Transcranial Stimulation Electrode Impedance Control
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Solution Overview
Problem
Current transcranial current stimulation technologies lack assurance of safety, accuracy, and efficiency due to the absence of impedance measurement with respect to the skin, leading to potential risks and inefficiencies.
Innovation Solution
An electrode with a current delivering unit that estimates and analyzes contact impedance, distributing current effectively across pins to ensure safe and accurate stimulation, incorporating safety triggers, amplifiers, analog-to-digital converters, digital signal processors, and communication units for real-time adjustments and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transcranial current stimulation is applied without impedance measurement, then the device complexity is reduced, but safety and accuracy cannot be guaranteed
Solution Approach 1:
The system performs preliminary impedance measurement and analysis before current delivery to identify suitable pins and assess skin contact quality. This preliminary action ensures safety criteria are met before stimulation begins, resolving the contradiction by establishing reliability prerequisites without requiring continuous complex monitoring during the actual stimulation process.
Solution Approach 2:
The system measures contact impedance and uses this feedback information to automatically select appropriate pins and adjust current distribution. The feedback mechanism enables the system to adapt to varying skin conditions while maintaining safety, thereby improving reliability without proportionally increasing device complexity through intelligent control algorithms.
2Manufacturing precision
If impedance analysis is performed for each pin, then accuracy of current distribution is improved, but measurement and processing complexity increases
Solution Approach 1:
The system automatically performs impedance measurement, analysis, and pin selection without requiring manual intervention. The automated self-service approach handles the complex measurement and processing tasks through integrated algorithms, improving current distribution accuracy while keeping the user interface simple and the overall system complexity manageable.
Solution Approach 2:
The system changes measurement parameters adaptively based on skin conditions and pin characteristics. By adjusting measurement frequencies, thresholds, and selection criteria dynamically, the system achieves high current distribution accuracy without requiring equally complex fixed measurement protocols for all pins.
3Reliability
If safety triggers are implemented for each pin, then safety is enhanced, but device complexity increases
Solution Approach 1:
The safety monitoring function is segmented and distributed across individual pin controllers rather than implemented as a centralized complex safety system. Each pin has its own safety trigger that independently monitors and responds to impedance changes, providing enhanced safety through modular design while actually reducing overall device complexity compared to a centralized approach.
Data Source
AI summary
An electrode (10) for transcranial current stimulation is provided. The electrode (10) comprises at least two pins (11a, 11b) for contacting the skin of a living or human being, and a current delivering unit (12) connected to the at least two pins (11a, 11b). The current delivering unit (12) is configured to estimate the corresponding range of the respective contact impedance with respect to the skin for each of the at least two pins (11a, 11b) or to analyze the corresponding level of the respective contact impedance with respect to the skin for each of the at least two pins (11a, 11b). The current delivering unit (12) is configured to distribute a desired current over all of the at least two pins (11a, 11b) or to select a set of the at least two pins (11a, 11b) for delivering a set of partial currents in order to achieve the desired current.