Electrode Contact Quality Evaluation Circuitry
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Solution Overview
Problem
The quality of electrode contact with the skin surface in medical instruments like electrocardiographs is often poor due to inadequate skin preparation and improper electrode application, leading to increased susceptibility to interference and reduced signal quality.
Innovation Solution
An instrument with electrode contact quality evaluation circuitry that uses a test current to assess the impedance between electrodes and the skin, providing feedback on connection quality and inhibiting instrument operations until satisfactory contact is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual or physical inspection of electrodes is performed, then ease of operation is improved, but measurement precision of connection quality deteriorates
Solution Approach 1:
The patent replaces manual visual or physical inspection of electrode connections with an automated electrical measurement system. The instrument automatically applies test currents and measures impedance to objectively assess connection quality, eliminating the subjectivity and imprecision of human inspection while maintaining ease of operation through automated feedback indicators.
2Reliability
If electrode contact quality evaluation circuitry is added, then reliability of electrical connection is improved, but device complexity increases
Solution Approach 1:
The patent combines the electrode contact quality evaluation circuitry with the existing lead interface unit and instrument electronics. The impedance measurement functions are integrated into the same hardware that processes patient signals, sharing common components such as the microprocessor, display interface, and electrode connections. This merging approach adds reliability through automated monitoring while minimizing the increase in overall device complexity through component sharing and integration.
3Measurement precision
If impedance measurement is performed to assess connection quality, then measurement precision of connection quality is improved, but use of energy increases
Solution Approach 1:
The patent implements periodic impedance measurements rather than continuous monitoring. The evaluation circuitry performs resistance or impedance measurements at scheduled intervals during instrument operation, allowing the system to maintain measurement precision for connection quality assessment while significantly reducing overall energy consumption compared to continuous real-time monitoring. The measurements are triggered by specific events or time intervals, optimizing the balance between accuracy and power usage.
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
Ensures reliable and high-quality electrical connections between electrodes and the skin, reducing interference and improving signal integrity in medical instruments.
Implementation Method 1
the evaluation circuitry determines a quality of electrical connections between the surface contact electrodes and a skin surface
Data Source
AI summary
An instrument that utilizes body contact electrodes evaluates the quality of the connections made between the electrodes and the body. An electrode contact quality evaluation circuit performs the quality evaluation, such as by determining contact impedances for the electrodes. The corresponding contact quality of each electrode is conveyed to the user.