Portable ECG Sensor Switching Circuit for Polarization Reduction
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Solution Overview
Problem
Traditional ECG measurement methods using portable sensor devices face challenges such as messy procedures, the need for conductive gel, and difficulties in accurately capturing electric signals due to electrode polarization and mechanical artefacts, which complicate signal extraction and analysis.
Innovation Solution
A portable sensor device with two or three electrodes and a processor-controlled switch system that equalizes electrode voltages by closing and then blocking connections, allowing for efficient capture of ECG measurements without conductive gel, reducing artefacts and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ECG measurement methods are used with multiple electrodes and conductive gel, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent removes conductive gel from the measurement system, extracting the problematic element that caused messiness and application complexity while maintaining acceptable ECG signal quality through optimized electrode design and switching circuitry
Solution Approach 2:
The patent introduces a switching mechanism as an intermediary between the electrodes and measurement circuitry, enabling rapid connection and disconnection of electrodes to eliminate the need for conductive gel and reduce measurement time
2Ease of operation
If portable sensor devices are used without conductive gel, then ease of operation is improved, but measurement precision deteriorates due to electrode polarization and mechanical artefacts
Solution Approach 1:
The patent employs periodic switching between measurement and polarization compensation phases, rapidly alternating between capturing ECG signals and compensating for electrode polarization effects, thereby maintaining signal accuracy in portable devices
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors electrode-p skin interface conditions and dynamically adjusts measurement parameters to compensate for polarization and mechanical artefacts, maintaining precision in portable applications
3Measurement precision
If measurement time is extended to capture complete ECG cycles, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent performs preliminary polarization compensation and electrode stabilization before the actual ECG measurement begins, pre-conditioning the measurement system so that complete ECG cycles can be captured immediately without extended setup time
Solution Approach 2:
The patent rushes through the measurement process by using rapid switching to capture complete ECG cycles in compressed time frames, skipping the traditional lengthy setup and stabilization phases through automated pre-conditioning
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 significantly reduces electrode polarization and mechanical artefacts, making it easier to extract accurate ECG signals, enhancing the convenience and reliability of ECG data capture.
Implementation Method 1
setting at least one switch in a conducting state to close a connection between the two electrodes; setting the at least one switch in a blocking state to conductively separate the two electrodes
Data Source
Figure 1~3B
Figure 4A~4B
Figure 5~6
AI summary
It is presented a method for obtaining data for an Electrocardiogram, ECG, using a portable sensor device comprising two electrodes. The method comprising the steps of: receiving a trigger to obtain measurements for the ECG; setting at least one switch in a conducting state to close a connection between the two electrodes; setting the at least one switch in a blocking state to conductively separate the two electrodes; and capturing measurements for the ECG using the at least two electrodes.