actual power needs of the cochlear implant. The system adjusts power levels continuously rather than maintaining a fixed high power level, optimizing the balance between power sufficiency and energy efficiency.
3Loss of energy
If RF power is provided at a low power level to conserve battery life, then energy efficiency is improved, but stimulation quality deteriorates
Solution Approach 1:
The feedback mechanism ensures that the RF transmitter delivers the minimum necessary power to maintain quality stimulation by continuously monitoring actual power consumption and delivery conditions. This prevents both under-powering (which would degrade stimulation quality) and over-powering (which would waste energy).
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 reduces startup delays, ensures efficient battery usage, maintains optimal power levels, and provides consistent sound perception without the need for recalibration, enhancing the overall performance and convenience of cochlear implant systems.
Implementation Method 1
RF power may be delivered by way of inductive coupling of an external coil associated with the RF transmitter and an internal coil associated with the cochlear implant
Data Source
AI summary
An illustrative radio frequency (RF) power control system includes an RF transmitter configured to operate external to a recipient, a cochlear implant configured to operate internal to the recipient based on RF power received from the RF transmitter, and a processor that, while operating in a power adaptation mode during which the cochlear implant applies stimulation to the recipient: 1) receives an audio signal, 2) directs the RF transmitter to provide the RF power to the cochlear implant at a power level determined based on the audio signal and based on a power level mapping function, 3) determines an error value representing a difference between a target metric and a measured metric associated with receipt of the RF power at the cochlear implant, and 4) updates the power level mapping function based on the error value. Corresponding systems and methods are also disclosed.