Implantable EEG Electrode Testing Circuit for Leakage Detection
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Solution Overview
Problem
Implanted EEG monitors face challenges in ensuring that electrodes maintain proper electrical connections and do not leak current into the body, which is crucial for accurate brain activity monitoring and safety, as existing technologies lack effective fault detection and current leakage management.
Innovation Solution
A personal wearable EEG monitor with an implantable electrode part that includes a testing circuit with a capacitor and test signal generator to identify faults, such as broken electrodes or excessive current leakage, using a digital signal processing unit and inductive coupling for data and power transfer, and a method involving signal analysis to detect leak currents through logarithmic transformation and filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If implanted electrodes are used for continuous EEG monitoring, then portability and continuous monitoring capability are improved, but the risk of current leakage into tissue and electrode faults increases
Solution Approach 1:
The system performs preliminary testing of electrodes and leakage current detection before continuous monitoring begins. The test signal generator activates electrodes in a controlled sequence, measuring impedance and detecting faults before the electrodes are used for actual EEG recording, preventing potential harm from undetected electrode failures
Solution Approach 2:
The system continuously monitors electrode impedance and leakage current during operation. The controller receives feedback signals from the electrodes through the amplifier and actively adjusts or alerts when abnormal conditions are detected, enabling real-time detection of electrode faults and current leakage beyond safe thresholds
2Object-affected harmful factors
If DC-blocking capacitors are used to prevent current leakage, then safety is improved, but the ability to detect electrode faults and capacitor failures becomes more difficult
Solution Approach 1:
The system periodically applies test signals through the DC-blocking capacitors to detect faults. By alternating between normal EEG recording mode and test signal injection mode, the system can assess capacitor integrity and electrode connectivity without continuous interference, enabling fault detection while maintaining safety through the blocking capacitors
Solution Approach 2:
The system uses test signal generators and controlled switching circuits as intermediaries to indirectly assess the condition of DC-blocking capacitors and electrodes. Rather than directly measuring capacitor health, the system injects test signals and analyzes the resulting responses, allowing fault detection without compromising the protective function of the capacitors
3Reliability
If multiple testing functions are added to detect faults and leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The system uses a single test signal generator that can perform multiple testing functions by varying test signal parameters. The same hardware circuitry is used for impedance measurement, leakage current detection, and electrode fault identification, reducing overall device complexity while maintaining comprehensive testing capabilities through software-controlled signal variations
Solution Approach 2:
The system combines fault detection, leakage current monitoring, and EEG recording functions into an integrated architecture. The amplifier, controller, and test signal generator work as a unified system where the same signal paths and processing circuits serve both diagnostic and monitoring purposes, minimizing the need for separate dedicated circuits for each function
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 solution enables reliable detection of electrode faults and current leaks, ensuring safe operation by preventing excessive current flow and maintaining accurate EEG signal measurement, thereby enhancing the reliability and safety of the EEG monitoring system.
Implementation Method 1
A capacitor may be coupled in serial connection to at least one electrode. The capacitor may be a DC-blocking capacitor, i.e. a capacitor having the function of blocking direct current (DC)
Implementation Method 2
inductive coupling for data and power transfer
Data Source
AI summary
A personal wearable EEG monitor comprising an implantable electrode part with at least two electrodes (2,3) for measuring an EEG signal of a person. The electrode part comprises an electronic circuit arranged in a housing (1) with each electrode arranged external to the housing. The electrode part comprises a testing circuit for testing functionality of the electrode part. The testing circuit comprises a capacitor (9) coupled in serial connection to at least one of the electrodes, and a test signal generator for providing a test signal. The EEG monitor is adapted for analyzing the signal resulting from the signal generator for identification of faults in the electrode part. The invention further provides a method for detecting a leak current in an implanted EEG monitor part.