Wearable ECG Offset Correction for Contact Impedance Stability
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Solution Overview
Problem
The accuracy and reliability of electrocardiogram (ECG) measurements in wearable electronic devices are compromised due to varying contact impedance between electrodes and the body, influenced by factors such as skin characteristics, wearing posture, and environmental conditions, leading to unstable biometric signal acquisition.
Innovation Solution
A wearable electronic device equipped with a plurality of electrodes and an offset correction circuit, where a processor measures the offset between electrode voltages and adjusts them to fall within a threshold range, ensuring stable signal acquisition by compensating for changes in contact impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are placed to measure biometric signals, then measurement capability is provided, but contact impedance varies causing measurement instability
Solution Approach 1:
The system performs preliminary offset measurement and correction before actual ECG signal acquisition. By measuring the offset voltage between electrodes in advance and applying correction, the system prepares the measurement channel to eliminate impedance-related errors before they affect the primary measurement, ensuring both accuracy and stability.
Solution Approach 2:
The system continuously monitors the offset voltage between electrodes and feeds this information back to the offset correction circuit. This feedback mechanism allows real-time adjustment of the offset correction amount, compensating for changes in contact impedance that occur during wearing and measurement, thereby maintaining measurement reliability and precision.
2Measurement precision
If offset correction is applied to stabilize measurements, then measurement precision improves, but device complexity increases
Solution Approach 1:
The offset correction circuit is integrated with the existing ECG measurement circuitry, combining multiple functions into a unified system. The offset measurement and correction operations are merged with the primary signal acquisition pathway, allowing precision improvement without proportionally increasing overall device complexity.
Solution Approach 2:
The system uses the existing electrodes and measurement channels to perform offset measurement and correction automatically, without requiring separate dedicated components. The measurement system serves its own calibration needs by utilizing its existing infrastructure, thereby improving precision while minimizing additional complexity.
Data Source
AI summary
A wearable electronic device is provided. The electronic device includes a plurality of electrodes configured to measure a biometric signal, an offset correction circuit, at least one processor operatively connected with the plurality of electrodes and the offset correction circuit, and a memory operatively connected with the at least one processor, wherein the memory stores instructions executed to enable the at least one processor to measure an offset between voltages via at least two electrodes among the plurality of electrodes and correct the offset via the offset correction circuit to allow the measured offset to fall within a threshold range.