Brain Stimulation System Impedance Control
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Solution Overview
Problem
Existing electrical brain stimulation systems face challenges in safely delivering stimulation when electrode adherence is compromised, leading to potential for excessive energy delivery and adverse effects on the subject.
Innovation Solution
An electrical brain stimulation system comprising detachable electrodes, a power supply, and a control unit that adjusts energy delivery based on impedance variations to prevent excessive energy supply, using impedance detecting elements and voltage/current limiting units to ensure safe operation even if part of an electrode is not well adhered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrodes are supplied with electric power for brain stimulation, then the stimulation effect is improved, but the risk of excessive energy delivery increases when electrode adherence is compromised
Solution Approach 1:
The system continuously monitors impedance at the electrode-subject interface and uses this feedback to dynamically adjust power delivery. When impedance changes indicate poor adherence or disconnection, the control unit responds by limiting or terminating power supply, preventing excessive energy delivery while maintaining effective stimulation when electrodes are properly attached
Solution Approach 2:
The power supply parameters (voltage, current, power) are made dynamically adjustable based on real-time impedance measurements. The system transitions between different power delivery states (normal stimulation, limited power, terminated) according to adherence conditions, enabling safe operation across varying electrode-contact scenarios
2Reliability
If the system limits energy delivery to prevent adverse effects, then safety is improved, but the stimulation effectiveness may be reduced
Solution Approach 1:
The system changes electrical parameters (voltage, current, power limits) based on impedance measurements to optimize both safety and effectiveness. When electrodes are properly adhered, full therapeutic parameters are delivered; when adherence is poor, parameters are automatically adjusted to safe levels, preventing harm while maintaining maximum effective stimulation when conditions permit
3Reliability
If the system continuously monitors impedance to detect adherence issues, then safety control is improved, but the device complexity increases
Solution Approach 1:
The impedance measurement circuit serves multiple functions: it characterizes the electrode-subject interface, detects adherence quality, triggers safety responses, and enables adaptive power delivery. This multi-functionality allows comprehensive safety monitoring without adding separate dedicated sensors or systems, thereby limiting the increase in device complexity
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
The system ensures safe and controlled energy delivery to the brain, preventing abnormal energy increases and improving adherence by gradually increasing voltage/current, thus ensuring safe stimulation and terminating when energy limits are reached.
Implementation Method 1
a control unit configured to control the electric power to be supplied to the electrodes, based on an impedance variation of the electrodes
Data Source
AI summary
An electrical brain stimulation system includes at least two electrodes configured to be adhered to a subject, a power supply configured to supply electric power to the electrodes, and a control unit configured to control the electric power to be supplied to the electrodes by limiting at least one of a variation and a maximum of energy of the electric power.