Smart Charger Alignment Indicator for Implantable Pulse Generators
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Solution Overview
Problem
Current external charger systems for implantable pulse generators require patients to continuously monitor alignment indicators, leading to sub-optimal charging rates due to inappropriate misalignment tone triggers, especially for deeper implants, necessitating an improved method for indicating alignment or misalignment.
Innovation Solution
The system adjusts a threshold for a charge strength indicator based on detected electrical parameters, such as steady-state voltage, to generate user-discernible signals only when misalignment occurs, allowing for tailored alignment feedback specific to the implant depth, using a processor to modify threshold values automatically or manually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed misalignment threshold is used for all implant depths, then the alignment indicator can be simple and easy to implement, but deeper implants will trigger misalignment tones inappropriately and patients must continuously monitor the indicator
Solution Approach 1:
The patent implements dynamic threshold adjustment where the misalignment detection threshold is no longer fixed but adapts based on detected charge rates. The system automatically modifies the threshold value during charging operations, allowing the alignment indicator to accommodate varying implant depths and tissue characteristics without requiring continuous patient monitoring or complex pre-programming.
Solution Approach 2:
The alignment indicator system performs self-adjustment by automatically detecting charge rates and modifying its own threshold values without external intervention. The controller continuously monitors charging parameters and autonomously adapts the misalignment detection criteria, eliminating the need for patients to manually adjust settings or continuously monitor the indicator.
2Ease of operation
If the alignment indicator provides continuous feedback, then patients can maintain optimal alignment, but this requires constant patient attention and leads to sub-optimal charging due to inappropriate misalignment tone triggers
Solution Approach 1:
The system transitions from continuous feedback to periodic assessment by evaluating alignment only at specific intervals during the charging process. The controller checks charge rates at defined periods and triggers misalignment tones only when sustained sub-optimal charging is detected, reducing unnecessary patient attention requirements while maintaining effective alignment monitoring.
Solution Approach 2:
The patent implements intelligent feedback mechanisms where the alignment indicator provides selective rather than continuous feedback. The system monitors charge rates continuously but triggers user alerts only when misalignment conditions are confirmed, optimizing the balance between providing necessary guidance and avoiding unnecessary patient intervention.
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 ensures that the user is alerted only when the charge rate is sub-optimal, preventing unnecessary misalignment tones and optimizing charging efficiency for varying implant depths, thereby improving the alignment process and charging efficiency.
Implementation Method 1
efficient power transmission through tissue from the external charger to the implanted pulse generator via inductive coupling
Data Source
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AI summary
Electrical energy is transmitted to charge the implanted medical device, and an electrical parameter (e.g., a steady-state voltage) indicating a rate at which the implanted medical device is charged by the electrical energy is detected. A threshold (e.g., by modifying a stored threshold value) at which the charge strength indicator generates a user-discernible signal is adjusted based on the detected electrical parameter.