Segmented Electrode Array for Low-Power Medical Stimulation
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Solution Overview
Problem
Medical electrical stimulation devices face challenges in efficiently delivering electrical stimulation therapy due to high power consumption and complexity associated with regulated current paths, which limits battery life and increases device size and complexity.
Innovation Solution
The use of a combination of regulated and unregulated electrodes, where regulated electrodes are coupled to regulated current paths and unregulated electrodes are coupled to a reference voltage via unregulated current paths, allowing for selective control of stimulation current and reducing power consumption by balancing current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If regulated current paths are used for all electrodes, then precise current control is achieved, but power consumption increases and device complexity increases
Solution Approach 1:
The electrode array is segmented into two functional groups: regulated electrodes (first subset) that require precise current control connected through regulated current paths, and unregulated electrodes (second subset) that serve as current return paths connected through unregulated current paths to a reference voltage. This segmentation allows the system to apply regulation only where necessary, reducing overall power consumption while maintaining therapeutic efficacy.
Solution Approach 2:
Different current path regulation characteristics are applied to different electrodes based on their functional requirements. The first subset of electrodes receives regulated current paths for precise control, while the second subset uses unregulated current paths. This local differentiation optimizes the balance between current control precision and power consumption across the electrode array.
2Measurement precision
If regulated current paths are used for all electrodes, then precise current control is achieved, but device complexity increases
Solution Approach 1:
The device architecture is segmented into regulated and unregulated current path circuits, allowing simplified unregulated paths to serve as current return routes while regulated paths provide precise control only where needed. This reduces the overall complexity of current control circuitry in the implantable device.
Solution Approach 2:
A reference voltage serves as an intermediary for the unregulated current paths, providing a stable voltage reference point that simplifies the circuit design. The unregulated current paths connect electrodes to this reference voltage, eliminating the need for complex regulated current control in these paths while maintaining system stability.
3Use of energy by moving object
If unregulated electrodes are added to balance current, then power consumption is reduced, but electrode configuration complexity increases
Solution Approach 1:
Electrodes in the second subset serve multiple functions: they act as current return paths for the regulated electrodes, provide current balancing through the unregulated current paths, and connect to the reference voltage. This multi-functionality reduces power consumption without requiring separate dedicated structures for each function.
Solution Approach 2:
The unregulated current paths automatically balance the current distribution across the electrode array by providing return paths to the reference voltage. The system self-regulates the current flow through these paths without requiring additional active control circuitry, reducing power consumption while maintaining simplicity.
Data Source
AI summary
A medical electrical stimulator provides selective control of stimulation via a combination of two or more electrodes coupled to respective regulated current paths and one or more electrodes coupled to unregulated current paths. Constant current sources may control the current that is sourced or sunk via respective regulated current paths. An unregulated current path may sink or source current to and from an unregulated voltage source that serves as a reference voltage. Unregulated electrodes may function as unregulated anodes to source current from a reference voltage or unregulated cathodes to sink current to a reference voltage.