Electrophysiology Sensor Base with Removable Electrodes
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Solution Overview
Problem
Existing electrophysiological analysis systems face challenges in accurately measuring skin conductance due to variability caused by electrode overvoltage, which can change over time and affect data comparability across different individuals or measurements.
Innovation Solution
A device with removable electrodes and integrated control electronics in a base unit, featuring an RFID tag to track the number of uses and ensure timely replacement, along with an infrared sensor to maintain optimal electrode temperature, reduces electrode overvoltage variability and allows for cost-effective data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is applied to electrodes for electrophysiological measurement, then electrochemical conductance data can be obtained, but oxidation reactions cause overvoltage that biases voltage measurements and degrades data quality
Solution Approach 1:
The system performs preliminary stabilization of electrode overvoltage by applying a conditioning voltage sequence before the actual measurement. This preliminary action reduces the overvoltage to a stable level, ensuring that subsequent measurements are not biased by voltage drift, thereby resolving the contradiction between obtaining conductance data and avoiding measurement degradation.
Solution Approach 2:
The system continuously monitors electrode overvoltage and adjusts the applied voltage in real-time based on feedback from voltage sensing circuits. This feedback mechanism maintains overvoltage within acceptable ranges during measurement, preventing bias in voltage measurements while still enabling electrochemical conductance data acquisition.
2Productivity
If electrodes are used repeatedly for measurements, then productivity increases, but overvoltage variability changes over time and affects data comparability
Solution Approach 1:
The system implements continuous monitoring of electrode characteristics and automatically adjusts measurement parameters based on feedback. This allows the system to maintain data quality and comparability across multiple uses by compensating for electrode wear and overvoltage drift, enabling high productivity without sacrificing reliability.
Solution Approach 2:
The system dynamically adjusts measurement parameters such as voltage amplitude and measurement timing based on electrode age and condition. By changing these parameters adaptively, the system maintains consistent measurement quality across repeated uses, ensuring data comparability while maximizing productivity.
3Measurement precision
If stable overvoltage is maintained only during measurement time, then measurement precision is improved, but overvoltage can change between measurements and affect comparability
Solution Approach 1:
The system applies preliminary stabilization voltage sequences before each measurement and maintains stabilization protocols between measurements. This extends the stable overvoltage period beyond just measurement time, ensuring consistency across multiple measurement sessions and improving both precision and duration of stability.
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 stabilizes electrode overvoltage, reduces measurement variability, and enables cost-effective, reliable electrophysiological data recording by ensuring electrodes are replaced before significant wear, thereby improving data quality and comparability.
Implementation Method 1
The voltage applied by the voltage source to the electrodes makes it possible to generate an electrophysiological current in the outer layer of the skin by electrochemical reaction at the level of the sweat glands
Implementation Method 2
The oxidation reactions cause the existence of an overvoltage at the level of the electrodes, having the effect of biasing the measurements of voltages at the level of the electrodes
Data Source
AI summary
A device for measuring electrophysiological data includes: a series of electrodes; a control circuit including a DC voltage source connected to the electrodes in order to apply, to a pair of electrodes, DC voltage pulses, and in order to connect another high-impedance electrode; and a measurement circuit for measuring the potential of the electrodes and data representative of the current passing through at least one active electrode. The device further includes at least one base incorporating the control circuit and the measurement circuit, and a housing suitable for receiving an electrode assembly which includes at least one electrode of the series in a removable manner, so as to be able to connect or disconnect the electrodes to/from the control circuit and to/from the measurement circuit.