Wearable ECG Electrode Pairing for Signal Noise Reduction
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Solution Overview
Problem
Ambulatory wearable defibrillators face challenges in obtaining a clean ECG signal due to noise and electrode fall-off, leading to false arrhythmia detections and unnecessary shocks, as existing systems with dual-channel configurations are not always effective in eliminating noise and ensuring accurate cardiac monitoring.
Innovation Solution
A wearable medical device with multiple ECG sensing electrodes disposed at different axial positions, allowing for the selection of optimal pairings based on signal quality, phase difference, electrode position, and cardiac cycle to improve signal quality and reduce noise and false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual-channel configuration with four ECG sensing electrodes is used, then redundancy and operational flexibility are improved, but signal quality and noise resistance remain insufficient
Solution Approach 1:
The patent divides the electrode system into multiple independent sensing electrodes (at least five electrodes including a reference electrode) that can be selectively paired to form multiple channels. This segmentation allows the system to create numerous unique channel configurations from a limited set of electrodes, providing both redundancy and flexibility while maintaining signal quality through selective electrode pairing based on patient-specific factors.
2Measurement precision
If electrodes are positioned to maximize signal pickup, then detection sensitivity is improved, but susceptibility to electrode fall-off and noise increases
Solution Approach 1:
The patent applies different positioning strategies to different electrodes based on their specific functions. The reference electrode is positioned to minimize noise and interference, while other sensing electrodes are positioned to maximize ECG signal pickup. This localized optimization of electrode placement for specific functional requirements allows the system to achieve high detection sensitivity while maintaining noise resistance and electrode contact stability.
Solution Approach 2:
The reference electrode serves as an intermediary element that provides a stable, low-noise baseline for comparing signals from other sensing electrodes. By using the reference electrode as a mediator, the system can identify and filter out noise and interference from the sensing electrodes, thereby reducing false arrhythmia detections while maintaining high detection sensitivity for genuine cardiac abnormalities.
3Reliability
If multiple electrode pairings are created to improve signal quality, then noise resistance is improved, but device complexity increases
Solution Approach 1:
The patent makes the electrode system universal by designing it so that the same set of at least five sensing electrodes can be paired in multiple different configurations to create multiple channels. This multi-functionality allows a single electrode set to serve multiple purposes and provide multiple signal pathways, improving noise resistance through diversity while avoiding the complexity of having separate dedicated electrodes for each channel.
4Device complexity
If a fixed dual-channel system is used, then device simplicity is maintained, but adaptability to different patients and conditions is reduced
Solution Approach 1:
The patent introduces dynamic reconfigurability to the electrode system, allowing the number and configuration of active channels to be adjusted based on real-time signal quality assessment and patient-specific factors. The system can dynamically select optimal electrode pairings from the available electrodes, providing adaptability to different patients and conditions while maintaining relative simplicity through software-based configuration rather than hardware complexity.
Data Source
AI summary
A wearable arrhythmia monitoring and treatment device for improving confidence in determined arrhythmias prior to treatment includes a plurality of sensing electrodes, one or more therapy electrodes, and an electrode signal acquisition circuit having a plurality of inputs. The electrode signal acquisition circuit is configured to sense a respective signal provided by each of a plurality of different pairings of the plurality of sensing electrodes. The wearable arrhythmia monitoring and treatment device includes a monitoring and detection circuit including at least one processor configured to analyze the respective signals provided by each of the plurality of different pairings of the plurality of sensing electrodes, change a confidence level in a determined arrhythmia condition based on the respective signals provided by the plurality of different pairings of the plurality of sensing electrodes, and initiate a therapy to the patient via the one or more therapy electrodes based on the confidence level.